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:
Aug. 03, 1976
Filed:
Nov. 08, 1974
Applicant:
Inventor:
Lewis William Bleiman, Northridge, CA (US);
Assignee:
Pertec Corporation, Chatsworth, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; H02K / ;
U.S. Cl.
CPC ...
274 / ; 310 / ; 318696 ;
Abstract
A system for driving a flexible magnetic disk including a direct current stepper motor having a shaft directly connected to the disk drive hub. Motor controller means activate the motor to bring it from rest up to a desired speed, e.g., 360 rpm, and thereafter maintain the speed constant. The motor controller initially provides a detent pulse to move the rotor to a starting position and then provides pulses of decreasing duration and increasing frequency to accelerate the motor to the desired speed.