MOTOR DRIVING CIRCUIT, COOLER AND ELECTRONIC EQUIPMENT USING THE SAME, AND METHOD OF ESTIMATING RESISTANCE VALUE AND INDUCTANCE VALUE OF MOTOR

摘要

PROBLEM TO BE SOLVED: To accurately estimate a counterelectromotive force by measuring the resistance and inductance of a motor.

SOLUTION: A test signal generating circuit 60 generates an AC test signal STEST. A drive 10 supplies a motor 6 with a drive voltage VDRVwith the test signal STESTsuperimposed thereon. A current detecting circuit 12 generates a detection signal SCSaccording to a current flowing actually to the coil of the motor 6. A filter 64 extracts frequency components according to the test signal STESTfrom the detection signal SCS. A coil constant calculating circuit 66 calculates the resistance value R and the inductance value L of the motor 6, based on the amplitudes of the detection signal SCS' output from the filter 64 and the test signal STESTand the phase difference between them.

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