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. 06, 1990
Filed:
Oct. 07, 1988
Jiro Tanuma, Tokyo, JP;
Takao Uchida, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A pulse motor control apparatus for a polyphase excitation type pulse motor variably and independently controls excitation currents supplied to excitation coils. Ratios of any excitation current to other excitation currents supplied to the excitation coils are changed stepwise to rotate a composite magnetic field vector forward by those excitation coils each multiple of a real number of a predetermined unit angle at one time for controlling the rotational angle of a rotor of the pulse vector. The pulse motor control apparatus assures fine control for the rotational angle of the rotor compared with prior cases where currents supplied to a plurality of excitation coils are switched on and off for rotational control. Application of the present control apparatus to printers, etc., precludes replacement of gears, etc., due to types of print heads mounted thereon. Additional advantages such as inprovement of a torque ripple upon driving the pulse motor assure extensive application to various fields.