MOTOR DRIVE CIRCUIT AND MOTOR DRIVE SYSTEM

• Main Author: OGUSHI TOSHIAKI
• Format: Patent
• Language: English
• Published: 03.02.2014
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a motor drive circuit in which controllability of the number of rotation of a motor can be improved.SOLUTION: The motor drive circuit includes a first conversion circuit which outputs analog voltage proportional to the number of rotation of the motor. The motor drive circuit has a differential voltage calculation circuit which calculates differential voltage between the analog voltage and a rotation instruction voltage which specifies the number of rotation of the motor and outputs a differential voltage signal including information on the differential voltage. The motor drive circuit includes a duty control circuit which outputs a duty control signal including information on control duty for controlling the duty of a PWM signal so that the differential voltage between the rotation instruction voltage and the analog voltage may be close to zero, on the basis of the differential voltage signal. The motor drive circuit includes a motor drive waveform control circuit for generating and outputting the PWM signal, according to the signal on the basis of the duty control signal.