CN111049320A - Single-phase permanent magnet motor - Google Patents

Abstract

The invention discloses a single-phase permanent magnet motor, comprising: the motor comprises a motor shell, a rotor, a motor shaft and a stator; the rotor is mounted to the motor shaft and rotates relative to the stator; the stator is fixed to the motor housing; the rotor comprises a rotor iron core and a permanent magnet; the permanent magnet is fixed to the rotor core; the stator comprises a stator iron core and a stator coil; the stator coil is wound to the stator core; the stator core includes: a connecting arm and two long arms; one end of the long arm is provided with a polar claw; two ends of the connecting arm are respectively connected with the other ends of the two long arms; the rotor is positioned between the two pole claws; the stator core is provided with a cooling channel for cooling liquid to flow through to cool the stator core; the cooling passage includes: two longitudinal channels formed by the two long arms and a transverse channel formed by the connecting arm; the transverse channel is communicated with the two longitudinal channels; the longitudinal channel extends in a direction parallel to the extension direction of the long arm; the transverse channel extends parallel to the extension of the connecting arm. The invention has the beneficial effect of good heat dissipation effect.

Description

Single-phase permanent magnet motor

Technical Field

The invention relates to a single-phase permanent magnet motor.

Background

A single-phase permanent magnet motor is a kind of single-phase motor. A single-phase permanent magnet motor is generally composed of a stator core, a stator winding, and a permanent magnet rotor. The stator magnetic core is a U-shaped iron core, a pair of pole arms are formed, and a pair of magnetic poles are formed at the tail ends of the pole arms; the stator winding is wound on the pole arm; the permanent magnet rotor is rotatably arranged between the magnetic poles of the iron core.

After the motor runs for a long time, the temperature rises, and the heat dissipation is not timely performed, so that the aging is accelerated, the service life is shortened, and even the damage is caused.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides the single-phase motor which has a good heat dissipation effect and can dissipate heat in time to cool the motor.

In order to achieve the above object, the present invention adopts the following technical solutions:

a single phase electric motor comprising: the motor comprises a motor shell, a rotor, a motor shaft and a stator; the rotor is mounted to the motor shaft and rotates relative to the stator; the stator is fixed to the motor housing; the rotor comprises a rotor iron core and a permanent magnet; the permanent magnet is fixed to the rotor core; the stator comprises a stator iron core and a stator coil; the stator coil is wound to the stator core; the stator core includes: a connecting arm and two long arms; one end of the long arm is provided with a polar claw; two ends of the connecting arm are respectively connected with the other ends of the two long arms; the rotor is positioned between the two pole claws;

a hollow hole is formed on the motor shell; the hollow hole penetrates through the motor shell along the direction parallel to the rotating axis of the rotor; the hollow hole is positioned between the two long arms;

a single phase electric motor further comprising: the heat dissipation device comprises a gear box body, a first gear, a second gear, an output shaft and a heat dissipation fan; the gear box body is fixed to the motor shell; the first gear and the second gear are arranged in the gear box body; the first gear is meshed with the second gear; the second gear and the heat radiation fan are mounted to the output shaft; the motor shaft drives the first gear to rotate and drives the cooling fan to rotate through the second gear and the output shaft; the rotation axis of the heat radiation fan is positioned in the hollow hole.

Further, the heat radiation fan is located between the gear box body and the motor housing.

Further, the heat radiation fan is a centrifugal fan; the gear box body and the motor shell jointly form a containing area for containing the radiating fan; the receiving area is open in at least two directions in a circumferential direction of a rotational axis of the heat dissipation fan.

Further, the accommodation region is open in three directions in the circumferential direction of the rotational axis of the heat dissipation fan.

Further, the number of stator coils is 2; two stator coils are wound on the two long arms, respectively.

Further, the motor housing includes an inner ring housing; the inner ring shell is a hollow structure to form a hollow hole.

Further, the motor housing further includes: the upper end cover, the lower end cover and the outer ring shell; the upper end cover and the lower end cover are respectively fixed to two ends of the outer ring shell; the outer annular shell surrounds the inner annular shell.

Further, two ends of the inner ring shell are respectively fixed to the upper end cover and the lower end cover.

Further, the motor shaft is a hollow shaft; a heat radiation oil path through which lubricating oil flows to radiate the rotor is formed in the middle of the motor shaft; the motor shaft is inserted into the gear box body; lubricating oil enters the gear box body from the heat dissipation oil path to lubricate the first gear and the second gear; the gear box body is formed with an oil return hole from which lubricating oil flows out.

Further, the first gear is fixed to one end of the motor shaft.

A single phase permanent magnet electric machine comprising: the motor comprises a motor shell, a rotor, a motor shaft and a stator; the rotor is mounted to the motor shaft and rotates relative to the stator; the stator is fixed to the motor housing; the rotor comprises a rotor iron core and a permanent magnet; the permanent magnet is fixed to the rotor core; the stator comprises a stator iron core and a stator coil; the stator coil is wound to the stator core; the stator core includes: a connecting arm and two long arms; one end of the long arm is provided with a polar claw; two ends of the connecting arm are respectively connected with the other ends of the two long arms; the rotor is positioned between the two pole claws;

the stator core is provided with a cooling channel for cooling liquid to flow through to cool the stator core; the cooling passage includes: two longitudinal channels formed by the two long arms and a transverse channel formed by the connecting arm; the transverse channel is communicated with the two longitudinal channels; the longitudinal channel extends in a direction parallel to the extension direction of the long arm; the transverse channel extends parallel to the extension of the connecting arm.

Further, the longitudinal channels extend in a direction perpendicular to the direction of extension of the transverse channels.

Furthermore, the single-phase permanent magnet motor also comprises a liquid supply pipeline for conveying cooling liquid into the cooling channel and a liquid outlet pipeline for discharging the cooling liquid in the cooling channel; the liquid supply pipeline and the liquid outlet pipeline penetrate through the motor shell and are respectively communicated to the two longitudinal channels.

Further, the motor shaft is a hollow shaft; and a heat radiation oil path for lubricating oil to flow through to radiate the rotor is formed in the middle of the motor shaft.

Further, a single phase motor further comprises: the gear box body, the first gear, the second gear and the output shaft; the gear box body is fixed to the motor shell; the first gear and the second gear are arranged in the gear box body; the first gear is meshed with the second gear; the second gear is mounted to the output shaft; the motor shaft drives the first gear to rotate so as to drive the output shaft to rotate.

Further, the motor shaft is inserted into the gear box body; lubricating oil enters the gear box body from the heat dissipation oil path to lubricate the first gear and the second gear; the gear box body is formed with an oil return hole from which lubricating oil flows out.

Further, the first gear is fixed to the motor shaft.

Further, the axis of rotation of the motor shaft is parallel to the axis of rotation of the output shaft.

Furthermore, both ends of the motor shaft extend out of the motor shell; the first gear is fixed to one end of the motor shaft; and the other end of the motor shaft is provided with a rotary joint for supplying oil to the heat-radiating oil circuit.

Further, the rotary joint and the gear box body are located on two sides of the motor housing.

The invention has the beneficial effect that the heat dissipation effect of the motor is good.

The rotor and the stator can be effectively cooled.

Drawings

FIG. 1 is a schematic view of a single phase motor of the present invention;

FIG. 2 is a right side view of the single phase motor of FIG. 1 with the rotary joint removed;

fig. 3 is a schematic view of a rotor and a stator of the single-phase motor of fig. 1.

The single-phase motor comprises a single-phase motor 100, amotor shell 10, anupper end cover 11, alower end cover 12, anouter ring shell 13, a hollowedhole 141, arotor 20, amotor shaft 30, astator 40, astator core 41, acooling channel 41a, a connectingarm 411, a transverse channel 411a, along arm 412, alongitudinal channel 412a, apole claw 4121, astator coil 42, agear box body 51, anoil return hole 511, afirst gear 52, asecond gear 53, anoutput shaft 54, acooling fan 55, anaccommodating area 55a, a rotary joint 60, aliquid supply pipeline 71 and aliquid outlet pipeline 72.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

As shown in fig. 1 to 3, a single-phase motor 100 includes: amotor housing 10, arotor 20, amotor shaft 30, and astator 40. Specifically, the single-phase motor 100 is a single-phase permanent magnet motor.

Therotor 20 is mounted to themotor shaft 30 and rotates relative to thestator 40. Thestator 40 is fixed to themotor housing 10. Therotor 20 includes a rotor core and permanent magnets. Thus, single-phaseelectric machine 100 may also be referred to as a single-phase permanent magnet machine. The permanent magnet is fixed to the rotor core. Thestator 40 includes astator core 41 and astator coil 42. Thestator coil 42 is wound to thestator core 41.

Thestator core 41 includes: a connectingarm 411 and twolong arms 412. One end of thelong arm 412 is provided with aclaw 4121. The connectingarm 411 has both ends connected to the other ends of the twolong arms 412, respectively. Therotor 20 is located between the twopole pieces 4121. As a specific embodiment, the number of thestator coils 42 is 2. Twostator coils 42 are wound on the twolong arms 412, respectively.

As a preferred embodiment, themotor housing 10 is formed with a hollowedhole 141. Thehollow hole 141 penetrates themotor housing 10 in a direction parallel to the rotational axis of therotor 20. The hollow 141 is located between the twolong arms 412.

The single-phase motor 100 further includes: agear housing 51, afirst gear 52, asecond gear 53, anoutput shaft 54, and aheat radiation fan 55.

Thegear housing 51 is fixed to themotor housing 10. Thefirst gear 52 and thesecond gear 53 are provided in thegear housing 51. Thefirst gear 52 meshes with thesecond gear 53. Thesecond gear 53 and theheat radiation fan 55 are mounted to theoutput shaft 54. Thefirst gear 52 is fixed to themotor shaft 30. Themotor shaft 30 drives thefirst gear 52 to rotate and drives theoutput shaft 54 to rotate via thesecond gear 53. Theoutput shaft 54 outputs power outward. Theoutput shaft 54 rotates theradiator fan 55. One end of theoutput shaft 54 is used for power output of an external transmission system. Aheat radiation fan 55 is mounted to the other end of theoutput shaft 54. Thefirst gear 52 and thesecond gear 53 constitute a reduction gear.

The axis of rotation of themotor shaft 30 is parallel to the axis of rotation of theoutput shaft 54. It is convenient to arrange theradiator fan 55, and the installation structure is simplified by directly installing theradiator fan 55 to theoutput shaft 54.

The rotation axis of theheat dissipation fan 55 is located in thehollow hole 141. The rotation of theheat dissipation fan 55 drives the airflow through the hollow 141, thereby dissipating heat from the motor. The gap between the twolong arms 412 of thestator core 41 is fully utilized for heat dissipation of the motor, the heat dissipation area is increased, the motor is effectively cooled, and particularly, thestator 40 has a good heat dissipation effect.

As a specific embodiment, theheat radiation fan 55 is located between thegear housing 51 and themotor housing 10. Theheat radiation fan 55 is a centrifugal fan. Thegear housing 51 and themotor housing 10 together form a receivingarea 55a that receives theheat radiation fan 55. Theaccommodation area 55a is open in at least two directions in the circumferential direction of the rotational axis of theheat dissipation fan 55. The rotation axis of theheat dissipation fan 55 is located in thehollow hole 141. The air flow can rapidly pass through thehollow hole 141 and overflow to the open direction through theaccommodating area 55a, and the heat dissipation effect is good.

Specifically, theaccommodation area 55a is open in three directions in the circumferential direction of the rotational axis of theheat dissipation fan 55. A rectangular coordinate system is established with the X-axis and the Y-axis perpendicular to each other in a plane perpendicular to theheat dissipation fan 55. Theaccommodation area 55a is open in three directions of positive and negative directions of the X axis and negative directions of the Y axis. Themotor shaft 30 is located in the positive direction of the Y axis of theaccommodation area 55 a.

As a specific embodiment, themotor housing 10 includes an inner ring housing. The inner ring shell is a hollow structure to form ahollow hole 141. Specifically, themotor housing 10 further includes: anupper end cover 11, alower end cover 12 and anouter ring shell 13. The upper andlower caps 11 and 12 are fixed to both ends of theouter ring housing 13, respectively. An outerannular shell 13 surrounds the inner annular shell. The two ends of the inner ring shell are respectively fixed to anupper end cover 11 and alower end cover 12.

In a preferred embodiment, themotor shaft 30 is a hollow shaft. A heat-dissipating oil path through which lubricating oil flows to dissipate heat of therotor 20 is formed at the middle portion of themotor shaft 30. Themotor shaft 30 is inserted into thegear housing 51. The lubricating oil enters thegear housing 51 from the heat radiation oil path to lubricate thefirst gear 52 and thesecond gear 53. Thegear housing 51 is formed with anoil return hole 511 through which the lubricating oil flows out. The lubricant oil passing through themotor shaft 30 can effectively dissipate heat of therotor 20.

Both ends of themotor shaft 30 protrude outside themotor housing 10. Thefirst gear 52 is fixed to one end of themotor shaft 30. The other end of themotor shaft 30 is mounted with a rotary joint 60 for supplying oil into the heat-dissipating oil path. The rotary joint 60 can supply oil into the heat-dissipating oil path of themotor shaft 30 while themotor shaft 30 rotates. The rotary joint 60 and thegear housing 51 are located on both sides of themotor housing 10.

As a preferred embodiment, thestator core 41 is formed with acooling passage 41a through which a cooling liquid flows to cool thestator core 41. Thecooling passage 41a includes: twolongitudinal channels 412a formed by the twolong arms 412, respectively, and a transverse channel 411a formed by the connectingarm 411. The lateral passage 411a communicates with the twolongitudinal passages 412 a. Thelongitudinal channel 412a extends in parallel to the direction of extension of thelong arm 412. The transverse channel 411a extends in parallel to the extension of the connectingarm 411. Thelongitudinal passage 412a extends in a direction perpendicular to the direction in which the lateral passage 411a extends.

The single-phasepermanent magnet motor 100 further includes aliquid supply pipe 71 for supplying the cooling liquid into the coolingchannel 41a and aliquid outlet pipe 72 for discharging the cooling liquid in the coolingchannel 41 a. Theliquid supply pipe 71 and theliquid outlet pipe 72 are respectively connected to twolongitudinal passages 412a through themotor housing 10.

The coolant enters thecooling passage 41a from theliquid supply pipe 71 to cool thestator core 41, and is discharged from theliquid discharge pipe 72. The coolant directly passes through thestator core 41, which has a better cooling effect on thestator core 41 than a cooling channel provided on the motor housing.

Sealing plug rings are arranged between theliquid supply pipeline 71 and theliquid outlet pipeline 72 and themotor shell 10, so that a sealing effect is realized. An oil seal structure is arranged between themotor shaft 30 and theoutput shaft 54 and thegear box body 51, and sealing effect is achieved. Other sealing structures may also be used to effect the seal.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A single phase permanent magnet electric machine comprising: the motor comprises a motor shell, a rotor, a motor shaft and a stator; the rotor is mounted to the motor shaft and rotates relative to the stator; the stator is fixed to the motor housing; the rotor comprises a rotor iron core and a permanent magnet; the permanent magnet is fixed to the rotor core; the stator comprises a stator core and a stator coil; the stator coil is wound to the stator core; the stator core includes: a connecting arm and two long arms; one end of the long arm is provided with a polar claw; two ends of the connecting arm are respectively connected with the other ends of the two long arms; the rotor is positioned between the two polar claws;

the stator core is characterized in that a cooling channel for cooling liquid to flow through to cool the stator core is formed in the stator core; the cooling passage includes: two longitudinal channels formed by the two long arms respectively and a transverse channel formed by the connecting arm; the transverse channel is communicated with the two longitudinal channels; the longitudinal channel extends in a direction parallel to the extension direction of the long arm; the transverse channel extends in a direction parallel to the extension of the connecting arm.

2. A single phase permanent magnet electric machine according to claim 1,

the extending direction of the longitudinal channel is perpendicular to the extending direction of the transverse channel.

3. A single phase permanent magnet electric machine according to claim 1,

the single-phase permanent magnet motor also comprises a liquid supply pipeline for conveying cooling liquid into the cooling channel and a liquid outlet pipeline for discharging the cooling liquid in the cooling channel; the liquid supply pipeline and the liquid outlet pipeline penetrate through the motor shell and are respectively communicated to the two longitudinal channels.

4. A single phase permanent magnet electric machine according to claim 1,

the motor shaft is a hollow shaft; and a heat dissipation oil path through which lubricating oil flows to dissipate heat of the rotor is formed in the middle of the motor shaft.

5. A single phase permanent magnet electric machine according to claim 4,

the single-phase permanent magnet machine further comprises: the gear box body, the first gear, the second gear and the output shaft; the gear housing is fixed to the motor housing; the first gear and the second gear are arranged in the gear box body; the first gear is meshed with the second gear; the second gear is mounted to the output shaft; the motor shaft drives the first gear to rotate so as to drive the output shaft to rotate.

6. A single phase permanent magnet electric machine according to claim 5,

the motor shaft is inserted into the gear box body; lubricating oil enters the gear box body from the heat radiation oil path to lubricate the first gear and the second gear; and an oil return hole for lubricating oil to flow out is formed in the gear box body.

7. A single phase permanent magnet electric machine according to claim 5,

the first gear is fixed to the motor shaft.

8. A single phase permanent magnet electric machine according to claim 7,

the axis of rotation of the motor shaft is parallel to the axis of rotation of the output shaft.

9. A single phase permanent magnet electric machine according to claim 7,

both ends of the motor shaft extend out of the motor shell; a first gear fixed to one end of the motor shaft; and the other end of the motor shaft is provided with a rotary joint for supplying oil to the heat-radiating oil way.

10. A single phase permanent magnet electric machine according to claim 9,

the rotary joint and the gear box body are positioned on two sides of the motor shell.

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