Aviation permanent magnet synchronous motor

Abstract

The invention relates to an aviation permanent magnet synchronous motor which comprises a rear cover assembly, a shell assembly, a front cover assembly, a rotor assembly, a bearing assembly and a wave spring, the rear cover assembly comprises a rear steel sleeve, a rear end cover and a slotted countersunk head screw, the rear steel sleeve and the rear end cover are pressed in an interference fit mode, and drilling holes are formed in the circumferential fit position of the rear end cover and the rear steel sleeve. The rear cover assembly is provided with a crimping terminal, a wire is led out of the rear cover assembly through the crimping terminal, the wire is installed on a tail accessory fixed to the end of the rear cover assembly, and the shell assembly comprises a stator body, a shell body, a front steel sleeve, a steel wire thread insert and a connecting key. In conclusion, the motor has the advantages that the structure is simple, the shielding effect is good, the motor adapts to complex environments, the production efficiency is high, and the power can meet the requirements of a brake motor.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation motors, and in particular relates to an aviation permanent magnet synchronous motor. Background Art

[0002] Aircraft may use brakes frequently during long-distance taxiing, which may cause the brake device to overheat. In severe cases, it may cause the fan brake device to catch fire. Usually, a brake cooling fan is required for cooling. The brake cooling fan is composed of a brake drive motor and fan blades. Compared with other motors, the brake drive motor not only needs to be resistant to high temperatures, but also prevent sand or splashing water from entering the brake drive motor during braking. It also has a shielding function. However, the existing brake motors are not only complex in structure, but also inconvenient to process, produce and assemble, and their size, power and speed cannot meet existing needs. Therefore, an aviation permanent magnet synchronous motor is urgently needed to solve the above-mentioned problems. Summary of the invention

[0003] In view of this, the present invention proposes an aviation permanent magnet synchronous motor, which is applied to the field of aviation motor technology to solve the existing technical problems of high temperature resistance, complex structure, inconvenient production, poor shielding effect and output power that cannot meet the demand.

[0004] In order to achieve the above technical objectives, the specific technical solutions adopted by the present invention are:

[0005] An aviation permanent magnet synchronous motor comprises a rear cover assembly, a shell assembly, a front cover assembly, a rotor assembly, a bearing assembly and a wave spring. The rear cover assembly comprises a rear steel sleeve, a rear end cover and a slotted countersunk screw. The rear steel sleeve and the rear end cover are press-fitted by interference fit. The circumferential fit between the rear end cover and the rear steel sleeve is provided with drilled holes. The slotted countersunk screw is installed in the corresponding drilled holes. A crimping terminal is provided on the rear cover assembly. The rear cover assembly leads out a wire through the crimping terminal. The wire is installed on a tail attachment fixed to the end of the rear cover assembly. The shell assembly comprises a stator body, a shell body, a front steel sleeve, a wire screw sleeve and a connecting key. The stator body is heated and press-fitted in the shell body. A bearing end cover locking structure is provided on the front cover assembly. The bearing end cover locking structure comprises a rolling body, a raceway, a bearing cover and a locking nut. Elastic contact is formed at the contact between the rolling body and the raceway. A labyrinth structure is provided between the bearing cover and the locking nut to prevent sand, dust and splashing water from directly entering the interior of the motor.

[0006] Furthermore, the rotor assembly includes a rotating shaft, a magnet, a rotor sleeve, a rotor core, a first dynamic balancing ring and a second dynamic balancing ring. The first dynamic balancing ring and the second dynamic balancing ring are assembled with the rotor core through transition fit, and the connection tightness is improved by laser welding. The rotor core and the rotor sleeve adopt an integrated design. The mounting surface of the magnet and the rotating shaft are processed using the same reference. The magnet is directly mounted on the surface of the rotor core. The rotor sleeve is fixed to the outer ring of the magnet to fix the magnet. The first dynamic balancing ring and the second dynamic balancing ring are respectively located on both sides of the axial direction of the rotor core to further fix the magnet.

[0007] Furthermore, the rotating shaft includes a first shaft body, a second shaft body and a cylindrical pin. The first shaft body and the second shaft body are assembled into the rotating shaft through separate processing. The first shaft body and the second shaft body are interference fit and fixed with the cylindrical pin.

[0008] Furthermore, the connection key is installed inside the shell body before the stator body is press-fitted during the processing. The shell body is made of aluminum alloy, and a weight-reducing groove is arranged outside the shell body.

[0009] Furthermore, the outer ring of the shell body is provided with a wire screw sleeve and a slotted cone-end locking screw, the wire screw sleeve extends into the end face of the shell body in the axial direction, and the slotted cone-end locking screw extends into the outer ring side wall of the shell body in the radial direction. The axial position of the stator body and the slotted cone-end locking screw is the same, so that the stator body is axially compressed and fixed by the slotted cone-end locking screw.

[0010] Furthermore, the stator body includes winding coils, slot wedges, stator end pieces and a stator core. The stator core is made by laminating stator punching sheets, fastening them by laser welding and then bonding insulating end pieces at the ends.

[0011] Furthermore, the winding coil is arranged around the stator core, the stator end piece is arranged between the winding coil and the stator core, and the slot wedge is arranged inside the stator core to fix the stator core.

[0012] Furthermore, the outer diameter of the stator core is 51 mm, the inner diameter is 31.5 mm, and the core length is 30 mm. The stator punching sheet includes a stator punching sheet slot and a laser welding slot. The number of the stator punching sheet slots is fifteen, and they are evenly distributed in a ring shape. The shape of the stator punching sheet slot is a pear-shaped slot with an oblique shoulder, wherein the slot width of the stator punching sheet slot is 1.2 mm, the slot height is 0.65 mm, the slot shoulder width is 3.5 mm, the slot shoulder height is 0.70 mm, the slot depth is 8 mm, and the slot bottom radius is 0.8 mm. The outer ring of the stator punching sheet slot is provided with a laser welding slot, and the laser welding slot is fixed on the circumscribed circumferential line of the stator punching sheet slot by laser welding.

[0013] Furthermore, the front cover assembly includes a front end cover and a front steel sleeve. The front steel sleeve is arranged inside the front end cover, and the front steel sleeve is also matched and connected with the front steel sleeve through slotted countersunk screws.

[0014] Furthermore, the magnetic steel adopts SmCo30H magnetic steel, which can withstand high temperatures of 300°C, thereby increasing the high temperature resistance of the motor.

[0015] By adopting the above technical solution, the present invention can also bring the following beneficial effects:

[0016] 1. The present invention mentions an aviation permanent magnet synchronous motor, which has crimped terminals installed by machined threads on a rear cover assembly, and the lead wires are installed on the tail accessories, so that the motor has a good shielding function. In order to reduce the weight of the product, the shell assembly is made of aluminum alloy material and a weight reduction groove is processed on the outside of the shell assembly. A bearing end cover locking structure is used on the front cover assembly. This structure can form an elastic contact between the rolling element and the raceway, similar to a spring. The stiffness can be improved after increasing the preload. A maze structure is formed between the bearing cover and the locking nut, so that sand, dust and splashing water cannot directly enter the interior of the motor. It has the advantages of simple structure, good shielding effect and adaptability to complex environments.

[0017] 2. The present invention mentions an aviation permanent magnet synchronous motor, in which the rotating shaft is processed in parts, and then an interference fit is used and fixed by riveting with cylindrical pins. This structure reduces the difficulty of processing the long shaft, while also ensuring the coaxiality of the parts. The rotating shaft and the rotor sleeve are designed in an integrated manner, and the magnetic steel mounting surface and the rotating shaft are processed using the same reference. The magnetic steel is directly mounted on the surface of the rotating shaft, which simplifies the production process, improves processability, and has the advantages of high production efficiency and power that can meet the needs of brake motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The present invention provides a structural schematic diagram of an aviation permanent magnet synchronous motor;

[0020] Figure 2 It is a structural schematic diagram of a rear cover assembly in a specific embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a housing assembly in a specific embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a stator body in a specific embodiment of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a rotor assembly in a specific embodiment of the present invention;

[0024] Figure 6 It is a structural schematic diagram of a stator punching slot in a specific embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the rotor core in a specific embodiment of the present invention;

[0026] Figure 8 It is a structural schematic diagram of a front cover assembly in a specific embodiment of the present invention;

[0027] Among them: 1. rotor assembly; 2. front cover assembly; 3. housing assembly; 4. bearing assembly; 5. ball bearing disc spring bearing; 6. rear cover assembly; 7. sensor assembly; 8. socket; 11. shaft; 12. first dynamic balance ring; 13. rotor sleeve; 14. magnet; 15. rotor core; 16. second dynamic balance ring; 21. front cover; 22. slotted countersunk screw; 23. front steel sleeve; 21. front cover; 22. slotted countersunk screw; 23. front steel sleeve; 21. front cover; 22. slotted countersunk screw; 24. Slotted countersunk screw; 23, front steel sleeve; 21, front end cover; 22, slotted countersunk screw; 23, front steel sleeve; 31, wire screw sleeve; 32, housing body; 33, slotted cone-end set screw; 34, stator body; 35, stator punching slot; 41, front bearing; 42, rear bearing; 61, rear end cover; 62, rear steel sleeve; 341, winding coil; 342, stator end piece; 343, slot wedge; 344, stator core. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0033] In one embodiment of the present invention, Figures 1 to 8As shown, an aviation permanent magnet synchronous motor includes a rear cover assembly 6, a shell assembly 3, a front cover assembly 2, a rotor assembly 1, a bearing assembly 4 and a wave spring. The rear cover assembly 6 includes a rear steel sleeve 62, a rear end cover 61 and a slotted countersunk screw 22. The rear steel sleeve 62 and the rear end cover 61 are press-fitted by interference fit. The circumferential fitting position of the rear end cover 61 and the rear steel sleeve 62 is provided with drilled holes. The slotted countersunk screw 22 is installed in the corresponding drilled holes. A crimping terminal is provided on the rear cover assembly 6. The rear cover assembly 6 leads out a wire through the crimping terminal. The wire is installed on the tail attachment fixed to the end of the rear cover assembly 6. A sensor assembly 7 is provided at the outer end of the rear cover assembly 6. A Hall position sensor is provided inside the sensor assembly 7. The shell assembly 3 includes a stator body 34, a shell body 32, a front steel sleeve 23, a wire screw sleeve 31 and a connecting key. The stator body 34 is heated and press-fitted in the shell body 32. The front cover assembly 2 includes a front cover 21 and a front steel sleeve 23. The front steel sleeve 23 is arranged inside the front cover 21. The front steel sleeve 23 is also matched and connected with the front steel sleeve 23 through a slotted countersunk screw 22. The bearing assembly 4 has a front bearing 41 and a rear bearing 42. The end of the rear bearing 42 is provided with a ball bearing disc spring bearing 5. The front cover assembly 2 is provided with a bearing end cover locking structure. The bearing end cover locking structure includes a rolling body, a raceway, a bearing cover and a locking nut. The contact between the rolling body and the raceway forms an elastic contact. A labyrinth structure is provided between the bearing cover and the locking nut to prevent sand, dust and splashing water from directly entering the interior of the motor. The magnetic steel 14 adopts SmCo30H magnetic steel 14, which can withstand a high temperature of 300°C and increase the high temperature resistance of the motor; two sockets 8 are provided on the outer side of one end of the rotor assembly 1 close to the rear cover assembly 6, which are connected to the outer power supply through the socket 8, and the rear cover assembly 6 is also connected to the socket 8 through the wire of the crimping terminal.

[0034] The rotor assembly 1 includes a rotating shaft 11, a magnetic steel 14, a rotor sleeve 13, a rotor core 15, a first dynamic balancing ring 12 and a second dynamic balancing ring 16. The first dynamic balancing ring 12 and the second dynamic balancing ring 16 are assembled with the rotor core 15 through transition fit, and the connection tightness is improved by laser welding. The rotor core 15 and the rotor sleeve 13 adopt an integrated design. The mounting surface of the magnetic steel 14 and the rotating shaft 11 are processed using the same reference. The magnetic steel 14 is directly mounted on the surface of the rotor core 15. The rotor sleeve 13 is fixed to the outer ring of the magnetic steel 14 to fix the magnetic steel 14. The first dynamic balancing ring 12 and the second dynamic balancing ring 16 are respectively located on both sides of the axial direction of the rotor core 15 to further fix the magnetic steel 14.

[0035] The rotating shaft 11 includes a first shaft body, a second shaft body and a cylindrical pin. The first shaft body and the second shaft body are assembled into the rotating shaft 11 by separate processing. The first shaft body and the second shaft body are interference fit and fixed by the cylindrical pin. The connecting key is installed inside the shell body 32 before the stator body 34 is pressed during the processing. The shell body 32 is made of aluminum alloy, and a weight reduction groove is arranged on the outside of the shell body 32.

[0036] The outer ring of the shell body 32 is provided with a wire thread sleeve 31 and a slotted cone-end set screw 33. The wire thread sleeve 31 extends into the end surface of the shell body 32 in the axial direction, and the slotted cone-end set screw 33 extends into the outer ring side wall of the shell body 32 in the radial direction. The axial position of the stator body 34 and the slotted cone-end set screw 33 is the same, so that the stator body 34 is axially compressed and fixed by the slotted cone-end set screw 33.

[0037] The stator body 34 includes a winding coil 341, a slot wedge 343, a stator end piece 342 and a stator core 344. The stator core 344 is made by laminating stator punching sheets, fastening them by laser welding, and then bonding insulating end pieces at the ends. The winding coil 341 is arranged around the stator core 344, the stator end piece 342 is arranged between the winding coil 341 and the stator core 344, and the slot wedge 343 is arranged inside the stator core 344 to fix the stator core 344. The outer diameter of the stator core 344 is 51mm, the inner diameter is 31.5mm, and the core length is 30mm. The stator punching sheet includes a stator punching sheet slot 35 and a laser welding slot. The number of the stator punching sheet slots 35 is fifteen, and they are evenly distributed in a ring shape. The shape of the stator punching sheet slot 35 is an oblique shoulder pear-shaped slot, wherein the stator punching sheet slot 35 has a slot width of 1.2mm, a slot height of 0.65mm, a slot shoulder width of 3.5mm, a slot shoulder height of 0.70mm, a slot depth of 8mm, and a slot bottom radius of 0.8mm. The outer ring of the stator punching sheet slot 35 is provided with a laser welding slot, and the laser welding slot is fixed on the circumscribed circumference of the stator punching sheet slot 35 by laser welding.

[0038] During use of the present invention, a phase of the stator body 34 is energized, and the current interacts with the magnetic field generated by the permanent magnet to generate an electromagnetic torque. The rotor assembly 1 rotates under the action of the torque, and the rotation of the rotor assembly 1 drives the magnetic ring of the Hall position sensor arranged in the sensor assembly 7 to rotate. The Hall position sensor converts the position of the magnetic ring into high and low level signals. The controller controls the winding coil 341 to be turned on in a certain order according to the electrical signal to realize the control of the motor. In short, the present invention has the advantages of simple structure, good shielding effect, adaptability to complex environment, high production efficiency and power that can meet the needs of brake motors.

[0039] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An aviation permanent magnet synchronous motor, characterized in that: The invention comprises a rear cover assembly (6), a housing assembly (3), a front cover assembly (2), a rotor assembly (1), a bearing assembly (4) and a wave spring. The rear cover assembly (6) comprises a rear steel sleeve (62), a rear end cover (61) and a slotted countersunk screw (22). The rear steel sleeve (62) and the rear end cover (61) are press-fitted by interference fit. A drilled hole is provided at the circumferential fitting position of the rear end cover (61) and the rear steel sleeve (62). The slotted countersunk screw (22) is installed in the corresponding drilled hole. A crimping terminal is provided on the rear cover assembly (6). The rear cover assembly (6) leads out a wire through the crimping terminal. The wire is installed on the tail attachment fixed to the end of the rear cover assembly (6). The housing assembly (3) includes a stator body (34), an outer shell body (32), a front steel sleeve (23), a wire screw sleeve (31) and a connecting key. The stator body (34) is heated and pressed into the outer shell body (32). The front cover assembly (2) is provided with a bearing end cover locking structure. The bearing end cover locking structure includes a rolling body, a raceway, a bearing cover and a locking nut. The rolling body forms an elastic contact with the raceway. A labyrinth structure is provided between the bearing cover and the locking nut to prevent sand, dust and splashing water from directly entering the interior of the motor.

2. The aviation permanent magnet synchronous motor according to claim 1, characterized in that: The rotor assembly (1) comprises a rotating shaft (11), a magnetic steel (14), a rotor sleeve (13), a rotor core (15), a first dynamic balancing ring (12) and a second dynamic balancing ring (16); the first dynamic balancing ring (12) and the second dynamic balancing ring (16) are assembled with the rotor core (15) by transition fit, and the connection tightness is improved by laser welding; the rotor core (15) and the rotor sleeve (13) are designed as an integrated whole; the mounting surface of the magnetic steel (14) and the rotating shaft (11) are processed by the same reference; the magnetic steel (14) is directly mounted on the surface of the rotor core (15); the rotor sleeve (13) is fixed to the outer ring of the magnetic steel (14) to fix the magnetic steel (14); the first dynamic balancing ring (12) and the second dynamic balancing ring (16) are respectively located on both sides of the axial direction of the rotor core (15) to further fix the magnetic steel (14).

3. The aviation permanent magnet synchronous motor according to claim 2, characterized in that: The rotating shaft (11) comprises a first shaft body, a second shaft body and a cylindrical pin. The first shaft body and the second shaft body are assembled into the rotating shaft (11) by separate processing. The first shaft body and the second shaft body are interference fit and fixed by the cylindrical pin.

4. The aviation permanent magnet synchronous motor according to claim 3, characterized in that: The connection key is installed inside the shell body (32) before the stator body (34) is pressed during the processing. The shell body (32) is made of aluminum alloy, and a weight-reducing groove is arranged outside the shell body (32).

5. The aviation permanent magnet synchronous motor according to claim 4, characterized in that: The outer ring of the shell body (32) is provided with a wire screw sleeve (31) and a slotted cone-end set screw (33); the wire screw sleeve (31) extends into the end surface of the shell body (32) in the axial direction; the slotted cone-end set screw (33) extends into the outer ring side wall of the shell body (32) in the radial direction; the stator body (34) and the slotted cone-end set screw (33) have the same axial position, so that the stator body (34) is axially compressed and fixed by the slotted cone-end set screw (33).

6. The aviation permanent magnet synchronous motor according to claim 5, characterized in that: The stator body (34) comprises a winding coil (341), a slot wedge (343), a stator end piece (342) and a stator core (344). The stator core (344) is made by laminating stator punching sheets, fastening them by laser welding, and then bonding insulating end pieces at the end.

7. The aviation permanent magnet synchronous motor according to claim 6, characterized in that: The winding coil (341) is arranged around the stator core (344), the stator end piece (342) is arranged between the winding coil (341) and the stator core (344), and the slot wedge (343) is arranged inside the stator core (344) to fix the stator core (344).

8. The aviation permanent magnet synchronous motor according to claim 7, characterized in that: The stator core (344) has an outer diameter of 51 mm, an inner diameter of 31.5 mm, and a core length of 30 mm. The stator punching sheet comprises a stator punching sheet slot (35) and a laser welding slot. The number of the stator punching sheet slots (35) is fifteen and they are evenly distributed in a ring shape. The shape of the stator punching sheet slot (35) is an oblique shoulder pear-shaped slot, wherein the stator punching sheet slot (35) has a slot width of 1.2 mm, a slot height of 0.65 mm, a slot shoulder width of 3.5 mm, a slot shoulder height of 0.70 mm, a slot depth of 8 mm, and a slot bottom fillet of 0.8 mm. The outer ring of the stator punching sheet slot (35) is provided with a laser welding slot, and the laser welding slot is fixed on the circumference of the stator punching sheet slot (35) by laser welding.

9. The aviation permanent magnet synchronous motor according to claim 8, characterized in that: The front cover assembly (2) comprises a front end cover (21) and a front steel sleeve (23). The front steel sleeve (23) is arranged inside the front end cover (21). The front steel sleeve (23) is also matched and connected to the front steel sleeve (23) by means of slotted countersunk screws (22).

10. The aviation permanent magnet synchronous motor according to claim 9, characterized in that: The magnetic steel (14) is made of SmCo30H magnetic steel (14), which can withstand a high temperature of 300° C., thereby increasing the high temperature resistance of the motor.

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