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:
Oct. 13, 1998
Filed:
Jan. 21, 1997
Nicholas Anderson, Queen, NY (US);
Power Efficiency Corp., Hackensack, NJ (US);
Abstract
A balanced and synchronized phased detector circuit is provided for a three phase power controller for AC induction motors. The power controller includes a thyristor or switching element for each motor phase winding between a line phase terminal of a three power line and the motor's input terminals, and decides the sequence for firing the thyristors. The phase detector includes a dividing resistor network between each phase's line terminal and the front-end operational amplifiers used in the phase detector, and an adjustable dividing resistor network between each motor terminal and the front-end operational amplifiers. The resistor networks allow a differential voltage to be set between the phase line terminal and the motor terminal for each phase, to a voltage appropriate for firing the respective thyristor. By allowing control over the front-end differential voltage, the phase detector virtually elements vibrations encountered during operation of the motor.