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:
Apr. 03, 2012
Filed:
Jul. 23, 2010
Shigen Yasunaka, Kawasaki, JP;
Satoshi Kuwahara, Fuchu, JP;
Shinji Takakura, Yokohama, JP;
Yoshiyuki Ishihara, Kawasaki, JP;
Shigen Yasunaka, Kawasaki, JP;
Satoshi Kuwahara, Fuchu, JP;
Shinji Takakura, Yokohama, JP;
Yoshiyuki Ishihara, Kawasaki, JP;
Kabushiki Kaisha Toshiba, , JP;
Abstract
According to one embodiment, an estimation method comprises measuring and creating. The measuring is configured to measure a head velocity and a terminal voltage of a coil of a voice coil motor at least two times before unload in a control system eliminating an influence caused by a transient response of inductance of the voice coil motor. The calculating is configured to a calculate torque constant and a coil resistance based on command voltages and at least two measured head velocities and terminal voltages of the coil.