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. 23, 2001
Filed:
Feb. 23, 1999
Yasusuke Iwashita, Yamanashi, JP;
Tokuhisa Matsukane, Yamanashi, JP;
Fanuc Limited, Yamanashi, JP;
Abstract
A motor controller for controlling currents flowing to a motor by the PWM system includes interruption-restart controller for interrupting supply of PWM commands for at least one phase when the actual current flowing in at least one motor phase has exceeded a specified value, and for thereafter restarting PWM command supply. When the actual current flowing to the motor has reached a previously determined anomalous level, control is performed to interrupt and restart supply of PWM commands. By interrupting the supply of the PWM commands, the current flowing to the motor is returned from an anomalous level to a normal level and the equipment protected. After the motor current is returned to a normal level by the interruption of PWM command supply, PWM command supply is resumed, normal control by PWM command is again performed, and a non-controlling state in the controller is avoided.