Motor shaft end rotating permanent magnet angle sending deviceTechnical field
The invention belongs to motor fields, are more particularly to a kind of motor shaft end rotating permanent magnet angle sending device.
Background technique
Existing widely used driving system for brushless motor, is usually made of motor body, controller and inverter, electricityThe normal operation of machine needs the position of real-time detection rotor and carries out accurate commutation control, just can guarantee motor normally and efficientlyRate operation.
Existing common driving system for brushless motor, mostly uses following methods that brush is made: one, rotor installs radial magnetizingPermanent magnet, motor case install induction chip；Two, using including stator and the two-part rotary transformer of patent, pacify respectivelyOn motor case and machine shaft；Three, it is passed using detection counter electromotive force of motor, magnetic linkage or impulses injection etc. without position in kindThe control algolithm of sensor realizes the detection to rotor-position.
But using the permanent magnet of radial magnetizing, it is generally the case that the number of poles of permanent magnet is equal with motor pole number, works as electricityMachine number of poles increases, and permanent magnet is difficult to install, and when installation space is narrow, permanent magnet is difficult to install or casing induction chip detectsError is larger.
Rotor-position is detected using rotary transformer, it usually needs occupy the radial and axial space of more motor, rotateThe Distance Transmission that the input stimulus and output signal line of resolver stator need to grow falls demodulation controller very much.
Using the control algolithm without position sensor in kind, there is some problems, usual situation in reliability, fault-toleranceUnder, it is applicable in only for the motor of particular condition.
Summary of the invention
In order to solve said one or multiple technical problems, the present invention, which provides one kind and occupies little space, to be easily installed, detectsThe higher and more durable motor shaft end rotating permanent magnet angle sending device of precision.
Technical scheme is as follows:
Motor shaft end rotating permanent magnet angle sending device, including motor shaft, electric motor end cap, magnetic yoke, permanent magnet, induction coreThe female coaxial of piece, circuit board and antifreeze plate, the motor shaft and electric motor end cap is installed, between the motor shaft and electric motor end capEquipped with magnetic yoke, the end of the motor shaft is threaded through in magnetic yoke, and the curvature is threaded through in the inner hole of electric motor end cap, describedPincers are equipped with the permanent magnet of two pieces of different magnetizing directions in magnetic yoke, and pincers are equipped with antifreeze plate, the motor between two pieces of permanent magnetsPillar is equipped between end cap and circuit board, the both ends of the pillar are connect with electric motor end cap and circuit board respectively, the circuit boardIt is equipped with induction chip towards the one side of permanent magnet, the induction chip is oppositely arranged with permanent magnet and does not contact.
It has the advantage that: the present invention is occupied little space using induction chip detection detection rotor-position, is detected speedFastly；The magnetic induction intensity that induction chip receives is generated by permanent magnet and codetermines magnetic induction intensity by magnetic yoke and antifreeze plateDistribution characteristics, due to angle information by space magnetic field transmit, be consequently belonging to contactless transmission angle information, sending sideThe extreme operating conditions such as high/low temperature can't play directly to that generally can not bear high/low temperature induction chip or circuit element damagesThe effect for protecting induction chip, keeps device more durable.
In some embodiments, the permanent magnet is the permanent magnet of axial charging, and two pieces of permanent magnets are towards the inductionThe polarity of one end of chip is opposite.
It has the advantage that: permanent magnet of the invention is axial charging, when motor series increases, do not need to increase permanent magnetismBody is easily installed permanent magnet, guarantees the detection accuracy of induction chip.
In some embodiments, the end of motor shaft is equipped with flat mouth cylindrical body, and the inner sidewall of magnetic yoke is logical equipped with flat mouthHole, motor shaft ends with flat mouth cylindrical body installation magnetic yoke flat mouth through-hole in.
It has the advantage that: the end convenient for motor shaft is firmly threaded through in magnetic yoke.
In some embodiments, antifreeze plate is made of un-conducted magnetic material.
It has the advantage that: the antifreeze plate for not having magnetic conduction function can just play the role of every magnetic, it is non-magnetic by planningMagnetic circuit path guarantee maximum precise measurement angle.
In some embodiments, magnetic yoke is made of permeability magnetic material.
It has the advantage that: the magnetic yoke of permeability magnetic material support has the function of magnetic conduction, by planning that the magnetic circuit path of magnetic conduction is protectedDemonstrate,prove maximum precise measurement angle.
In some embodiments, permanent magnet is semicylinder shape, and the lateral wall of permanent magnet is equipped with fin semicylinder shape,The inner sidewall of magnetic yoke is equipped with groove semicylinder shape, and fin semicylinder shape is fastened in groove semicylinder shape.
It has the advantage that: by the way that fin semicylinder shape is fastened in groove semicylinder shape, make that it connects compared withIt is secured.
In some embodiments, permanent magnet is axially protruded in magnetic yoke, permanent magnet protrude from magnetic yoke distance be greater than everyThe thickness of magnetic sheet.
It has the advantage that: guarantee antifreeze plate two pieces of permanent magnets are completely isolated, by air every magnetic magnetic circuit pathPlanning guarantees maximum precise measurement angle.
In some embodiments, the center of induction chip, antifreeze plate and motor shaft is located in a straight line.
It has the advantage that: detection accuracy is higher.
In some embodiments, adhesive is filled in the space between motor shaft, magnetic yoke, permanent magnet and antifreeze plate.
It has the advantage that: playing the role of bonding, guarantee enough assembly intensity, while preventing from being oxidized.
In some embodiments, induction chip welds on circuit boards.
It has the advantage that: welded connecting is relatively firm, mounting process simplifies.
Detailed description of the invention
Fig. 1 is the assembling schematic diagram of the motor shaft end rotating permanent magnet angle sending device of an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the motor shaft end rotating permanent magnet angle sending device of an embodiment of the present invention；
Fig. 3 is the perspective view of the explosion of the motor shaft end rotating permanent magnet angle sending device of an embodiment of the present invention；
Fig. 4 is the structural representation of the magnetic yoke of the motor shaft end rotating permanent magnet angle sending device of an embodiment of the present inventionFigure.
The title of corresponding component represented by number in figure:
1. motor shaft, 2. magnetic yokes, 21. flat mouthfuls of through-holes, 22. grooves semicylinder shape, 3. electric motor end caps, 4. pillars, 5. are foreverMagnet, 51. fins semicylinder shape, 6. induction chips, 7. circuit boards, 8. screws, 9. antifreeze plates.
Specific embodiment
As shown in Figs 1-4, the present invention discloses a kind of 1 end rotating permanent magnet of motor shaft, 5 angle sending device, including motor shaft1, electric motor end cap 3, magnetic yoke 2, permanent magnet 5, induction chip 6, circuit board 7, antifreeze plate 9 and screw 8.Motor shaft 1 is threaded through electricityIn generator terminal lid 3.The installation of the female coaxial of motor shaft 1 and electric motor end cap 3.Magnetic yoke 2 is equipped between motor shaft 1 and electric motor end cap 3.ElectricityThe end of arbor 1 is threaded through in magnetic yoke 2.2 part of magnetic yoke is threaded through in the inner hole of electric motor end cap 3.Two pieces are embedded in magnetic yoke 2 notWith the permanent magnet 5 of magnetizing direction.Antifreeze plate 9 is embedded between two pieces of permanent magnets 5.Branch is equipped between electric motor end cap 3 and circuit board 7Column 4.Pillar 4 is vertically arranged with electric motor end cap 3 and circuit board 7 respectively.The both ends of pillar 4 respectively with electric motor end cap 3 and circuit board 7Connection.The end of pillar 4 is threadedly coupled with electric motor end cap 3, and pillar 4 and circuit board 7 are connected by screw 8, and screw 8 is screwed onto branchIn column 4, the one side of circuit board 7 towards two pieces of permanent magnets 5 is equipped with induction chip 6, induction chip 6 and permanent magnet 5 be oppositely arranged andIt does not contact, permanent magnet 5 is axial charging, and the polarity of two pieces of permanent magnets 5 towards one end of induction chip 6 is opposite.Two pieces of permanent magnets 5It is the pole N and the pole S respectively towards induction chip 6.
The present invention is occupied little space, detection speed is fast using the detection detection rotor-position of induction chip 6；Induction chip 6 connectsThe magnetic induction intensity received is generated by permanent magnet 5 and is codetermined by magnetic yoke 2 and antifreeze plate 9 distribution characteristics of magnetic induction intensity,Since angle information is transmitted by space magnetic field, it is consequently belonging to contactless transmission angle information, the poles such as high/low temperature of sending sideEnd operating condition can't be directly to generally can not bear high/low temperature induction chip or circuit element damages；Permanent magnet of the invention5 be axial charging, when motor series increases, does not need to increase permanent magnet 5, is easily installed permanent magnet 5, guarantee induction chip 6Detection accuracy.
In the present embodiment, before installation, in the surface coating stick of motor shaft 1, magnetic yoke 2, permanent magnet 5 and antifreeze plate 9.The end of motor shaft 1 is equipped with flat mouth cylindrical body, and the inner sidewall of magnetic yoke 2 is equipped with flat mouth through-hole, and 1 end of motor shaft is justified with flat mouthCylinder 11 is installed in the flat mouth through-hole 21 of magnetic yoke 2.It is firmly threaded through in magnetic yoke 2 convenient for the end of motor shaft 1.Antifreeze plate 9 byUn-conducted magnetic material is made.The antifreeze plate 9 for not having magnetic conduction function can just play the role of every magnetic, by planning non-magnetic magnetic circuitPath guarantees maximum precise measurement angle.Magnetic yoke 2 is made of permeability magnetic material.The magnetic yoke 2 of permeability magnetic material support has the function of magnetic conduction,By planning that the magnetic circuit path of magnetic conduction guarantees maximum precise measurement angle.Permanent magnet 5 is semicylinder shape, the outside of permanent magnet 5Wall is equipped with fin 51 semicylinder shape, and the inner sidewall of magnetic yoke 2 is equipped with groove 22 semicylinder shape, and the card of fin 51 semicylinder shape is setIn groove 22 semicylinder shape.By the way that fin 51 semicylinder shape to be fastened in groove 22 semicylinder shape, make its connectionIt is relatively firm.Permanent magnet 5 is axially protruded in magnetic yoke 2, and the distance that permanent magnet 5 protrudes from magnetic yoke 2 is greater than the thickness of antifreeze plate 9Degree.Guarantee that antifreeze plate 9 is completely isolated by two pieces of permanent magnets 5, planned by the magnetic circuit path to air every magnetic, is guaranteed maximum accurateMeasurement angle.The center of induction chip 6, antifreeze plate 9 and motor shaft 1 is located in a straight line.Detection accuracy is higher.Motor shaft 1,Adhesive is filled in space between magnetic yoke 2, permanent magnet 5 and antifreeze plate 9.Play the role of bonding, guarantees enough assemblyIntensity, while preventing from being oxidized.Induction chip 6 is welded on circuit board 7.It is welded to connect relatively firm, mounting process simplification.
Some embodiments of the present invention are elaborated above in conjunction with attached drawing, but the present invention is not limited to line number realitiesMode is applied, it within the knowledge of a person skilled in the art, can also be in the premise for not departing from present inventive conceptIt is lower that various changes can be made.