Motor integrated with signal collector and magnetic hysteresis device

Abstract

A motor integrated with a signal collector and a magnetic hysteresis device, comprising a motor and a cover assembly, wherein the cover assembly comprises a cover, a circuit board assembly, an end cover, an outer magnetic ring, an inner magnetic ring and an iron core which are coaxially arranged; one side of the cover is fixed to a housing of the motor; two Hall sensing elements spaced apart from each other are provided on the end surface of a printed circuit board of the printed circuit board assembly; the center of the printed circuit board is fixed to a motor shaft; the outer ring of the printed circuit board is fixed to the cover; the iron core is arranged opposite to the printed circuit board; the center of the iron core is fixed to the motor shaft; the inner magnetic ring is fixed to an outer circle surface of the iron core by means of an inner hole formed; N poles and S poles are sequentially and alternately provided on an outer circle surface of the inner magnetic ring; the outer magnetic ring is sleeved outside the inner magnetic ring, and an air gap is formed between the outer magnetic ring and the inner magnetic ring; the outer magnetic ring is fixed to the inner wall of the end cover; and the inner side of the end cover is fixed to the other side of the cover. During the rotation of the motor, the two Hall elements measure the number of rotations of the motor by means of sensing the N poles and the S poles which are sequentially and alternately provided on the outer circle surface of the inner magnetic ring, and a magnetic hysteresis torque is generated between the inner magnetic ring and the outer magnetic ring.

Description

A motor with integrated signal collector and hysteresis device Technical Field

[0001] The present invention relates to a motor, and in particular to a motor integrating a signal collector and a hysteresis device. Background Art

[0002] With the rapid development of intelligent automobiles, the opening mechanisms of electric tailgates and gull-wing doors are designed with a memory function that allows car owners to set the opening height according to their usage habits. The opening mechanism of electric side doors is designed with an opening angle memory function. In addition, in order to ensure that the tailgate and gull-wing doors can remain hovering and self-locking when in the open state due to the downward torque generated by their own gravity, and that the side doors can remain hovering and self-locking when the car is parked on a sloped road after opening due to the lateral torque generated by gravity, it is necessary to set a signal collector and a hysteresis device on the motor used in the opening mechanism to achieve the above functions.

[0003] As shown in Figures 1 to 3, the existing motor assembly 1 includes a signal collector 11, a motor 12 and a hysteresis device 13. The signal collector 11 is composed of a printed circuit board assembly 111, an end cover 112 and a magnetic disk 113. The end surface 1132 of the magnetic disk 113 is sequentially provided with alternatingly distributed N poles and S poles, and is fixed to the motor shaft 122 through a circular hole 1131 provided in the center of the magnetic disk 113. During the rotation of the motor 12, the two Hall elements 1111 provided on the printed circuit board assembly 111 track and monitor the number of rotations of the motor 12 by sensing the N pole and the S pole. The vehicle ECU realizes the memory function of the opening height and opening angle by accurately controlling the number of rotations. The hysteresis device 13 is composed of a fastening ring 131, a fixing seat 132, an outer magnetic ring 133, an inner magnetic ring 134 and a driving shaft 135. The outer magnetic ring 133 and the fixing seat 132 are integrally formed by insert injection molding. The fastening ring 131 is installed on the motor 12, the fixing seat 132 is installed on the fastening ring 131, and the inner magnetic ring 134 is installed on the driving shaft 135. The driving shaft 135 is connected to the motor shaft 122. An air gap is formed between the outer circular surface of the inner magnetic ring 134 and the inner hole of the outer magnetic ring 133. During the rotation of the motor 12, the inner magnetic ring 134 and the outer magnetic ring 133 generate a hysteresis torque to realize the hovering self-locking function of the tailgate, gull-wing door and side door in the open state. The existing signal collector 11 and hysteresis device 13 are designed at the front end and rear end of the motor respectively. The overall structure is relatively complex, a large number of components are used, the weight is relatively heavy, and the cost is relatively high. In addition, because the drive shaft 135 and the motor shaft 122 are connected by an interference fit, vibration is prone to occur during operation, which will have a certain impact on the stability and reliability of the mechanism. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a motor with an integrated signal collector and a hysteresis device in view of the existing technical situation, so that the motor has a simple and compact structure.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A motor with an integrated signal collector and a hysteresis device comprises a motor and a cover assembly, wherein the cover assembly comprises a coaxially arranged cover, a circuit board assembly, an end cover, an outer magnetic ring, an inner magnetic ring and an iron core, one side of the cover being fixed to the housing of the motor, two spaced-apart Hall effect sensing elements are provided on the end face of the printed circuit board of the printed circuit board assembly, the center of the printed circuit board is fixed to the motor shaft, and the outer ring is fixed to the cover, the iron core is arranged opposite to the printed circuit board, the center of the iron core is fixed to the motor shaft, the inner magnetic ring is fixed to the outer circumferential surface of the iron core through an inner hole, the outer circumferential surface of the inner magnetic ring is alternately provided with an N pole and an S pole, the outer magnetic ring is sleeved outside the inner magnetic ring and an air gap is formed between the two, the outer magnetic ring is fixed to the inner wall of the end cover, and the inner side of the end cover is fixed to the other side of the cover; during the rotation of the motor, the two Hall effects sensing the N poles and S poles alternately provided on the outer circumferential surface of the inner magnetic ring detects the number of rotations of the motor, and a hysteresis torque is generated between the inner and outer magnetic rings.

[0007] Preferably, the outer magnetic ring and the end cover are integrally formed by insert injection molding.

[0008] Better yet, the end cover is provided with multiple positioning bosses on the left and right sides of the inner hole, an annular boss is provided at the left end of the inner hole and an annular end face is provided at the right end, which respectively cooperate with the positioning grooves provided on the left and right sides of the outer circular surface of the outer magnetic ring and the left end face and right end face of the outer magnetic ring to prevent the outer magnetic ring from rotating and moving axially due to the action of the hysteresis torque, so that it is fixed on the end cover more firmly and reliably.

[0009] Preferably, the core is provided with a plurality of symmetrically distributed flattened portions on the outer circumferential surface, which respectively cooperate with a plurality of symmetrically distributed flattened portions provided on the inner hole of the inner magnetic ring, so as to prevent the inner magnetic ring from rotating relative to the core due to the hysteresis torque.

[0010] Preferably, glue is applied to the fitting area between the outer cylindrical surface of the iron core and the inner hole of the inner magnetic ring to prevent the inner magnetic ring from axially moving relative to the iron core.

[0011] Preferably, glue is applied to the press-fitting position between the inner hole of the iron core and the motor shaft to prevent the iron core from rotating or moving axially relative to the motor shaft.

[0012] More specifically, the inner hole of the iron core is provided with an interference fit with the motor shaft to prevent the iron core from rotating or moving axially relative to the motor shaft.

[0013] More specifically, the outer magnetic ring is made of isotropic non-oriented magnetic material. Under the same specifications and dimensions, the higher the remanence Br of the material used, the smaller the coercive force Hcj, and the better the effect of generating hysteresis torque.

[0014] More specifically, the inner magnetic ring is made of permanent magnetic material. Under the same specifications and dimensions, the higher the residual magnetism Br of the material used, the better the effect of generating hysteresis torque.

[0015] Alternatively, the motor shaft may be symmetrically provided with flattened portions at the core installation position, and the inner hole of the core may also be symmetrically provided with flattened portions, which can also prevent the core from rotating relative to the motor shaft.

[0016] Compared with the existing technology, the advantages of the present invention are: by integrating the signal collector and the hysteresis device, the magnetic disk parts in the existing motor are eliminated, so that the inner magnetic ring has the functions of generating hysteresis torque with the outer magnetic ring and sensing with the Hall element. At the same time, by eliminating the drive shaft, the defect of the interference fit connection between the drive shaft and the motor shaft that is prone to vibration is overcome, the motor structure is made compact, the number of components used is relatively reduced, the weight is reduced, the cost is reduced, and the stability and reliability of the mechanism are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of an existing motor.

[0018] FIG. 2 is a schematic diagram of a printed circuit board assembly of a conventional motor.

[0019] FIG3 is a schematic diagram of a magnetic disk of an existing motor.

[0020] FIG4 is a schematic structural diagram of a motor integrating a signal collector and a hysteresis device according to an embodiment of the present invention.

[0021] FIG. 5 is a cross-sectional view taken along line AA in FIG. 4 .

[0022] FIG6 is a magnetic field line distribution diagram along the line BB in FIG4 .

[0023] FIG7 is a schematic diagram of a printed circuit board assembly of a motor integrating a signal collector and a hysteresis device according to an embodiment of the present invention.

[0024] FIG8 is a schematic diagram of a motor cover integrating a signal collector and a hysteresis device according to an embodiment of the present invention.

[0025] FIG9 is a schematic diagram of an end cover of a motor integrating a signal collector and a hysteresis device according to an embodiment of the present invention.

[0026] FIG10 is a schematic diagram of the outer magnetic ring of a motor integrating a signal collector and a hysteresis device according to an embodiment of the present invention.

[0027] FIG11 is a schematic diagram of the iron core of a motor integrating a signal collector and a hysteresis device according to an embodiment of the present invention.

[0028] FIG12 is a schematic diagram of the inner magnetic ring of the motor integrating the signal collector and the hysteresis device according to an embodiment of the present invention.

[0029] Reference numerals: 1. Motor assembly; 11. Signal collector; 111. Printed circuit board assembly; 1111. Hall element; 112. End cover; 113. Disk; 1131. Circular hole; 1132. End face; 12. Motor; 121. Cover; 122. Motor shaft; 13. Hysteresis device; 131. Fastening ring; 132. Fixing seat; 133. Outer magnetic ring; 134. Inner magnetic ring; 135. Drive shaft; 2. Motor; 21. Stator assembly; 211. Housing; 22. Rotor assembly; 221. Motor shaft; 23. Cover assembly; 231. Printed circuit board assembly; 2311. Circuit board; 23111. Semicircular hole; 2312 , Hall element; 232, machine cover; 2321, fixing column; 2322, circular hole; 233, end cover; 2331, inner hole; 2332, annular boss; 2333, annular end face; 2334, outer cylindrical surface; 2335, positioning boss; 2336, positioning boss; 234, outer magnetic ring; 2341, left end face; 2342, inner hole; 2343, right end face; 2344, outer cylindrical surface; 2345, positioning groove; 2346, positioning groove; 235, iron core; 2351, flat position; 2352, outer cylindrical surface; 2353, inner hole; 236, inner magnetic ring; 2361, outer cylindrical surface; 2362, inner hole; 2363, flat position. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] As shown in FIG4-12 , a motor 2 with an integrated signal collector and a hysteresis device includes a motor body and a cover assembly 23 .

[0032] The motor body includes a stator assembly 21 and a rotor assembly 22 .

[0033] The cover assembly 23 includes a coaxially arranged printed circuit board assembly 231 , a cover 232 , an end cover 233 , an outer magnetic ring 234 , an iron core 235 and an inner magnetic ring 236 .

[0034] Two Hall sensors 2312 are provided on the end surface of the circuit board 2311 of the printed circuit board assembly 231, and the printed circuit board assembly 231 is fixed to the cover 232 through the cooperation of multiple semicircular holes 23111 provided on the outer surface of the circuit board 2311 and multiple fixing columns 2321 provided on the cover 232.

[0035] The cover 232 is fixed to the housing 211 of the stator assembly 21 .

[0036] The inner magnetic ring 236 is fixed on the outer circumferential surface 2352 of the iron core 235 through the inner hole 2362 . An inner hole 2353 is provided in the center of the iron core 235 and is press-fitted onto the motor shaft 221 .

[0037] The outer magnetic ring 234 and the end cover 233 are integrally formed by insert injection molding. The end cover 233 is provided with an outer circular surface 2334 which cooperates with the circular hole 2322 provided in the machine cover 232 to fix the end cover 233 on the machine cover 232.

[0038] An air gap is formed between the outer circumferential surface 2361 of the inner magnetic ring 236 and the inner hole 2342 of the outer magnetic ring 234 .

[0039] During motor 2 rotation, two Hall elements 2312 on printed circuit board assembly 231 track and monitor the number of motor 2 revolutions by sensing the alternating north and south poles on the outer surface 2361 of inner magnetic ring 236. The vehicle ECU precisely controls this number of revolutions, enabling the tailgate, gull-wing door, and side door to be memorized for their opening height and angle. During motor 2 rotation, a hysteresis torque is generated between inner magnetic ring 236 and outer magnetic ring 234, enabling the tailgate, gull-wing door, and side door to self-lock when in their open state.

[0040] The above-mentioned end cover 233 is provided with multiple positioning bosses 2335 on the left side of the inner hole 2331 and multiple positioning bosses 2336 on the right side, and an annular boss 2332 is provided at the left end of the inner hole 2331 and an annular end face 2333 is provided at the right end, which respectively cooperate with the positioning groove 2346 provided on the left side and the positioning groove 2345 provided on the right side of the outer circular surface 2344 of the outer magnetic ring 234 and the left end face 2341 and the right end face 2343 of the outer magnetic ring 234, which can better prevent the outer magnetic ring 234 from rotating and moving axially due to the action of the hysteresis torque, so that it is fixed on the end cover 233 more firmly and reliably.

[0041] The above-mentioned iron core 235 is provided with multiple symmetrically distributed flattened positions 2351 on the outer circular surface 2352, which respectively cooperate with multiple symmetrically distributed flattened positions 2363 provided on the inner hole 2362 of the inner magnetic ring 236, which can better prevent the inner magnetic ring 236 from rotating relative to the iron core 235 due to the action of hysteresis torque.

[0042] The outer cylindrical surface 2352 of the iron core 235 and the inner hole 2362 of the inner magnetic ring 236 are coated with glue to better prevent the inner magnetic ring 236 from axially moving relative to the iron core 235.

[0043] The inner hole 2353 of the iron core 235 is press-fitted with the motor shaft 122 and coated with glue, which can better prevent the iron core 235 from rotating or moving axially relative to the motor shaft 122.

[0044] Under the premise of ensuring that the magnetization process can be implemented, the above-mentioned inner magnetic ring 236 has as many magnetic poles as possible, so that the motor 2 can run more smoothly after the hysteresis torque is generated between the inner magnetic ring 236 and the outer magnetic ring 234, and the vehicle ECU can control the number of motor rotations with higher accuracy.

[0045] The inner hole 2353 of the iron core 235 is provided with an interference fit with the motor shaft 122 to prevent the iron core 235 from rotating or moving axially relative to the motor shaft 221 .

[0046] The better the uniformity of the magnetic pole spacing angle is ensured by magnetizing the inner magnetic ring 236, the more consistent the hysteresis torque generated between the inner magnetic ring 236 and the outer magnetic ring 234 can be, and the motor 2 can run more smoothly.

[0047] The outer magnetic ring 234 is made of isotropic non-oriented magnetic material. Under the same specifications and dimensions, the higher the remanence Br of the material used, the smaller the coercive force Hcj, and the better the effect of generating hysteresis torque.

[0048] The inner magnetic ring 236 is made of permanent magnetic material. Under the same specifications and dimensions, the higher the residual magnetism Br of the material used, the better the effect of generating hysteresis torque.

[0049] The iron core 235 is made of magnetically conductive material. Under the same specifications and dimensions, the higher the magnetic permeability μ of the material used, the better the effect of generating the hysteresis torque.

Claims

1. A motor with integrated signal collector and hysteresis device, comprising a motor and a cover assembly, characterized in that: The cover assembly includes a coaxially arranged cover, a circuit board assembly, an end cover, an outer magnetic ring, an inner magnetic ring and an iron core. One side of the cover is fixed to the housing of the motor. Two spaced Hall sensing elements are arranged on the end face of the printed circuit board of the printed circuit board assembly. The center of the printed circuit board is fixed to the motor shaft, and the outer ring is fixed to the cover. The iron core is arranged opposite to the printed circuit board, and the center of the iron core is fixed to the motor shaft. The inner magnetic ring is fixed to the outer circumferential surface of the iron core through an inner hole. The outer circumferential surface of the inner magnetic ring is alternately arranged with N poles and S poles. The outer magnetic ring is sleeved outside the inner magnetic ring and an air gap is formed between the two. The outer magnetic ring is fixed to the inner wall of the end cover, and the inner side of the end cover is fixed to the other side of the cover. During the rotation of the motor, the two Hall elements detect the number of rotations of the motor by sensing the N poles and S poles alternately arranged on the outer circumferential surface of the inner magnetic ring, and a hysteresis torque is generated between the inner magnetic ring and the outer magnetic ring.

2. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The outer magnetic ring and the end cover are integrally formed by insert injection molding.

3. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The end cover is provided with a plurality of positioning bosses on the left and right sides of the inner hole, and an annular boss is provided at the left end of the inner hole and an annular end face is provided at the right end, which respectively cooperate with the positioning grooves provided on the left and right sides of the outer circular surface of the outer magnetic ring and the left end face and right end face of the outer magnetic ring.

4. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The iron core is provided with a plurality of symmetrically distributed flattened positions on the outer circumferential surface, which are respectively matched with a plurality of symmetrically distributed flattened positions provided on the inner hole of the inner magnetic ring.

5. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: Glue is applied at the fitting position between the outer cylindrical surface of the iron core and the inner hole of the inner magnetic ring.

6. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The inner hole of the iron core is arranged in an interference fit with the motor shaft.

7. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The inner hole of the iron core is arranged in an interference fit with the motor shaft.

8. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The outer magnetic ring is made of isotropic non-oriented magnetic material.

9. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The inner magnetic ring is made of permanent magnetic material.

10. The motor with integrated signal collector and hysteresis device as claimed in claim 1, characterized in that: The motor shaft is symmetrically arranged with flattened portions at the iron core installation position, and the inner hole of the iron core is also symmetrically arranged with flattened portions.

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