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:
Jul. 26, 1994
Filed:
Nov. 05, 1992
Young G Oh, Seoul, KR;
Gold Star Co., Ltd., Seoul, KR;
Abstract
A motor rotation controlling device, usable for example in a video recorder, to minimize transient phenomena at an initial operation and shorten a transient response time for detecting a rotation speed of a motor, a signal processor for constantly controlling rotation speed of the motor by the detected rotation speed supplied from the rotation detector, a comb-shaped filter for removing a rotation period component and its harmonic component included in a control signal supplied from the signal processor, a controller for varying a transfer function of the comb-shaped filter at a transient response time and a normal time according to the rotation speed of the motor, a driving device for driving a motor by the filtered control signal supplied from the comb-shaped filter, and a limit device connected between the signal processing means and the comb-shaped filter for clamping the control signal.