SUPERCONDUCTING ELECTRIC MOTOR

• US 20120161556A1
• Filed: 12/12/2011
• Published: 06/28/2012
• Est. Priority Date: 12/28/2010
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: MIZUTANI, Ryoji, Ohashi, Yoshimasa, Okumura, Nobuo, Ishida, Kenji
• Application Number:
  US13/323,047
• Publication Number:
  US 20120161556A1
• Time in Patent Office: Days
• US Class Current: 310/64
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 55/02 of the synchronous type

Abstract

A superconducting electric motor includes: a rotor rotatably arranged; a stator arranged in a radial direction of the rotor to face the rotor; and a refrigerator having at least one narrow tube that flows low-temperature refrigerant inside. The stator has a plurality of superconducting coils wound at a radial end portion of a stator core and formed of a superconducting wire material. The at least one narrow tube has a core penetrating portion that is provided to penetrate through the stator core. Alternatively, the refrigerator has a plurality of narrow tubes, and at least part of each narrow tube is provided in the stator core. Connecting portions that are refrigerant supply/drain connecting portions at both ends of each of the plurality of narrow tubes are provided on both axial sides of the stator at opposite sides in a diametrical direction with respect to a rotation central axis of the rotor.

Claims

1. A superconducting electric motor comprising:

a rotor that is rotatably arranged;

a stator that is arranged in a radial direction of the rotor so as to face the rotor; and

a refrigerator that has at least one narrow tube that flows low-temperature refrigerant inside, wherein

the stator has a stator core and a plurality of superconducting coils that are wound at a radial end portion of the stator core and that are formed of a superconducting wire material, and

the at least one narrow tube has a core penetrating portion that is provided so as to penetrate through the stator core.

2. The superconducting electric motor according to claim 1, wherein

the stator core has an annular back yoke, a plurality of teeth that radially protrude from a radial end portion of the back yoke, and slots, each of which is provided between two of the teeth that are adjacent in a circumferential direction of the stator,

the superconducting coils are respectively wound around the teeth, and

the core penetrating portion is provided so as to penetrate through the back yoke.

3. The superconducting electric motor according to claim 1, wherein

the stator core has an annular back yoke, a plurality of teeth that radially protrude from a radial end portion of the back yoke, and slots, each of which is provided between two of the teeth that are adjacent in a circumferential direction of the stator,

the superconducting coils are respectively wound around the teeth, and

the core penetrating portion is provided so as to penetrate through one of the teeth.

4. The superconducting electric motor according to claim 1, wherein

the stator core has an annular back yoke, a plurality of teeth that radially protrude from a radial end portion of the back yoke, and slots, each of which is provided between two of the teeth that are adjacent in a circumferential direction of the stator,

the superconducting coils are respectively wound around the teeth, and

the refrigerator has a first narrow tube and a second narrow tube, each of which flows low-temperature refrigerant inside,

the first narrow tube has a first core penetrating portion that is provided so as to penetrate through the back yoke, and

the second narrow tube has a second core penetrating portion that is provided so as to penetrate through one of the teeth.

5. A superconducting electric motor comprising:

a rotor that is rotatably arranged;

a stator that is arranged in a radial direction of the rotor so as to face the rotor; and

a refrigerator that has a plurality of narrow tubes that flow low-temperature refrigerant inside, wherein

the stator has a stator core and a plurality of superconducting coils that are respectively wound around multiple radial end portions of the stator core arranged in a circumferential direction of the stator core and that are formed of a superconducting wire material,

at least part of each of the plurality of narrow tubes is provided in the stator core, and

a one-side connecting portion and an other-side connecting portion that are refrigerant supply/drain connecting portions at both ends of each of the plurality of narrow tubes are respectively provided on both axial sides of the stator at opposite sides in a diametrical direction with respect to a rotation central axis of the rotor.

6. The superconducting electric motor according to claim 5, wherein

the stator core has an annular back yoke, a plurality of teeth that radially protrude from a radial end portion of the back yoke, and slots, each of which is provided between two of the teeth that are adjacent in a circumferential direction of the stator,

the plurality of superconducting coils are respectively wound around the plurality of teeth, and

the plurality of narrow tubes each have an in-slot portion that is arranged in a corresponding one of the plurality of slots.

7. The superconducting electric motor according to claim 6, wherein

each of the plurality of in-slot portions is only in contact with one or two of the superconducting coils in a corresponding one of the slots.

8. The superconducting electric motor according to claim 6, wherein

each of the plurality of in-slot portions is only in contact with the stator core in a corresponding one of the slots.

9. The superconducting electric motor according to claim 6, wherein

each of the plurality of in-slot portions is in contact with the stator core and one or two of the superconducting coils in a corresponding one of the slots.

10. The superconducting electric motor according to claim 6, wherein

the refrigerator has the plurality of narrow tubes of which the number is at least equal to the number of the slots.

11. The superconducting electric motor according to claim 6, wherein

the in-slot portions are arranged in each of the slots in equal numbers.

12. The superconducting electric motor according to claim 6, wherein

the plurality of narrow tubes of which the number is equal to the number of the teeth are provided, and

each of the plurality of narrow tubes has a core penetrating portion that penetrates through a corresponding one of the teeth.

13. The superconducting electric motor according to claim 5, wherein

the plurality of narrow tubes respectively have core penetrating portions that axially penetrate through at positions spaced apart from each other in a circumferential direction of the stator core.