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. 27, 1977
Filed:
Mar. 05, 1976
Kinji Tanikoshi, Kawasaki, JA;
Canon Kabushiki Kaisha, Tokyo, JA;
Canon Seiki Kabushiki Kaisha, Tokyo, JA;
Abstract
This specification discloses a Hall motor control system in which Hall elements detect the position of a rotor comprising a permanent magnet to switch over driving currents flowing to driving coils. Induced voltages produced in the driving coils or the voltage detecting coils by rotation of the motor are synthesized by a diode, and the resultant voltage is level-shifted by a level shift circuit including a transistor, and then compared with a reference speed voltage. To control the input to the Hall elements by the comparison output and provide a constant speed of rotation, there are provided temperature compensating means formed by diodes in the base circuit of the transistor of the level shift circuit and in the reference speed voltage circuit, respectively.