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:
Jan. 30, 2024
Filed:
Jul. 01, 2019
Nippon Steel Corporation, Tokyo, JP;
Yasuo Ohsugi, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A motor can be driven so that the total loss of a loss of a motor and a loss of an inverter decreases. In a relationship between an optimum carrier frequency at which the total loss is minimized and a torque of a motor M, a lowest value of the optimum carrier frequency is derived, and a relationship between the torque of the motor M and the carrier frequency is determined to have a portion in which the carrier frequency is substantially constant or decreases as the torque of the motor M increases in a range equal to or less than the torque of the motor M corresponding to the lowest optimum carrier frequency and a portion in which the carrier frequency is substantially constant or increases as the torque of the motor M increases in a range equal to or more than the torque of the motor M corresponding to the lowest optimum carrier frequency.