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:
Sep. 18, 2007
Filed:
Jul. 14, 2006
Toshiyuki Ajima, Hitachi, JP;
Hideki Miyazaki, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Takao Yanai, Hitachi, JP;
Kinya Nakatsu, Hitachinaka, JP;
Toshiyuki Ajima, Hitachi, JP;
Hideki Miyazaki, Hitachi, JP;
Yoshitaka Iwaji, Hitachinaka, JP;
Takao Yanai, Hitachi, JP;
Kinya Nakatsu, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The AC motor driving apparatus comprises an inverter for supplying power to an AC motor, current sensors for detecting current that flows in the motor or inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for controlling the driving of the inverter. A current detection value detected by the current sensor and a rotor rotational position are used to estimate three-phase motor current values. The estimated motor current values are used to control the inverter. Thereby, an inexpensive, space-saving AC motor driving apparatus as well as an AC motor controller, electric actuator, or vehicle that can perform highly precise torque control from zero speed to high-speed rotation without depending on the PWM pulse pattern are provided.