Embedded permanent magnet electric motor

A permanent magnet and motor technology, applied in synchronous motors with stationary armatures and rotating magnets, electric components, magnetic circuit rotating parts, etc., can solve the problem of large coil inductance, inability to obtain high output, and difficulty in winding stator coils. Winding and other problems, to achieve the effect of preventing magnetic flux drop, preventing thermal demagnetization, and easy winding

Inactive Publication Date: 2012-10-24
MITSUBISHI ELECTRIC CORP
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the conventional permanent magnet synchronous motor, there is a problem that the winding of the stator coil becomes difficult because the slot of the stator core is formed as a semi-closed slot having the eaves extending from the front ends of the teeth in the circumferential direction, and The inductance of the coil increases, and high output cannot be obtained during high-speed rotation

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
  • Embedded permanent magnet electric motor
  • Embedded permanent magnet electric motor
  • Embedded permanent magnet electric motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] figure 1 It is a cross-sectional view schematically showing the main structure of the permanent magnet embedded type motor according to Embodiment 1 of the present invention, figure 2 It is a figure which shows the result of analyzing the eddy current loss of the permanent magnet in the permanent magnet embedded type motor which concerns on Embodiment 1 of this invention, image 3 It is a cross-sectional view schematically showing the main structure of the permanent magnet embedded motor of Comparative Example 1, Figure 4 It is a cross-sectional view schematically showing the main structure of the permanent magnet embedded type motor of Comparative Example 2, Figure 5 It is a cross-sectional view schematically showing the main structure of a permanent magnet embedded motor of Comparative Example 3, Figure 6 It is a figure explaining the reduction mechanism of the eddy current loss in the permanent magnet embedded type motor, Figure 7 It is a diagram explaining t...

Embodiment approach 2

[0054] Figure 8 It is an end view schematically showing a stator core applied to a permanent magnet embedded motor according to Embodiment 2 of the present invention.

[0055] exist Figure 8 Among them, the stator core 3B is made, for example, by laminating a plurality of electromagnetic steel sheets punched into the same shape into one body, and includes an annular core rear end 3a and six teeth 11, and the six teeth 11 are respectively formed with a circumferential width The tapered shape gradually narrows toward the inner diameter side, extends radially inward from the inner peripheral surface of the core rear end 3a, and is arranged at equal angular intervals in the circumferential direction.

[0056] In addition, other structures are formed in the same manner as in Embodiment 1 described above.

[0057] According to Embodiment 2, since each tooth 11 is formed in a tapered shape in which the circumferential width becomes gradually narrower toward the inner diameter sid...

Embodiment approach 3

[0059] Figure 9 It is an end view schematically showing a stator core applied to a permanent magnet embedded motor according to Embodiment 3 of the present invention.

[0060] exist Figure 9 Among them, the core sheet 12 is made by laminating a plurality of electromagnetic steel sheets punched into the same shape, for example, and includes the core rear end portion 13, and Extended teeth 3b. The stator core 3C is configured by arranging six core pieces 12 in a ring shape in the circumferential direction and pressing them into a ring-shaped frame (not shown). Furthermore, the core rear end portions 13 are connected in the circumferential direction to constitute the core rear end 3a.

[0061] In addition, other structures are formed in the same manner as in Embodiment 1 described above.

[0062] According to the third embodiment, since the stator core 3C is divided into six core pieces 12 , the concentrated winding coils 4 a can be wound around the teeth 3 b of the core pi...

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 present invention aims to solve the above problems and an object of the present invention is to provide an embedded permanent magnet electric motor that facilitates mounting of a stator coil, that enables stator coil inductance to be reduced, and that also enables eddy currents that arise in permanent magnets to be reduced. The embedded permanent magnet electric motor (1) includes: a rotor (5) having: a rotor core (6) that has an outer circumferential surface that is constituted by a plurality of convex surfaces that are circular arc-shaped curved surfaces (7) that are arranged continuously at a uniform angular pitch circumferentially; and a plurality of permanent magnets (9) that are embedded in the rotor core (7) so as to be positioned on a radially inner side of each of the circular arc-shaped curved surfaces (7); and a stator (2) having: a stator core in which teeth (3b) are respectively disposed so as to extend radially inward from an annular core back (3a) and are arranged at a uniform angular pitch circumferentially to configure open slots; and a stator coil (4) that is constituted by a plurality of concentrated winding coils (4a) that are wound into concentrated windings on each of the teeth (3b).

Description

technical field [0001] The present invention relates to, for example, an embedded permanent magnet motor suitable for a vehicle motor. Background technique [0002] A conventional permanent magnet synchronous motor is equipped with a stator including a stator core formed by arranging a plurality of split cores in an annular shape, and a concentrated coil wound around the teeth of each split core in a concentrated winding manner. A stator coil wound with a coil; and a rotor configured by fixedly joining a plurality of permanent magnets to the outer peripheral surface of a cylindrical rotor core (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 11-89197 Contents of the invention [0004] In the conventional permanent magnet synchronous motor, there is a problem that the winding of the stator coil becomes difficult because the slot of the stator core is formed as a semi-closed slot having the eaves extending from the front e...

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): H02K21/14H02K1/27H02K1/12
CPCH02K1/148H02K2201/03H02K21/16H02K1/276
Inventor 西村慎二黑田洋一井上正哉枦山盛幸
Owner MITSUBISHI ELECTRIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap