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. 27, 2005
Filed:
Aug. 11, 2004
Yu-kai Chen, Chiai, TW;
Tsai-fu Wu, Chiai, TW;
Yung-chun Wu, Kaohsiung, TW;
Wen-yang Wang, Nantou, TW;
Chin-hsiung Chang, Taichung, TW;
Yu-Kai Chen, Chiai, TW;
Tsai-Fu Wu, Chiai, TW;
Yung-Chun Wu, Kaohsiung, TW;
Wen-Yang Wang, Nantou, TW;
Chin-Hsiung Chang, Taichung, TW;
Fego Precision Industrial Co., Ltd., Taichung, TW;
Abstract
A speed adjuster is provided in a belt-disc sander for controlling the rotating speed of a motor of the belt-disc sander. A speed adjust knob is disposed outside the belt-disc sander. The speed adjuster has a control circuit, a current sensor, a drive circuit, and a converter. The current sensor detects the motor current and feeds back to the control circuit, which controls the frequency variation of a SPWM signal of the drive circuit in response to the input of the speed adjust knob. The converter transforms the square wave voltage into an AC voltage for driving the motor. The desired rotating speed can be adjusted through the speed adjust knob. The control circuit will compare the present rotating speed of the motor with the set rotating speed to determine whether the present rotating speed conforms to the set one for correcting the rotating speed of the motor.