Title:
DRIVE CIRCUIT FOR STEPPING MOTOR
Document Type and Number:
Japanese Patent JPS60216793
Kind Code:
A
Abstract:
PURPOSE:To perform stable normal rotation of a stepping motor with less noise even in the vicinity of a resonance of a low speed range by controlling a reference value of a PWM controller on the basis of the frequency of a clock signal. CONSTITUTION:A correction controller 13 for controlling a reference value of a reference voltage setter 9 of a PWM controller 7 on the basis of a frequency of a clock signal Vc from a clock circuit 5 is provided to limit a motor current when the frequency of a clock signal decreases. Thus, the torque does not become larger more than required or strong resonance does not occur at a resonance point of a low speed range of a stepping motor, noise is always low, and stable normal rotation can be obtained.
Inventors:
KONI HIROAKI
Application Number:
JP7122084A
Publication Date:
October 30, 1985
Filing Date:
April 10, 1984
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
H02P8/12; H02P8/32; (IPC1-7): H02P8/00
Attorney, Agent or Firm:
Ishida Choshichi