Compressor, heat pump device, air conditioner, and freezing machine

Patent metadata

Field	Value
Publication number	US-10027191-B2
Application number	US-201214652891-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Dec 21, 2012
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A compressor includes: a motor that includes a rotor including opposed magnets; a compression unit that compresses a refrigerant; and a crankshaft that is connected to the motor and the compression unit and is configured to transmit rotational driving of the motor to the compression unit, wherein the magnets are arranged such that the difference in magnetic force between the opposed magnets eliminates a force that deflects the crankshaft when the motor is rotationally driven.

First claim

The invention claimed is:

1. A compressor comprising:
a motor that includes a rotor including opposed magnets;
a compression unit that compresses a refrigerant; and
a crankshaft that is connected to the motor and the compression unit and is configured to transmit rotational driving of the motor to the compression unit, wherein
the rotor includes a plurality of the magnets having different magnetic forces or different lengths in a direction of a rotation axis of the rotor,
when the magnets have different magnetic forces, a magnet having a lower magnetic force among the magnets is arranged to oppose a magnet having a higher magnetic force among the magnets,
when the magnets have different lengths, a magnet having a smaller length among the magnets is arranged to oppose a magnet having a larger length among the magnets,
a first magnet and a second magnet are arranged in parallel, and the first magnet and the second magnet form one pair of adjacent magnets among the plurality of the magnets,
the first magnet and the second magnet are arranged to be displaced from each other in a direction parallel to the rotation axis,
the first magnet has a portion that is not opposed to the second magnet, and
the second magnet has a portion that is not opposed to the first magnet.

2. The compressor according to claim 1 , wherein a difference in magnetic force between the opposed magnets eliminates a force that deflects the crankshaft when the motor is rotationally driven.

3. A heat pump device comprising the compressor according to claim 1 .

4. An air conditioner comprising the heat pump device according to claim 3 .

5. A freezing machine comprising the heat pump device according to claim 3 .

6. The compressor according to claim 1 , wherein the portion of the first magnet that is not opposed to the second magnet extends from a remainder of the first magnet in a first direction of the rotation axis, and the portion of the second magnet that is not opposed to the first magnet extends from a remainder of the second magnet in a second direction of the rotational axis, wherein the first direction of the rotation axis is opposite to the second direction of the rotation axis.

Assignees

• Tsuchida Kazuchika
• Kazama Osamu
• Mitsubishi Electric Corp

Inventors

• Tsuchida Kazuchika
• Kazama Osamu

Classifications

• F25B2500/13

  Vibrations · CPC title

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title

• F25B2600/021

  Inverters therefor · CPC title

• H02K1/276 Primary

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• F04C2240/807

  Balance weight, counterweight · CPC title