Title:
BRUSHLESS DC MOTOR
Document Type and Number:
Japanese Patent JPS6059964
Kind Code:
A
Abstract:
PURPOSE:To reduce the size of a motor by providing a frequency generator FG magnet multipolarly magnetized in the end direction at a rotor yoke, and oppositely arranging the magnet and an FG pattern through an axial air gap at a stator side. CONSTITUTION:An FG magnet 9 is provided at the rotor side of a motor and, an FG pattern 10 is provided through an axial air gap 12 at the stator side of the motor. the magnet 9 is multipolarly magnetized in the end direction. The pattern 10 is composed at the conductor connection 10a at the same pole pitch P as the magnet 9, a voltage is induced by the relative rotation to the magnet 9 at every conductor, a frequency output voltage V proportional to the rotating speed applied in phase is produced from the output terminal of the pattern 10, and the output voltage is fed back as a speed signal to control the speed of a DC motor. Thus, the thickness of the axial air gap can be shortenend, thereby reducing the size of the motor.
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Inventors:
TAKABA YOUSUKE
Application Number:
JP16667383A
Publication Date:
April 06, 1985
Filing Date:
September 12, 1983
Export Citation:
Assignee:
TAMAGAWA SEIKI CO LTD
International Classes:
H02K29/14; (IPC1-7): H02K29/14
Domestic Patent References:
| JP52155917B |
Attorney, Agent or Firm:
Soga Doteru
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