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. 27, 2012
Filed:
Jun. 25, 2008
Kesatoshi Takeuchi, Shiojiri, JP;
Takafumi Suzuki, Nagoya, JP;
Kesatoshi Takeuchi, Shiojiri, JP;
Takafumi Suzuki, Nagoya, JP;
Seiko Epson Corporation, , JP;
Abstract
A drive control circuit includes: an original drive signal generator generating an original drive signal based on a positional signal indicating a relative position of a first member and a second member of an electric motor; an excitation ratio signal generator generating an excitation ratio signal indicating a ratio of excitation interval to non-excitation interval of coils of the electric motor based on a speed signal indicating a relative speed of the first member and the second member of the electric motor; an excitation interval signal generator generating a binary excitation interval signal specifying the excitation interval and the non-excitation interval of the coils of the electric motor based on the positional signal and the excitation ratio signal; and a mask circuit generating a drive signal for driving the electric motor by masking part of the original drive signal based on the excitation interval signal.