CN213602453U - Surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles - Google Patents
Surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles Download PDFInfo
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- CN213602453U CN213602453U CN202022527206.3U CN202022527206U CN213602453U CN 213602453 U CN213602453 U CN 213602453U CN 202022527206 U CN202022527206 U CN 202022527206U CN 213602453 U CN213602453 U CN 213602453U
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 48
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 88
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 88
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 78
- 238000004804 winding Methods 0.000 claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000725 suspension Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 abstract description 36
- 230000005347 demagnetization Effects 0.000 abstract description 19
- 230000004907 flux Effects 0.000 abstract description 14
- 229910052742 iron Inorganic materials 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000002427 irreversible effect Effects 0.000 description 4
- 238000005339 levitation Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention discloses a surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles, which comprises a rotor and a stator, wherein the rotor is arranged in the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot in the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, a built-in permanent magnet and a surface-mounted permanent magnet, and the built-in permanent magnet and the surface-mounted permanent magnet can adopt combined magnetic pole structures. The combined magnetic pole type surface-mounted built-in bearingless permanent magnet synchronous motor has the advantages that the structure is simple, the permanent magnet is easy to process, the distortion rate of the air gap flux density waveform is small, the air gap flux density waveform of the combined magnetic pole type surface-mounted built-in bearingless permanent magnet synchronous motor is more sinusoidal than that of a traditional surface-mounted built-in bearingless rare earth permanent magnet synchronous motor, and therefore the iron loss, the torque fluctuation and the suspension force fluctuation of a stator are reduced. And the strong anti-demagnetization capability of the ferrite material reduces the demagnetization risk when the motor runs, and improves the reliability of the motor.
Description
Technical Field
The invention relates to a combined magnetic pole type rotor structure, belonging to the field of a bearingless permanent magnet synchronous motor; in particular to a surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles.
Background
The bearingless permanent magnet synchronous motor utilizes the combined action of two sets of different pole pair windings (torque windings and suspension windings) in a stator slot to generate a magnetic field, the magnitude and the direction of a suspension force can be controlled by controlling the magnitude and the direction of a superposed synthetic magnetic field, and the bearingless permanent magnet synchronous motor has the advantages of no mechanical friction between a stator and a rotor of a magnetic bearing, no need of lubrication, low operation noise, long service life and the like, inherits the excellent characteristics of the permanent magnet synchronous motor, has a simple motor structure and reliable operation performance, and has wide application prospects in special fields of aerospace, life science, ultra-clean transmission, corrosive gas or liquid transmission and the like.
Although the traditional built-in permanent magnet rotor has a wide constant power operation range, the magnetic leakage is serious, and the mechanical strength of the rotor is low because the magnetic isolation bridge is very thin, the traditional surface permanent magnet rotor has no reluctance torque, is easily influenced by a stator armature magnetic field, is easy to cause demagnetization under a demagnetization magnetic field, and has low power density. The surface-built-in type permanent magnet rotor has the advantages that the permanent magnet motor with the rotor structure enhances the mechanical strength of the rotor, reduces magnetic leakage, omits a magnetic isolation bridge, improves the power density of the motor, and improves the starting, braking and operating performances of the bearingless permanent magnet synchronous motor.
For a bearing-free permanent magnet synchronous motor driven by a sine wave, the distribution of an air gap magnetic field generated by a permanent magnet material always contains harmonic components, and the harmonic magnetic fields can cause additional iron loss, torque fluctuation and suspension force fluctuation; and local irreversible demagnetization is easy to occur in the rare earth permanent magnet material during use, and particularly under the condition of high temperature, the irreversible demagnetization of the permanent magnet material can cause the performance of the motor to be reduced. The patent [ CN204559342U ] provides a segmentation PWM arranges sine wave disk motor, arranges into a plurality of sections and arranges the permanent magnet under every utmost point according to PWM arranges the principle to realize the sinusoidal of air gap flux density, be favorable to reducing the higher harmonic of motor air gap flux density, improve the sine degree of air gap flux density, but its permanent magnet quantity is great, and every permanent magnet width varies, and the processing degree of difficulty is great. Patent [ CN103138442A ] proposes a rotor for a built-in permanent magnet motor, where the rotor level adopts a special structure to achieve the goal of air gap flux density sine, but the processing difficulty of the permanent magnet is increased, the length of the air gap is uneven, and the power density of the motor is affected.
Disclosure of Invention
The invention aims to solve the problems that an air gap field of a bearing-free rare earth permanent magnet synchronous motor driven by a sine wave has harmonic waves and local irreversible demagnetization easily occurs, and particularly the problem that the performance of the motor is reduced due to the irreversible demagnetization of a permanent magnet material under the high-temperature condition, aiming at the defects of the traditional surface-mounted built-in bearing-free permanent magnet synchronous motor. On the premise of not influencing the output characteristic of the motor, the cost of the bearingless rare earth permanent magnet synchronous motor is reduced, the sine degree of an air gap field of the bearingless rare earth permanent magnet synchronous motor is improved, and the problem of high-temperature demagnetization is solved.
The invention adopts the following three technical schemes:
a surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot of the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, built-in permanent magnets and surface-mounted permanent magnets, wherein a plurality of V-shaped permanent magnet grooves are formed in the rotor structure body, the built-in permanent magnets are embedded into the permanent magnet grooves, each surface-mounted permanent magnet is provided with a surface facing the permanent magnet groove, the surface-mounted permanent magnets are fixed on the outer circumference of the rotor structure body, the surface polarities of the surface-mounted permanent magnets corresponding to the built-in permanent magnets are different, the surface-mounted permanent magnets are connected in series on a magnetic circuit, the surface-mounted permanent magnets are of a combined magnetic pole structure, the built-in permanent magnets are of a single magnetic pole structure, two left and right end faces of each surface-mounted permanent magnet rare earth permanent magnet magnetic pole are respectively provided with a ferrite permanent magnet pole, and the rare earth permanent magnet.
Preferably, the rare earth permanent magnetic pole and the two ferrite permanent magnetic poles are magnetized in parallel, and the magnetizing directions are the same.
Preferably, the built-in permanent magnet is a long-strip rare earth permanent magnet, the rare earth permanent magnets in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channel, and the magnetizing directions are the same.
A surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot of the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, a built-in permanent magnet and a surface-mounted permanent magnet, wherein a plurality of V-shaped permanent magnet grooves are formed in the rotor structure body, the built-in permanent magnets are embedded into the permanent magnet grooves, each surface-mounted permanent magnet is provided with a permanent magnet groove which is opposite to the surface-mounted permanent magnet, the surface-mounted permanent magnet is fixed on the outer circumference of the rotor structure body, the surface polarities of the surface-mounted permanent magnet and the surface-mounted permanent magnet corresponding to the built-in permanent magnet are different, the permanent magnet is connected in series on a magnetic circuit, the surface-mounted permanent magnet adopts a single magnetic pole structure, the built-in permanent magnet adopts a combined magnetic pole structure, the built-in permanent magnet magnetic pole comprises two rare earth permanent magnet magnetic poles and two ferrite permanent magnet magnetic poles, the two rare earth permanent magnet magnetic poles and the two ferrite permanent magnet magnetic poles are both in a strip shape, and one rare earth permanent magnet magnetic pole and one ferrite permanent magnet magnetic pole are embedded into each slope channel of the V-shaped permanent magnet mounting groove.
Preferably, the rare earth permanent magnet and the ferrite permanent magnet magnetic pole in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channel, and the magnetizing directions are the same.
Preferably, the surface-mounted permanent magnet is of an arc-shaped magnetic pole structure, and the magnetizing direction is parallel magnetizing.
A surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot of the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, a built-in permanent magnet and a surface-mounted permanent magnet, wherein a plurality of V-shaped permanent magnet grooves are formed in the rotor structure body, the built-in permanent magnets are embedded into the permanent magnet grooves, each surface-mounted permanent magnet is provided with a permanent magnet groove which is opposite to the surface-mounted permanent magnet, the surface-mounted permanent magnet is fixed on the outer circumference of the rotor structure body, the surface polarities of the surface-mounted permanent magnet and the surface-mounted permanent magnet corresponding to the built-in permanent magnet are different, the permanent magnet is connected in series on a magnetic circuit, the built-in permanent magnet and the surface-mounted permanent magnet are both provided with a plurality of magnetic poles, each magnetic pole of the built-in permanent magnet comprises two rare earth permanent magnet magnetic poles and two ferrite permanent magnet magnetic poles, the two rare earth permanent magnet magnetic poles and the two ferrite permanent magnet magnetic poles are both in a strip shape, and one rare earth permanent magnet magnetic pole and one ferrite permanent magnet magnetic pole are embedded in each slope channel of the V-shaped permanent magnet mounting groove; two left and right end faces of the surface-mounted permanent magnet rare earth permanent magnetic pole are respectively provided with a ferrite permanent magnetic pole, and the rare earth permanent magnetic pole and the two ferrite permanent magnetic poles form a continuous annular magnetic pole structure.
Preferably, the rare earth permanent magnetic pole and the two ferrite permanent magnetic poles are magnetized in parallel, and the magnetizing directions are the same.
Preferably, the rare earth permanent magnet and the ferrite permanent magnet magnetic pole in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channel, and the magnetizing directions are the same.
The invention has the beneficial effects that: the surface-mounted built-in type bearingless permanent magnet synchronous motor based on the combined magnetic pole has the advantages of simple structure, easy processing of the permanent magnet and small distortion rate of the air gap flux density waveform. In addition, the strong demagnetization resistance of the ferrite material reduces the demagnetization risk of the motor during operation, and improves the reliability of the motor.
Drawings
FIG. 1 is a schematic diagram of a conventional surface-mounted-built-in bearingless permanent magnet synchronous motor;
FIG. 2 is a schematic structural diagram of a combined-pole-based surface-mounted and built-in bearingless permanent magnet synchronous motor according to an embodiment;
FIG. 3 is a schematic structural diagram of a surface-mounted and internal bearingless permanent magnet synchronous motor based on combined magnetic poles according to the second embodiment;
FIG. 4 is a schematic structural diagram of a surface-mounted and internal bearingless permanent magnet synchronous motor based on combined magnetic poles according to the third embodiment;
FIG. 5 is a schematic view of a particular configuration of the combined rotor poles of the motor of the present invention;
fig. 6 is a comparison graph of air gap flux density waveforms of the surface-mounted-built-in bearingless permanent magnet synchronous motor based on combined magnetic poles and the conventional surface-mounted built-in bearingless rare earth permanent magnet synchronous motor.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1: as shown in fig. 2, 5 and 6, a surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, a radial air gap is reserved between the rotor and the stator, the stator comprises a stator core 1 and a stator winding, the stator winding is arranged in a stator slot inside the stator core and comprises a torque winding 2 and a suspension force winding 3, the rotor comprises a plurality of rotor magnetic poles and a rotor core 4, the outer circle surface of the rotor core 4 is uniformly provided with a plurality of rotor magnetic poles 5 in a surface-mounted manner, a layer of V-shaped permanent magnet mounting groove is uniformly distributed in the rotor core along the circumferential direction, the V-shaped permanent magnet mounting groove extends along the axial direction, a V-shaped opening faces the stator, a single magnetic pole 6 is arranged in each V-shaped permanent magnet mounting groove, each surface-mounted permanent magnet is provided with a surface, the surface-mounted permanent magnet and the built-in permanent magnet have different corresponding surface polarities and are connected in series on a magnetic circuit.
The rotor surface-mounted magnetic pole comprises a rare earth permanent magnetic pole 5-1 and two ferrite permanent magnetic poles 5-2, the left end face and the right end face of the rare earth permanent magnetic pole 5-1 are respectively provided with one ferrite permanent magnetic pole 5-2, the rare earth permanent magnetic pole 5-1 and the two ferrite permanent magnetic poles 5-2 form a continuous circular arc magnetic pole structure, the magnetizing directions of the rare earth permanent magnetic pole 5-1 and the two ferrite permanent magnetic poles 5-2 are parallel magnetizing, and the magnetizing directions are the same.
The V-shaped permanent magnet in the rotor is a single magnetic pole 6 and is a long-strip rare earth permanent magnet, the rare earth permanent magnets in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channel, and the magnetizing directions are the same.
The rotor surface is pasted with a combined magnetic pole of the permanent magnet, the arc length of the rare earth permanent magnetic pole is a, the arc length of the ferrite permanent magnetic pole is b/2, and the two meet the following conditions:
The sizes of the rare earth permanent magnetic pole 5-1 and the ferrite permanent magnetic pole 5-2 are reasonably proportioned according to the formula to generate an air gap magnetic field waveform with the best sine degree, so that the iron loss and the torque fluctuation are favorably reduced.
The ferrite permanent magnetic poles placed on the two sides of the rare earth permanent magnetic pole have strong demagnetization resistance, the coercive force of the ferrite permanent magnetic pole has a positive temperature coefficient, the demagnetization resistance can be further enhanced at high temperature, and the problem that the rare earth permanent magnetic material is easy to demagnetize at high temperature in practical application can be solved.
The idea of the embodiment is that aiming at the traditional surface-mounted built-in bearingless permanent magnet synchronous motor (as shown in figure 1), a ferrite permanent magnet material is used for replacing a part of rare earth permanent magnet material, and the ferrite is placed on two sides of the rare earth permanent magnet material. Because the remanence of the ferrite material is lower than that of the rare earth permanent magnet material, the air gap flux density waveform can be closer to a sine wave through combination, and the harmonic content of an air gap magnetic field is reduced, so that the stator iron loss, the torque fluctuation and the suspension force fluctuation caused by the magnetic field harmonic can be reduced. As can be seen from fig. 6, the air gap flux density waveform of the surface-mounted built-in bearingless permanent magnet synchronous motor based on the combined magnetic poles is more sinusoidal than that of the conventional surface-mounted built-in bearingless permanent magnet synchronous motor, so that the iron loss, the torque fluctuation and the levitation force fluctuation of the stator are reduced. In addition, the anti-demagnetization capability of the ferrite permanent magnet material is stronger than that of the rare earth permanent magnet material, the anti-demagnetization capability of the ferrite permanent magnet material is enhanced along with the rise of temperature, and the ferrite is placed on two sides of the rare earth permanent magnet material, so that the local demagnetization risk of the original rare earth permanent magnet material can be greatly reduced, and the running reliability of the motor is improved.
Example 2: as shown in fig. 3, 5 and 6, a surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, a radial air gap is reserved between the rotor and the stator, the stator comprises a stator core 1 and a stator winding, the stator winding is arranged in a stator slot inside the stator core and comprises a torque winding 2 and a suspension force winding 3, the rotor comprises a plurality of rotor magnetic poles and a rotor core 4, the outer circle surface of the rotor core 4 is uniformly provided with single magnetic poles 5 in a surface-mounted manner, a layer of V-shaped permanent magnet installation slot is uniformly distributed in the rotor core along the circumferential direction, the V-shaped permanent magnet installation slot extends along the axial direction, a V-shaped opening faces the stator, a combined magnetic pole 6 is arranged in each V-shaped permanent magnet installation slot, each surface-mounted permanent magnet is provided with a surface facing, the surface-mounted permanent magnet and the built-in permanent magnet have different corresponding surface polarities and are connected in series on a magnetic circuit.
The V-shaped permanent magnet in the rotor is a combined magnetic pole and comprises two rare earth permanent magnet magnetic poles 5-3 and two ferrite permanent magnet magnetic poles 5-4, the two rare earth permanent magnet magnetic poles 5-3 and the two ferrite permanent magnet magnetic poles 5-4 are strip-shaped, 1 rare earth permanent magnet magnetic pole and 1 ferrite permanent magnet magnetic pole are embedded into each slope channel of the V-shaped permanent magnet mounting groove, the rare earth permanent magnet and the ferrite permanent magnet magnetic poles in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channels, and the magnetizing directions are the same.
The rotor surface-mounted magnetic pole is a single magnetic pole 5 and has an arc magnetic pole structure, and the magnetizing direction is parallel magnetizing.
The built-in combined magnetic pole of rotor, in a slope passageway, the length of tombarthite permanent magnetism magnetic pole along the sloping direction is l/2, and the length of ferrite permanent magnetism magnetic pole along the sloping direction is m/2, the condition that the two satisfy:
in the formula: c is the pole pitch of the rotor magnetic pole; d is an included angle of two slope channels of the V-shaped permanent magnet mounting groove; br2Is the residual magnetic density, Br, of the rare earth permanent magnetic pole at the working temperature1The remanence density of the ferrite permanent magnetic pole at the working temperature; and satisfy Br2> Br1。
The sizes of the rare earth permanent magnetic pole 5-3 and the ferrite permanent magnetic pole 5-4 are reasonably proportioned according to the formula, so that an air gap magnetic field waveform with the best sine degree is generated, and the iron loss and the torque fluctuation are favorably reduced.
The ferrite permanent magnetic poles placed on the two sides of the rare earth permanent magnetic pole have strong demagnetization resistance, the coercive force of the ferrite permanent magnetic pole has a positive temperature coefficient, the demagnetization resistance can be further enhanced at high temperature, and the problem that the rare earth permanent magnetic material is easy to demagnetize at high temperature in practical application can be solved.
The conception of the embodiment is that aiming at the traditional surface-mounted built-in bearingless permanent magnet synchronous motor, a ferrite permanent magnet material is used for replacing a part of rare earth permanent magnet material, and the ferrite is placed on two sides of the rare earth permanent magnet material. Because the remanence of the ferrite material is lower than that of the rare earth permanent magnet material, the air gap flux density waveform can be closer to a sine wave through combination, and the harmonic content of an air gap magnetic field is reduced, so that the stator iron loss, the torque fluctuation and the suspension force fluctuation caused by the magnetic field harmonic can be reduced. As can be seen from fig. 6, the air gap flux density waveform of the surface-mounted built-in bearingless permanent magnet synchronous motor based on the combined magnetic poles is more sinusoidal than that of the conventional surface-mounted built-in bearingless permanent magnet synchronous motor, so that the iron loss, the torque fluctuation and the levitation force fluctuation of the stator are reduced. In addition, the anti-demagnetization capability of the ferrite permanent magnet material is stronger than that of the rare earth permanent magnet material, the anti-demagnetization capability of the ferrite permanent magnet material is enhanced along with the rise of temperature, and the ferrite is placed on two sides of the rare earth permanent magnet material, so that the local demagnetization risk of the original rare earth permanent magnet material can be greatly reduced, and the running reliability of the motor is improved.
Example 3: as shown in fig. 4, 5 and 6, a surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, a radial air gap is reserved between the rotor and the stator, the stator comprises a stator core 1 and a stator winding, the stator winding is arranged in a stator slot inside the stator core and comprises a torque winding 2 and a suspension force winding 3, the rotor comprises a plurality of rotor magnetic poles and a rotor core 4, the combined magnetic poles 5 are uniformly arranged on the surface of the excircle of the rotor core 4 in a surface-mounted manner, a layer of V-shaped permanent magnet installation groove is uniformly distributed in the rotor core along the circumferential direction, the V-shaped permanent magnet installation groove extends along the axial direction, a V-shaped opening faces the stator, the combined magnetic pole 6 is arranged in each V-shaped permanent magnet installation groove, each surface-mounted permanent magnet is provided with a, the surface-mounted permanent magnet and the built-in permanent magnet have different corresponding surface polarities and are connected in series on a magnetic circuit.
The rotor surface-mounted magnetic pole comprises a rare earth permanent magnetic pole 5-1 and two ferrite permanent magnetic poles 5-2, the left end face and the right end face of the rare earth permanent magnetic pole 5-1 are respectively provided with one ferrite permanent magnetic pole 5-2, the rare earth permanent magnetic pole 5-1 and the two ferrite permanent magnetic poles 5-2 form a continuous circular arc magnetic pole structure, the magnetizing directions of the rare earth permanent magnetic pole 5-1 and the two ferrite permanent magnetic poles 5-2 are parallel magnetizing, and the magnetizing directions are the same.
The V-shaped permanent magnet in the rotor is a combined magnetic pole and comprises two rare earth permanent magnet magnetic poles 5-3 and two ferrite permanent magnet magnetic poles 5-4, the two rare earth permanent magnet magnetic poles 5-3 and the two ferrite permanent magnet magnetic poles 5-4 are strip-shaped, 1 rare earth permanent magnet magnetic pole and 1 ferrite permanent magnet magnetic pole are embedded into each slope channel of the V-shaped permanent magnet mounting groove, the rare earth permanent magnet and the ferrite permanent magnet magnetic poles in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channels, and the magnetizing directions are the same.
The rotor surface is pasted with a combined magnetic pole of the permanent magnet, the arc length of the rare earth permanent magnetic pole is a, the arc length of the ferrite permanent magnetic pole is b/2, and the two meet the following conditions:
The combined magnetic pole of the permanent magnet is arranged in the rotor, in a slope channel, the length of the rare earth permanent magnetic pole along the slope direction is l/2, the length of the ferrite permanent magnetic pole along the slope direction is m/2, and the two satisfy the following conditions:
The sizes of the rare earth permanent magnetic pole and the ferrite permanent magnetic pole are reasonably proportioned according to the formula to generate an air gap magnetic field waveform with the best sine degree, so that the iron loss and the torque fluctuation are favorably reduced.
The ferrite permanent magnetic poles placed on the two sides of the rare earth permanent magnetic pole have strong demagnetization resistance, the coercive force of the ferrite permanent magnetic pole has a positive temperature coefficient, the demagnetization resistance can be further enhanced at high temperature, and the problem that the rare earth permanent magnetic material is easy to demagnetize at high temperature in practical application can be solved.
The conception of the embodiment is that aiming at the traditional surface-mounted built-in bearingless permanent magnet synchronous motor, a ferrite permanent magnet material is used for replacing a part of rare earth permanent magnet material, and the ferrite is placed on two sides of the rare earth permanent magnet material. Because the remanence of the ferrite material is lower than that of the rare earth permanent magnet material, the air gap flux density waveform can be closer to a sine wave through combination, and the harmonic content of an air gap magnetic field is reduced, so that the stator iron loss, the torque fluctuation and the suspension force fluctuation caused by the magnetic field harmonic can be reduced. As can be seen from fig. 6, the air gap flux density waveform of the surface-mounted built-in bearingless permanent magnet synchronous motor based on the combined magnetic poles is more sinusoidal than that of the conventional surface-mounted built-in bearingless permanent magnet synchronous motor, so that the iron loss, the torque fluctuation and the levitation force fluctuation of the stator are reduced. In addition, the anti-demagnetization capability of the ferrite permanent magnet material is stronger than that of the rare earth permanent magnet material, the anti-demagnetization capability of the ferrite permanent magnet material is enhanced along with the rise of temperature, and the ferrite is placed on two sides of the rare earth permanent magnet material, so that the local demagnetization risk of the original rare earth permanent magnet material can be greatly reduced, and the running reliability of the motor is improved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (9)
1. A surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot of the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, built-in permanent magnets and surface-mounted permanent magnets, wherein a plurality of V-shaped permanent magnet grooves are formed in the rotor structure body, the built-in permanent magnets are embedded into the permanent magnet grooves, each surface-mounted permanent magnet is provided with a surface facing the permanent magnet groove, the surface-mounted permanent magnets are fixed on the outer circumference of the rotor structure body, the surface polarities of the surface-mounted permanent magnets corresponding to the built-in permanent magnets are different, and the surface-mounted permanent magnets are connected in series on a magnetic circuit.
2. The combined-pole-based surface-mounted-internal bearingless permanent magnet synchronous motor according to claim 1, wherein the rare earth permanent magnet pole and the two ferrite permanent magnet poles are magnetized in parallel in the same direction.
3. The surface-mounted-built-in bearingless permanent magnet synchronous motor based on the combined magnetic poles as claimed in claim 1, wherein the built-in permanent magnets are elongated rare earth permanent magnets, and the rare earth permanent magnets in the same slope channel are magnetized in parallel in the direction perpendicular to the slope channel and in the same magnetizing direction.
4. A surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot of the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, a built-in permanent magnet and a surface-mounted permanent magnet, wherein a plurality of V-shaped permanent magnet grooves are formed in the rotor structure body, the built-in permanent magnets are embedded into the permanent magnet grooves, each surface-mounted permanent magnet is provided with a permanent magnet groove which is opposite to the surface-mounted permanent magnet, the surface-mounted permanent magnet is fixed on the outer circumference of the rotor structure body, the surface polarities of the surface-mounted permanent magnet and the surface-mounted permanent magnet corresponding to the built-in permanent magnet are different, and are connected in series on a magnetic circuit, the surface-mounted permanent magnet is characterized in that the surface-mounted permanent magnet is of a single magnetic pole structure, the built-in permanent magnet is of a combined magnetic pole structure, the magnetic poles of the built-in permanent magnet comprise two rare earth permanent magnetic poles and two ferrite permanent magnetic poles, the two rare earth permanent magnetic poles and the two ferrite permanent magnetic poles are both in a strip shape, and one rare earth permanent magnetic pole and one ferrite permanent magnetic pole are embedded in each slope channel of the V-shaped permanent magnet mounting groove.
5. The surface-mounted-built-in bearingless permanent magnet synchronous motor based on the combined magnetic poles as claimed in claim 4, wherein the rare earth permanent magnet and the ferrite permanent magnet magnetic poles in the same ramp channel are magnetized in parallel in the direction perpendicular to the ramp channel, and the magnetizing directions are the same.
6. The surface-mounted-built-in bearingless permanent magnet synchronous motor based on combined magnetic poles as claimed in claim 4, wherein the surface-mounted permanent magnets are of circular arc magnetic pole structures, and the magnetizing directions are parallel magnetizing.
7. A surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles comprises a rotor and a stator, wherein the rotor is arranged inside the stator, an air gap is reserved between the rotor and the stator, the stator comprises an iron core and a stator winding, a stator winding is arranged in a stator slot of the iron core of the stator, and the stator winding comprises a torque winding and a suspension force winding; the rotor comprises a rotor structure body, a built-in permanent magnet and a surface-mounted permanent magnet, wherein a plurality of V-shaped permanent magnet grooves are formed in the rotor structure body, the built-in permanent magnets are embedded into the permanent magnet grooves, each surface-mounted permanent magnet is provided with a permanent magnet groove which is opposite to the surface-mounted permanent magnet, the surface-mounted permanent magnet is fixed on the outer circumference of the rotor structure body, the surface polarities of the surface-mounted permanent magnet and the surface-mounted permanent magnet corresponding to the built-in permanent magnet are different, and are connected in series on a magnetic circuit, the permanent magnet mounting groove is characterized in that the built-in permanent magnet and the surface-mounted permanent magnet are both provided with a plurality of magnetic poles, the built-in permanent magnet magnetic poles comprise two rare earth permanent magnet magnetic poles and two ferrite permanent magnet magnetic poles, the two rare earth permanent magnet magnetic poles and the two ferrite permanent magnet magnetic poles are both in strip shapes, and one rare earth permanent magnet magnetic pole and one ferrite permanent magnet magnetic pole are embedded into each slope channel of the V-shaped permanent magnet mounting groove; two left and right end faces of the surface-mounted permanent magnet rare earth permanent magnetic pole are respectively provided with a ferrite permanent magnetic pole, and the rare earth permanent magnetic pole and the two ferrite permanent magnetic poles form a continuous annular magnetic pole structure.
8. The combined-pole-based surface-mounted-internal bearingless permanent magnet synchronous motor according to claim 7, wherein the rare earth permanent magnet pole and the two ferrite permanent magnet poles are magnetized in parallel in the same direction.
9. The combined-pole-based surface-mounted-built-in bearingless permanent magnet synchronous motor according to claim 7, wherein the rare earth permanent magnet and the ferrite permanent magnet poles in the same ramp channel are magnetized in parallel in the direction perpendicular to the ramp channel, and the magnetizing directions are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022527206.3U CN213602453U (en) | 2020-11-05 | 2020-11-05 | Surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022527206.3U CN213602453U (en) | 2020-11-05 | 2020-11-05 | Surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles |
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| Publication Number | Publication Date |
|---|---|
| CN213602453U true CN213602453U (en) | 2021-07-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114430203A (en) * | 2021-12-21 | 2022-05-03 | 哈尔滨理工大学 | Surface-mounted high-speed permanent magnet synchronous motor adopting selective-area heavy rare earth magnet |
| CN114915070A (en) * | 2022-05-09 | 2022-08-16 | 山东大学 | Rotor based on double V-shaped permanent magnets and high-speed axial flux permanent magnet motor |
| CN116914964B (en) * | 2023-07-13 | 2024-04-09 | 清华大学 | Hub motor and permanent magnet structure thereof |
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2020
- 2020-11-05 CN CN202022527206.3U patent/CN213602453U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114430203A (en) * | 2021-12-21 | 2022-05-03 | 哈尔滨理工大学 | Surface-mounted high-speed permanent magnet synchronous motor adopting selective-area heavy rare earth magnet |
| CN114430203B (en) * | 2021-12-21 | 2024-04-12 | 哈尔滨理工大学 | Surface-mounted high-speed permanent magnet synchronous motor adopting heavy rare earth magnet in selected area |
| CN114915070A (en) * | 2022-05-09 | 2022-08-16 | 山东大学 | Rotor based on double V-shaped permanent magnets and high-speed axial flux permanent magnet motor |
| CN114915070B (en) * | 2022-05-09 | 2024-01-09 | 山东大学 | Rotor based on double V-shaped permanent magnets and high-speed axial flux permanent magnet motor |
| CN116914964B (en) * | 2023-07-13 | 2024-04-09 | 清华大学 | Hub motor and permanent magnet structure thereof |
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Assignee: Hangzhou Jintou Finance Leasing Co.,Ltd. Assignor: HANGZHOU ZHOUJU ELECTRONIC TECHNOLOGICAL Co.,Ltd. Contract record no.: X2022980028697 Denomination of utility model: Surface-mounted and built-in bearingless permanent magnet synchronous motor based on combined magnetic poles Granted publication date: 20210702 License type: Exclusive License Record date: 20230112 |
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Denomination of utility model: Surface-mounted and built-in bearingless permanent magnet synchronous motor based on combined magnetic poles Effective date of registration: 20230115 Granted publication date: 20210702 Pledgee: Hangzhou Jintou Finance Leasing Co.,Ltd. Pledgor: HANGZHOU ZHOUJU ELECTRONIC TECHNOLOGICAL Co.,Ltd. Registration number: Y2023980031393 |
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Assignee: Hangzhou Jintou Finance Leasing Co.,Ltd. Assignor: HANGZHOU ZHOUJU ELECTRONIC TECHNOLOGICAL Co.,Ltd. Contract record no.: X2022980028697 Date of cancellation: 20240327 |
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Granted publication date: 20210702 Pledgee: Hangzhou Jintou Finance Leasing Co.,Ltd. Pledgor: HANGZHOU ZHOUJU ELECTRONIC TECHNOLOGICAL Co.,Ltd. Registration number: Y2023980031393 |