Motor capable of reducing reversing noise

Abstract

The utility model discloses a motor capable of reducing commutation noise, which comprises a casing provided with a rear end cover and a front end cover, a Hall commutation component connected with a cable is arranged in the casing, the casing is connected with a stator component and a rotor component provided with a main shaft, and a rear moving block and a magnetic steel pad are mounted on one side of the main shaft close to the rear end cover. A shaft sleeve and a front moving block are installed on the side, close to the front end cover, of the main shaft, a first elastic component located on the periphery of the main shaft is arranged between the rear moving block and the magnetic steel pad, the first elastic component comprises an outer sleeve body abutting against the rear moving block and the magnetic steel pad and a cavity located in an inner cavity of the outer sleeve body, and one end of the shaft sleeve is sleeved with a second elastic component abutting against the front moving block. The second elastic component comprises a solid part which is connected with the shaft sleeve in a sleeving mode and abuts against the shaft sleeve, and a plurality of elastic rings abutting against the front movable block. According to the utility model, only static friction and no sliding friction exist between parts, so that the friction and noise can be reduced, the axial clearance between the parts can be adapted in a larger axial distance range, and the reversing noise of the motor can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor capable of reducing commutation noise. Background Art

[0002] The high-speed drive motors used for system control are mostly permanent magnet brushless DC motors, which have a relatively simple structure. They lack the brushes and commutator used for direct drive motors and are primarily composed of stator components, rotor components, and sensors for commutation. Because there is inevitably a certain amount of axial clearance between the parts assembled on the motor's main shaft, mechanical friction and vibration occur between the parts when the motor switches its rotation direction at high frequencies, generating noticeable commutation noise. Commutation noise exceeding a certain decibel level can directly affect the motor's use case and the effectiveness of certain control systems that require a quiet environment. Therefore, mechanical friction and vibration noise reduction measures must be taken to reduce the mechanical friction and vibration between the parts assembled on the motor's main shaft during motor commutation.

[0003] To reduce noise, some existing motors incorporate shims between the motor spindle components. This gap is adjusted by adding or removing shims and varying their thickness, depending on the size of the gaps between the motor components. However, this approach requires the preparation of multiple shims of varying thickness. Due to the uncertainty of the axial distance between the components, the shims cannot perfectly match the gaps. Furthermore, the number of shims can be easily misplaced during assembly, leading to assembly errors. This can cause a certain amount of axial clearance between the components on the spindle, and can still generate commutation noise during motor operation. Utility Model Content

[0004] In order to solve the technical problems in the prior art that the gaskets cannot completely match the installation gap, the number of gaskets is easily wrong during assembly, resulting in assembly errors, and commutation noise is still generated during high-speed commutation operation of the motor, the present invention provides the following technical solutions.

[0005] The utility model provides a motor that can reduce commutation noise, including a casing provided with a rear end cover and a front end cover, a Hall commutation component connected to a cable being provided in the casing, the casing being connected to a stator component and a rotor component provided with a main shaft, a rear moving block and a magnetic steel pad being installed on the side of the main shaft close to the rear end cover, a shaft sleeve and a front moving block being installed on the side of the main shaft close to the front end cover, a first elastic component located at the outer periphery of the main shaft being provided between the rear moving block and the magnetic steel pad, the first elastic component including an outer sleeve that is tightly pressed against the rear moving block and the magnetic steel pad and a cavity located in the inner cavity of the outer sleeve, a second elastic component that is tightly pressed against the front moving block being provided at one end of the shaft sleeve, the second elastic component including a solid portion that is sleeved and pressed against the shaft sleeve and a plurality of elastic rings that are pressed against the front moving block.

[0006] As a further technical solution, a plurality of elastic balls are evenly arranged in the cavity.

[0007] As a further technical solution, the elastic balls are evenly movably arranged or fixedly arranged along the annular axis of the cavity.

[0008] As a further technical solution, the elastic ball is made of rubber material.

[0009] As a further technical solution, the elastic ring and the solid portion are integrally formed, and an annular cavity is provided between adjacent elastic rings.

[0010] As a further technical solution, a radial connector connected to the adjacent elastic ring is provided in the annular cavity.

[0011] As a further technical solution, the first elastic component and the second elastic component are made of polyurethane elastomer material.

[0012] The beneficial effects of the present invention are as follows: a first elastic component and a second elastic component are respectively installed on both sides of the motor main shaft of the present invention. When assembled between the rear movable block and the magnetic steel pad, and between the shaft sleeve and the front movable block, where installation gaps are easily generated, a compressive elastic force can be generated between the two, thereby reducing the installation gaps between axial parts. When the motor switches forward and reverse at a high frequency, the pre-tensioning force of the first elastic component and the second elastic component is present, so that the installation gap between each axial part is controlled within an appropriate range. That is, although there is no free gap in the axial direction of the motor main shaft, there is a pre-tightening gap. There is only static friction and no sliding friction between the parts, so there is no audible friction or vibration sound. The first elastic component is provided with an outer sleeve, a cavity and an elastic body, and the second elastic component is provided with a solid portion, an elastic ring and a radial support body. These components can accommodate the axial gaps between parts within a large axial distance range, eliminating the need for accurate gaskets of multiple thicknesses. A first elastic component and a second elastic component can ensure the pre-tensioning force between different parts, ensuring the assembly effect and reducing the commutation noise of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional view of an existing motor;

[0014] Figure 2 It is a schematic cross-sectional view of a motor capable of reducing commutation noise according to the utility model;

[0015] Figure 3 This is a schematic cross-sectional view of the rotor component of the motor capable of reducing commutation noise according to the present invention;

[0016] Figure 4 yes Figure 3 A magnified schematic diagram of part A in the middle;

[0017] Figure 5 yes Figure 3 A magnified schematic diagram of part B in the middle;

[0018] In the figure: 1-housing; 101-rear end cover; 102-front end cover; 2-stator component; 3-rotor component; 301-spindle; 302-rear moving block; 303-magnetic steel pad; 304-sleeve; 305-front moving block; 4-Hall commutation component; 5-cable; 6-first elastic component; 601-outer casing; 602-cavity; 603-elastic ball; 7-second elastic component; 701-solid part; 702-elastic ring; 703-annular cavity; 704-radial connector; a301-existing spindle; a302-existing rear moving block; a303-existing magnetic steel pad; a304-existing sleeve; a305-existing front moving block. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0020] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc. are used solely for descriptive purposes and should not be construed to indicate or imply relative importance or implicitly specify the quantity of the technical features referred to. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0021] Figure 1 The figure shows a conventional permanent magnet brushless DC motor. Its rotor assembly includes a conventional main shaft a301, flanked by a conventional rear moving block a302, a conventional magnetic steel washer a303, a conventional shaft sleeve a304, and a conventional front moving block a305. The conventional rear moving block a302 and magnetic steel washer a303, as well as the conventional shaft sleeve a304 and front moving block a305, are susceptible to commutation noise due to installation clearance between the conventional rear moving block a302 and magnetic steel washer a303, and between the conventional shaft sleeve a304 and front moving block a305. The present invention improves upon these issues.

[0022] like Figure 2As shown, the present invention provides a motor capable of reducing commutation noise, comprising a housing 1 having a rear end cover 101 and a front end cover 102. A Hall effect commutation component 4 connected to a cable 5 is disposed within the housing 1. The housing 1 is connected to a stator component 2 and a rotor component 3 having a main shaft 301. A rear moving block 302 and a magnetic steel washer 303 are mounted on the side of the main shaft 301 near the rear end cover 101. A shaft sleeve 304 and a front moving block 305 are mounted on the side of the main shaft 301 near the front end cover 102. All of the above components employ existing structures and are not described in detail herein.

[0023] like Figure 3 As shown, in a preferred embodiment, a first elastic component 6 located on the outer periphery of the main shaft 301 is provided between the rear moving block 302 and the magnetic steel pad 303, and a second elastic component 7 which is tightly pressed against the front moving block 305 is sleeved on one end of the sleeve 304. The first elastic component 6 and the second elastic component 7 can be made of polyurethane elastomer material, or can be made of rubber material or other materials with high wear resistance, high pressure resistance and high elasticity, and the present invention does not impose any special restrictions on them.

[0024] Its working principle is: the first elastic component 6 is assembled between the rear moving block 302 and the magnetic steel pad 303, where installation gaps are easily generated, so that a compressive elastic force can be generated between the two, and the rear moving block 302 and the magnetic steel pad 303 are subjected to a reverse pre-pushing force; the second elastic component 7 is assembled between the shaft sleeve 304 and the front moving block 305, which can also generate a compressive elastic force between the two, and the shaft sleeve 304 and the front moving block 305 are subjected to a reverse pre-pushing force. When the motor rotates in a directional manner at high speed, each part can generate a certain friction force under the action of the pre-pushing force of the first elastic component 6 and the second elastic component 7 respectively, and can respond to the electromagnetic force applied to the main shaft 301 in time. All parts on the rotor component 3 rotate simultaneously with the main shaft 301 without time delay. When the motor switches forward and reverse rotation at a high frequency, due to the pre-tension of the first elastic component 6 and the second elastic component 7, the installation clearance between each axial part is controlled within an appropriate range, that is, although there is no free clearance in the axial direction of the main shaft 301, there is a pre-tightening clearance. There is only static friction but no sliding friction between the parts, so there is no audible friction and vibration sound, which reduces the commutation noise of the motor.

[0025] like Figure 4As shown, in a preferred embodiment, the first elastic component 6 includes an outer shell 601 that is tightly pressed against the rear moving block 302 and the magnetic steel pad 303, and a cavity 602 located in the inner cavity of the outer shell 601. When the outer shell 601 is assembled between the rear moving block 302 and the magnetic steel pad 303 with a smaller axial gap, the cavity 602 is squeezed and deformed to a greater extent, and the air pressure in the cavity 602 is relatively large, which ensures the elastic force and pre-pushing force while reducing the commutation noise of the motor; when the outer shell 601 is assembled between the rear moving block 302 and the magnetic steel pad 303 with a larger axial gap, the cavity 602 is squeezed and deformed to a lesser extent, and the air pressure in the cavity 602 also increases. Combined with the elastic force of the outer shell 601, the elastic force and pre-pushing force on the rear moving block 302 and the magnetic steel pad 303 can also be ensured, and the outer shell 601 will not generate additional noise due to vibration. Therefore, the cooperation between the outer shell 601 and the cavity 602 can make the first elastic component 6 adapt to axial clearances of various axial distances, without preparing gaskets of various thicknesses to match the axial clearances between parts, thereby reducing the commutation noise of the motor.

[0026] In a preferred embodiment, a plurality of elastic balls 603 are evenly arranged in the cavity 602. When the outer shell 601 is under pressure, the elastic balls 603 are deformed under pressure and generate reverse elastic force, cooperating with the outer shell 601 to provide pre-pushing force to the rear moving block 302 and the magnetic steel pad 303. The elastic balls 603 are made of rubber material with a fast rebound speed. The elastic balls 603 are solid spheres. The elastic balls 603 are evenly movably arranged or fixedly arranged along the annular axis of the cavity 602 to ensure that the force and elastic force are uniform.

[0027] like Figure 5 As shown, in a preferred embodiment, the second elastic component 7 includes a solid portion 701 that is sleeved and tightly abutted against the sleeve 304, and a plurality of elastic rings 702 that are tightly abutted against the front moving block 305. The elastic rings 702 are integrally formed with the solid portion 701, and an annular cavity 703 is defined between adjacent elastic rings 702. When the axial clearance between the sleeve 304 and the front moving block 305 is small, the elastic rings 702 deform significantly, and the annular cavity 703 can accommodate a certain amount of buffering. Together with the solid portion 701, a large elastic force is generated. This elastic force can generate sufficient pre-load force between the sleeve 304 and the front moving block 305, thereby reducing the commutation noise of the motor. When the axial clearance between the sleeve 304 and the front moving block 305 is large, the elastic rings 702 deform slightly and, together with the solid portion 701, generate a certain amount of elastic force. This elastic force can generate sufficient pre-load force between the sleeve 304 and the front moving block 305, preventing the second elastic component 7 from generating additional noise due to vibration. The annular cavity 703 is provided with a radial connector 704 connected to the adjacent elastic ring 702, which can further ensure the rapid rebound of the elastic ring 702.

[0028] The preferred specific implementation methods and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above implementation methods and embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A motor capable of reducing commutation noise, comprising a housing (1) provided with a rear end cover (101) and a front end cover (102), a Hall commutation component (4) connected to a cable (5) being provided in the housing (1), a stator component (2) and a rotor component (3) provided with a main shaft (301) being connected to the housing (1), a rear moving block (302) and a magnetic steel washer (303) being installed on a side of the main shaft (301) close to the rear end cover (101), and a shaft sleeve (304) and a front moving block (305) being installed on a side of the main shaft (301) close to the front end cover (102), wherein: A first elastic component (6) located on the outer periphery of the main shaft (301) is provided between the rear moving block (302) and the magnetic steel pad (303), and the first elastic component (6) includes an outer shell (601) pressed tightly against the rear moving block (302) and the magnetic steel pad (303) and a cavity (602) located in the inner cavity of the outer shell (601). A second elastic component (7) pressed tightly against the front moving block (305) is provided on one end of the shaft sleeve (304), and the second elastic component (7) includes a solid part (701) sleeved and pressed tightly against the shaft sleeve (304) and a plurality of elastic rings (702) pressed tightly against the front moving block (305).

2. The motor capable of reducing commutation noise according to claim 1, characterized in that: A plurality of elastic balls (603) are evenly arranged in the cavity (602).

3. The motor capable of reducing commutation noise according to claim 2, characterized in that: The elastic balls (603) are evenly movably arranged or fixedly arranged along the annular axis of the cavity (602).

4. The motor capable of reducing commutation noise according to claim 2, characterized in that: The elastic ball (603) is made of rubber material.

5. The motor capable of reducing commutation noise according to claim 1, characterized in that: The elastic ring (702) and the solid portion (701) are integrally formed, and an annular cavity (703) is provided between adjacent elastic rings (702).

6. The motor capable of reducing commutation noise according to claim 5, characterized in that: A radial connector (704) connected to the adjacent elastic ring (702) is provided in the annular cavity (703).

7. The motor capable of reducing commutation noise according to claim 1, characterized in that: The first elastic component (6) and the second elastic component (7) are made of polyurethane elastomer material.

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