Axial flux three-phase asynchronous brake motor

Abstract

The utility model discloses an axial magnetic flux three-phase asynchronous brake motor, which comprises a housing, a stator and a rotor, wherein the stator and the rotor are arranged in the housing and are oppositely distributed; the rotor comprises a rotating shaft and a rotor iron core arranged on the rotating shaft; a bearing seat is arranged at the front end of the housing; the bearing seat is arranged on the rotating shaft in a sleeving manner, and a deep groove ball bearing A, a deep groove ball bearing B and a plane thrust bearing are sequentially arranged between the bearing seat and the rotating shaft; a T-shaped bracket is arranged between the bearing seat and the housing and comprises a longitudinal mounting part and a transverse mounting part; the longitudinal mounting part is arranged at the rear end of the rotating shaft in a sleeving manner, and a spring is arranged outside the longitudinal mounting part in a sleeving manner; the transverse installation part abuts against the rear end face of the rotor iron core, and a brake disc is fixed to the rear end face of the transverse installation part. When the motor is powered on, the brake disc is separated from the housing under the action of magnetic force, the rotating shaft rotates normally, and the spring is in a compressed state; when the motor is powered off, the brake disc abuts against the inner wall of the housing under the action of the elastic force of the spring to form braking.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of axial flux motor, concretely relates to an axial flux three-phase asynchronous brake motor. BACKGROUND

[0002] Axial flux motor (also known as "disc motor") is a novel structure, high-tech new generation of motor, its magnetic flux path is different from ordinary radial motor, air gap is planar, air gap magnetic field magnetic flux direction is parallel to motor axis direction. The core technical advantage of axial flux motor is that the rotating rotor is located on the side of the stator (not inside the stator), so that the rotor has a larger diameter size, and torque = force x force arm (radius), so that higher torque output can be obtained under the action of the same force. This means that under the premise of providing the same permanent magnet material and copper wire material, higher torque output can be obtained. The design of the new type of axial flux motor can improve the torque density by more than 30% than the design of the traditional radial flux motor. Due to the technical characteristics of short axial size, compact structure, flat and ultra-thin, small volume, etc., axial flux motor has been gradually applied to electric vehicles, airport pods, punch equipment, hoisting equipment and other application scenarios in recent years.

[0003] At present, in the field of automobile electric drive using permanent magnet synchronous motor or induction motor, the traditional radial flux motor is widely developed for weight and cost optimization, but the space for further improvement of the technical level is very limited. In order to meet the engineering needs, the radial flux motor needs to be attached with a brake to realize the rapid braking of the motor when the power is off. At present, in the configuration of the traditional radial flux motor, the brake is usually arranged outside the motor housing, including the brake coil, the brake housing, the armature, the brake assembly, etc., which increases the size and weight of the motor, making the axial size of the radial flux brake motor particularly long, which cannot be applied in many occasions. Therefore, it is necessary to design an axial flux brake motor of a completely different motor type. SUMMARY

[0004] The utility model provides a kind of axial flux three-phase asynchronous brake motor, to overcome the above-mentioned problems existing in prior art.The axial flux three-phase asynchronous brake motor of the utility model, rotor and stator face-to-face relative arrangement, the air gap magnetic field of motor is axial;It is installed T-shaped support on the rear end face of rotor iron core, and brake disc and spring are installed on the support, can utilize the axial electromagnetic attraction of motor when energization, make brake disc overcome the resistance of spring, separate from shell, motor normal work;When power off, utilize the spring force effect, make brake disc slide to the direction of shell, and form friction resistance with shell inner wall, generate a brake torque to overcome the inertia of rotor, make the rotor of motor instantaneous stop rotation;At this time, it is not necessary to additionally set brake, effectively reduce the size and weight of motor.

[0005] The technical scheme of the present application is: an axial flux three-phase asynchronous brake motor, comprising a housing, a stator and a rotor arranged opposite to each other in the housing; the rotor comprises a shaft and a rotor iron core arranged on the shaft; the front end of the housing is provided with a bearing seat; the bearing seat is sleeved on the shaft, and A deep groove ball bearing, B deep groove ball bearing and a plane thrust bearing are sequentially arranged between the bearing seat and the shaft; a bracket is arranged between the bearing seat and the housing; the bracket is T-shaped, comprising a longitudinal mounting portion and a transverse mounting portion; the longitudinal mounting portion is sleeved on the rear end of the shaft, and a spring is sleeved on the longitudinal mounting portion; the transverse mounting portion abuts against the rear end face of the rotor iron core, and a brake disc is fixed on the rear end face of the transverse mounting portion.

[0006] When the motor is energized, the brake disc separates from the shell under the action of magnetic force, the shaft rotates normally, and the spring is in a compressed state; when the motor is powered off, the brake disc abuts against the inner wall of the shell under the action of the spring force, forming a brake.

[0007] Compared with the prior art, in the axial flux three-phase asynchronous brake motor of the application, the rotor and the stator are arranged face to face, and the air gap magnetic field of the motor is axial; a T-shaped support is arranged on the rear end surface of the rotor core, and a brake disc and a spring are arranged on the support to form a brake structure, so that the brake disc can be separated from the housing by the axial electromagnetic attraction of the motor to make the motor work normally when power is on; when power is off, the brake disc slides to the housing by the elastic force of the spring, and a frictional resistance is formed between the brake disc and the inner wall of the housing to generate a brake torque to overcome the inertia of the rotor, so that the rotor of the motor is stopped instantaneously; at this time, no additional brake is needed, and the whole brake structure is designed reasonably and occupies a small space, effectively reducing the size and weight of the motor. In addition, the axial flux three-phase asynchronous brake motor of the application adopts a special three-bearing structure, two deep groove ball bearings are axially positioned to overcome the radial force of the motor load, and a plane thrust bearing bears the axial force and magnetic pull, so that the structure of the motor is more stable, and the operation reliability is high; in actual use, different brake requirements and brake modes can be customized according to the requirements of equipment operation to achieve the purpose of braking the motor within a specified time.

[0008] As an optimization, in the aforementioned axial flux three-phase asynchronous brake motor, an adjusting washer is sleeved between the plane thrust bearing and the longitudinal mounting portion on the shaft; one end of the spring abuts against the adjusting washer, and the other end abuts against the transverse mounting portion. The adjusting washer can adjust the relative position between the plane thrust bearing and the support, thereby ensuring the normal operation of the rotor; in addition, the adjusting washer can also pre-apply an axial load after being arranged, thereby improving the rigidity of the bearing and preventing resonance and bearing slip of the motor.

[0009] As an optimization, in the aforementioned axial flux three-phase asynchronous brake motor, the stator is formed by punching and rolling stator laminations, and the rotor core is formed by punching and rolling rotor laminations. The stator and the rotor core are prepared by punching and rolling process, and the material utilization rate can be as high as 86% or more, which is much higher than the utilization rate of 72% of the conventional lamination process, thereby reducing manufacturing consumables. Moreover, after the punching and rolling is completed, the head and tail ends can be welded, which is simple to operate and easy to implement. Further, a group of inclined slots are arranged on the rotor core in a circumferential direction. In this way, the startability of the motor can be improved, and harmonics and noise can be reduced. The angle of the inclined slots can be set according to design requirements.

[0010] As an optimization, in the aforementioned axial flux three-phase asynchronous brake motor, an end ring is arranged on the outer circumferential surface of the rotor core; and a group of balance columns are arranged on the end ring in a circumferential direction. The balance columns can improve the dynamic balance performance of the rotor, so that the rotor is more stable and has less noise when rotating at high speed, thereby prolonging the service life of the motor.

[0011] As optimization, the axial flux three-phase asynchronous brake motor, the brake disc, the transverse mounting portion and the rotor core are fixed as a whole by bolts.

[0012] As optimization, the axial flux three-phase asynchronous brake motor, the inner wall of the bearing seat is provided with a limiting boss; the A deep groove ball bearing, the B deep groove ball bearing and the plane thrust bearing are in abutment with the assembly surface of the corresponding limiting boss. The limiting boss can play a positioning role, making the assembly more convenient, and can also limit the three bearings, avoiding the position of the bearings from deviating when the rotor rotates. Further, the shaft sleeve is arranged between the A deep groove ball bearing and the B deep groove ball bearing on the shaft.

[0013] As optimization, the axial flux three-phase asynchronous brake motor, the front end of the bearing seat, located outside the A deep groove ball bearing, is provided with a bearing cover. At this time, a sealing structure can be formed on the outside of the bearing seat to avoid the entry of dust and water from the outside and damage the bearing.

[0014] As optimization, the axial flux three-phase asynchronous brake motor, the shaft is connected with the longitudinal mounting portion through a key; and the bearing seat is fixed with the shell through bolts. At this time, the structure is simple and convenient to install. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the axial flux three-phase asynchronous brake motor of the present application;

[0016] Figure 2 is a structural schematic diagram of the rotor core in the embodiment of the present application;

[0017] Figure 3 is a side view of the rotor core in Figure 2 ;

[0018] Figure 4 is a schematic diagram of the brake structure in the embodiment of the present application;

[0019] Figure 5 is a sectional view of the brake structure in Figure 4 ;

[0020] Figure 6 is a schematic diagram of the bearing seat in the embodiment of the present application.

[0021] The marks in the drawings are: 1 - cover; 2 - stator; 3 - rotating shaft; 4 - rotor core, 401 - inclined slot, 402 - end ring, 403 - balance column, 404 - fan blade; 5 - bearing seat, 501 - limiting boss; 6 - A deep groove ball bearing; 7 - B deep groove ball bearing; 8 - flat thrust bearing; 9 - bracket, 901 - longitudinal mounting part, 902 - transverse mounting part; 10 - spring; 11 - brake disc; 12 - adjusting washer; 13 - bolt; 14 - shaft sleeve; 15 - bearing cover. DETAILED DESCRIPTION

[0022] The application will be further described below in conjunction with the drawings and examples.

[0023] In order to overcome the problem that the axial size of the conventional radial magnetic flux brake motor is particularly long and many occasions cannot be used, the application provides an axial magnetic flux three-phase asynchronous brake motor, a brake disc 11 is installed on the rear end surface of the rotor core 4, and a spring 10 is sleeved on the rotating shaft 3; through the cooperation of the spring 10 and the brake disc 11, a brake torque can be generated to overcome the inertia of the rotor when power is off, so that the rotor of the motor stops rotating instantaneously. Specifically as follows:

[0024] Referring to Figure 1 In the embodiment, the axial magnetic flux three-phase asynchronous brake motor comprises a cover 1, and a stator 2 and a rotor (the stator 2 and the rotor are respectively composed of disc type cores) oppositely distributed in the cover 1; the rotor comprises a rotating shaft 3 and a rotor core 4 arranged on the rotating shaft 3; the front end of the cover 1 is provided with a bearing seat 5; the bearing seat 5 is sleeved on the rotating shaft 3, and the bearing seat 5 and the rotating shaft 3 are sequentially provided with an A deep groove ball bearing 6, a B deep groove ball bearing 7 and a flat thrust bearing 8 (the flat thrust bearing 8 can bear a larger axial thrust, and the two deep groove ball bearings bear a relatively small axial force); the bearing seat 5 and the cover 1 are provided with a bracket 9; the bracket 9 is T-shaped and comprises a longitudinal mounting part 901 and a transverse mounting part 902; the longitudinal mounting part 901 is sleeved on the rear end of the rotating shaft 3, and the longitudinal mounting part 901 is externally sleeved with a spring 10; the rear end surface of the transverse mounting part 902 abuts against the rear end surface of the rotor core 4, and the rear end surface of the transverse mounting part 902 is fixed with a brake disc 11; at this time, the bracket 9, the spring 10 and the rotor core 4 cooperate to form a brake structure; when the motor is powered on, the brake disc 11 is separated from the cover 1 under the action of magnetic force, the rotating shaft 3 rotates normally, and the spring 10 is in a compressed state; when the motor is powered off, the brake disc 11 abuts against the inner wall of the cover 1 under the action of the elastic force of the spring 10, and a brake is formed.

[0025] In the embodiment, the adjusting washer 12 is sleeved on the rotating shaft 3 between the planar thrust bearing 8 and the longitudinal mounting portion 901; one end of the spring 10 abuts against the adjusting washer 12, and the other end abuts against the transverse mounting portion 902. The adjusting washer 12 can adjust the relative position between the planar thrust bearing 8 and the bracket 9, thereby ensuring the normal operation of the rotor; in addition, the adjusting washer 12 can also pre-apply an axial load, improve the rigidity of the bearing, and prevent the motor from resonating and the bearing from slipping.

[0026] In the embodiment, the stator 2 and the rotor core 4 are respectively formed by punching and rolling a silicon steel sheet. The stator 2 and the rotor core 4 are prepared by the punching and rolling process, and the material utilization rate can be as high as 86% or more, which is much higher than the utilization rate of 72% of the conventional stacking process, thereby reducing manufacturing consumables. After the punching and rolling is completed, the head and tail ends are welded, which is simple to operate and easy to implement. See Figure 2 and Figure 3 The rotor core 4 is provided with 33 inclined grooves 401 uniformly spaced in the circumferential direction. In this way, the startability of the motor can be improved, and the harmonics and noise can be reduced. The angle of the inclined grooves 401 can be set according to design requirements.

[0027] Referring to Figure 4 In the embodiment, the outer circumferential surface of the rotor core 4 is provided with an end ring 402; the end ring 402 is provided with eight fan blades 404 uniformly spaced in the circumferential direction, and two balance columns 403 are provided between adjacent two fan blades 404. The fan blades 404 can improve the heat dissipation capacity of the rotor, thereby reducing the temperature rise of the motor; the design of the balance columns 403 can improve the dynamic balance performance of the rotor, so that the rotor is more stable and the noise is smaller during high-speed rotation, thereby prolonging the service life of the motor.

[0028] In the embodiment, the brake disc 11, the transverse mounting portion 902 and the rotor core 4 are fixed as a whole by the bolts 13; the bolts 13 pass through the mounting holes of the brake disc 11 and the transverse mounting portion 902 in sequence and are fixed on the rotor core 4. At this time, the assembly is simple and occupies small space. Specifically, the bolts 13 are six and are uniformly distributed in the axial direction.

[0029] Referring to Figure 6 In the embodiment, the inner wall of the bearing seat 5 is provided with a limiting boss 501; the assembly surface of the A deep groove ball bearing 6, the B deep groove ball bearing 7 and the planar thrust bearing 8 abuts against the corresponding limiting boss 501. The limiting boss 501 can play a positioning role, making the assembly more convenient, and can also limit the three bearings, avoiding the displacement of the bearing position when the rotor rotates. Further, the shaft sleeve 14 is arranged on the rotating shaft 3 between the A deep groove ball bearing 7 and the B deep groove ball bearing 8, for limiting the distance between the A deep groove ball bearing 7 and the B deep groove ball bearing 8.

[0030] Generally, the rotating shaft 3 rotates mostly, the dynamic ring of the plane thrust bearing 8 cooperates with the rotating shaft 3 as a transition fit, and the seat ring cooperates with the bearing seat 5 as a clearance fit; the following matters should be noticed when installing the plane thrust ball bearing 8: 1. distinguishing the dynamic ring and the seat ring of the bearing, judging according to the size of the inner diameter of the bearing, the hole diameter difference is (0.1-0.5mm), the inner diameter of the seat ring is larger; 2. distinguishing the stationary part in the motor, i.e. the part that does not move, no matter what the situation is, the seat ring of the bearing should always be on the end face of the stationary part.

[0031] In the embodiment, the front end of the bearing seat 5 is located outside the A deep groove ball bearing 6, and is provided with a bearing cover 15. At this time, a sealing structure can be formed outside the bearing seat 5 to avoid the entry of dust and water from the outside and damage the bearing.

[0032] In the embodiment, the rotating shaft 3 is connected with the longitudinal mounting part 901 through a key, and the bearing seat 5 is fixed with the shell 1 through bolts. At this time, the structure is simple and the installation is convenient.

[0033] The general description of the utility model involved in the present application and the description of the specific embodiments should not be understood as a limitation of the technical solutions of the utility model. According to the disclosure of the present application, the disclosed technical features in the general description or / and the specific embodiments (including examples) can be added, reduced or combined without violating the elements of the utility model involved, to form other technical solutions within the protection scope of the present application.

Claims

1. Axial flux three-phase asynchronous brake motor, characterized in that: The application relates to a motor, which comprises a cover (1), a stator (2) and a rotor oppositely arranged in the cover (1); the rotor comprises a rotating shaft (3) and a rotor core (4) arranged on the rotating shaft (3); the front end of the cover (1) is provided with a bearing seat (5); the bearing seat (5) is sleeved on the rotating shaft (3), and A deep groove ball bearing (6), B deep groove ball bearing (7) and a plane thrust bearing (8) are sequentially arranged between the bearing seat (5) and the rotating shaft (3); a support (9) is arranged between the bearing seat (5) and the cover (1); the support (9) is T-shaped and comprises a longitudinal mounting part (901) and a transverse mounting part (902); the longitudinal mounting part (901) is sleeved on the rear end of the rotating shaft (3), and a spring (10) is sleeved on the longitudinal mounting part (901); the rear end surface of the transverse mounting part (902) is abutted against the rear end surface of the rotor core (4), and a brake disc (11) is fixed on the rear end surface of the transverse mounting part (902).

2. Axial flux three-phase asynchronous braking motor according to claim 1, characterized in that: An adjusting washer (12) is sleeved on the rotating shaft (3) between the plane thrust bearing (8) and the longitudinal mounting part (901); one end of the spring (10) is abutted against the adjusting washer (12), and the other end is abutted against the transverse mounting part (902).

3. The axial flux three-phase asynchronous braking motor of claim 1, wherein: The stator (2) is formed by punching and rolling a stator punching sheet, and the rotor core (4) is formed by punching and rolling a rotor punching sheet; a group of inclined grooves (401) are arranged on the rotor core (4) in a circumferential direction.

4. Axial flux three-phase asynchronous braking motor according to claim 3, characterized in that: An end ring (402) is arranged on the rotor core (4); a group of balance columns (403) are arranged on the end ring (402) in a circumferential direction.

5. The axial flux three-phase asynchronous braking motor of claim 1, wherein: The brake disc (11), the transverse mounting part (902) and the rotor core (4) are fixed as a whole through bolts (13).

6. The axial flux three-phase asynchronous braking motor of claim 1, wherein: Limiting bosses (501) are arranged on the inner wall of the bearing seat (5); the A deep groove ball bearing (6), the B deep groove ball bearing (7) and the plane thrust bearing (8) are abutted against the assembly faces of the corresponding limiting bosses (501).

7. The axial flux three-phase asynchronous braking motor of claim 1, wherein: A shaft sleeve (14) is arranged on the rotating shaft (3) between the A deep groove ball bearing (6) and the B deep groove ball bearing (7).

8. The axial flux three-phase asynchronous braking motor of claim 1, wherein: A bearing cover (15) is arranged on the front end of the bearing seat (5) and located outside the A deep groove ball bearing (6).

9. The axial flux three-phase asynchronous braking motor of claim 1, wherein: The rotating shaft (3) is connected with the longitudinal mounting part (901) through a key.

10. The axial flux three-phase asynchronous braking motor of claim 1, wherein: The bearing seat (5) is fixed with the cover (1) through bolts.

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