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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.:

US 4837493 B1

PDFFull Text
Date of Patent:
Jun. 06, 1989

Filed:

Dec. 11, 1986

System for driving drum

Applicant:
Inventors:

Satoru Maeno, Ise, JP;

Norio Fukuyama, Ise, JP;

Tetsuo Ohishi, Ise, JP;

Senzo Kyutoku, Ise, JP;

Thutomu Nakamura, Ise, JP;

Assignee:

Shinko Electric Co., Ltd., , JP;

Attorney:

Darby & Darby

Primary Examiner:

William M Shoop, Jr

Assistant Examiner:

Saul M Bergmann

Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318685 ; 318696 ; 318721 ; 318608 ; 310 / ;
Abstract

A system for driving a drum includes a pulse motor including an annular rotor fixedly mounted within the drum for rotation therewith and rotatable relative to a stator disposed within the rotor. The pitches of the rotor teeth and stator teeth are determined in such a manner that a magnetic flux linking each of the coils is changed in a sinusoidal fashion in synchronism with the rotation of the rotor. A pole position-detecting device produces a multi-phase sinusoidal pole position-detecting signal representative of the position of the magnetic poles relative to the rotor. A speed control device produces a current amplitude command signal representative of a desired torque of the rotor. A multiplier multiplies the pole-position detecting signal by the current amplitude command signal to produce a multiplication signal. A current control device is responsive to the multiplication signal to output to the coils a drive current corresponding in amplitude to the current amplitude command signal and corresponding in phase to the pole-position detecting signal, thereby energizing the coils to rotate the rotor together with the drum relative to the stator.

Find Patent Forward Citations

Maeno, Satoru. (1989). System for driving drum (U.S. Patent No. 4837493). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4837493

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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