Unlock instant, AI-driven research and patent intelligence for your innovation.

Permanent-magnet motor rotor containing asymmetric magnetic poles

A permanent magnet motor, asymmetrical technology, applied in the direction of magnetic circuit rotating parts, magnetic circuits, electrical components, etc., can solve the problems of increasing motor torque ripple and reducing motor torque output capacity

Inactive Publication Date: 2017-09-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. It will cause axial magnetic flux leakage in the air gap, reducing the torque output capability of the motor
[0008] 2. When the alternating pole permanent magnet motor has q=0.5 (q is the number of slots per pole and phase), its back EMF contains a large number of even harmonics, which will increase the torque ripple of the motor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Permanent-magnet motor rotor containing asymmetric magnetic poles
  • Permanent-magnet motor rotor containing asymmetric magnetic poles
  • Permanent-magnet motor rotor containing asymmetric magnetic poles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 The permanent magnet motor rotor is an inner rotor

[0035] Such as figure 1 As shown, a permanent magnet motor rotor with asymmetric magnetic poles includes a rotor core 1 , a permanent magnet 2 and a rotating shaft 3 .

[0036] The rotor iron core is made of magnetically conductive material, and the rotor iron core is coaxially and fixedly sleeved on the outer periphery of the rotating shaft.

[0037] 2i core salient poles 12 are evenly distributed along the circumferential outer surface of the rotor core, where i=p / 3, p is the number of pole pairs of the motor, and p is a multiple of 3.

[0038] The outer circumferential surface of the rotor core between two adjacent core salient poles is provided with two permanent magnet slots, that is, the outer circumferential surface of the rotor core is provided with 4i permanent magnet slots 11 .

[0039] A permanent magnet 2 is nested in each permanent magnet slot.

[0040] The present invention takes a 6-pole...

Embodiment 2

[0057] Embodiment 2 The rotor of the permanent magnet motor is an outer rotor

[0058] Such as figure 2 As shown, a permanent magnet motor rotor with asymmetrical poles also includes a rotor core 1 and a permanent magnet 2 .

[0059] The structure and design principle of the rotor core 1 and the permanent magnet 2 are basically the same as those in Embodiment 1, the differences are as follows:

[0060] When the permanent magnet motor rotor is an outer rotor, the rotating shaft is replaced by a fixed shaft.

[0061] The stator is coaxially fixedly sleeved on the outer periphery of the fixed shaft, and the two form an integrated structure. The two ends of the fixed shaft protrude from the two ends of the stator respectively, and the two protruding ends of the fixed shaft are fitted with a bearing respectively.

[0062] The rotor iron core is coaxially sleeved on the outer periphery of the stator, and the rotor iron core is coaxially installed on the bearing through the suppo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a permanent-magnet motor rotor containing asymmetric magnetic poles. The permanent-magnet motor rotor comprises a rotor core and permanent magnets, wherein the rotor core is made of a magnetic conduction material, 2i iron core salient poles are uniformly arranged on an outer surface or an inner surface of the circumference of the rotor core along a circumferential direction, i=p / 3, p is motor pole pair number and is a multiple of 3, two permanent-magnet grooves are formed in the outer surface or the inner surface of the circumference of the rotor core between two adjacent iron core salient poles, each of the permanent magnets is embedded into each permanent-magnet groove, a central angle of each permanent magnet is smaller than or equal to a central angle of the corresponding permanent-magnet groove, the magnetization directions of two permanent magnets arranged between two adjacent iron core salient poles are opposite, and the magnetization directions of two permanent magnets arranged at two sides of the same iron core salient pole are same. By the permanent-magnet motor rotor, the motor cost can be reduced, the torque output capability can be ensured, meanwhile, leaked magnetism and the magnetization of an end part of a rotation shaft are reduced, and the torque pulse is reduced.

Description

technical field [0001] The invention relates to the field of motor design, in particular to a permanent magnet motor rotor with asymmetric magnetic poles. Background technique [0002] In recent years, due to its high torque density and high efficiency, permanent magnet motors have been widely used in home appliances, electric vehicles, wind power generation, aerospace and other occasions. Rare earth permanent magnet materials with high energy density are favored in the design and commercialization of permanent magnet motors. [0003] Traditional permanent magnet motors use a large amount of expensive rare earth permanent magnet materials, which is the main reason for their high production costs. In order to solve this problem, the invention patent 200710010915.0 provides an alternating pole permanent magnet motor. The number of permanent magnets is only half of that of the traditional permanent magnet motor, which reduces the total cost of the motor. [0004] However, the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27H02K1/24
CPCH02K1/24H02K1/27H02K1/2766H02K1/2786H02K2201/06H02K2213/03
Inventor 王凯李健吴科明刘闯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS