Rotating electrical machine

Patent metadata

Field	Value
Publication number	US-2020162003-A1
Application number	US-202016748535-A
Country	US
Kind code	A1
Filing date	Jan 21, 2020
Priority date	Jul 13, 2017
Publication date	May 21, 2020
Grant date	—

Abstract

A rotating electrical machine includes a magnetic field-producing unit, an armature with a multi-phase armature winding, and a rotor. The magnetic field-producing unit includes a first portion and a second portion. The first portion is located closer to a d-axis in a d-q axis coordinate system than the second position is. The second position is located closer to a q-axis in the d-q axis coordinate system than the first position is. The magnetic field-producing unit is magnetically oriented to meet a condition where an angle which an easy axis of magnetization of the first portion makes with the d-axis is smaller than an angle which an easy axis of magnetization of the second portion makes with the q-axis. The magnetic field-producing unit is configured to have an intrinsic coercive force of 400 kA/m and also have a remanent flux density of 1.0 T or more.

First claim

What is claimed is:

1 . A rotating electrical machine comprising:
a magnetic field-producing unit which includes a cylindrical magnet unit, the magnet unit having a plurality of magnetic poles having North and South polarities which are alternately arranged in a circumferential direction of the magnet unit; an armature which is equipped with a multi-phase armature winding; and a rotor which is provided by one of the magnetic field-producing unit and the armature, wherein the magnet unit includes a first portion and a second portion, the first portion being located closer to a d-axis in a d-q axis coordinate system than the second position is, the second position being located closer to a q-axis in the d-q axis coordinate system than the first position is, wherein the magnet unit is magnetically oriented to meet a condition where an angle which an easy axis of magnetization of the first portion of the magnet unit makes with the d-axis is smaller than an angle which an easy axis of magnetization of the second portion of the magnet unit makes with the q-axis, wherein the magnetic field-producing unit is configured to have an intrinsic coercive force of 400 kA/m and also have a remanent flux density of 1.0 T or more, wherein the armature winding includes a plurality of conductive members which face the magnetic field-producing unit and are arrayed at a given interval away from each other in a circumferential direction of the armature, wherein the armature winding is shaped to have a first dimension and a second dimension, the first dimension being a distance between an outer surface and an inner surface opposed to the outer surface in a radial direction of the armature, the second dimension being a dimension of a portion of the armature winding working as one of phases thereof in the circumferential direction of the armature, the first dimension being smaller than the second dimension, wherein conductor-to-conductor members are provided each of which is disposed between a respective adjacent two of the conductive members of the armature winding, and wherein if a portion of the armature which magnetically functions along with one of the poles of the magnet unit has a length in the circumferential direction of the armature, the sum of widths of the conductor-to-conductor members lying in a range of this length is defined as Wt, a saturation magnetic flux density of the conductor-to-conductor members is defined as Bs, a dimension of a portion of the magnet unit equivalent to one of the magnetic poles in the circumferential direction of the magnet unit is defined as Wm, and a remanent flux density in the magnet unit is defined as Br, the conductor-to-conductor members are made of material meeting a relation of Wt×Bs≤Wm×Br, or wherein the conductive members are arranged at given intervals away from each other in the circumferential direction of the armature, a non-magnetic member is disposed between a respective two of the conductive members arranged adjacent each other, each of the non-magnetic members fully occupies the given interval between the conductive members, wherein each of the conductive members is made of a bundle of a plurality of wires, wherein the wires of each of the conductive members are arranged adjacent to and in contact with each other, and wherein a respective adjacent two of the wires has a first electrical resistivity in a direction in which the wires are arranged adjacent each other, each of the wires having a second electrical resistivity in a length-wise direction thereof, the first electrical resistivity being higher than the second electrical resistivity.

2 . A rotating electrical machine comprising:
a magnetic field-producing unit which includes a cylindrical magnet unit, the magnet unit having a plurality of magnetic poles having North and South polarities which are alternately arranged in a circumferential direction of the magnet unit; an armature which is equipped with a multi-phase armature winding; and a rotor which is provided by one of the magnetic field-producing unit and the armature, wherein the magnet unit includes a first portion and a second portion, the first portion being located closer to a d-axis in a d-q axis coordinate system than the second position is, the second position being located closer to a q-axis in the d-q axis coordinate system than the first position is, wherein the magnet unit is magnetically oriented to meet a condition where an angle which an easy axis of magnetization of the first portion of the magnet unit makes with the d-axis is smaller than an angle which an easy axis of magnetization of the second portion of the magnet unit makes with the q-axis, wherein the magnetic field-producing unit is configured to have an intrinsic coercive force of 400 kA/m and also have a remanent flux density of 1.0 T or more, wherein the armature winding includes a plurality of conductive members which face the magnetic field-producing unit and are arrayed at a given interval away from each other in a circumferential direction of the armature, wherein the armature winding is shaped to have a first dimension and a second dimension, the first dimension being a distance between an outer surface and an inner surface opposed to the outer surface in a radial direction of the armature, the second dimension being a dimension of a portion of the armature winding working as one of phases thereof in the circumferential direction of the armature, the first dimension being smaller than the second dimension, wherein conductor-to-conductor members are provided each of which is disposed between a respective adjacent two of the conductive members of the armature winding, and wherein if a portion of the armature which magnetically functions along with one of the poles of the magnet unit has a length in the circumferential direction of the armature, the sum of widths of the conductor-to-conductor members lying in a range of this length is defined as Wt, a saturation magnetic flux density of the conductor-to-conductor members is defined as Bs, a dimension of a portion of the magnet unit equivalent to one of the magnetic poles in the circumferential direction of the magnet unit is defined as Wm, and a remanent flux density in the magnet unit is defined as Br, the conductor-to-conductor members are made of material meeting a relation of Wt×Bs≤Wm×Br, or wherein the conductive members are arranged at given intervals away from each other in the circumferential direction of the armature, a non-magnetic member is disposed between a respective two of the conductive members arranged adjacent each other, each of the non-magnetic members fully occupies the given interval between the conductive members.

3 . A rotating electrical machine comprising:
a magnetic field-producing unit which includes a cylindrical magnet unit, the magnet unit having a plurality of magnetic poles having North and South polarities which are alternately arranged in a circumferential direction of the magnet unit; an armature which is equipped with a multi-phase armature winding; and a rotor which is provided by one of the magnetic field-producing unit and the armature, wherein the magnet unit includes a first portion and a second portion, the first portion being located closer to a d-axis in a d-q axis coordinate system than the second position is, the second position being located closer to a q-axis in the d-q axis coordinate system than the first position is, wherein the magnet unit is magnetically oriented to meet a condition where an angle which an easy axis of magnetization of the first portion of the magnet unit makes with the d-axis is smaller than an angle which an easy axis of magnetization of the second portion of the magnet unit makes with the q-axis, wherein the magnetic field-producing unit is configured to have an intrinsic coercive

Assignees

• Denso Corp

Inventors

• Takahashi Yuki
• Taniguchi Makoto

Classifications

• H02P21/30 Primary

  Direct torque control [DTC] or field acceleration method [FAM] · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title

• H02P27/12

  pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• H02K2213/03

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