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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9923493 B1

PDFFull Text
Date of Patent:
Mar. 20, 2018

Filed:

Jan. 09, 2014

Drive circuit for synchronous motor, synchronous motor driven by drive circuit, air blower including synchronous motor, air conditioner including air blower, and method of driving synchronous motor

Applicant:

Mitsubishi Electric Corporation, Tokyo, JP;

Inventors:

Atsushi Matsuoka, Tokyo, JP;

Kazuhiko Baba, Tokyo, JP;

Hiroyuki Ishii, Tokyo, JP;

Assignee:

MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;

Attorney:

Posz Law Group, PLC

Primary Examiner:

Rita Leykin

Int. Cl.
CPC ...
H02P 6/10 (2006.01); H02P 6/08 (2016.01); F04D 19/00 (2006.01); F04D 25/06 (2006.01); F04D 27/00 (2006.01); H02K 1/14 (2006.01); H02K 1/27 (2006.01); H02P 27/08 (2006.01); H02K 29/03 (2006.01); H02K 3/28 (2006.01); H02P 6/15 (2016.01); F04D 29/66 (2006.01);
U.S. Cl.
CPC ...
H02P 6/10 (2013.01); F04D 19/002 (2013.01); F04D 25/06 (2013.01); F04D 27/004 (2013.01); F04D 29/661 (2013.01); H02K 1/14 (2013.01); H02K 1/2706 (2013.01); H02K 3/28 (2013.01); H02K 29/03 (2013.01); H02P 6/085 (2013.01); H02P 6/15 (2016.02); H02P 27/08 (2013.01);
Abstract

A drive circuit for a synchronous motor including a rotor having ten magnetic poles formed by a permanent magnet, and a stator in which a winding is wound in a concentrated manner around nine teeth facing the rotor, the drive circuit including: an inverter including a plurality of switching elements in bridge connection; and a control unit that controls the inverter in such a manner that a square-wave-shaped current flows to the winding, wherein the control unit operates in such a manner that an energization phase at which to pass the square-wave-shaped current falls within a range of electric angles of −10° to +5° from an energization phase at which the current is minimum when a target torque of the synchronous motor is generated.

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