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:
Mar. 27, 2012
Filed:
Dec. 15, 2008
You-ren Lin, Taipei Hsien, TW;
Rong-cong Hung, Taipei Hsien, TW;
Shen-an Chen, Taipei Hsien, TW;
Rong-hwang Horng, Taipei Hsien, TW;
Shih-chang Chen, Taipei Hsien, TW;
Yaw-shen Lai, Taipei Hsien, TW;
You-Ren Lin, Taipei Hsien, TW;
Rong-Cong Hung, Taipei Hsien, TW;
Shen-An Chen, Taipei Hsien, TW;
Rong-Hwang Horng, Taipei Hsien, TW;
Shih-Chang Chen, Taipei Hsien, TW;
Yaw-Shen Lai, Taipei Hsien, TW;
Foxnum Technology Co., Ltd., Tu-Cheng, New Taipei, TW;
Abstract
A device for controlling an induction motor includes a voltage/frequency controller, a pulse width modulation controller, and a converter. The voltage/frequency controller receives a controlling frequency, and outputs a controlling voltage corresponding to the controlling frequency. The pulse width modulation controller receives the controlling voltage and the controlling frequency, and generates PWM signals according to the controlling voltage and the controlling frequency. The converter receives the PWM signals, and controls the induction motor according to the PWM signals. There is a predetermined relationship between the controlling voltage and the controlling frequency stored in the voltage/frequency controller. The controlling voltage is greater than zero in response to the controlling frequency being zero, and increasing the controlling frequency increases the controlling voltage as in the predetermined relationship.