Power conversion device

• Main Authors: KAZUHISA MORI, NAOTO OHNUMA, KIYOHARU HIRUTA, YOUHEI MATSUMOTO, KANAKO KATOH
• Format: Patent
• Language: English
• Published: 22.07.2015
• 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

In a high-rotating speed and high-frequency inverter of a motor, a current strain resulted from an ineffective time can be inhabited through a simple structure, and a torque pulse of and noises of the motor can be reduced. The power conversion device is provided with the inverter driving the motor, a rotary encoder detecting a rotating speed and a magnetic pole position of the motor, a current detector detecting an output current of the inverter, a noise filter removing noises off an output of the current detector detecting the output current of the inverter, and a control operation part which calculate a current instruction of a torque shaft and a current instruction of a flux shaft according to a phase of the magnetic pole position of the motor and calculates a three-phase current instruction value according to the current instructions. The current conversion device calculates a phase difference between a three-phase current instruction value and an actual output current of the inverter according to the rotating speed of the motor and a delay time generated because of the current detector and the noise filter, and adds the phase difference to the phase of the magnetic pole position of the motor.