CN101969261B - High-power density permanent magnet motor - Google Patents

Abstract

The invention relates to a high-power density permanent magnet motor belonging to the field of motors. The invention solves the problems of low efficiency and thrust density, large thrust fluctuation and high vibration and noises of the traditional double-edge ironless straight line permanent magnet synchronous motor, which are caused by low air gap magnetic density and poor sine degree of air gap magnetic density wave forms. An air gap is positioned between a primary pole and a secondary pole of a straight line motor; main permanent magnets and isolated magnets are sequentially arranged on the inner wall of a yoke plate at intervals; the inner sides of the main permanent magnets are provided with assembling magnets which have same widths along a motion direction; the inner sides of the isolated magnets are provided with auxiliary permanent magnets which have same widths along the motion direction; the outer side surfaces of m auxiliary permanent magnets and m assembling magnets are positioned on a same plane; the main permanent magnets are parallelly magnetized in magnetizing directions perpendicular to the motion directions of active cells, and every two adjacent main permanent magnets are in reverse magnetizing directions; the auxiliary permanent magnets are parallelly magnetized in the magnetizing directions parallel to the motion directions of the active cells, and every two adjacent auxiliary permanent magnets are in reverse magnetizing directions.

Description

High power density permanent magnet motor

Technical field

The present invention relates to high power density permanent magnet motor, belong to machine field.

Background technology

Shown in Figure 6 is the structural representation of traditional bilateral no core construction linear permanent magnet synchronous motor.The secondary of this motor is made up of yoke plate and plate shaped permanent magnet; Permanent magnet edge and direction of motion vertical direction parallel magnetization; Permanent magnet is fixed on secondary yoke plate inboard along direction of motion N, alternate being arranged in order of S; The magnetizing direction of secondary bilateral corresponding permanent magnet is identical, and is elementary between two secondary plates.The normal component of the permanent magnet generation magnetic line of force vertically passes elementary, and the elementary winding of energising and secondary permanent magnet magnetic field interactions produce electromagnetic force, promote the mover moving linearly.

But there is following shortcoming in these linear electric motors: air gap flux density is low, and the sinusoidal degree of air gap flux density waveform is poor, so efficiency of motor and pushing force density is low, force oscillation is big, and the vibration of motor and noise are high.Simultaneously, secondary permanent magnet consumption is big, and secondary weight and motor cost are high.

Summary of the invention

The present invention seeks in order to solve traditional bilateral no core construction linear permanent magnet synchronous motor air gap flux density low; The sinusoidal degree of air gap flux density waveform is poor; Therefore efficiency of motor and pushing force density is low, force oscillation is big; Therefore the problem that the vibration of motor and noise are high, the invention provides a kind of high power density permanent magnet motor.

The invention provides the high power density permanent magnet motor of five kinds of structures, first kind of structure is the plate shaped linear permanent-magnet motor of single-side structural:

It comprises primary and secondary; Air gap is arranged between the primary and secondary; The secondary yoke plate, m piece of comprising is at a distance from magnet, m piece auxiliary permanent magnet, m piece master's permanent magnet and m piece gathering magnet, and yoke plate is plate shaped, yoke plate be arranged at intervals with main permanent magnet successively on the elementary direction inwall and at a distance from magnet; The inboard of main permanent magnet is provided with gathering magnet, and gathering magnet is identical along direction of motion width with main permanent magnet; Inboard at a distance from magnet is provided with auxiliary permanent magnet, and is identical along direction of motion width with auxiliary permanent magnet at a distance from magnet; The outer surface of auxiliary permanent magnet of m piece and m piece gathering magnet is in same plane, and main permanent magnet parallel magnetization, magnetizing direction are perpendicular to the mover direction of motion, and every adjacent two main permanent magnet magnetizing directions are opposite; Auxiliary permanent magnet parallel magnetization, magnetizing direction is parallel to the mover direction of motion, and every adjacent two auxiliary permanent magnet magnetizing directions are opposite.

Second kind of structure is the plate shaped linear permanent-magnet motor of bilateral structure:

It comprises elementary and two secondary; Elementary and each air gap is all arranged between secondary; Each secondary yoke plate, m piece of comprising is at a distance from magnet, m piece auxiliary permanent magnet, m piece master's permanent magnet and m piece gathering magnet, and yoke plate is plate shaped, on the madial wall of yoke plate, is arranged at intervals with main permanent magnet and separated magnet successively; The inboard of main permanent magnet is provided with gathering magnet, and gathering magnet is identical along direction of motion width with main permanent magnet; Inboard at a distance from magnet is provided with auxiliary permanent magnet, and is identical along direction of motion width with auxiliary permanent magnet at a distance from magnet; The outer surface of auxiliary permanent magnet of m piece and m piece gathering magnet is in same plane, and main permanent magnet parallel magnetization, magnetizing direction are perpendicular to the mover direction of motion, and every adjacent two main permanent magnet magnetizing directions are opposite; Auxiliary permanent magnet parallel magnetization, magnetizing direction is parallel to the mover direction of motion, and every adjacent two auxiliary permanent magnet magnetizing directions are opposite; The magnetizing direction of the main permanent magnet of two secondary same positions is identical, and the auxiliary permanent magnet magnetizing direction of two secondary same positions is opposite.

The third structure is the cylindrical permanent-magnet motor of outer-rotor structure:

It comprises stator and rotor; Rotor is positioned at the stator outside, between stator and the rotor air gap is arranged, and rotor comprises that yoke tube, m piece are at a distance from magnet, m piece auxiliary permanent magnet, m piece master's permanent magnet and m piece gathering magnet; The yoke tube is a cylindrical shape; Internal circular surfaces at the yoke tube is arranged at intervals with main permanent magnet and separated magnet successively, and the inboard of main permanent magnet is provided with gathering magnet, and along the circumferential direction angle is identical with main permanent magnet for gathering magnet; Inboard at a distance from magnet is provided with auxiliary permanent magnet, and along the circumferential direction width is identical with auxiliary permanent magnet at a distance from magnet; The inner surface of auxiliary permanent magnet of m piece and m piece gathering magnet is on the same circumference, and main permanent magnet radial magnetizing or radial parallel magnetize, and every adjacent two main permanent magnet magnetizing directions are opposite; Auxiliary permanent magnet cutting orientation magnetizing, every adjacent two auxiliary permanent magnet magnetizing directions are opposite.

The 4th kind of structure is the cylindrical permanent-magnet motor of inner rotor core:

It comprises stator and rotor; Rotor is positioned at stator interior, between stator and the rotor air gap is arranged, and rotor comprises that yoke tube, m piece are at a distance from magnet, m piece auxiliary permanent magnet, m piece master's permanent magnet and m piece gathering magnet; The yoke tube is a cylindrical shape; Outer round surface at the yoke tube is arranged at intervals with main permanent magnet and separated magnet successively, the arranged outside gathering magnet of main permanent magnet, and along the circumferential direction angle is identical with main permanent magnet for gathering magnet; Arranged outside at a distance from magnet is assisted permanent magnet, and along the circumferential direction width is identical with auxiliary permanent magnet at a distance from magnet; The outer surface of auxiliary permanent magnet of m piece and m piece gathering magnet is on same circumference, and main permanent magnet radial magnetizing or radial parallel magnetize, and every adjacent two main permanent magnet magnetizing directions are opposite; Auxiliary permanent magnet cutting orientation magnetizing, every adjacent two auxiliary permanent magnet magnetizing directions are opposite.

The 5th kind of structure is that inner rotor core and rotor outer surface are corrugated cylindrical permanent-magnet motor:

It comprises stator and rotor; Rotor is positioned at stator interior, between stator and the rotor air gap is arranged, and rotor comprises that yoke tube, m piece are at a distance from magnet, m piece auxiliary permanent magnet, m piece master's permanent magnet and m piece gathering magnet; The yoke tube is a cylindrical shape; Outer round surface at the yoke tube is arranged at intervals with main permanent magnet and separated magnet successively, the arranged outside gathering magnet of main permanent magnet, and along the circumferential direction angle is identical with main permanent magnet for gathering magnet; Arranged outside at a distance from magnet is assisted permanent magnet, and along the circumferential direction width is identical with auxiliary permanent magnet at a distance from magnet; The lateral surface of gathering magnet is an arc, the continuous and undulate of outer surface of auxiliary permanent magnet of m piece and m piece gathering magnet, and main permanent magnet radial magnetizing or radial parallel magnetize, and every adjacent two main permanent magnet magnetizing directions are opposite; Auxiliary permanent magnet cutting orientation magnetizing, every adjacent two auxiliary permanent magnet magnetizing directions are opposite.

Advantage of the present invention: Air-gap Flux Density in Permanent Magnet Machines of the present invention is high, the sinusoidal degree electromagnetic push good, motor of air-gap field is big, force oscillation is little, and cost is low.

Description of drawings

Fig. 1 is the structural representation of the plate shaped linear permanent-magnet motor of execution mode one said single-side structural;

Fig. 2 is the structural representation of the plate shaped linear permanent-magnet motor of execution mode two said bilateral structures;

Fig. 3 is the structural representation of the cylindrical permanent-magnet motor of execution mode three said outer-rotor structures;

Fig. 4 is the structural representation of the cylindrical permanent-magnet motor of execution mode four said inner rotor cores;

Fig. 5 is that execution mode five described inner rotor cores and rotor outer surface are the structural representation of corrugated cylindrical permanent-magnet motor;

Fig. 6 is the structural representation of bilateral no core construction linear permanent magnet synchronous motor traditional in the background technology.

Embodiment

Embodiment one: this execution mode is described below in conjunction with Fig. 1; This execution mode high power density permanent magnet motor; It is the plate shaped linear permanent-magnet motor of single-side structural: it comprises primary and secondary, and air gap is arranged between the primary and secondary, andsecondary yoke plate 1, the m piece of comprising is at a distance frommagnet 2, m piece auxiliarypermanent magnet 3, m piece masterpermanent magnet 4 and mpiece gathering magnet 5;Yoke plate 1 is plate shaped;Yoke plate 1 be arranged at intervals with mainpermanent magnet 4 on the elementary direction inwall successively and at a distance frommagnet 2, the inboard of mainpermanent magnet 4 is provided withgathering magnet 5, gatheringmagnet 5 is identical along direction of motion width with mainpermanent magnet 4; Auxiliarypermanent magnet 3 is set in the inboard at a distance frommagnet 2, identical along direction of motion width at a distance frommagnet 2 with auxiliarypermanent magnet 3; The outer surface of auxiliarypermanent magnet 3 of m piece and m piece gatheringmagnet 5 is in same plane, and mainpermanent magnet 4 parallel magnetizations, magnetizing direction are perpendicular to the mover direction of motion, and every adjacent two mainpermanent magnet 4 magnetizing directions are opposite; Auxiliarypermanent magnet 3 parallel magnetizations, magnetizing direction is parallel to the mover direction of motion, and every adjacent two auxiliarypermanent magnet 3 magnetizing directions are opposite.

Gatheringmagnet 5 adopts high saturation magnetic induction magnetic material, adopts nonmagnetic substance at a distance frommagnet 2.

Thickness at a distance frommagnet 2 is mainpermanent magnet 4 and 0%～50% of gatheringmagnet 5 thickness sums, and auxiliarypermanent magnet 3 thickness are mainpermanent magnet 4 and 20%～90% ofgathering magnet 5 thickness sums.

The saturation magnetic induction ofgathering magnet 5 is higher than the saturation magnetic induction of mainpermanent magnet 4, and the remanent magnetism of mainpermanent magnet 4 is higher than the remanent magnetism of auxiliarypermanent magnet 3, and the coercive force of auxiliarypermanent magnet 3 is higher than the coercive force of mainpermanent magnet 4.

Embodiment two: below in conjunction with Fig. 2 this execution mode is described, this execution mode high power density permanent magnet motor, it is the plate shaped linear permanent-magnet motor of bilateral structure:

It comprises elementary and two secondary; Elementary and each air gap is all arranged between secondary; Eachsecondary yoke plate 1, m piece of comprising is at a distance frommagnet 2, m piece auxiliarypermanent magnet 3, m piece masterpermanent magnet 4 and mpiece gathering magnet 5, andyoke plate 1 is plate shaped, on the madial wall ofyoke plate 1, is arranged at intervals with mainpermanent magnet 4 and separatedmagnet 2 successively; The inboard of mainpermanent magnet 4 is provided with gatheringmagnet 5, and gatheringmagnet 5 is identical along direction of motion width with mainpermanent magnet 4; Auxiliarypermanent magnet 3 is set in the inboard at a distance frommagnet 2, identical along direction of motion width at a distance frommagnet 2 with auxiliarypermanent magnet 3; The outer surface of auxiliarypermanent magnet 3 of m piece and mpiece gathering magnet 5 is in same plane, and mainpermanent magnet 4 parallel magnetizations, magnetizing direction are perpendicular to the mover direction of motion, and every adjacent two mainpermanent magnet 4 magnetizing directions are opposite; Auxiliarypermanent magnet 3 parallel magnetizations, magnetizing direction is parallel to the mover direction of motion, and every adjacent two auxiliarypermanent magnet 3 magnetizing directions are opposite; The magnetizing direction of the mainpermanent magnet 4 of two secondary same positions is identical, and auxiliarypermanent magnet 3 magnetizing directions of two secondary same positions are opposite.

Gatheringmagnet 5 adopts high saturation magnetic induction magnetic material, adopts nonmagnetic substance at a distance frommagnet 2.

Thickness at a distance frommagnet 2 is mainpermanent magnet 4 and 0%～50% of gatheringmagnet 5 thickness sums, and auxiliarypermanent magnet 3 thickness are mainpermanent magnet 4 and 20%～90% ofgathering magnet 5 thickness sums.

The saturation magnetic induction ofgathering magnet 5 is higher than the saturation magnetic induction of mainpermanent magnet 4, and the remanent magnetism of mainpermanent magnet 4 is higher than the remanent magnetism of auxiliarypermanent magnet 3, and the coercive force of auxiliarypermanent magnet 3 is higher than the coercive force of mainpermanent magnet 4.

Embodiment three: below in conjunction with Fig. 3 this execution mode is described, this execution mode high power density permanent magnet motor, it is the cylindrical permanent-magnet motor of outer-rotor structure:

It comprises stator and rotor; Rotor is positioned at the stator outside, between stator and the rotor air gap is arranged, and rotor comprises thatyoke tube 6, m piece are at a distance frommagnet 2, m piece auxiliarypermanent magnet 3, m piece masterpermanent magnet 4 and m piece gatheringmagnet 5; Yoketube 6 is a cylindrical shape; Internal circular surfaces atyoke tube 6 is arranged at intervals with mainpermanent magnet 4 and separatedmagnet 2 successively, and the inboard of mainpermanent magnet 4 is provided with gatheringmagnet 5, and along the circumferential direction angle is identical with mainpermanent magnet 4 for gatheringmagnet 5; In the inboard at a distance frommagnet 2 auxiliarypermanent magnet 3 is set, along the circumferential direction width is identical with auxiliarypermanent magnet 3 at a distance frommagnet 2; The inner surface of auxiliarypermanent magnet 3 of m piece and m piece gatheringmagnet 5 is on the same circumference, and mainpermanent magnet 4 radial magnetizings or radial parallel magnetize, and every adjacent two mainpermanent magnet 4 magnetizing directions are opposite; Auxiliarypermanent magnet 3 cutting orientation magnetizings, every adjacent two auxiliarypermanent magnet 3 magnetizing directions are opposite.

Gatheringmagnet 5 adopts high saturation magnetic induction magnetic material, adopts nonmagnetic substance at a distance frommagnet 2.

Thickness at a distance frommagnet 2 is mainpermanent magnet 4 and 0%～50% of gatheringmagnet 5 thickness sums, and auxiliarypermanent magnet 3 thickness are mainpermanent magnet 4 and 20%～90% ofgathering magnet 5 thickness sums.

The saturation magnetic induction ofgathering magnet 5 is higher than the saturation magnetic induction of mainpermanent magnet 4, and the remanent magnetism of mainpermanent magnet 4 is higher than the remanent magnetism of auxiliarypermanent magnet 3, and the coercive force of auxiliarypermanent magnet 3 is higher than the coercive force of mainpermanent magnet 4.

Embodiment four: below in conjunction with Fig. 4 this execution mode is described, this execution mode high power density permanent magnet motor, it is the cylindrical permanent-magnet motor of inner rotor core:

It comprises stator and rotor; Rotor is positioned at stator interior, between stator and the rotor air gap is arranged, and rotor comprises thatyoke tube 6, m piece are at a distance frommagnet 2, m piece auxiliarypermanent magnet 3, m piece masterpermanent magnet 4 and m piece gatheringmagnet 5;Yoke tube 6 is a cylindrical shape; Outer round surface atyoke tube 6 is arranged at intervals with mainpermanent magnet 4 and separatedmagnet 2 successively, the arrangedoutside gathering magnet 5 of mainpermanent magnet 4, and along the circumferential direction angle is identical with mainpermanent magnet 4 for gatheringmagnet 5; Arranged outside at a distance frommagnet 2 is assistedpermanent magnet 3, and along the circumferential direction width is identical with auxiliarypermanent magnet 3 at a distance frommagnet 2; The outer surface of auxiliarypermanent magnet 3 of m piece and m piece gatheringmagnet 5 is on same circumference, and mainpermanent magnet 4 radial magnetizings or radial parallel magnetize, and every adjacent two mainpermanent magnet 4 magnetizing directions are opposite; Auxiliarypermanent magnet 3 cutting orientation magnetizings, every adjacent two auxiliarypermanent magnet 3 magnetizing directions are opposite.

Gatheringmagnet 5 adopts high saturation magnetic induction magnetic material, adopts nonmagnetic substance at a distance frommagnet 2.

Thickness at a distance frommagnet 2 is mainpermanent magnet 4 and 0%～50% of gatheringmagnet 5 thickness sums, and auxiliarypermanent magnet 3 thickness are mainpermanent magnet 4 and 20%～90% ofgathering magnet 5 thickness sums.

The saturation magnetic induction ofgathering magnet 5 is higher than the saturation magnetic induction of mainpermanent magnet 4, and the remanent magnetism of mainpermanent magnet 4 is higher than the remanent magnetism of auxiliarypermanent magnet 3, and the coercive force of auxiliarypermanent magnet 3 is higher than the coercive force of mainpermanent magnet 4.

Embodiment five: below in conjunction with Fig. 5 this execution mode is described, this execution mode high power density permanent magnet motor, it is that inner rotor core and rotor outer surface are corrugated cylindrical permanent-magnet motor:

It comprises stator and rotor; Rotor is positioned at stator interior, between stator and the rotor air gap is arranged, and rotor comprises thatyoke tube 6, m piece are at a distance frommagnet 2, m piece auxiliarypermanent magnet 3, m piece masterpermanent magnet 4 and m piece gatheringmagnet 5;Yoke tube 6 is a cylindrical shape; Outer round surface atyoke tube 6 is arranged at intervals with mainpermanent magnet 4 and separatedmagnet 2 successively, the arrangedoutside gathering magnet 5 of mainpermanent magnet 4, and along the circumferential direction angle is identical with mainpermanent magnet 4 for gatheringmagnet 5; Arranged outside at a distance frommagnet 2 is assistedpermanent magnet 3, and along the circumferential direction width is identical with auxiliarypermanent magnet 3 at a distance frommagnet 2; The lateral surface ofgathering magnet 5 is an arc, the continuous and undulate of outer surface of auxiliarypermanent magnet 3 of m piece and m piece gatheringmagnet 5, and mainpermanent magnet 4 radial magnetizings or radial parallel magnetize, and every adjacent two mainpermanent magnet 4 magnetizing directions are opposite; Auxiliarypermanent magnet 3 cutting orientation magnetizings, every adjacent two auxiliarypermanent magnet 3 magnetizing directions are opposite.

Gatheringmagnet 5 adopts high saturation magnetic induction magnetic material, adopts nonmagnetic substance at a distance frommagnet 2.

Thickness at a distance frommagnet 2 is mainpermanent magnet 4 and 0%～50% of gatheringmagnet 5 thickness sums, and auxiliarypermanent magnet 3 thickness are mainpermanent magnet 4 and 20%～90% ofgathering magnet 5 thickness sums.

The saturation magnetic induction ofgathering magnet 5 is higher than the saturation magnetic induction of mainpermanent magnet 4, and the remanent magnetism of mainpermanent magnet 4 is higher than the remanent magnetism of auxiliarypermanent magnet 3, and the coercive force of auxiliarypermanent magnet 3 is higher than the coercive force of mainpermanent magnet 4.

Claims (10)

1. high power density permanent magnet motor; It is the flat permanent magnet motor, and it comprises primary and secondary, and air gap is arranged between the primary and secondary; It is characterized in that; The secondary yoke plate (1), m piece of comprising is at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5), and yoke plate (1) is plate shaped, on elementary direction inwall, is arranged at intervals with main permanent magnet (4) and separated magnet (2) at yoke plate (1) successively; The inboard of main permanent magnet (4) is provided with gathering magnet (5), and gathering magnet (5) is identical along direction of motion width with main permanent magnet (4); Inboard at a distance from magnet (2) is provided with auxiliary permanent magnet (3), and is identical along direction of motion width with auxiliary permanent magnet (3) at a distance from magnet (2); The m piece assists the outer surface of permanent magnet (3) and m piece gathering magnet (5) to be in same plane, and main permanent magnet (4) parallel magnetization, magnetizing direction are perpendicular to the mover direction of motion, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) parallel magnetization, magnetizing direction is parallel to the mover direction of motion, and every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

2. high power density permanent magnet motor; It is bilateral shape flat permanent magnet motor, it comprise elementary and two secondary, elementary and each air gap is all arranged between secondary; It is characterized in that; Each secondary yoke plate (1), m piece of comprising is at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5), and yoke plate (1) is plate shaped, on the madial wall of yoke plate (1), is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively; The inboard of main permanent magnet (4) is provided with gathering magnet (5), and gathering magnet (5) is identical along direction of motion width with main permanent magnet (4); Inboard at a distance from magnet (2) is provided with auxiliary permanent magnet (3), and is identical along direction of motion width with auxiliary permanent magnet (3) at a distance from magnet (2); The m piece assists the outer surface of permanent magnet (3) and m piece gathering magnet (5) to be in same plane, and main permanent magnet (4) parallel magnetization, magnetizing direction are perpendicular to the mover direction of motion, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) parallel magnetization, magnetizing direction is parallel to the mover direction of motion, and every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite; The magnetizing direction of the main permanent magnet (4) of two secondary same positions is identical, and auxiliary permanent magnet (3) magnetizing direction of two secondary same positions is opposite.

3. high power density permanent magnet motor, it is the cylindrical permanent-magnet motor, it comprises stator and rotor; Rotor is positioned at the stator outside; Between stator and the rotor air gap is arranged, it is characterized in that, rotor comprises that yoke tube (6), m piece are at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5); Yoke tube (6) is a cylindrical shape; Internal circular surfaces at yoke tube (6) is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively, and the inboard of main permanent magnet (4) is provided with gathering magnet (5), and along the circumferential direction angle is identical with main permanent magnet (4) for gathering magnet (5); Inboard at a distance from magnet (2) is provided with auxiliary permanent magnet (3), and along the circumferential direction width is identical with auxiliary permanent magnet (3) at a distance from magnet (2); The m piece assists the inner surface of permanent magnet (3) and m piece gathering magnet (5) to be on the same circumference, main permanent magnet (4) radial magnetizing, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) cutting orientation magnetizing, every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

4. high power density permanent magnet motor, it is the cylindrical permanent-magnet motor, it comprises stator and rotor; Rotor is positioned at the stator outside; Between stator and the rotor air gap is arranged, it is characterized in that, rotor comprises that yoke tube (6), m piece are at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5); Yoke tube (6) is a cylindrical shape; Internal circular surfaces at yoke tube (6) is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively, and the inboard of main permanent magnet (4) is provided with gathering magnet (5), and along the circumferential direction angle is identical with main permanent magnet (4) for gathering magnet (5); Inboard at a distance from magnet (2) is provided with auxiliary permanent magnet (3), and along the circumferential direction width is identical with auxiliary permanent magnet (3) at a distance from magnet (2); The m piece assists the inner surface of permanent magnet (3) and m piece gathering magnet (5) to be on the same circumference, and main permanent magnet (4) radial parallel magnetizes, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) cutting orientation magnetizing, every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

5. high power density permanent magnet motor, it is the cylindrical permanent-magnet motor, it comprises stator and rotor; Rotor is positioned at stator interior; Between stator and the rotor air gap is arranged, it is characterized in that, rotor comprises that yoke tube (6), m piece are at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5); Yoke tube (6) is a cylindrical shape; Outer round surface at yoke tube (6) is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively, the arranged outside gathering magnet (5) of main permanent magnet (4), and along the circumferential direction angle is identical with main permanent magnet (4) for gathering magnet (5); Arranged outside at a distance from magnet (2) is assisted permanent magnet (3), and along the circumferential direction width is identical with auxiliary permanent magnet (3) at a distance from magnet (2); The m piece assists the outer surface of permanent magnet (3) and m piece gathering magnet (5) on same circumference, main permanent magnet (4) radial magnetizing, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) cutting orientation magnetizing, every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

6. high power density permanent magnet motor, it is the cylindrical permanent-magnet motor, it comprises stator and rotor; Rotor is positioned at stator interior; Between stator and the rotor air gap is arranged, it is characterized in that, rotor comprises that yoke tube (6), m piece are at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5); Yoke tube (6) is a cylindrical shape; Outer round surface at yoke tube (6) is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively, the arranged outside gathering magnet (5) of main permanent magnet (4), and along the circumferential direction angle is identical with main permanent magnet (4) for gathering magnet (5); Arranged outside at a distance from magnet (2) is assisted permanent magnet (3), and along the circumferential direction width is identical with auxiliary permanent magnet (3) at a distance from magnet (2); The m piece assists the outer surface of permanent magnet (3) and m piece gathering magnet (5) on same circumference, and main permanent magnet (4) radial parallel magnetizes, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) cutting orientation magnetizing, every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

7. high power density permanent magnet motor, it is the cylindrical permanent-magnet motor, it comprises stator and rotor; Rotor is positioned at stator interior; Between stator and the rotor air gap is arranged, it is characterized in that, rotor comprises that yoke tube (6), m piece are at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5); Yoke tube (6) is a cylindrical shape; Outer round surface at yoke tube (6) is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively, the arranged outside gathering magnet (5) of main permanent magnet (4), and along the circumferential direction angle is identical with main permanent magnet (4) for gathering magnet (5); Arranged outside at a distance from magnet (2) is assisted permanent magnet (3), and along the circumferential direction width is identical with auxiliary permanent magnet (3) at a distance from magnet (2); The lateral surface of gathering magnet (5) is an arc, and the m piece is assisted the continuous and undulate of the outer surface of permanent magnet (3) and m piece gathering magnet (5), main permanent magnet (4) radial magnetizing, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) cutting orientation magnetizing, every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

8. high power density permanent magnet motor, it is the cylindrical permanent-magnet motor, it comprises stator and rotor; Rotor is positioned at stator interior; Between stator and the rotor air gap is arranged, it is characterized in that, rotor comprises that yoke tube (6), m piece are at a distance from magnet (2), m piece auxiliary permanent magnet (3), m piece master permanent magnet (4) and m piece gathering magnet (5); Yoke tube (6) is a cylindrical shape; Outer round surface at yoke tube (6) is arranged at intervals with main permanent magnet (4) and separated magnet (2) successively, the arranged outside gathering magnet (5) of main permanent magnet (4), and along the circumferential direction angle is identical with main permanent magnet (4) for gathering magnet (5); Arranged outside at a distance from magnet (2) is assisted permanent magnet (3), and along the circumferential direction width is identical with auxiliary permanent magnet (3) at a distance from magnet (2); The lateral surface of gathering magnet (5) is an arc, and the m piece is assisted the continuous and undulate of the outer surface of permanent magnet (3) and m piece gathering magnet (5), and main permanent magnet (4) radial parallel magnetizes, and every adjacent two main permanent magnet (4) magnetizing directions are opposite; Auxiliary permanent magnet (3) cutting orientation magnetizing, every adjacent two auxiliary permanent magnet (3) magnetizing directions are opposite.

9. according to any described high power density permanent magnet motor of claim of claim 1 to 8, it is characterized in that gathering magnet (5) adopts high saturation magnetic induction magnetic material, adopt nonmagnetic substance at a distance from magnet (2).

10. according to any described high power density permanent magnet motor of claim of claim 1 to 8; It is characterized in that; The saturation magnetic induction of gathering magnet (5) is higher than the saturation magnetic induction of main permanent magnet (4); The remanent magnetism of main permanent magnet (4) is higher than the remanent magnetism of auxiliary permanent magnet (3), and the coercive force of auxiliary permanent magnet (3) is higher than the coercive force of main permanent magnet (4).

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