# US 2026/0074576 A1 · Rotor

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- Number: US 2026/0074576 A1
- Document ID: US20260074576A1
- Status: Published application
- Kind: A1
- Application number: 19/317,784
- Filed: 2025-09-03
- Published: 2026-03-12
- Earliest claimed: 2024-09-10
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Shogo SHINTANI; Minoru AWAZU
- Web page: https://patentgrep.com/patent/US20260074576A1

## CPC

- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- H02K 1/2766: {having a flux concentration effect}
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- Y02T 10/64: Electric machine technologies in electromobility
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A rotor of an embodiment includes: a rotor core in which permanent magnets are embedded; at least one first magnetic resistance portion that is formed on a side of an outer circumferential surface on a magnetic pole center axis of the rotor core; and at least a pair of second magnetic resistance portions that is formed on the side of the outer circumferential surface such that the second magnetic resistance portions sandwich the magnetic pole center axis.

## Claims

### Claim 1

A rotor comprising:
a rotor core in which permanent magnets are embedded;
at least one first magnetic resistance portion that is formed on a side of an outer circumferential surface on a magnetic pole center axis of the rotor core; and
at least a pair of second magnetic resistance portions that is formed on the side of the outer circumferential surface such that the second magnetic resistance portions sandwich the magnetic pole center axis.

### Claim 2 (depends on 1)

The rotor according to claim 1, wherein when a diameter of the rotor core is defined as D, and an area of each of the first magnetic resistance portion and the second magnetic resistance portions is defined as S, S<π(0.01 D)2 is satisfied.

### Claim 3 (depends on 2)

The rotor according to claim 2, wherein as areas of the pair of second magnetic resistance portions, the area of the second magnetic resistance portion formed on a side of a rotation direction with respect to the magnetic pole center axis is set to be larger than the area of the other second magnetic resistance portion.

### Claim 4 (depends on 1)

The rotor according to claim 1, wherein as areas of the pair of second magnetic resistance portions, the area of the second magnetic resistance portion formed on a side of a rotation direction with respect to the magnetic pole center axis is set to be larger than the area of the other second magnetic resistance portion.