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:
Dec. 29, 2009
Filed:
Jun. 28, 2007
Toshimitsu Aizawa, Kawasaki, JP;
Tsuyoshi Hosoito, Seto, JP;
Toshimitsu Aizawa, Kawasaki, JP;
Tsuyoshi Hosoito, Seto, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A motor control unit includes a power converter unit that energize a motor based on a commutating signal, the motor having a rotor provided with a permanent magnet and a stator having a coil wound thereto; a start-up controller that outputs a commutating signal to the power converter unit during a start-up operation, the commutating signal having a predetermined conductive pattern corresponding to a command rotational speed; a voltage calculator that calculates a voltage of the motor during the start-up operation by applying a parameter for the motor, the command rotational speed, and a current flown in the coil of the motor to a voltage-current equation of the motor; and a determiner that, during the start-up operation, compares a voltage calculated by the voltage calculator and an actual voltage of the motor and that determines occurrence of rotational abnormalities when the actual voltage is lower than the calculated voltage.