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Patent Searching and Data


Title:
CONTROLLER FOR COMMUTATORLESS MOTOR
Document Type and Number:
Japanese Patent JPH0622585
Kind Code:
A
Abstract:

PURPOSE: To arbitrarily control an applied voltage of a commutatorless motor by dropping the voltage until a detected current value is, if the current value exceeds an upper limit value of a current control zone, returned to the control zone, and raising it if it becomes less than a lower limit value.

CONSTITUTION: A commutatorless motor 4 has a rotor position detector 9, which detects a voltage to be applied and calculates a speed. Then, a microprocessor 7 generates a PWM signal based on the speed, outputs it to a chopping circuit 6, and controls a driving circuit 5 to drive switching elements of a switching circuit 3. A current flowing to a power source circuit of the motor 4 is detected by a current detecting sensor 8, input to the microprocessor 7, which so control the circuit 6 as to return a current value converted from an analog signal to a digital value to a current control zone if the current value is out of the preset control zone to regulate and maintain the voltage to be applied from the circuit 3 to the motor 4.


Inventors:
SHINOZAKI YOSHITERU
Application Number:
JP1992000179660
Publication Date:
January 28, 1994
Filing Date:
July 07, 1992
Export Citation:
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Assignee:
FUJITSU GENERAL LTD
International Classes:
H02P6/08; (IPC1-7): H02P6/02
Domestic Patent References:
JPS62272851A1987-11-27