CN214177101U

CN214177101U - Permanent magnet synchronous motor

Info

Publication number: CN214177101U
Application number: CN202023313634.2U
Authority: CN
Inventors: 罗东东; 张德虎
Original assignee: SF Technology Co Ltd
Current assignee: SF Technology Co Ltd; SF Tech Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-10
Anticipated expiration: 2030-12-30

Abstract

The utility model relates to a permanent magnet synchronous motor, permanent magnet synchronous motor include rotor subassembly, stator module, temperature sensor and drive controller. The stator assembly comprises a stator core, and a main working winding and an auxiliary working winding which are arranged on the stator core. The temperature sensor is electrically connected with the driving controller. Foretell permanent magnet synchronous motor is in the course of the work, through the operating temperature of at least one in temperature sensor response main work winding and the vice work winding, switches into main work winding work or switches into vice work winding work by drive controller according to operating temperature control to can avoid because the winding temperature is too high and lead to breaking down the damage phenomenon, so be favorable to motor safe operation, can prolong permanent magnet synchronous motor's life greatly.

Description

Permanent magnet synchronous motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a permanent magnet synchronous motor.

Background

In recent years, the electric unmanned aerial vehicle is rapidly developed and widely used in the fields of military affairs, public security, agriculture, aerial photography and the like. At present, most unmanned aerial vehicles are driven by permanent magnet synchronous motors. The permanent magnet synchronous motor has the obvious advantages of simple structure, reliable operation, small volume, small mass, less loss, high efficiency, flexible and various shapes and sizes of the motor and the like, and the application field almost extends to various fields of aerospace, national defense, industrial and agricultural production and daily life. The permanent magnet synchronous motor with the conventional design comprises a rotor assembly and a stator assembly, wherein the rotor assembly can rotate relative to the stator assembly and drive a connecting shaft to rotate when in work. Stator module includes stator core and locates the three-phase winding on the stator core. However, when the permanent magnet synchronous motor works for a long time, the permanent magnet synchronous motor is easily damaged due to overhigh temperature of the three-phase winding, the safety of the motor is poor, and the service life of the motor is short.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to overcome the defects in the prior art, and a permanent magnet synchronous motor is provided, which can avoid the damage caused by the over-high temperature of the winding, ensure the safe operation of the motor, and prolong the service life of the motor.

The technical scheme is as follows: a permanent magnet synchronous motor, comprising: the rotor assembly is rotationally connected with the stator assembly, and the stator assembly comprises a stator core, and a main working winding and an auxiliary working winding which are arranged on the stator core; the temperature sensor is electrically connected with the driving controller, the driving controller is further electrically connected with the main working winding and the auxiliary working winding respectively, and the temperature sensor is used for sensing the working temperature of at least one of the main working winding and the auxiliary working winding.

Foretell permanent magnet synchronous motor is in the course of the work, through the operating temperature of at least one in temperature sensor response main work winding and the vice work winding, switches into main work winding work or switches into vice work winding work by drive controller according to operating temperature control to can avoid because the winding temperature is too high and lead to breaking down the damage phenomenon, so be favorable to motor safe operation, can prolong permanent magnet synchronous motor's life greatly.

In one embodiment, the temperature sensor includes a first temperature sensor for sensing an operating temperature of the primary working winding and a second temperature sensor for sensing an operating temperature of the secondary working winding.

In one embodiment, the main working winding comprises more than two main windings arranged on the stator core, and the first temperature sensor is arranged on one of the main windings; and/or the auxiliary working winding comprises more than two auxiliary windings arranged on the stator core, and the second temperature sensor is arranged on one of the auxiliary windings.

In one embodiment, the stator core comprises a stator yoke and more than two stator teeth which are arranged on the stator yoke at intervals in the circumferential direction; the main winding and the auxiliary winding are wound according to the same phase sequence and are alternately arranged on the stator teeth.

In one embodiment, the driving controller further includes a first driving chip and a second driving chip, the first driving chip is used for driving the main working winding to work, and the second driving chip is used for driving the auxiliary working winding to work.

In one embodiment, the rotor assembly includes a rotor housing, two or more magnets, and a motor shaft; more than two magnets are circumferentially wound on the rotor shell at intervals; the motor shaft penetrates through and is fixedly arranged on the rotor shell; stator module is including still including the supporting seat, stator core install in on the supporting seat, the motor shaft still set up with rotating on the supporting seat.

In one embodiment, the rotor housing comprises a head end cover and a coaming connected with the head end cover; more than two the magnet winds bounding wall circumference interval sets up, just the magnet closely pastes and locates on the inner wall of bounding wall.

In one embodiment, a flange is wound on the side surface of the head end cover facing the enclosing plate, and one end of the enclosing plate is sleeved and fixed on the flange; the flange is provided with a clamping groove matched with the magnet, and one end of the magnet is clamped in the clamping groove.

In one embodiment, the rotor housing comprises a head end cover and a coaming connected with the head end cover; the head end cover is provided with a first shaft hole, the supporting seat is provided with a second shaft hole which is coaxial with the first shaft hole, and the motor shaft is fixedly arranged in the first shaft hole and rotatably arranged in the second shaft hole.

In one embodiment, a first anti-slip part is arranged on the outer wall of the motor shaft at a position corresponding to the first shaft hole, and the first anti-slip part is in close contact fit with the hole wall of the first shaft hole.

In one embodiment, the stator assembly further includes a bearing fixedly disposed in the second shaft hole, and the motor shaft is rotatably sleeved in the bearing.

In one embodiment, the bearing comprises a first bearing and a second bearing; and a circumferential boss is arranged on the inner wall of the middle part of the second shaft hole, and the boss divides the second shaft hole into a first cavity for accommodating and fixing the first bearing and a second cavity for accommodating and fixing the second bearing.

In one embodiment, the first bearing is closer to the head end cap than the second bearing; one end of the motor shaft is provided with a collision part which is used for colliding with the side face of the head end cover deviating from the stator core; the other end of the motor shaft is provided with an anti-falling assembly; the anti-falling component and the second bearing deviate from the end face of the head end cover to be in contact with each other and in sliding fit.

In one embodiment, the stator assembly further comprises a tail end cover, the tail end cover is located at one end of the coaming, which is far away from the head end cover, and the tail end cover is connected with the supporting seat.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is an exploded schematic view of a permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 2 is a view structural diagram of a permanent magnet synchronous motor according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view at A-A of FIG. 2;

fig. 4 is a schematic structural diagram of a motor shaft according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a head end cover of a rotor housing according to an embodiment of the present invention;

fig. 6 is a view structural diagram of a stator assembly according to an embodiment of the present invention;

fig. 7 is another view structural diagram of a stator assembly according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view at B-B of FIG. 7;

fig. 9 is a schematic structural diagram of a stator core according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a circuit board according to an embodiment of the present invention;

fig. 11 is a schematic control structure diagram according to an embodiment of the present invention.

10. A rotor assembly; 11. a rotor housing; 111. a head end cap; 112. enclosing plates; 113. a flange; 114. a card slot; 115. a first shaft hole; 12. a magnet; 13. a motor shaft; 131. a first anti-slip portion; 132. a contact part; 14. an anti-drop component; 141. a snap ring; 142. a wear-resistant washer; 143. a locking member; 20. a stator assembly; 21. a stator core; 211. a stator yoke; 212. stator teeth; 22. a main working winding; 23. a secondary working winding; 24. a supporting seat; 241. a second shaft hole; 242. a boss; 243. a first chamber; 244. a second chamber; 25. a first bearing; 26. a second bearing; 27. a tail end cover; 30. a temperature sensor; 31. a first temperature sensor; 32. a second temperature sensor; 40. a drive controller; 41. a circuit board; 42. a first driver chip; 43. a second driver chip; 44. a first wiring portion; 45. a second wiring portion; 46. a third wiring portion; 47. a fourth wiring portion; 48. a MOS element; 491. a capacitor; 492. a power line; 50. and (6) leading out wires of the motor.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1, 6 and 10, fig. 1 shows an exploded schematic view of a permanent magnet synchronous motor according to an embodiment of the present invention, fig. 6 shows one of the view angle structure diagrams of a stator assembly 20 according to an embodiment of the present invention, and fig. 10 shows a schematic structural view of a circuit board 41 according to an embodiment of the present invention. An embodiment of the utility model provides a pair of permanent magnet synchronous motor, permanent magnet synchronous motor include rotor subassembly 10, stator module 20, temperature sensor 30 and drive controller 40.

Referring to fig. 2, fig. 3 and fig. 6, fig. 2 shows a view structure diagram of a permanent magnet synchronous motor according to an embodiment of the present invention, and fig. 3 shows a cross-sectional view of fig. 2 at a-a. The rotor assembly 10 is rotationally coupled to the stator assembly 20. The stator assembly 20 includes a stator core 21, and a main working winding 22 and a sub working winding 23 disposed on the stator core 21. The temperature sensor 30 is electrically connected to the driving controller 40. The driving controller 40 is also electrically connected to the primary working winding 22 and the secondary working winding 23, respectively. The temperature sensor 30 is used for sensing the operating temperature of at least one of the primary working winding 22 and the secondary working winding 23. The driving controller 40 is used for controlling the operation of the primary working winding 22 or the secondary working winding 23 according to the operation temperature.

In the working process of the permanent magnet synchronous motor, the temperature sensor 30 senses the working temperature of at least one of the main working winding 22 and the auxiliary working winding 23, and the driving controller 40 controls to switch to the working of the main working winding 22 or the working of the auxiliary working winding 23 according to the working temperature, so that the phenomenon of fault and damage caused by overhigh winding temperature can be avoided, the motor is favorable for safe operation, and the service life of the permanent magnet synchronous motor can be greatly prolonged.

Specifically, the temperature sensor 30 for sensing the operating temperature of at least one of the primary and secondary working

windings

22 and 23 means: in one embodiment, the temperature sensor 30 can sense the operating temperature of both the primary working winding 22 and the secondary working winding 23. When the working temperature of the main working winding 22 is induced to be higher than a first preset value, the driving controller 40 controls to switch to the auxiliary working winding 23 to work, so that the main working winding 22 stops working and reduces the temperature, and the main working winding 22 is prevented from being damaged; similarly, when the working temperature of the secondary working winding 23 is induced to be higher than the second preset value, the driving controller 40 controls to switch to the working of the primary working winding 22, so that the secondary working winding 23 stops working and reduces the temperature, and the secondary working winding 23 is prevented from being damaged. In another embodiment, the temperature sensor 30 only senses the operating temperature of the main working winding 22, and when the operating temperature of the main working winding 22 is sensed to be higher than the first preset value, the driving controller 40 controls to switch to the operation of the auxiliary working winding 23, so that the main working winding 22 stops operating and reduces the temperature, the main working winding 22 is prevented from being damaged, and the auxiliary working winding 23 can be switched to operate the main working winding 22 after operating for a period of time, which is also a feasible scheme. Similarly, in another embodiment, the temperature sensor 30 only senses the operating temperature of the primary working winding 22, and when sensing that the operating temperature of the secondary working winding 23 is higher than the second preset value, the driving controller 40 controls to switch to the operation of the primary working winding 22, so that the secondary working winding 23 stops operating and lowers the temperature, the damage to the secondary working winding 23 is avoided, and the primary working winding 22 can be switched to operate the secondary working winding 23 after operating for a period of time, which is also a feasible solution. The first preset value and the second preset value may be equal to or unequal to each other, and are set according to actual situations, which are not specifically limited herein.

It should be noted that the specific installation relationship of the driving controller 40 in the permanent magnet synchronous motor is not limited, and the driving controller may be integrated inside the casing of the permanent magnet synchronous motor, for example, disposed on the stator assembly 20; of course, the driving controller 40 may be disposed outside the casing of the permanent magnet synchronous motor and electrically connected to the temperature sensor 30, the main working winding 22, and the sub-working winding 23, respectively, for example, through the motor lead-out wires 50.

Optionally, the temperature sensor 30 and the driving controller 40 may be electrically connected through the motor outlet 50, or may be connected through a wireless transmission method, for example, wifi, bluetooth, 2G, 3G, 4G, and 5G network transmission, and the like, which is not limited herein.

In the present embodiment, the driving controller 40 is electrically connected to the main working winding 22 and the sub-working winding 23 through the motor lead 50.

Referring to fig. 6, in the present embodiment, the temperature sensor 30 includes a first temperature sensor 31 and a second temperature sensor 32, the first temperature sensor 31 is used for sensing the working temperature of the main working winding 22, and the second temperature sensor 32 is used for sensing the working temperature of the auxiliary working winding 23.

Further, the main working winding 22 includes more than two main windings disposed on the stator core 21, and the first temperature sensor 31 is configured to be disposed on one of the main windings. And/or the auxiliary working winding 23 comprises more than two auxiliary windings arranged on the stator core 21, and the second temperature sensor 32 is arranged on one of the auxiliary windings.

Specifically, referring to fig. 1, 6 and 7, fig. 7 shows another view structure diagram of the stator assembly 20 according to an embodiment of the present invention. Further, the main windings are, for example, a first phase winding a1, a second phase winding B1, and a third phase winding C1, respectively. The first temperature sensor 31 is arranged on one of the first phase winding a1, the second phase winding B1 and the third phase winding C1. Thus, the main working winding 22 is a three-phase winding, and the first temperature sensor 31 can acquire the operating temperature of the main working winding 22 by, for example, closely adhering the first temperature sensor 31 to one of the phase windings. The first temperature sensor 31 may obtain the operating temperature of the main working winding 22 by using not only a method of closely adhering to the main working winding 22 but also another induction method, and is not particularly limited herein.

In addition, referring to fig. 1, fig. 6 and fig. 7, the secondary windings are, for example, a first phase winding a2, a second phase winding B2 and a third phase winding C2, and the second temperature sensor 32 is disposed on one of the first phase winding a2, the second phase winding B2 and the third phase winding C2. In this way, the sub-operating winding 23 is also a three-phase winding, and the second temperature sensor 32 can acquire the operating temperature of the sub-operating winding 23 by, for example, closely adhering the second temperature sensor 32 to one of the phase windings. The second temperature sensor 32 may obtain the operating temperature of the sub-operating winding 23 not only by closely adhering to the sub-operating winding 23, but also by other induction methods, and is not particularly limited herein.

It should be noted that the number of the primary windings may also be, for example, 2, 4, 5, 6 or another number, and the number of the secondary windings may also be, for example, 2, 4, 5, 6 or another number.

Further, please refer to fig. 1, fig. 7 and fig. 9, fig. 9 shows a schematic structural diagram of a stator core 21 according to an embodiment of the present invention. In one embodiment, the stator core 21 includes a stator yoke 211 and two or more stator teeth 212 circumferentially spaced on the stator yoke 211. The main windings and the sub-windings are wound in the same phase sequence and alternately arranged on the stator teeth 212.

Specifically, the first phase winding a1 includes two or more split coils a1, the first phase winding a2 includes two or more split coils a2, and the split coils a1 and the split coils a2 are alternately arranged on the stator teeth 212. The second phase winding B1 includes two or more split coils B1, the second phase winding B2 includes two or more split coils B2, and the split coils B1 and the split coils B2 are alternately arranged on the stator teeth 212. The third phase winding C1 includes two or more split coils C1, the third phase winding C2 includes two or more split coils C2, and the split coils C1 and the split coils C2 are alternately arranged on the stator teeth 212. Therefore, the main working winding 22 and the auxiliary working winding 23 are alternately arranged on the stator core 21 according to the same phase sequence, so that when the main working winding 22 and the auxiliary working winding 23 are switched to work, the motor runs more smoothly, the motor can be prevented from being driven out of step, and the initial position of the motor is kept consistent. In addition, since the split coils of the main working winding 22 and the sub working winding 23 are alternately arranged on the stator teeth 212, that is, the split coils of the main working winding 22 and the sub working winding 23 are arranged on different stator teeth 212 instead of the same stator teeth 212, the temperature of the split coils can be reduced, and the arrangement of the first temperature sensor 31 and the second temperature sensor 32 can be facilitated, so that the detection of the first temperature sensor 31 and the detection of the second temperature sensor 32 cannot be influenced mutually, and the detection result is accurate.

Specifically, the first phase winding a1 includes, for example, four split coils a1, the first phase winding a2 includes, for example, four split coils a2, and the four split coils a1 and the four split coils a2 are alternately arranged on eight stator teeth 212 arranged in sequence. Of course, the number of the split coils a1 included in the first phase winding a1 is not limited to four, and may be, for example, two, three, or another number, which is not limited herein. The number of split coils a2 included in the first phase winding a2 is the same as the number of split coils a1 included in the first phase winding a 1.

In addition, the second phase winding B1 and the second winding B2, and the third phase winding C1 and the third winding C2 are similar to the first phase winding a1 and the first phase winding a2, and are not limited herein.

It is to be understood that, as a possible solution, the two or more split coils a1 of the first phase winding a1 and the two or more split coils a2 of the first phase winding a2 are arranged in one-to-one correspondence, and the split coil a1 and the split coil a2 corresponding to the split coil a1 are arranged on the same stator tooth 212, that is, share one stator tooth 212, instead of being arranged separately on two stator teeth 212 as described above. Similarly, the second phase winding B1 and the second phase winding B2, and the third phase winding C1 and the third phase winding C2 are all arranged similarly.

Referring to fig. 7 and 10, fig. 10 is a schematic structural diagram of a circuit board 41 according to an embodiment of the present invention. In one embodiment, the driving controller 40 includes a circuit board 41 and a first wiring portion 44, a second wiring portion 45, a third wiring portion 46 and a fourth wiring portion 47 electrically connected to the circuit board 41. The first connection portion 44 is connected to the first phase winding a1 and the first phase winding a2, the second connection portion 45 is connected to the second phase winding B1 and the second phase winding B2, the third connection portion 46 is connected to the third phase winding C1, and the fourth connection portion 47 is connected to the third phase winding C2.

Referring to fig. 10 and 11, fig. 11 is a schematic diagram illustrating a control structure according to an embodiment of the present invention. Further, the driving controller 40 further includes a first driving chip 42 and a second driving chip 43 disposed on the circuit board 41. The first driving chip 42 is used for driving the main working winding 22 to work, and the second driving chip 43 is used for driving the auxiliary working winding 23 to work.

Referring to fig. 7, fig. 10 and fig. 11, in an embodiment, when the first driving chip 42 is operated, the first driving chip 42 drives the main working winding 22 to operate, that is, the first phase winding a1, the second phase winding B1 and the third phase winding C1 are conducted, and the motor starts to operate; when the first temperature sensor 31 detects that the winding temperature of one of the first phase winding a1, the second phase winding B1 and the third phase winding C1 is greater than or equal to a first preset value (the first preset value is, for example, 90 ℃), the switching relay is closed, the first driving chip 42 is controlled to be switched off, and the second driving chip 43 is switched to work, the second driving chip 43 correspondingly drives the auxiliary working winding 23 to work, that is, the first phase winding a2, the second phase winding B2 and the third phase winding C2 are switched on, and the motor works; when the second temperature sensor 32 detects that the winding temperature of one of the first phase winding a1, the second phase winding B1 and the third phase winding C1 is greater than or equal to a second preset value (e.g., 90 ℃), the first driving chip 42 is switched to operate, and the second driving chip 43 is controlled to stop operating.

In addition, a MOS device 48 and a capacitor 491 are also provided on the circuit board 41. The first driving chip 42, the second driving chip 43, the MOS element 48, and the capacitor 491 are all attached to the circuit board 41, and specifically, for example, a chip mounter is used for chip mounting, so that the production efficiency can be improved. Two power supply lines 492 are connected to the circuit board 41, and are divided into a positive power supply line 492 and a negative power supply line 492.

Referring to fig. 1, 3 to 5, fig. 4 shows a schematic structural diagram of a motor shaft 13 according to an embodiment of the present invention, and fig. 5 shows a schematic structural diagram of a head end cover 111 of a rotor housing 11 according to an embodiment of the present invention. In one embodiment, the rotor assembly 10 includes a rotor housing 11, two or more magnets 12, and a motor shaft 13. Two or more magnets 12 are circumferentially spaced around the rotor housing 11. The motor shaft 13 penetrates and is fixedly arranged on the rotor shell 11. The stator assembly 20 also includes a support base 24. The stator core 21 is mounted on the support base 24, and the motor shaft 13 is also rotatably mounted on the support base 24. Thus, the stator core 21 is rotatably disposed on the motor shaft 13 through the support seat 24, and the overall structure is stable and reliable, and the structure is simple, and the manufacturing cost is low.

Referring to fig. 1, 3 and 5, in one embodiment, the rotor housing 11 includes a head cover 111 and a shroud 112 connected to the head cover 111. More than two magnets 12 are arranged around the circumference of the surrounding plate 112 at intervals, and the magnets 12 are closely attached to the inner wall of the surrounding plate 112.

Referring to fig. 1, 3 and 5, in one embodiment, a flange 113 is wound around a side surface of the head end cover 111 facing the shroud 112, and one end of the shroud 112 is fixed to the flange 113. The flange 113 is provided with a slot 114 corresponding to the magnet 12, and one end of the magnet 12 is clamped in the slot 114. Specifically, the magnet 12 is fixed to the inner wall of the slot 114 by adhesive, the magnet 12 is fixed to the inner wall of the enclosure plate 112 by adhesive, and the contact portion between the enclosure plate 112 and the head end cover 111 is fixed by adhesive. Therefore, the head end cover 111, the coaming 112 and the magnet 12 can be firmly combined together, and the structural stability of the permanent magnet synchronous motor is ensured. Further, the surrounding plate 112 is fixed to the outer wall of the flange 113 in a sleeved manner, and the end face of the surrounding plate 112 is in close contact with the side face of the head end cover 111 facing the surrounding plate 112. The magnet 12 is in close contact fit with all three side walls of the card slot 114. Specifically, the adhesive is a resin adhesive, and may be other types of adhesives, which are not limited herein. Alternatively, the magnet 12, the head end cover 111, and the enclosure plate 112 are not limited to be adhesively fixed by using glue, and may be assembled and fixed together by using a mounting member such as a screw, a pin, a rivet, or the like.

It should be noted that, in infringement comparison, the "surrounding plate 112" may be a part of the "head end cover 111", that is, the "surrounding plate 112" is integrally formed with the "other part of the head end cover 111"; the "shroud 112" may be manufactured separately and then integrated with the "other portion of the head cover 111" as a single unit.

Referring to fig. 1, 3 and 5, in one embodiment, the rotor housing 11 includes a head cover 111 and a shroud 112 connected to the head cover 111. The head end cover 111 is provided with a first shaft hole 115, the support base 24 is provided with a second shaft hole 241 coaxially arranged with the first shaft hole 115, and the motor shaft 13 is fixedly arranged in the first shaft hole 115 and rotatably arranged in the second shaft hole 241.

Referring to fig. 1, 3 and 5, in an embodiment, a first anti-slip portion 131 is disposed on a portion of an outer wall of the motor shaft 13 corresponding to the first shaft hole 115, and the first anti-slip portion 131 is in close contact with and fits with a hole wall of the first shaft hole 115. Therefore, when the motor works, the first anti-slip part 131 and the hole wall of the first shaft hole 115 can generate torque, so that the phenomenon of slipping between the motor shaft 13 and the rotor housing 11 is prevented, and the rotor housing 11 and the motor shaft 13 can synchronously rotate. Specifically, the first anti-slip portion 131 may be, for example, a knurl, a centimetre, a spline shaft, a bump, or the like.

Alternatively, for example, the hole wall of the first shaft hole 115 may be configured as a spline groove, a bump, or the like, which also can achieve the purpose of avoiding the slipping of the motor shaft 13 and the inner rotor, and the slipping of the motor shaft 13 and the outer rotor. Alternatively, the motor shaft 13 may be fixed to the hole wall of the first shaft hole 115 by using an adhesive, or the motor shaft 13 may be fixed to the hole wall of the first shaft hole 115 by using a welding, riveting, clamping, or the like, which is not limited herein.

Referring to fig. 3, 4 and 8, fig. 8 shows a cross-sectional view at B-B of fig. 7. In one embodiment, the stator assembly 20 further includes a bearing fixedly disposed in the second shaft hole 241, and the motor shaft 13 is rotatably sleeved in the bearing.

Referring to fig. 1, 3, 4 and 8, the bearing further includes a first bearing 25 and a second bearing 26. A circumferential boss 242 is disposed on an inner wall of a middle portion of the second shaft hole 241, and the boss 242 divides the second shaft hole 241 into a first chamber 243 for accommodating and fixing the first bearing 25 and a second chamber 244 for accommodating and fixing the second bearing 26. So, motor shaft 13 supports through first bearing 25 and second bearing 26 in step for installation stability is better, can improve the motor performance. In addition, during the assembling process, the first bearing 25 is inserted into and fixed to the first chamber 243 from one end of the first shaft hole 115, and the second bearing 26 is inserted into and fixed to the second chamber 244 from the other end of the first shaft hole 115, which is convenient to operate. It is understood that, as an alternative, the number of the bearings is not limited to two, but may be one, three or other number, and is not limited specifically herein.

It should be noted that there are many embodiments of the manner of accommodating and fixing the first bearing 25 in the first chamber 243, for example, the outer wall of the first bearing 25 and the inner wall of the first chamber 243 are fixed by using glue, and for example, the outer wall of the first bearing 25 and the inner wall of the first chamber 243 are fixed and combined together by using a close fit manner, and the like, and the embodiments are not limited herein. The second chamber 244 receives the fixed second bearing 26 in a similar manner and will not be described in detail herein.

Referring to fig. 1, 3, 4, and 8, in one embodiment, first bearing 25 is closer to head end cap 111 than second bearing 26. One end of the motor shaft 13 is provided with an abutting portion 132, and the abutting portion 132 is used for abutting against the side surface of the head end cover 111 departing from the stator core 21. The other end of the motor shaft 13 is provided with an anti-drop assembly 14. Retaining assembly 14 abuts and is in sliding engagement with the end face of second bearing 26 facing away from head end cap 111. Thus, the abutting portion 132 abuts against the side surface of the head end cover 111 away from the stator core 21, and the anti-falling off assembly 14 abuts against the end surface of the second bearing 26, so as to play a limiting role, i.e. prevent the motor shaft 13 from moving in the axial direction relative to the supporting seat 24. The anti-slip assembly 14 specifically includes, for example, a snap ring 141 snap-fitted to one end of the motor shaft 13, and a wear-resistant washer 142 sleeved on the motor shaft 13, wherein the wear-resistant washer 142 is disposed between the snap ring 141 and an end surface of the second bearing 26 departing from the head end cover 111. In addition, the anti-dropping assembly 14 further includes a locking member 143, and the locking member 143 is installed at the end of the motor shaft 13 and is abutted to the snap ring 141, so as to further stabilize the snap ring 141 and the wear-resistant washer 142. The locking member 143 is specifically, for example, a bolt, and the like, and is not limited herein. The wear-resistant washer 142 is, for example, a copper washer, and facilitates the rotation of the motor shaft 13 relative to the end face of the second bearing 26, thereby improving the operation stability of the motor.

Referring to fig. 1, 3, 4, and 8, in one embodiment, the stator assembly 20 further includes a tail end cap 27. The end cap 27 is located at an end of the shroud 112 facing away from the head cap 111, and the end cap 27 is connected to the support base 24. So, afterbody end cover 27 can improve the protection level of motor, prevents that the grit from getting into the inside motor card that causes of motor and dies.

Specifically, the tail end cap 27 is, for example, in close contact with the support seat 24 and is fixedly connected together by screws, pins, rivets, or adhesive.

Specifically, the stator core 21 is, for example, a collar-shaped and is fitted and fixed to the support base 24. And the part that stator core 21 and supporting seat 24 contacted is equipped with the viscose and bonds fixedly to guarantee stator core 21 stability on supporting seat 24, prevent that stator core 21 from taking off.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims

1. A permanent magnet synchronous motor, comprising:

the rotor assembly is rotationally connected with the stator assembly, and the stator assembly comprises a stator core, and a main working winding and an auxiliary working winding which are arranged on the stator core;

the temperature sensor is electrically connected with the driving controller, the driving controller is further electrically connected with the main working winding and the auxiliary working winding respectively, and the temperature sensor is used for sensing the working temperature of at least one of the main working winding and the auxiliary working winding.

2. The permanent magnet synchronous motor of claim 1, wherein the temperature sensor comprises a first temperature sensor for sensing an operating temperature of the primary working winding and a second temperature sensor for sensing an operating temperature of the secondary working winding.

3. The permanent magnet synchronous motor according to claim 2, wherein the main working winding comprises more than two main windings arranged on the stator core, and the first temperature sensor is arranged on one of the main windings; and/or the auxiliary working winding comprises more than two auxiliary windings arranged on the stator core, and the second temperature sensor is arranged on one of the auxiliary windings.

4. The permanent magnet synchronous motor according to claim 3, wherein the stator core includes a stator yoke and two or more stator teeth circumferentially spaced on the stator yoke; the main winding and the auxiliary winding are wound according to the same phase sequence and are alternately arranged on the stator teeth.

5. The permanent magnet synchronous motor according to claim 1, wherein the driving controller further comprises a first driving chip and a second driving chip, the first driving chip is used for driving the main working winding to work, and the second driving chip is used for driving the auxiliary working winding to work.

6. The permanent magnet synchronous motor of claim 1, wherein the rotor assembly comprises a rotor housing, two or more magnets, and a motor shaft; more than two magnets are circumferentially wound on the rotor shell at intervals; the motor shaft penetrates through and is fixedly arranged on the rotor shell; stator module is including still including the supporting seat, stator core install in on the supporting seat, the motor shaft still set up with rotating on the supporting seat.

7. The permanent magnet synchronous motor of claim 6, wherein the rotor housing comprises a head end cap and a shroud connected to the head end cap; more than two the magnet winds bounding wall circumference interval sets up, just the magnet closely pastes and locates on the inner wall of bounding wall.

8. The permanent magnet synchronous motor according to claim 7, wherein a flange is wound on the side surface of the head end cover facing the enclosing plate, and one end of the enclosing plate is sleeved and fixed on the flange; the flange is provided with a clamping groove matched with the magnet, and one end of the magnet is clamped in the clamping groove.

9. The permanent magnet synchronous motor of claim 6, wherein the rotor housing comprises a head end cap and a shroud connected to the head end cap; the head end cover is provided with a first shaft hole, the supporting seat is provided with a second shaft hole which is coaxial with the first shaft hole, and the motor shaft is fixedly arranged in the first shaft hole and rotatably arranged in the second shaft hole.

10. The permanent magnet synchronous motor according to claim 9, wherein a first anti-slip portion is provided on a portion of the outer wall of the motor shaft corresponding to the first shaft hole, and the first anti-slip portion is in close contact fit with a wall of the first shaft hole.

11. The permanent magnet synchronous motor according to claim 9, wherein the stator assembly further comprises a bearing fixedly disposed in the second shaft hole, and the motor shaft is rotatably sleeved in the bearing.

12. The permanent magnet synchronous motor of claim 11, wherein the bearing comprises a first bearing and a second bearing; and a circumferential boss is arranged on the inner wall of the middle part of the second shaft hole, and the boss divides the second shaft hole into a first cavity for accommodating and fixing the first bearing and a second cavity for accommodating and fixing the second bearing.

13. The permanent magnet synchronous motor of claim 12, wherein the first bearing is closer to the head end cap than the second bearing; one end of the motor shaft is provided with a collision part which is used for colliding with the side face of the head end cover deviating from the stator core; the other end of the motor shaft is provided with an anti-falling assembly; the anti-falling component and the second bearing deviate from the end face of the head end cover to be in contact with each other and in sliding fit.

14. The permanent magnet synchronous motor of claim 9, wherein the stator assembly further comprises a tail end cap, the tail end cap is located at an end of the shroud plate facing away from the head end cap, and the tail end cap is connected to the support base.