Electric motor and turbo-compressor

Patent metadata

Field	Value
Publication number	US-11575293-B2
Application number	US-201816760691-A
Country	US
Kind code	B2
Filing date	Oct 25, 2018
Priority date	Oct 31, 2017
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

The stator includes a stator core, a support electric wire formed by one or more conductive wires, and a drive electric wire formed by one or more conductive wires. The stator core includes an annular shaped back yoke and a plurality of teeth on an inner periphery of the back yoke. The support electric wire is disposed so as to pass through a plurality of slots respectively formed between the teeth, and forms a winding portion that generates an electromagnetic force for supporting the rotor in a non-contact manner by being energized. The drive electric wire is disposed so as to pass through the plurality of slots, and forms a winding portion that generates an electromagnetic force for rotating the rotor by being energized. A cross-sectional area per conductive wire of the support electric wire differs from a cross-sectional area per conductive wire of the drive electric wire.

First claim

What is claimed is:

1. An electric motor comprising:
a rotor; and
a stator, the stator including
a stator core that includes a back yoke having an annular shape and a plurality of teeth provided on an inner periphery of the back yoke,
a support electric wire formed by a bundle of conductive wires, the support electric wire
being disposed so as to pass through a plurality of slots respectively formed between the plurality of teeth, and
forming a winding portion that generates an electromagnetic force for supporting the rotor in a non-contact manner by being energized, and

a drive electric wire formed by a bundle of conductive wires, the drive electric wire
being disposed so as to pass through the plurality of slots, and
forming a winding portion that generates an electromagnetic force for rotating the rotor by being energized,

a cross-sectional area per conductive wire of the conductive wires in the bundle forming one of the support electric wire and the drive electric wire is smaller than a cross-sectional area per conductive wire of the conductive wires in the bundle forming the other of the support electric wire and the drive electric wire, and
the bundle forming the one of the support electric wire and the drive electric wire including a larger number of conductive wires than the bundle forming, the other of the support electric wire and the drive electric wire.

2. The electric motor according to claim 1 , wherein
a ratio of a sum of cross-sectional areas of the conductive wires thereof that pass through each of the slots to a cross-sectional area of the slot is smaller for the bundle forming, the one of the support electric wire and the drive electric wire than for the bundle forming the other of the support electric wire and the drive electric wire.

3. The electric motor according to claim 1 , wherein
a sum of cross-sectional areas of the conductive wires of the bundle forming the one of the support electric wire and the drive electric wire is smaller than a sum of cross-sectional areas of the conductive wires of the bundle forming the other of the support electric wire and the drive electric wire.

4. The electric motor according to claim 1 , wherein
at least the support electric wire includes plurality of support electric wires and a number of the plurality of support electric wires is larger than a number of the drive electric wire, or
at least the drive electric wire includes a plurality of drive electric wires and a number of the plurality of drive electric wires is than ager number of the support electric wire.

5. The electric motor according to claim 1 , wherein
the cross-sectional area per conductive wire of the bundle forming the support electric wire is smaller than the cross-sectional area per conductive wire of the bundle forming the drive electric wire.

6. The electric motor according, to claim 1 , wherein
a part or an entirety of a coil end portion of the one of the support electric wire and the drive electric wire is covered by a part or an entirety of a coil end portion of the other of the support electric wire and the drive electric wire.

7. The electric motor according to claim 6 , wherein
the other of the support electric wire and the drive electric wire is formed by a segment coil.

8. The electric motor according to claim 1 , wherein
the support electric wire and the drive electric wire are disposed adjacent to each other in a circumferential direction of the stator.

9. The electric motor according to claim 8 , wherein
the support electric wire and the drive electric wire are disposed in such a way that
a part or an entirety of the one of the support electric wire and the drive electric wire is covered by a part or an entirety of the other of the support electric wire and the drive electric wire.

10. A turbo-compressor including the electric motor according to claim 1 , the turbo compressor further comprising:
a drive shaft rotated by the electric motor; and
an impeller coupled to the drive shaft.

11. The electric motor according to claim 2 , wherein
the cross-sectional area per conductive wire of the bundle forming the support electric wire is smaller than the cross-sectional area per conductive wire of the bundle forming the drive electric wire.

12. The electric motor according to claim 2 , wherein
a part or an entirety of a coil end portion of the one of the support electric wire and the drive electric wire is covered by a part or an entirety of a coil end portion of the other of the support electric wire and the drive electric wire.

13. The electric motor according to claim 3 , wherein
the cross-sectional area per conductive wire of the bundle forming the support electric wire is smaller than the cross-sectional area per conductive wire of the bundle forming, the drive electric wire.

14. The electric motor according to claim 3 , wherein
a part or an entirety of a coil end portion of the one of the support electric wire and the drive electric wire is covered by a pan or an entirety of a coil end portion of the other of the support electric wire and the drive electric wire.

15. The electric motor according to claim 4 , wherein
the cross-sectional area per conductive wire of the bundle forming; the support electric wire is smaller than the cross-sectional area per conductive wire of the bundle forming the drive electric wire.

16. The electric motor according to claim 4 , wherein
a part or an entirety of a coil end portion of the one of the support electric wire and the drive electric wire is covered by a part or an entirety of a coil end portion of the other of the support electric wire and the drive electric wire.

17. The electric motor according to claim 1 , wherein
the one of the support electric wire and the drive electric wire is disposed radially outward relative to the other of the support electric wire and drive electric wire.

18. The electric motor according to claim 17 , wherein
the support electric wire includes a plurality of support electric wires, and
the drive electric wire includes a plurality of drive electric wires.

19. The electric motor according to claim 18 , wherein
the plurality of support electric wires is disposed radially outward relative to the plurality of drive electric wires.

20. The electric motor according to claim 1 , wherein
at least two of the conductive wires in the bundle forming the support electric wire are disposed adjacent to each other in a circumferential direction of the stator, and
at least two of the conductive wires in the bundle forming the drive electric wire are disposed adjacent to each other in a circumferential direction of the stator.

21. The electric motor according to claim 1 , wherein
the one of the support electric wire and the drive electric wire having a smaller space factor than the other of the support electric wire and the drive electric wire.

22. The electric motor according to claim 8 , wherein
the support electric wire includes a plurality of support electric wires disposed along a radial direction of the stator, and
the drive electric wire includes a plurality of drive electric wires disposed along the radial direction of the stator,
the plurality of support electric wires and the plurality of drive electric wires being disposed adjacent to each other in the circumferential direction of the stator.

Assignees

• Daikin Ind Ltd

Inventors

• Ono Takaaki
• Irino Yusuke
• Tonari Tatsuya
• Nakazawa Yuji
• Aota Keiji
• Sakawaki Atsushi

Classifications

• H02K1/2746

  the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• H02K3/12

  arranged in slots · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• F02B39/10

  electric · CPC title