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:
Dec. 04, 2012
Filed:
May. 17, 2007
Kenji Sugiura, Osaka, JP;
Masahiro Yasohara, Hyogo, JP;
Kenji Sugiura, Osaka, JP;
Masahiro Yasohara, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A motor driver according to the invention comprises (i) an energizing unit supplying drive voltage and drive current to a motor including a moving body and coils, (ii) a speed-position detector detecting a drive speed of the motor and a position of the moving body to output a speed position signal including drive-speed information and position information. The motor driver also includes (iii) a reference signal generator outputting a reference signal, (iv) a phase signal generator using the speed-position signal, the reference signal, and a set signal to output a phase signal indicating a phase of the supplied drive voltage, and (v) a waveforms generator using the position information and the phase signal to output a control signal to the energizing unit. A phase of the supplied drive voltage is regulated to be proportional to the drive speed, wherein a degree of the proportion is set by the set signal.