Low-noise motor

Abstract

The utility model discloses a low noise motor, which comprises a rotating shaft, a rotor assembly, a stator assembly and a shell assembly, the shell assembly is internally provided with an accommodating cavity for placing the stator assembly and the rotor assembly, the stator assembly comprises a main stator iron core with a winding, and the stator assembly further comprises an auxiliary stator iron core. The auxiliary stator iron core is axially arranged on one side or two sides of the main stator iron core, a plurality of tooth grooves are formed in the auxiliary stator iron core, the axial height of the rotor assembly is larger than that of the main stator iron core, and the main stator iron core with the winding and the auxiliary stator iron core without the winding are respectively and magnetically coupled with the rotor assembly. The higher part of the rotor assembly can generate a cogging torque with the auxiliary stator to offset an electromagnetic torque output by the main motor to generate a plurality of harmonic torques, so that the torque fluctuation of the motor is reduced, and the effects of smooth torque output and reduction of motor vibration and noise are achieved.

Description

Technical Field

[0001] The utility model relates to a low-noise motor. Background Art

[0002] The noise problem has always been one of the key issues in the motor field, so reducing noise is one of the key directions of motor optimization solutions. Among them: ensuring low torque pulsation is one of the important indicators for measuring noise level. At present, there are many means to optimize torque. The mainstream optimization solutions mainly include motor skewed poles and skewed slots; opening auxiliary slots on the surface of stators and rotors; optimizing rotor pole arc coefficients, outer circular shapes, stator tooth pole shoe shapes, etc. These measures are mainly to obtain air gap magnetic density that is closer to sinusoidal and obtain lower torque pulsation amplitude; when the motor body can no longer be optimized, the harmonic injection of the controller is used to offset or reduce specific harmonic torque and obtain low torque pulsation.

[0003] The existing technical solutions have skewed poles and slots in the motor; auxiliary slots are opened on the surface of the stator and rotor; the rotor pole arc coefficient, outer circular shape, stator tooth pole shoe shape, etc. are optimized, or the harmonic injection method of the motor control is used to suppress it. There are still problems or defects: optimizing the stator and rotor of the motor body sacrifices the output capacity of the motor part, and the electromagnetic cost needs to be increased to maintain the original output capacity of the motor; secondly, this type of optimization solution is highly targeted, mainly optimizing known large-amplitude torque harmonics or known noise-causing harmonic torques, and cannot be changed after finalization. If different noises are generated again after the subsequent motor is equipped with different loads, the difficulty of optimization will increase again. After the optimization is completed, long-cycle operations such as mold modification are involved, which is not conducive to rapid response. Summary of the invention

[0004] The purpose of the utility model is to provide a low-noise motor to solve the technical problem that in the prior art, the optimization is performed for known large-amplitude torque harmonics or known noise-causing harmonic torques, and the motor cannot be changed after being finalized. If different noises are generated again after the subsequent motor is matched with different loads, the difficulty of optimization increases. After the optimization is completed, long-cycle operations such as mold modification are involved, which is not conducive to rapid response.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The utility model provides a low-noise motor, comprising a rotating shaft, a rotor assembly, a stator assembly and a shell assembly, wherein a housing cavity for placing the stator assembly and the rotor assembly is arranged in the shell assembly, the stator assembly is sleeved outside the rotor assembly, the stator assembly comprises a main stator core with a winding, and is characterized in that: the stator assembly also comprises an auxiliary stator core without a winding, the auxiliary stator core is axially arranged on one side or both sides of the main stator core, each auxiliary stator core is provided with a plurality of tooth slots, the axial height of the rotor assembly is higher than the axial height of the main stator core, the main stator core with the winding and the auxiliary stator core without the winding are magnetically coupled with the rotor assembly respectively.

[0007] The plurality of auxiliary stator cores mentioned above include a first auxiliary stator core and a second auxiliary stator core, and the first auxiliary stator core and the second auxiliary stator core are axially arranged on both sides of the main stator core, respectively.

[0008] The first auxiliary stator core described above is provided with 12 tooth slots, and the second auxiliary stator core is provided with 6 tooth slots.

[0009] The rotor assembly described above includes a rotor core and a plurality of permanent magnets installed on the outer side of the rotor core, the rotating shaft is installed on the rotor core, the axial height of the permanent magnets is higher than the axial height of the main stator core, and the raised portion of the permanent magnets is close to the tooth slots of the first auxiliary stator core.

[0010] The first auxiliary stator core and the second auxiliary stator core described above are set to have different thicknesses according to actual requirements of harmonic torque.

[0011] The housing assembly described above includes a housing and end covers respectively installed at both ends of the housing. An accommodating cavity is formed between the housing and the end covers at both ends, and one end of the rotating shaft extends out from one of the end covers.

[0012] The auxiliary stator core is arranged parallel to the main stator core.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The utility model includes a rotating shaft, a rotor assembly, a stator assembly and a shell assembly. The shell assembly is provided with a receiving cavity for placing the stator assembly and the rotor assembly. The stator assembly is sleeved outside the rotor assembly. The stator assembly includes a main stator core with a winding, and is characterized in that: the stator assembly also includes an auxiliary stator core without a winding, the auxiliary stator core is axially arranged on one side or both sides of the main stator core, a plurality of tooth slots are provided on the auxiliary stator core, the axial height of the rotor assembly is higher than the axial height of the main stator core, and the protruding portion of the rotor assembly can generate a tooth slot torque with the auxiliary stator, which is used to offset the electromagnetic torque output by the main motor to generate a plurality of harmonic torques, thereby reducing the torque fluctuation of the motor, achieving a smooth torque output, and reducing the vibration and noise of the motor. After being finalized, it can also be quickly changed, and only the auxiliary stator core needs to be changed, which is simple, convenient and fast.

[0015] 2. Other advantages of the utility model are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram provided for the utility model;

[0017] Figure 2 An exploded view provided for the utility model;

[0018] Figure 3 A schematic diagram of a local structure provided by the utility model;

[0019] Figure 4 A front view provided for the utility model;

[0020] Figure 5 for Figure 4 Sectional view of AA. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1:

[0023] like Figures 1 to 5 As shown, this embodiment provides a low-noise motor, including a rotating shaft 1, a rotor assembly 2, a stator assembly 3 and a housing assembly 4, wherein a housing chamber 40 for placing the stator assembly 3 and the rotor assembly 2 is provided in the housing assembly 4, the stator assembly 3 is sleeved outside the rotor assembly 2, and the stator assembly includes a main stator core 32 with a winding 31, characterized in that: the stator assembly 3 also includes an auxiliary stator core 33 without a winding, the auxiliary stator core 33 is axially arranged on one side or both sides of the main stator core 32, and each auxiliary stator core 33 is provided with a plurality of tooth slots 330, the axial height of the rotor assembly 2 is higher than the axial height of the main stator core 32, and the main stator core 32 with the winding 31 and the auxiliary stator core 33 without the winding are magnetically coupled with the rotor assembly 2 respectively. The protruding part of the rotor assembly can generate tooth slot torque with the auxiliary stator, which is used to offset the electromagnetic torque output by the main motor to generate a plurality of harmonic torques, thereby reducing the torque fluctuation of the motor, achieving the effect of smooth torque output, reducing motor vibration and noise. After finalization, it can be quickly modified by simply changing the auxiliary stator core, which is simple, convenient and fast.

[0024] The auxiliary stator core 33 includes a first auxiliary stator core 331 and a second auxiliary stator core 332 . The first auxiliary stator core 331 and the second auxiliary stator core 332 are axially arranged on both sides of the main stator core 32 .

[0025] The first auxiliary stator core 331 is provided with 12 tooth slots 330, and the second auxiliary stator core 332 is provided with 6 tooth slots 330. For different frequency harmonic torques, the number of tooth slots on the auxiliary stator core can be adjusted to correspond to different frequency torque requirements, thereby achieving the optimal effect and the structural arrangement is reasonable.

[0026] The above-mentioned rotor assembly 2 includes a rotor core 21 and a plurality of permanent magnets 22 installed on the outer side of the rotor core 21. The rotating shaft 1 is installed on the rotor core 21. The axial height of the permanent magnet 22 is higher than the axial height of the main stator core 32. The raised portion of the permanent magnet 22 is close to the tooth slot 330 of the first auxiliary stator core 331. The raised portion of the rotor assembly can generate a tooth slot torque with the auxiliary stator to offset the electromagnetic torque output by the main motor to generate a plurality of harmonic torques, thereby reducing the torque fluctuation of the motor, achieving a smooth torque output, and reducing motor vibration and noise.

[0027] The above-mentioned first auxiliary stator core 331 and second auxiliary stator core 332 are set to different thicknesses according to the actual needs of harmonic torque. For different harmonic torque amplitudes, the thickness of the auxiliary stator can be adjusted to correspond to the requirements of different harmonic torque amplitudes, thereby achieving the optimal effect and reasonable structural layout.

[0028] The housing assembly 4 comprises a housing 41 and end covers 42 respectively mounted at both ends of the housing 41. An accommodating cavity 40 is formed between the housing 41 and the end covers 42 at both ends. One end of the rotating shaft 1 extends out from one of the end covers 42. The structural arrangement is reasonable.

[0029] The auxiliary stator core 33 is arranged parallel to the main stator core 32, and the structural arrangement is reasonable.

[0030] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A low-noise motor, comprising a rotating shaft (1), a rotor assembly (2), a stator assembly (3) and a housing assembly (4), wherein the housing assembly (4) is provided with a receiving cavity (40) for accommodating the stator assembly (3) and the rotor assembly (2), the stator assembly (3) is sleeved outside the rotor assembly (2), and the stator assembly comprises a main stator core (32) with a winding (31), characterized in that: The stator assembly (3) further comprises an auxiliary stator core (33) without a winding, the auxiliary stator core (33) being axially arranged on one side or both sides of the main stator core (32), a plurality of tooth slots (330) being provided on the auxiliary stator core (33), the axial height of the rotor assembly (2) being higher than the axial height of the main stator core (32), and the main stator core (32) with the winding (31) and the auxiliary stator core (33) without the winding being magnetically coupled to the rotor assembly (2) respectively.

2. A low noise motor according to claim 1, characterized in that: The plurality of auxiliary stator cores (33) include a first auxiliary stator core (331) and a second auxiliary stator core (332), and the first auxiliary stator core (331) and the second auxiliary stator core (332) are respectively axially arranged on both sides of the main stator core (32).

3. A low noise motor according to claim 2, characterized in that: The first auxiliary stator iron core (331) is provided with 12 tooth slots (330), and the second auxiliary stator iron core (332) is provided with 6 tooth slots (330).

4. A low noise motor according to claim 1, 2 or 3, characterized in that: The rotor assembly (2) comprises a rotor core (21) and a plurality of permanent magnets (22) mounted on the outer side of the rotor core (21); the rotating shaft (1) is mounted on the rotor core (21); the axial height of the permanent magnets (22) is higher than the axial height of the main stator core (32); and the raised portion of the permanent magnets (22) is close to the tooth slots (330) of the first auxiliary stator core (331).

5. A low noise motor according to claim 4, characterized in that: The first auxiliary stator core (331) and the second auxiliary stator core (332) are set to have different thicknesses according to actual requirements of harmonic torque.

6. A low noise motor according to claim 5, characterized in that: The housing assembly (4) comprises a housing (41) and end covers (42) respectively mounted at both ends of the housing (41); a receiving cavity (40) is formed between the housing (41) and the end covers (42) at both ends; one end of the rotating shaft (1) extends out from one of the end covers (42).

7. A low noise motor according to claim 4, characterized in that: The auxiliary stator core (33) is arranged parallel to the main stator core (32).

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