Permanent magnet motor rotor capable of automatic weaking magnet following rotation speed

A permanent magnet motor and automatic technology, applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve the problems of system efficiency drop, low torque, and rotor flux leakage, etc., to improve utilization efficiency, The effect of increasing torque and reducing flux leakage

Inactive Publication Date: 2008-05-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rotor with this structure has more magnetic flux leakage, and the torque is low at low speed; while at high speed, it needs to perform field weakening control, so the system efficiency decreases in the high speed area

Method used

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  • Permanent magnet motor rotor capable of automatic weaking magnet following rotation speed
  • Permanent magnet motor rotor capable of automatic weaking magnet following rotation speed
  • Permanent magnet motor rotor capable of automatic weaking magnet following rotation speed

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0006] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. It consists of a rotor core 1, a number of main pole permanent magnets 3, and a number of auxiliary permanent magnets 4. The rotor core 1 is cylindrical, and a number of radial slide grooves 9 are evenly distributed in the rotor core 1. Each of the A main pole permanent magnet 3 is inlaid in the radial chute 9 and the length of the main pole permanent magnet 3 is shorter than the radial chute 9, and on the top wall of the radial chute 9, it is connected with the The permanent magnets 3 are fixed with auxiliary permanent magnets 4 at intervals, the main pole permanent magnets 3 and the auxiliary permanent magnets 4 are both tangentially magnetized and the main pole permanent magnets 3 in the same radial slide groove 9 The magnetization direction of the auxiliary permanent magnet 4 is the same, the polarities of the adjacent side surfaces of the two adjac...

specific Embodiment approach 2

[0007] Specific implementation mode two: the following combination figure 1 This embodiment will be specifically described. A magnetic isolation slot 2 is respectively opened on both sides of the radial chute 9, and the two magnetic isolation slots 2 take the radial chute 9 as the center of symmetry, and the magnetic isolation slot 2 is opened in the radial direction. at the outer end of the chute 9. Other components and connections are the same as those in Embodiment 1. In this embodiment, "the reluctance of the rotor core 1 at the inner end of the radial chute 9 is smaller than the reluctance of the rotor core 1 at the outer end of the radial chute 9" is realized by separating the magnetic slot 2, the structure is simple, and the process is easy to realize . The function of the magnetic isolation groove 2 is to reduce the magnetic flux sent by the main pole permanent magnet 3 when the main pole permanent magnet 3 moves outwards into its position, so its size and shape ar...

specific Embodiment approach 3

[0008] Specific implementation mode three: the following combination figure 2 This embodiment will be specifically described. The difference between this embodiment and the second embodiment is that the rotor core 1 also includes a non-magnetically conductive plate 8, and the non-magnetically conductive plate 8 is arranged on both sides of the radial chute 9 and is located in the radial chute 9. at the outer end. In this embodiment, "the reluctance of the rotor core 1 at the inner end of the radial chute 9 is smaller than the reluctance of the rotor core 1 at the outer end of the radial chute 9" is realized by setting the non-magnetic conductive plate 8, and the two non-magnetic conductive plates 8 is also equivalent to the auxiliary slideway of the main pole permanent magnet 3, so that the main pole permanent magnet 3 can slide smoothly in the radial slide groove 9. Other compositions and connections are the same as those in Embodiment 2.

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PUM

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Abstract

Present invention relates to a automatically magnetic weakening permanent-magnet machine rotor for raising motor slow speed torque and high-speed efficiency, and widening motor speed adjustable range. It contains rotor core, number of main pole permanent magnets, number of auxiliary permanent magnet, radial sliding chute, and auxiliary permanent magnet. Said invention can be used in permanent magnet motor and permanent magnet generator.

Description

technical field [0001] The invention relates to a permanent magnet motor rotor capable of automatically weakening the magnetic field. Background technique [0002] The traditional tangentially magnetized permanent magnet synchronous motor rotor is to embed the main pole permanent magnet directly into the rotor core slot, and its structure is as follows: Figure 5 As shown, the air-gap flux density of the motor with this rotor structure is high, the power density of the motor is large, and it is easy to realize field-weakening control, and is suitable for fields requiring a large operating range of constant power. However, the rotor with this structure has more flux leakage, and the torque is low at low speed; while at high speed, field weakening control is required, so the system efficiency decreases in the high speed region. Contents of the invention [0003] The purpose of the present invention is to provide a permanent magnet motor rotor that can automatically weaken th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K1/28
Inventor 寇宝泉李春艳李立毅谢大纲程树康
Owner HARBIN INST OF TECH
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