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.:
Date of Patent:
Apr. 18, 2017
Filed:
Dec. 23, 2011
Masatsugu Nakano, Chiyoda-ku, JP;
Yoshihito Asao, Chiyoda-ku, JP;
Satoru Akutsu, Chiyoda-ku, JP;
Ryuichi Takiguchi, Chiyoda-ku, JP;
Yuji Takizawa, Chiyoda-ku, JP;
Yu Hirotani, Chiyoda-ku, JP;
Masatsugu Nakano, Chiyoda-ku, JP;
Yoshihito Asao, Chiyoda-ku, JP;
Satoru Akutsu, Chiyoda-ku, JP;
Ryuichi Takiguchi, Chiyoda-ku, JP;
Yuji Takizawa, Chiyoda-ku, JP;
Yu Hirotani, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A permanent magnet motor in which electromagnetic excitation force of low spatial order is reduced, and influence of a magnetomotive force harmonic of a rotor and torque ripple is reduced. One set of armature windings receives current from a first inverter, and another set of armature windings receives current from a second inverter. Where a pole number of a rotor is M and the number of slots of a stator core is Q, M and Q satisfy M<Q and a greatest common divisor of M and Q is equal to or greater than 3. In the rotor, the iron core is located beyond a radius intermediate the maximum outer radius and the minimum inner radius of the permanent magnets. A phase difference between three-phase currents from the first and second inverters is in a range of electrical angles of 20 to 40 degrees.