MOTOR, COMPRESSOR, REFRIGERATING AND AIR CONDITIONING APPARATUS, AND METHOD FOR MANUFACTURING MOTOR

• US 20190319509A1
• Filed: 08/10/2016
• Published: 10/17/2019
• Est. Priority Date: 08/10/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: ISHIKAWA, Atsushi
• Granted Patent: US 10,916,989 B2
• Time in Patent Office: Days
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2313/0292 related to reversing valves
• CPC Class Codes: F25B 2400/07 Details of compressors or related parts
• CPC Class Codes: F25B 31/026 with compressor of rotary type
• CPC Class Codes: F25B 49/02 for compression type machines, plants or systems
• CPC Class Codes: F25B 49/022 Compressor control arrangements
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 15/14 Casings; Enclosures; Supports
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures
• CPC Class Codes: H02K 2201/03 Machines characterised by aspects of the air-gap between rotor and stator
• CPC Class Codes: H02K 2207/03 Tubular motors, i.e. rotary motors mounted inside a tube, e.g. for blinds
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 5/02 Casings or enclosures characterised by the material thereof
• CPC Class Codes: H02K 5/04 Casings or enclosures characterised by the shape, form or construction thereof
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

A motor is provided in a shell. The motor includes a stator having an outer peripheral surface facing an inner peripheral surface of the shell, a rotor rotatably disposed inside the stator, and a nonmagnetic film disposed between the outer peripheral surface of the stator and the inner peripheral surface of the shell.

Claims

1. A motor disposed in a shell, the motor comprising:

a stator having an outer peripheral surface facing an inner peripheral surface of the shell;

a rotor rotatably disposed inside the stator; and

a nonmagnetic film disposed between the outer peripheral surface of the stator and the inner peripheral surface of the shell,

wherein the nonmagnetic film is disposed over an entire area of the outer peripheral surface of the stator.

3. The motor according to claim 1, wherein the nonmagnetic film is composed of a resin.

4. The motor according to claim 3, wherein the nonmagnetic film is composed of polyethylene terephthalate.

5. The motor according to claim 4, wherein the nonmagnetic film has a thickness in a range of 75 μ

m to 300 μ

m.

6. The motor according to claim 4 or 5, wherein when a gap between the stator and the rotor is expressed as G, a thickness T of the nonmagnetic film satisfies:

0.15≤

T/G≤

0.6.

7. The motor according to claim 3, wherein the nonmagnetic film is composed of polyethylene naphthalate.

8. The motor according to claim 7, wherein the nonmagnetic film has a thickness in a range of 12 μ

m to 250 μ

m.

9. The motor according to claim 7 or 8, wherein when a gap between the stator and the rotor is expressed as G, a thickness T of the nonmagnetic film satisfies:

0.024≤

T/G≤

0.5.

10. The motor according to claim 1, wherein the nonmagnetic film is fixed to the outer peripheral surface of the stator.

11. The motor according to claim 1, wherein the nonmagnetic film is fixed to the inner peripheral surface of the shell.

13. A compressor comprising a closed container having a shell, a compression mechanism disposed in the closed container, and the motor according to claim 1 driving the compression mechanism.

14. A refrigerating and air conditioning apparatus comprising a compressor, a condenser, a decompressor, and an evaporator,

the compressor comprising a closed container having a shell, a compression mechanism disposed in the closed container, and the motor according to claim 1 driving the compression mechanism.

2. (canceled)

12. A motor disposed in a shell, the motor comprising:

a stator having an outer peripheral surface facing an inner peripheral surface of the shell;

a rotor rotatably disposed inside the stator; and

a nonmagnetic film disposed between the outer peripheral surface of the stator and the inner peripheral surface of the shell,

wherein the outer peripheral surface of the stator has a contact surface which is in contact with the inner peripheral surface of the shell, and a non-contact surface which is not in contact the inner peripheral surface, and

wherein the nonmagnetic film is disposed between the contact surface and the inner peripheral surface of the shell and is not disposed between the non-contact surface and the inner peripheral surface of the shell.

17. A compressor comprising a closed container having a shell, a compression mechanism disposed in the closed container, and the motor according to claim 12 driving the compression mechanism.

18. A refrigerating and air conditioning apparatus comprising a compressor, a condenser, a decompressor, and an evaporator,

the compressor comprising a closed container having a shell, a compression mechanism disposed in the closed container, and the motor according to claim 12 driving the compression mechanism.

15. A method for manufacturing a motor, the method comprising the steps of:

preparing a stator;

attaching a nonmagnetic film on an outer peripheral surface of the stator;

fitting the stator into a shell by shrink fitting to dispose the nonmagnetic film between the outer peripheral surface of the stator and an inner peripheral surface of the shell; and

mounting a rotor inside the stator.

16. The method for manufacturing a motor according to claim 15, wherein the nonmagnetic film has a tubular shape and flexibility, and

wherein, in the step of attaching the nonmagnetic film on the outer peripheral surface of the stator, the nonmagnetic film is attached so as to cover the outer peripheral surface of the stator.