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Brushless motor

A brushless motor and stator technology, applied in electric components, electrical components, electromechanical devices, etc., can solve the problems of reducing the power density of the brushless motor, the motor power density cannot be satisfied, and increasing the cogging torque of the motor, and achieves the highest improvement. Speed ​​margin, simple structure, and the effect of improving power density

Pending Publication Date: 2020-06-05
隆中电机技术(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the design of brushless motors, the biggest difficulty is that the power density of the motor cannot meet the requirements of EPS (Electric Power Steering System) and the cogging torque of the motor is large
There are many and complicated factors that affect the power density and cogging torque of brushless motors. Once a certain electromagnetic parameter is improperly selected, it may reduce the power density of brushless motors and increase the cogging torque of the motor, making it less suitable for On the power steering system and electric braking system of modern traditional cars, new energy vehicles and intelligent unmanned vehicles

Method used

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Examples

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Effect test

Embodiment 1

[0027] Example 1: Combining Figure 1~Figure 4 Shown is a specific embodiment of a brushless motor of the present invention, which is composed of a stator, a rotor set at the center of the stator, and a rotating shaft (omitted in the figure) that fixes the rotor. The stator has an annular stator core 1 formed by splicing 12 stator blocks 1a. Like the conventional technology, the left and right sides of the stator block 1a are provided with keys and grooves for splicing. Stator teeth 1b for winding coils 6 are formed radially inwardly on each stator block 1a, specifically as figure 2 As shown, an improvement of the present invention is that the inner surface of each stator tooth 1b is designed as an eccentric arc surface 5, and the eccentricity of the center of the eccentric arc of the eccentric arc surface 5 relative to the center of the annular stator core 1 is L, the centers of all eccentric arcs are located on the circle O1 with the center of the annular stator core 1 as ...

Embodiment 2

[0036] Embodiment 2: We also provide another embodiment of this case. The rotor in this embodiment is composed of two sections of rotor core 2 and corresponding rotor poles 3 arranged axially along the rotating shaft, and the two sections of rotor core 2 are in phase with each other. Wrong setting, the phase difference angle is 3°, specifically as Figure 5 shown. Others of this embodiment are completely the same as embodiment 1, can refer to its expression and Figure 1~Figure 4 .

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Abstract

The invention discloses a brushless motor. Stator tooth inner surfaces used for winding coils on the inner side of an annular stator core and a rotor core structure are optimized; the inner surface ofeach stator tooth is designed to be an eccentric arc surface; the eccentric distance between the center of the eccentric arc and the center of the annular stator core is L; the centers of all the eccentric arcs are located on a circle with the center of the annular stator core as the circle center L as the radius; the magnetic poles of the rotor are designed to be plug-in; each section of rotor core is provided with an insertion hole into which a rotor magnetic pole is inserted; meanwhile, radially outward convex parts corresponding to the jacks are formed on the outer circumference of the rotor core; the outer contour shapes of the convex parts are the same and symmetrical; each convex part comprises a top arc section and straight line sections symmetrically connected with the two sidesof the top arc section; and the straight line sections of the adjacent convex parts on the circumference are connected through a bottom arc section. According to the invention, the air-gap magnetic field waveform of the motor is in sinusoidal distribution; the cogging torque of the motor is further reduced; the rotational inertia of the rotor is reduced; and the power density and the working performance of the motor are improved.

Description

technical field [0001] The invention relates to a brushless motor and belongs to the technical field of motors. Background technique [0002] With the continuous improvement of the performance of permanent magnet materials, brushless motors are more and more widely used in the automotive industry. The automotive industry has special requirements for brushless motors. 1) The installation position is very limited, and the motor should be light in weight. It also requires the motor to have a certain output power, that is, the power density of the motor should be large; 2) Low cogging torque without Brush the motor to improve comfort and stability; 3) The cost of the motor should be low; 4) The moment of inertia should be small. [0003] In the design of brushless motors, the biggest difficulty is that the power density of the motor cannot meet the requirements of EPS (Electric Power Steering System) and the cogging torque of the motor is large. There are many and complex fact...

Claims

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Application Information

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IPC IPC(8): H02K1/14H02K1/27H02K29/00
CPCH02K1/146H02K1/276H02K29/00H02K2201/03H02K2213/03
Inventor 陈云华
Owner 隆中电机技术(昆山)有限公司