Permanent-magnet type rotating electrical machine

Patent metadata

Field	Value
Publication number	US-9537380-B2
Application number	US-201214005429-A
Country	US
Kind code	B2
Filing date	Jan 18, 2012
Priority date	Mar 15, 2011
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A permanent-magnet type rotating electrical machine, including a rotor including a plurality of magnetic poles arranged at an equal interval, and a stator including a plurality of teeth and a plurality of armature windings. A high frequency voltage different in frequency and amplitude from voltages for generating a torque is applied to the armature windings. A magnetic pole position of the rotor is estimated by using a current trajectory of a measured high frequency current. When dq transform is applied to the measured high frequency current, a current trajectory forms an ellipse on d and q axes. Angular variation ranges of a major axis of the ellipse with respect to a load current and a rotor position are set so as to acquire a predetermined position estimation resolution.

First claim

The invention claimed is:

1. A permanent-magnet type rotating electrical machine, comprising:
a rotor including a plurality of magnetic poles arranged at an equal interval; and
a stator including a plurality of teeth and a plurality of armature windings, wherein:
the rotor includes permanent magnets inserted into P holes provided inside an outer peripheral surface of a rotor iron core in a peripheral direction at an equal interval;
the stator includes a stator iron core having N teeth and having a cylindrical shape on which the plurality of armature windings for generating a rotating magnetic field to rotate the rotor are provided, the stator iron core being divided into N stator blocks in the peripheral direction; and
a setting is made so that 0.6<La/(πD/N−Lb)<1.0 is satisfied, where La is a gap in the peripheral direction between distal end portions of the stator iron core neighboring each other in the peripheral direction, Lb is a size of each of the plurality of teeth in the peripheral direction, and D is an inner diameter dimension of the stator iron core, and P and N are set so that P/(greatest common divisor of P and N) is an odd number; and
the size Lb of the each of the plurality of teeth of the stator in the peripheral direction is set so that 0.57≧Lb/(πD/N) is satisfied;
wherein positioning control is carried out without using a rotation detection device, and
wherein the position of the rotor is detected in a state that the stator iron core is stably magnetically saturated and positioning control is carried out without using a rotation detection device.

2. A permanent-magnet type rotating electrical machine according to claim 1 , wherein R 0 and R 1 are set so that R 0 >R 1 is satisfied, where R 0 is an outer radius of the rotor, and R 1 is a radius of curvature of a surface of the rotor.

3. A permanent-magnet type rotating electrical machine according to claim 1 ,
wherein the ratio of the minor axis to the major axis of the ellipse in the current trajectory on d and q axes caused by an applied high frequency voltage when the positioning control is executed is set to be equal to or more than 6%.

Assignees

• Yamaguchi Shinichi
• Totoki Eigo
• Ito Masato
• Nishijima Daisuke
• Tanaka Toshinori
• Mitsubishi Electric Corp

Inventors

• Yamaguchi Shinichi
• Totoki Eigo
• Ito Masato
• Nishijima Daisuke
• Tanaka Toshinori

Classifications

• H02K29/03

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• H02P6/183

  using an injected high frequency signal · CPC title

• H02K29/12 Primary

  using detecting coils {using the machine windings as detecting coil} · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title