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Patent Searching and Data


Title:
MOTOR CONTROLLER
Document Type and Number:
Japanese Patent JPH07241096
Kind Code:
A
Abstract:

PURPOSE: To provide a motor controller in which reliability in the operation is enhanced by preventing undue heating of a switching element for driving a motor.

CONSTITUTION: A current sensor 4 detects a current flowing through a motor 1 and when the detected current exceeds an overcurrent level, an overcurrent detection circuit 6 outputs a signal S1 of 'L' level. A circuit 14 measures the period of 'L' level signal S. being outputted from the overcurrent detection circuit 6. When the measured period 15 shorter than a predetermined value, an 'L' level signal S2 is outputted and a PWM control signal for transistors TR3, TR4 is delivered from the output terminals P3, P4 of a microcomputor 7 through AND circuits 12, 13.


Inventors:
SAIJIMA ATSUO
Application Number:
JP3034694A
Publication Date:
September 12, 1995
Filing Date:
February 28, 1994
Export Citation:
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Assignee:
UNISIA JECS CORP
International Classes:
B62D5/065; B62D5/07; H02H7/08; B62D5/04; H02P7/00; H02P7/29; H02P7/291; (IPC1-7): H02P7/29; B62D5/04; H02H7/08
Attorney, Agent or Firm:
阿部 和夫