# US 2025/0167652 A1 · Low-torque ripple synchronous reluctance motor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2025/0167652 A1
- Document ID: US20250167652A1
- Status: Published application
- Kind: A1
- Application number: 18/809,557
- Filed: 2024-08-20
- Published: 2025-05-22
- Earliest claimed: 2023-11-16
- Assignees: National Ilan University
- Applicants: National Ilan University
- Inventors: Cheng-Hu CHEN; Jun-Wei XU
- Web page: https://patentgrep.com/patent/US20250167652A1

## CPC

- H02K 1/246: {Variable reluctance rotors}
- H02K 19/02: Synchronous motors
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Provided is a low-torque ripple synchronous reluctance motor, including: a stator, including a plurality of stator slots and a plurality of stator teeth, each of the stator teeth including a stator tooth center; and a rotor, including a plurality of motor poles, each of the motor poles including a plurality of rotor barriers, the rotor barriers including a first rotor barrier to an n-th rotor barrier; a first rotor barrier end center line and a corresponding stator tooth center line defining a first included angle (θb), an n-th rotor barrier end center line and a corresponding stator tooth center line defines an included angle (θn), (θn)=[(n−1)×k+1]×θb, the real number (k) is any value within the range of 2±0.5, and the formula of the first included angle (θb) is any value within the range of the first included angle (θb)=36/Ns±0.5°, Ns is the number of stator slots.

## Claims

### Claim 1

A low-torque ripple synchronous reluctance motor, including:
a stator, including a plurality of stator slots and a plurality of stator teeth, each of the stator teeth including a stator tooth center; and
a rotor, including a plurality of motor poles, each of the motor poles including a plurality of rotor barriers, the rotor barriers including a first rotor barrier to an n-th rotor barrier, the first rotor barrier including a first rotor barrier end center, the n-th rotor barrier includes an n-th rotor barrier end center, where n is a positive integer greater than 1;
wherein, a first rotor barrier end center line is defined between the first rotor barrier end center and a center of the rotor include, a stator tooth center line is defined between the stator tooth center and the center of the rotor, and the first rotor barrier end center line and a corresponding stator tooth center line defines a first included angle (θb);
wherein an n-th rotor barrier end center line is defined between the n-th rotor barrier end center and the center of the rotor, and the n-th rotor barrier end center line and a corresponding stator tooth center line defines an included angle (θn);
wherein the formula of the included angle (θn) is: (θn)=[(n−1)×k+1]×θb, the real number (k) is any value within the range of 2±0.5, and the formula of the first included angle (θb) is any value within the range of the first included angle (θb)=36/Ns±0.5°, Ns is the number of stator slots.

### Claim 2 (depends on 1)

The low-torque ripple synchronous reluctance motor according to claim 1, wherein the number of stator slots (Ns) is 24, and each of the motor poles includes two or three rotor barriers.

### Claim 3 (depends on 1)

The low-torque ripple synchronous reluctance motor according to claim 1, wherein the number of stator slots (Ns) is 36, and each of the motor poles includes three or four rotor barriers.

### Claim 4 (depends on 1)

The low-torque ripple synchronous reluctance motor according to claim 1, wherein the number of stator slots (Ns) is 48, and each of the motor poles includes four, five or six rotor barriers.

### Claim 5 (depends on 1)

The low-torque ripple synchronous reluctance motor according to claim 1, wherein the included angle (θn) includes a deviation of any value within the range of ±72/Ns°.