Title:
BRUSHLESS MOTOR
Document Type and Number:
Japanese Patent JPS61191253
Kind Code:
A
Abstract:
PURPOSE:To reduce torque ripple, by providing a driving coil and a current detecting coil in series, and by arranging the detecting coil near a position detecting element. CONSTITUTION:Coil current ic flows through a detecting coil 10, and according to the current, magnetic flux is generated on the detecting coil 10. Magnetic flux from a rotor magnet and magnetic flux generated on the detecting coil 10 are detected by a position detecting element 1, and the detected voltage Vp is applied to comparators 6, 7. Accordingly, voltage exactly in proportion to current Ic namely torque is included in the detected voltage Vp, and essential current feedback is to be provided. As the result, torque ripple can be reduced.
Inventors:
WACHI SHIGEAKI
Application Number:
JP3132685A
Publication Date:
August 25, 1986
Filing Date:
February 19, 1985
Export Citation:
Assignee:
SONY CORP
International Classes:
H02K29/00; H02P6/10; (IPC1-7): H02K29/00
Attorney, Agent or Firm:
Tsuchiya Masaru