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:
Nov. 03, 2009
Filed:
Aug. 10, 2007
Toru Ando, Aichi, JP;
Tomohisa Kameyama, Aichi, JP;
Toru Ando, Aichi, JP;
Tomohisa Kameyama, Aichi, JP;
Okuma Corporation, Aichi, JP;
Abstract
A synchronous motor control device having an optimal protection function in accordance with an operational state of a motor is provided. The motor control device includes a position detecting sensor detecting an angular position of a motor, a speed controller controlling the speed of the motor based on the angular position of the motor detected by the position detecting sensor, a temperature estimation component that estimates the temperature of the motor from a current command value calculated by the speed controller or a torque command value and, when the estimated temperature reaches a threshold, outputs a current cutoff signal to a current controller that cuts off passage of current to the motor, and an operational state determination part determining an operational state of the motor based on the angular position of the motor detected by the position detecting sensor, wherein the temperature estimation component changes the threshold based on the operational state of the motor determined by the operational state determination component.