Rotor of rotary electric machine

Patent metadata

Field	Value
Publication number	US-11329538-B2
Application number	US-202016855013-A
Country	US
Kind code	B2
Filing date	Apr 22, 2020
Priority date	Apr 23, 2019
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

According to one embodiment, in a lateral cross section, a rotor core includes a plurality of layers of barrier regions formed to be arranged in a radial direction with intervals in each magnetic pole. Each barrier region includes a flux barrier extending from near a part of an outer circumferential surface through d axis to near another part thereof. At least a flux barrier of a barrier region provided at an outermost circumferential surface side is filled with a nonmagnetic conductive material. A barrier-side edge on a side of the central axis, which defines the flux barrier of the barrier region provided in an outermost circumferential surface side is located within a range of 0.55<2a/R2 <0.84.

First claim

What is claimed is:

1. A rotor of a rotary electric machine, comprising:
a shaft rotatable around a central axis; and
a rotor core comprising a plurality of magnetic poles arranged in a circumferential direction around the central axis, and coaxially fixed to the shaft,
when, in a lateral cross section of the rotor core, normal to the central axis, an axis extending through a boundary between adjacent magnetic poles and the central axis is defined as a d axis and an axis magnetically intersecting perpendicular to the d axis is defined as a q axis,
the rotor core comprising a plurality of layers of barrier regions formed to be arranged in a radial direction with intervals respectively therebetween, in the plurality of magnetic poles, and
the plurality of barrier regions each comprising a flux barrier extending from near a part of an outer circumferential surface of the rotor core through the d axis to near another part of the outer circumferential surface, a first bridge portion formed of an iron core located between one end of the flux barrier and the outer circumferential surface and a second bridge portion formed of an iron core located between an other end of the flux barrier and the outer circumferential surface, and at least a flux barrier of a barrier region provided at an outermost circumferential surface side being filled with a nonmagnetic conductive material, and
when a radius of a circle circumscribed on the outer circumferential surface is represented by R and an equation of a hyperbola X coordinates and Y coordinates of which are two q axes adjacent to each other in the circumferential direction is defined as xy−a=0,
a barrier-side edge on a side of the central axis, which defines the flux barrier of the barrier region provided in an outermost circumferential surface side being located within a range of 0.55<2a/R 2 <0.84.

2. The rotor of claim 1 , wherein
the barrier-side edge on the side of the central axis is located within a range of 0.55<2a/R 2 <0.78.

3. The rotor of claim 1 , wherein
each of the plurality of barrier regions is curved in a convex manner toward the central axis.

Assignees

• Toshiba Infrastructure Systems & Solutions Corp
• Toshiba Ind Products & Systems Corp

Inventors

• Takeuchi Katsutoku
• Matsushita Makoto
• Yamamoto Yuji
• Matsumoto Masaaki

Classifications

• H02K19/14 Primary

  having additional short-circuited windings for starting as asynchronous motors · CPC title

• H02K19/02

  Synchronous motors · CPC title

• H02K2213/03

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

• H02K1/246 Primary

  Variable reluctance rotors · CPC title

• H02K1/22 Primary

  Rotating parts of the magnetic circuit · CPC title