Outer rotor permanent magnet synchronous motor

Abstract

The outer rotor permanent magnet synchronous motor comprises a shell, a synchronous motor assembly is arranged at one end in the shell, and the synchronous motor assembly comprises a stator and a rotor; an oil pump is installed at the other end in the shell and located at the bottom of the shell. An oil duct is arranged in the shell and provided with an oil spraying hole facing the stator. The synchronous motor assembly also includes a Hall sensor that identifies the position of the rotor. In the invention, the oil pump arranged in the shell is matched with the oil duct, oil is pumped to the oil duct from the bottom of the shell, is sprayed out from the oil spraying hole and reaches the end part of the stator, so that oil cooling circulation is realized, the temperature of the motor is reduced, a good heat dissipation effect can be formed on the motor, and the motor is prevented from generating a large amount of heat in the operation process to influence the calibration of the motor; the motor is even burnt down; the structure is simple and compact, and the cost and the motor size can be reduced.

Description

Technical Field

[0001] The invention relates to an outer rotor motor, in particular to an outer rotor permanent magnet synchronous motor. Background Art

[0002] In new energy motors, vehicles generally require greater power and output torque. Outer rotor motors mainly rely on air cooling to reduce temperature so that the motor can work normally. However, some motors cannot achieve good heat dissipation through cooling air, so oil cooling circulation is required to dissipate heat from the motor.

[0003] Chinese patent document CN109980822A discloses a fast-cooling outer rotor permanent magnet synchronous motor, comprising a stator body, a rotor, a winding, a motor shaft, a first stator top cover, a second stator top cover, a first oil-cooled bearing and a second oil-cooled bearing. The oil cooling oil channel of the motor is composed of the oil channel in the motor shaft, the channel in the first oil-cooled bearing and the second oil-cooled bearing cavity, and the oil channel in the stator blade to form an oil channel circuit. Due to the adoption of the above technical solution, the present invention simplifies the cooling system structure of the motor, greatly improves the cooling efficiency of the motor, and prolongs the service life of the motor.

[0004] The prior art has the following disadvantages: In the prior art, the oil passage for cooling is arranged in the stator blades, so the stator blades need to be modified, and the motor stator has a large number of blades, which leads to a significant increase in the cost of the motor. Summary of the invention

[0005] In order to solve the problem that the oil cooling structure of the outer rotor permanent magnet synchronous motor in the prior art will cause the motor cost to increase significantly, the present invention provides an outer rotor permanent magnet synchronous motor, including a shell, one end of which is provided with a synchronous motor assembly, and the synchronous motor assembly includes a stator and a rotor; wherein: an oil pump is installed at the other end of the shell, and the oil pump is located at the bottom of the shell; an oil channel is provided in the shell, and an oil injection hole on the oil channel faces the stator; the synchronous motor assembly also includes a Hall sensor for identifying the rotor position.

[0006] In this solution, the oil passages for cooling are uniformly arranged on the housing, and the oil pump arranged at the bottom of the housing pumps the oil at the bottom of the housing to the oil passages, and then the oil is dispensed from the oil spray holes on the oil passages, reaches the end of the stator, and then drips from the stator back to the bottom of the housing, thereby realizing oil cooling circulation, thereby reducing the temperature of the motor components. Compared with the prior art, the arrangement of the oil passages and the oil spray holes in this solution can reduce the manufacturing cost of the motor, and the lower-cost Hall sensor is used in this solution, which further reduces the manufacturing cost of the motor; in addition, in this solution, the oil pump is also arranged inside the housing, which fully utilizes the internal space of the housing and can also reduce the volume of the motor.

[0007] Preferably, the oil channel includes a plurality of channels interconnected with each other, and a plurality of oil spray holes are arranged on the channels. In this solution, the arrangement of the channels interconnected with each other and the oil spray holes can realize multi-directional cooling of the stator, ensuring the oil cooling effect.

[0008] Preferably, a motor shaft is provided at one end of the housing where the oil pump is installed, and the driving end of the motor shaft is connected to the synchronous motor assembly, and the motor shaft is also meshed with the oil pump through a driving tooth. In this solution, the synchronous motor assembly and the oil pump are driven by the motor shaft, and the oil pump does not need additional power drive, and the structure is simple.

[0009] Preferably, the motor shaft and the driving gear are interference fit.

[0010] Preferably, one end of the housing where the oil pump is arranged is connected to a first end cover, and the other end of the housing is connected to a second end cover.

[0011] Preferably, the middle part of the first end cover and the second end cover is provided with an oil seal hole, a bearing hole and a retaining ring hole in sequence along the oil injection direction of the oil pump, an oil seal is provided in the oil seal hole, a bearing is installed in the bearing hole, and a retaining ring is installed in the retaining ring hole. In this solution, the sealing of the housing is ensured by the cooperation of the oil seal hole, the bearing hole and the retaining ring hole, and the oil seal, the bearing and the retaining ring.

[0012] Preferably, a central bearing hole and a central retaining ring hole are provided in the center of the housing, the central bearing hole is provided with a central bearing, and the central retaining ring hole is provided with a central retaining ring. In this solution, the arrangement of the central bearing hole, the central retaining ring hole, the central bearing and the central retaining ring further ensures the sealing inside the housing.

[0013] Preferably, the motor shaft and the central bearing and the two bearing inner rings on the first end cover and the second end cover are clearance-fitted. In this solution, the setting of clearance-fitting can ensure that the motor rotation process is controlled within a small range, avoid motor scratching, and increase the service life of the motor.

[0014] Preferably, a bench assembly is also included, which includes a bench and a dynamometer output shaft connected to the motor shaft through a spline, and the dynamometer output shaft drives the motor shaft to rotate.

[0015] Preferably, the stand assembly further comprises a flange connected to the stand, and one end of the housing provided with the oil pump is connected to the flange via an end cover.

[0016] The present invention has the following beneficial effects: in the present invention, the oil pump built into the housing cooperates with the oil channel to pump oil from the bottom of the housing to the oil channel, spray it out from the oil spray hole, and reach the end of the stator to realize oil cooling circulation, reduce the temperature of the motor, and form a good heat dissipation effect for the motor, avoiding the motor from generating a large amount of heat during operation, thereby affecting the calibration of the motor and even burning the motor; the structure is simple and compact, which can reduce costs and reduce the size of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an assembly schematic diagram of an outer rotor permanent magnet synchronous motor embodiment of the present invention ①; Figure 2 ② is a schematic diagram of an embodiment of an outer rotor permanent magnet synchronous motor of the present invention; Figure 3 It is the left side view of the shell; Figure 4 for Figure 3 sectional view of . DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods: 1. Definition Hall sensor: A magnetic field sensor made based on the Hall effect, which can detect the position of the motor rotor.

[0019] 2. The reference numerals in the drawings of the specification include: dynamometer output shaft 1, flange 2, first end cover 3, first oil seal 4, first bearing 5, first retaining ring 6, motor shaft 7, drive gear 8, oil pump 9, center retaining ring 10, center bearing 11, housing 12, synchronous motor assembly 13, locking nut 14, second oil seal 15, second end cover 16, second bearing 17, second retaining ring 18, stop 19, oil passage 20, and mounting opening 21.

[0020] Note: The arrow in the figure indicates the direction of fuel injection.

[0021] The embodiment is basically as shown in the attached Figure 1-Figure 4 As shown: an outer rotor permanent magnet synchronous motor, including a housing 12, a synchronous motor assembly 13 is provided at one end of the housing 12, and the synchronous motor assembly 13 includes a stator and a rotor. A stopper 19 is provided at the right end of the housing 12 for mounting and fixing the synchronous motor assembly 13, and a locking nut 14 is used for fixing in this embodiment.

[0022] An oil pump 9 is installed at the other end of the housing 12, and the oil pump 9 is located at the bottom of the housing 12; an oil passage 20 is provided in the housing 12, and an oil injection hole on the oil passage 20 faces the stator; the synchronous motor assembly 13 also includes a Hall sensor for identifying the rotor position. Specifically, a mounting port 21 for the oil pump 9 is provided at the bottom of the center of the left end of the housing 12, and the mounting port 21 fixes the oil pump 9 through a threaded hole. The oil passage 20 includes a plurality of channels that are interconnected in pairs, and a plurality of oil injection holes are provided on the channels.

[0023] The housing 12 is also provided with a bench assembly at one end where the oil pump 9 is installed. The bench assembly includes a bench, a dynamometer output shaft 1, a motor shaft 7 and a flange 2. The dynamometer output shaft 1 is provided with multiple through holes for oil and is connected to the bench. The dynamometer output shaft 1 is connected to the motor shaft 7 through a spline and drives the motor shaft 7 to rotate. The driving end of the motor shaft 7 is connected to the synchronous motor assembly 13. The motor shaft 7 is also meshed with the motor pump through the driving gear 8 to drive the oil pump 9 to work. The motor shaft 7 and the driving gear 8 are interference fit. The flange 2 has a through hole for fixing the motor assembly and connecting it to the bench.

[0024] One end of the housing 12 where the oil pump 9 is provided is connected to the first end cover 3, and the other end of the housing 12 is connected to the second end cover 16. The first end cover 3 is located at the left end of the housing 12, and the second end cover 16 is located at the right end of the housing 12. The first end cover 3 and the second end cover 16 are fixedly connected to the housing 12 by bolts.

[0025] The first end cover 3 and the second end cover 16 are provided with oil seal holes, bearing holes and retaining ring holes in the middle along the oil injection direction of the oil pump 9. The oil seal holes are provided with oil seals, the bearing holes are provided with bearings, and the retaining ring holes are provided with retaining rings. Correspondingly, the first end cover 3 is provided with a first oil seal 4, a first bearing 5 and a first retaining ring 6 in the middle from left to right, and the second end cover 16 is provided with a second oil seal 15, a second bearing 17 and a second retaining ring 18 in the middle from left to right.

[0026] A center bearing 11 hole and a center retaining ring 10 hole are opened at the center of the housing 12 . The center bearing 11 hole is provided with a center bearing 11 , and the center retaining ring 10 hole is provided with a center retaining ring 10 .

[0027] The first end cover 3 is provided with a plurality of threaded holes, and the flange 2 is fixedly connected to the first end cover 3 by bolts.

[0028] The motor shaft 7 is matched with the bearings in the first end cover 3 and the second end cover 16 and the inner ring clearance of the center bearing 11, which can ensure that the motor rotation process is controlled within a small range and avoid motor friction.

[0029] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An outer rotor permanent magnet synchronous motor, comprising a housing, wherein a synchronous motor assembly is disposed at one end of the housing, wherein the synchronous motor assembly comprises a stator and a rotor; characterized in that: An oil pump is installed at the other end of the housing, and the oil pump is located at the bottom of the housing; an oil channel is provided in the housing, and the oil channel is provided with an oil injection hole facing the stator; the synchronous motor assembly also includes a Hall sensor for identifying the position of the rotor.

2. The outer rotor permanent magnet synchronous motor according to claim 1, characterized in that: The oil passage includes a plurality of passages communicating with each other, and a plurality of the oil injection holes are arranged on the passages.

3. The outer rotor permanent magnet synchronous motor according to claim 2, characterized in that: A motor shaft is provided at one end of the housing where the oil pump is installed. The driving end of the motor shaft is connected to the synchronous motor assembly. The motor shaft is also meshed with the oil pump via a driving tooth.

4. The outer rotor permanent magnet synchronous motor according to claim 3, characterized in that: The motor shaft and the driving gear are interference fit.

5. The outer rotor permanent magnet synchronous motor according to claim 3 or 4, characterized in that: One end of the housing where the oil pump is arranged is connected to a first end cover, and the other end of the housing is connected to a second end cover.

6. The outer rotor permanent magnet synchronous motor according to claim 5, characterized in that: The middle parts of the first end cover and the second end cover are provided with an oil seal hole, a bearing hole and a retaining ring hole in sequence along the oil injection direction of the oil pump. An oil seal is provided in the oil seal hole, a bearing is installed in the bearing hole, and a retaining ring is installed in the retaining ring hole.

7. The outer rotor permanent magnet synchronous motor according to claim 6, characterized in that: A central bearing hole and a central retaining ring hole are provided at the center of the shell. The central bearing hole is provided with a central bearing, and the central retaining ring hole is provided with a central retaining ring.

8. The outer rotor permanent magnet synchronous motor according to claim 7, characterized in that: The motor shaft is clearance-fitted with the central bearing and the two bearing inner rings on the first end cover and the second end cover.

9. The outer rotor permanent magnet synchronous motor according to claim 8, characterized in that: It also includes a bench assembly, which includes a bench and a dynamometer output shaft connected to the motor shaft through a spline, and the dynamometer output shaft drives the motor shaft to rotate.

10. The outer rotor permanent magnet synchronous motor according to claim 9, characterized in that: The stand assembly also includes a flange connected to the stand, and one end of the housing provided with the oil pump is connected to the flange through the end cover.

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