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:
Mar. 28, 2006
Filed:
Aug. 02, 2004
Kenji Suzuki, Anjo, JP;
Hiromichi Agata, Anjo, JP;
Tatsuyuki Uechi, Anjo, JP;
Aisin AW Co., Ltd., Anjo, JP;
Abstract
A synchronous-motor controller including an inverter for converting direct current to alternating current in order to supply a synchronous motor with a current responsive to a torque instruction value, a temperature sensor for measuring a temperature of the inverter and a control unit. The control unit detects a locking of the synchronous motor although current is supplied to the synchronous motor and calculates, based on the torque instruction value, a heating value of a switching element of the inverter at the time when the switching element is supplied with the current after the synchronous motor is in a locked condition, wherein a temperature of the switching element is estimated by adding the calculated heating value to an initial value of the temperature of the inverter measured by the temperature sensor when the locking of the synchronous motor is detected.