Title:
SPEED DETECTOR OF MOTOR
Document Type and Number:
Japanese Patent JPS60134748
Kind Code:
A
Abstract:
PURPOSE:To eliminate the necessity of mounting a magnetic unit on a rotational shaft by opposing a Hall element on the pole of a rotor and detecting the magnetic flux of the rotor. CONSTITUTION:A Hall element 17 is mounted on the inner surface of a motor case 7 in a peripheral gap 19 of a stator magnet 15. When power is supplied to a terminal connected with a brush 16, a winding 14 is excited, a magnetic flux is generated from the pole 21 of a rotor core 12, and a rotor 13 and a rotational shaft 11 are rotated by the mutual action with the magnet 15. Since the pole 21 crosses the front surface of the element 17 as the rotor 13 rotates. An output corresponding to the rotating speed of the rotor 12 is generated from the element.
Inventors:
OOHASHI TOSHIHARU
Application Number:
JP24948283A
Publication Date:
July 18, 1985
Filing Date:
December 23, 1983
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G01P3/487; H02K11/00; H02K23/66; H02P7/06; (IPC1-7): H02P5/06
Attorney, Agent or Firm:
Miyai Akio