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:
Aug. 27, 2024
Filed:
Aug. 14, 2020
Hitachi Astemo, Ltd., Hitachinaka, JP;
Takafumi Hara, Tokyo, JP;
Toshiyuki Ajima, Tokyo, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Noriyuki Maekawa, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
Conventionally, there is a problem that switching loss of an inverter increases in a case where a change such as improvement in a switching frequency is involved. The battery voltage E and the torque command T* are input to the first current command generation unit. The battery voltage E, the torque command T*, and a voltage utilization rate obtained by dividing a line voltage effective value by a battery voltage (DC voltage) are input to a second current command generation unit. A magnet temperature Tmag of a rotor magnet is input to a current command selection unit, and a current command output from the first current command generation unitis selected in normal operation, and the second current command generation unitis selected in a case where the magnet temperature exceeds a predetermined value. The second current command generation unitis configured not to obtain the voltage utilization rate of 0.3 to 0.4.