Magnetic circuit structure for improving NVH (noise vibration and harshness) of motor

Abstract

The utility model relates to the technical field of motors, in particular to a magnetic circuit structure for improving NVH (noise vibration and harshness) of a motor, a stator core of the magnetic circuit structure is formed by splicing and assembling a plurality of groups of stator teeth and is annular, and the stator core achieves a notch-free effect while ensuring winding, so that magnetic resistance is kept unchanged when a rotor core rotates, electromagnetic noise is reduced, and the service life of the motor is prolonged. The NVH of the motor is reduced; comprising a rotor iron core and a stator iron core, the stator iron core is annular, the stator iron core is formed by splicing a plurality of groups of stator teeth, and the rotor iron core is arranged on the inner side of the stator iron core.

Description

A magnetic circuit structure for improving motor NVH Technical Field

[0001] This utility model relates to the technical field of motors, and in particular to a magnetic circuit structure for improving the NVH of motors. Background Technology

[0002] With increasingly stringent requirements for energy conservation and environmental protection, pumps, as a key power source, must also meet the standards of high efficiency and low energy consumption.

[0003] A water pump is a machine that transports or pressurizes liquids. It transfers the mechanical energy of a prime mover or other external energy to the liquid, increasing the liquid's energy. It is mainly used to transport liquids including water, oil, acid and alkali solutions, emulsions, suspensions, and liquid metals.

[0004] There are many factors affecting the NVH (Noise, Vibration, and Harshness) of brushless motors. Our focus is on the motor's electromagnetic noise, which mainly consists of two parts: noise caused by slot-pole interaction (due to the perfectly sinusoidal drive current); and motor noise caused by harmonics from the phase current injected by the PWM wave carrier drive.

[0005] The noise caused by slot-pole interaction is mainly due to cogging torque fluctuations, which are torque pulsations generated by the interaction between the permanent magnet and the stator slots. It is a parasitic torque that causes torque fluctuations, vibrations, and noise during motor operation, affecting the motor's performance and service life.

[0006] This structure is primarily used to improve cogging torque ripple. The stator core has slots; when the rotor permanent magnet rotates, the air gap permeability changes periodically, causing a periodic change in the tangential component of the magnetic force on the permanent magnet, thus generating cogging torque. For example, in a simple permanent magnet motor, the magnetic resistance is higher when the rotor's permanent magnet passes through the stator's teeth and lower when it passes through the slots; this change in magnetic resistance leads to the generation of cogging torque.

[0007] However, the winding of a brushless motor is done with a single tooth, so a certain gap needs to be maintained between each tooth to ensure that the winding nozzle can pass through or the wire can be inserted.

[0008] This invention proposes a structure that reduces the distance between stator teeth while ensuring winding, so that the stator core achieves a slotless effect. This allows the magnetic reluctance to remain constant when the rotor rotates, thereby reducing electromagnetic noise and lowering the motor's NVH (noise, vibration, and harshness). Summary of the Invention

[0009] To solve the above-mentioned technical problems, this utility model proposes a magnetic circuit structure to improve the NVH of a motor.

[0010] This utility model discloses a magnetic circuit structure for improving the NVH of a motor, comprising a rotor core and a stator core. The stator core is annular and is composed of multiple sets of stator teeth. The rotor core is located inside the stator core. The stator core, assembled from multiple sets of stator teeth in an annular shape, ensures that the stator core achieves a slotless effect while ensuring winding, thereby maintaining constant magnetic resistance when the rotor core rotates, thus reducing electromagnetic noise and lowering the NVH of the motor.

[0011] Preferably, the stator teeth are in the shape of an "I" and the outer end of the stator teeth is provided with a winding groove. One side of the stator teeth is provided with a boss and the other side of the stator teeth is provided with a groove, and the boss and the groove are adapted to each other. In use, the boss on one set of stator teeth is inserted into the groove on another set of stator teeth, and so on, so that multiple sets of stator teeth are assembled into a stator core. The stator core is annular, and the winding groove ensures winding while making the stator core achieve a slotless effect.

[0012] Preferably, the number of stator teeth is 9 sets; the 9 sets of stator teeth form a stator core with a 9-slot, 6-pole structure, so that the stator core achieves an effect close to slotless.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the stator core is assembled from multiple sets of stator teeth in a ring shape, which ensures that the stator core achieves a slotless effect while winding, so that the magnetic resistance remains unchanged when the rotor core rotates, thereby reducing electromagnetic noise and thus reducing the NVH of the motor. Attached Figure Description

[0014] Figure 1 is a structural schematic diagram of this utility model;

[0015] Figure 2 is a partial enlarged structural diagram of part A in Figure 1;

[0016] Figure 3 is a schematic diagram of the first axonometric structure of the stator teeth;

[0017] Figure 4 is a schematic diagram of the second axonometric structure of the stator teeth.

[0018] The following labels are used in the attached diagram: 1. Rotor core; 2. Stator core; 3. Rotor teeth; 4. Winding slot; 5. Boss; 6. Groove. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0020] Example

[0021] As shown in Figures 1 to 4, the present invention provides a magnetic circuit structure for improving the NVH of a motor, including a rotor core 1 and a stator core 2. The stator core 2 is annular and is composed of multiple sets of stator teeth 3 spliced ​​together. The rotor core 1 is located inside the stator core 2.

[0022] The stator tooth 3 is in the shape of an "I". The outer end of the stator tooth 3 is provided with a winding groove 4. A boss 5 is provided on one side of the stator tooth 3, and a groove 6 is provided on the other side of the stator tooth 3. The boss 5 and the groove 6 are compatible.

[0023] The number of stator teeth 3 is 9 sets.

[0024] In this embodiment, during use, the bosses 5 on one set of stator teeth 3 are inserted into the grooves 6 on another set of stator teeth 3, arranged in one go, so that multiple sets of stator teeth 3 are assembled into stator core 2. The stator core 2 is annular. The winding groove 4 ensures winding while achieving the effect of no slot in the stator core 2. The stator core 2 is assembled from multiple sets of stator teeth 3 in an annular shape, ensuring winding while achieving the effect of no slot in the stator core 2. Thus, when the rotor core 1 rotates, the magnetic resistance remains unchanged, thereby reducing electromagnetic noise and thus reducing the NVH of the motor.

[0025] The rotor core 1 of this utility model, which improves the magnetic circuit structure of a motor NVH, is commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A magnetic circuit structure for improving the NVH (noise, vibration, and harshness) of a motor, comprising a rotor core (1) and a stator core (2), wherein the stator core (2) is annular, characterized in that, The stator core (2) is spliced ​​together from multiple sets of stator teeth (3), and the rotor core (1) is inside the stator core (2).

2. The magnetic circuit structure for improving motor NVH as described in claim 1, characterized in that, The stator tooth (3) is in the shape of "I". The outer end of the stator tooth (3) is provided with a winding groove (4). A boss (5) is provided on one side of the stator tooth (3) and a groove (6) is provided on the other side of the stator tooth (3). The boss (5) and the groove (6) are compatible.

3. The magnetic circuit structure for improving motor NVH as described in claim 2, characterized in that, The number of stator teeth (3) is 9 sets.

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