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:
May. 06, 1997
Filed:
Jun. 06, 1995
Tetsuji Sakurai, Tokyo, JP;
Katsuhiko Kaida, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kanagawa-ken, JP;
Abstract
This invention relates to a motor drive control apparatus for using, for example, a spindle motor of a magnetic disk system. The inventioned apparatus achieves a motor drive control apparatus of high efficiencies with eliminating dead loss of power consumption and avoiding switching noises. The inventioned apparatus for controlling revolution drive of a motor comprising a motor including a rotor and a plurality of drive coils for defining number of excitation phases for making the rotor one cycle revolution and a current supply means for supplying a plurality of drive currents in a successive order to the plurality coils from a voltage source directly. The inventioned apparatus further includes first detecting means for detecting a rotational position of the rotor in each of the excitation phases, second detecting means for detecting number of revolution of the rotor by using a the detected rotor position signal from the first detecting means and a time setting means for determining a current supply time and a start timing for an excitation for the respective coils in each excitation phase in accordance with a detected difference between the detected number of revolution of the rotor and a predetermined target number of revolution of the rotor. The drive pulse forming circuit generates a drive pulse signal to the current supply means for supplying a plurality of drive currents to the plurality coils in accordance with the determined current supply time and a start timing for each excitation phase.