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:
Apr. 23, 1985
Filed:
Feb. 07, 1983
Abstract
The invention relates to a control circuit of a pulse width modulation inverter, wherein a current control circuit to output a current control signal corresponding to a current command signal is provided, main transistors of a main circuit of the pulse width modulation inverter are switchingly controlled in response to a current control signal, whereby a driving current supplied to a motor from the pulse width modulation inverter is controlled to a value corresponding to the current command signal. The current control circuit is of such an arrangement that the current control circuit corrects the current command signal in response to the speed detection signal to compensate an error in current control due to a counter electromotive force of a DC motor, while exercising a proportional control over the driving current in accordance with a current command deviation value of a driving current detection signal from the current command signal, so that the motor can be controlled at high speed and with high accuracy.