Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Permanent magnet type rotary motor and compressor using same

A rotating motor and permanent magnet technology, applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve problems such as reducing pulsating torque, and achieve the effect of reducing torque and reducing noise

Inactive Publication Date: 2006-10-04
HITACHI IND EQUIP SYST CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce these problems, although it is possible to implement inclination on the rotor or stator core, even if only the cogging torque is reduced, there is a problem that the actual pulsating torque cannot be greatly reduced

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 type rotary motor and compressor using same
  • Permanent magnet type rotary motor and compressor using same
  • Permanent magnet type rotary motor and compressor using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The axial cross section of the stator 2 in the first embodiment is the same at any position, but the axial cross section of the rotor 3 differs depending on the position. Figure 4 A perspective view of a rotor according to Embodiment 1 of the present invention is shown. exist Figure 4 Among them, the inline permanent magnets 13 are accommodated in the permanent magnet insertion holes 12 which are continuous at the same position along the axial direction, and only the circumferential position of the magnetic pole portion 18 is different according to the axial direction. In other words, the positions of the pole cores of the rotor are shifted in a stepwise manner with respect to the axial direction.

[0051] However, in the permanent magnet type rotating electrical machine 1 for driving a compressor which is the object of the present invention, there is always a problem of noise generation. The ripple torque is a main factor that increases the noise of the permanent m...

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

Permanent magnet type rotary electric machine and compressor using same. In the permanent magnet type rotary electric machine, when the flux axis of a permanent magnet is set as a d-axis, and an axis orthogonal to the d-axis is set as a q-axis, permanent magnet insertion holes formed in a rotor iron core are arranged at the same position in the axial direction, a magnetic pole iron core is formed in which the gap length of the q-axis side is made longer than the gap length of the d-axis side for aggregating magnetic fluxes of the permanent magnets, a plurality of gap faces are formed at the external periphery of the magnetic pole iron core, and the position of the magnetic pole iron core is arranged so as to be shifted stepwise relative to the axial direction. The pulse torque at driving is thus reduced by half with phases of the pulse torque and the cogging torque generated by a winding shifted with each other at 180[deg.], thereby achieving low noise.

Description

technical field [0001] The present invention relates to a permanent magnet rotating electrical machine having a rotor with permanent magnets for forming a magnetic field, and more particularly to a permanent magnet rotating electrical machine mounted in compressors such as air conditioners, refrigerators, and freezers. Background technique [0002] Conventionally, various shapes have been employed in such permanent magnet rotating electric machines. For example, in the permanent magnet type rotating electrical machine described in Japanese Patent Laid-Open No. 2000-175389, by setting the shape of the outer peripheral surface after one side of the magnetic pole of the rotor core is cut and then inverting it in the axial direction to laminate, Instead, a simulated tilt is formed, reducing cogging torque associated with noise generation. In the permanent magnet rotating electrical machine described in Japanese Patent Laid-Open No. 2002-84693, by setting the effective magnetic ...

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 Patents(China)
IPC IPC(8): H02K1/27
Inventor 湧井真一小原木春雄菊地聪妹尾正治野间启二
Owner HITACHI IND EQUIP SYST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com