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:
Apr. 28, 1998
Filed:
Jan. 19, 1995
Applicant:
Inventor:
Takahiro Hayashida, Aichi, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318599 ; 318811 ; 388805 ; 388812 ;
Abstract
An inverter control apparatus and method for a motor driven by an inverter circuit. The primary current of the motor is detected by a detector circuit and is used in combination with a primary current command value to provide pulse-width modulation of the inverter circuit. The inverter is controlled by a switching circuit that can change the PWM frequency based on any one or more factors, including motor speed, motor speed or position control mode, equivalent load factor and detected temperature.