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:
Sep. 20, 2005
Filed:
Sep. 17, 2004
Akio Takemori, Kiryu, JP;
Yoshifumi Kuwano, Kiryu, JP;
Yukinari Takahashi, Kiryu, JP;
Hiroaki Taka, Kiryu, JP;
Akio Takemori, Kiryu, JP;
Yoshifumi Kuwano, Kiryu, JP;
Yukinari Takahashi, Kiryu, JP;
Hiroaki Taka, Kiryu, JP;
Japan Servo Co., Ltd., Tokyo, JP;
Abstract
A stepping motor driver comprises: an excitation angle generating means which generates an excitation angle from an external command pulse; a current control means which controls exciting currents for a stepping motor according to the excitation angle and a current command; a current detection means which detects phase currents of the stepping motor; an angle detection means which detects a rotor rotation angle of the stepping motor; a torque component current calculating means which calculates a torque component current from the phase currents and the rotor rotation angle; an absolute converting means which obtains the absolute value of the torque component current; and a current command output means which outputs the current command depending on the absolute value of the torque component current.