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Built-in magnetic steel hybrid excitation motor based on brushless AC excitation

A hybrid excitation motor, AC excitation technology, applied in synchronous motors with static armatures and rotating magnets, synchronous machine parts, magnetic circuit rotating parts, etc., can solve the problem of low space utilization, serious geometric constraints of the stator, Low power density, etc.

Active Publication Date: 2020-10-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of this excitation method is still too complicated, with low space utilization and low power density
In addition, the stator permanent magnet hybrid excitation motor sets the DC excitation winding on the stator, and the brushless excitation is simple and reliable; furthermore, the rotor of this type of motor is passive, which leads to serious geometric constraints on the stator, low utilization of motor materials and low excitation efficiency

Method used

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  • Built-in magnetic steel hybrid excitation motor based on brushless AC excitation
  • Built-in magnetic steel hybrid excitation motor based on brushless AC excitation
  • Built-in magnetic steel hybrid excitation motor based on brushless AC excitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]With three-phase inner rotor motor m=3, N s =24, p =2 as an example, where m represents the number of motor phases, N s Indicates the number of stator slots, and p indicates the number of pole pairs of the built-in magnetic steel rotor.

[0055] Such as figure 1 As shown, a hybrid excitation motor with built-in magnet steel based on brushless AC excitation includes a stator 1 and a built-in magnet steel rotor, and there is an air gap between the stator and the built-in magnet steel rotor.

[0056] The stator slots of the stator are respectively wound with an armature winding 11 and an AC field winding 12, both of which are AC windings, and the number of pole pairs of the armature winding is equal to the number of pole pairs of the AC field winding, and both are equal to the The pole pair number p of the magnetic steel rotor is 2.

[0057] The armature winding and the field winding are respectively wound on both sides of the stator slot in the stator. The relative ...

Embodiment 2

[0074] A magnetic barrier is set on the quadrature-axis magnetic circuit of the inner magnetic steel rotor in Embodiment 1 to reduce the influence of the armature reaction on the AC excitation magnetic field and the permanent magnetic field, and improve the output capacity of the motor.

[0075] The magnetic barriers in this embodiment 1 are surface cross-axis magnetic barriers 23, and the number of surface cross-axis magnetic barriers is 2p, which is 4 in this embodiment 2, and they are evenly arranged along the outer surface of the built-in magnetic steel rotor in the circumferential direction; as Figure 4 As shown, the purpose is to increase the air gap of the quadrature axis magnetic circuit. The cross-axis magnetic barrier is an air gap or a non-magnetically permeable material.

Embodiment 3

[0077] On the basis of Embodiment 2, 2p (that is, 4) strip-shaped built-in quadrature-axis magnetic barriers 24 are also arranged in the rotor core of the built-in magnetic steel rotor, and the strip-shaped built-in quadrature-axis magnetic barriers are arranged on each group of built-in magnetic steel on the axis of symmetry, such as Figure 5 shown. The bar-shaped built-in cross-axis magnetic barrier is an air gap or a non-magnetic material.

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Abstract

The invention discloses a built-in magnetic steel hybrid excitation motor based on brushless AC excitation. The built-in magnetic steel hybrid excitation motor comprises a stator and a built-in magnetic steel rotor. An armature winding and an AC excitation winding are wound in the stator slots of the stator. The armature winding and the AC excitation winding are both AC windings. The built-in magnetic steel rotor includes a rotor core and 2p groups of built-in magnetic steel uniformly distributed along the circumferential direction of the rotor core. Each group of built-in magnetic steel is one, two or a combination of straight-type, V-type, W-type, U-type and arc-type magnetic steel. When each group of built-in magnetic steel includes the straight-type magnetic steel, the long side of thestraight-type magnetic steel is arranged perpendicular to the radial direction. The built-in magnetic steel hybrid excitation motor uses the brushless AC excitation and the built-in magnetic steel rotor, can avoid the irreversible demagnetization caused by the electric excitation and contributes to magnetic field adjustment for the built-in magnetic steel in different shapes. In addition, a magnetic barrier is arranged on a rotor quadrature-axis magnetic circuit to reduce the influence of the armature reaction on the AC excitation magnetic field and the permanent magnetic field, and improve the output capability of the motor.

Description

technical field [0001] The invention relates to the field of motor design, in particular to a built-in magnetic steel hybrid excitation motor based on brushless AC excitation. Background technique [0002] Permanent magnet motors have the advantages of high torque density, high power density and high efficiency, and have been applied in many occasions. According to the position classification of permanent magnets, permanent magnet motors are divided into rotor permanent magnet motors and stator permanent magnet motors. Among them, the rotor permanent magnet motor can be divided into surface mount permanent magnet motor and built-in permanent magnet motor. Since the built-in permanent magnet motor is easy to obtain a large saliency ratio and reluctance torque component, it can obtain better constant power operation capability than the surface-mounted permanent magnet motor. However, permanent magnet motors are field weakened by applying a negative direct axis current compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/14H02K21/02H02K1/16H02K1/27H02K21/22H02K21/04
Inventor 李健王凯刘闯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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