Motor and compressor

• US 10,256,685 B2
• Filed: 11/06/2012
• Issued: 04/09/2019
• Est. Priority Date: 11/10/2011
• Status: Active Grant

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Higuchi, Dai
• Primary Examiner(s): Desai, Naishadh
• Application Number:
  US13/669,531
• Publication Number:
  US 20130119805A1
• Time in Patent Office: 2,345 Days
• Field of Search: 31015609, 31015619, 31015636-15638, 31015643, 31015645, 31015647-15649, 31015653, 31015655-15657, 310216008, 310216011, 310216013, 310216016, 310216096, 31015607, 31015678
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

A motor having improved heat resistance is provided. The motor includes a rotor comprising a rotor core, two or more slots arranged in a circumferential direction of the rotor in the rotor core, two magnets in a plate shape having a thickness in a radial direction of the rotor, and divided and arranged in the circumferential direction in each of the two or more slots, and a spacer for dividing the two magnets; and a stator disposed outside of the rotor in the radial direction with a clearance from the rotor and comprising a stator core having two or more slots wound with one or more winding wires; and the two magnets are separated from each other by the spacer, by a distance which is 10% to 50% of a circumferential length of the slot having the two magnets.

Claims

1. A motor, comprising:

a rotor comprising a rotor core, two or more first slots arranged in a circumferential direction of the rotor in the rotor core, two magnets in a plate shape having a thickness in a radial direction of the rotor, and divided and arranged in the circumferential direction in each of the two or more first slots, and a spacer for dividing the two magnets; and

a stator disposed outside of the rotor in the radial direction with a clearance from the rotor and comprising a stator core having two or more second slots wound with one or more winding wires;

wherein an opening of each of the two or more first slots has a substantially rectangular shape, wherein two opposite sides of the opening are perpendicular to a radial direction of the rotor,

wherein the two magnets have the same magnetic pole of S or N in their radially outer side and the same magnetic pole of N or S in their radially inner side, and are separated from each other by the spacer, by a distance which is 10% to 50% of a circumferential length of the slot having the two magnets,

wherein the spacer is a non-magnetic solid material that occupies all of a gap between the two magnets, and

wherein the motor is an interior permanent magnet motor.

2. The motor according to claim 1, wherein the spacer is formed of aluminum material.

3. The motor according to claim 1, wherein the two magnets have the same shape.

4. A compressor comprising the motor according to claim 1.

5. A compressor comprising the motor according to claim 2.

6. A compressor comprising the motor according to claim 3.