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. 02, 2007
Filed:
Sep. 25, 2003
Kozo Ide, Fukuoka, JP;
Mitsujiro Sawamura, Fukuoka, JP;
Mengesha Mamo Wogari, Fukuoka, JP;
Jun Oyama, Nagasaki, JP;
Kozo Ide, Fukuoka, JP;
Mitsujiro Sawamura, Fukuoka, JP;
Mengesha Mamo Wogari, Fukuoka, JP;
Jun Oyama, Nagasaki, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
It is an object of the invention to provide an apparatus for estimating a magnetic pole position of a motor in which the amplitudes of high-frequency currents can be adjusted. In the invention, a controlling apparatus for driving a motor (-) by a voltage source PWM inverter (-), and controlling a torque and speed, or torque, speed, and position of the motor has: means for switching over first means for producing an arbitrary phase difference in PWM carrier signals between respective two phases such as UV, VW, or WU of three or UVW phases, and second means for causing the phase difference between two phases such as V, VW, or WU of three or UVW phases to become zero; means for extracting high-frequency currents in a same frequency band as carrier signals generated by it, from estimated currents; and means (-) for estimating a magnetic pole position by using the extracted high-frequency currents.