Driving apparatus and method of three phase induction motor
AssigneeLG Electronics Inc.
InventorJae-Choon Lee
Life of this patent
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Abstract
A driving apparatus of a three-phase induction motor includes: a three-phase power supply unit for supplying three-phase power; a rectifier for rectifying the three phase voltage supplied from the three phase power supply unit; a voltage reducing unit for reducing a DC voltage generated from the rectifier and outputting a stabilized DC voltage; and an inverter unit for varying the DC voltage outputted from the voltage reducing unit to a three-phase AC voltage and driving a three-phase induction motor. A power-factor degradation generated during supplying a DC voltage to the inverter to drive the three-phase induction motor is prevented, a harmonic wave is removed, and because a high-priced inverter component is not necessary, its relevant expense is reduced.
Claims15
A driving apparatus for a three-phase induction motor comprising:
- a three-phase power supply that supplies three-phase voltage;
- a rectifier that rectifies the three phase voltage supplied from the three phase power supply;
- a voltage reducer that reduces a DC voltage generated by the rectifier and outputs a stabilized DC voltage;
- and
- an inverter that varies the DC voltage output from the voltage reducer to a three-phase AC voltage and that drives the three-phase induction motor,
- said voltage reducer comprising:
- an integrated circuit that measures the DC voltage generated by the rectifier and that outputs a control signal to control the DC voltage output from the rectifier to the inverter;
- a gate driver that generates a drive signal to drive the inverter according to the control signal output from the integrated circuit;
- a DC stabilizer that reduces the DC voltage generated from the rectifier according to the drive signal of the gate driver, and that generates a stabilized DC voltage;
- and
- a DC link that links the DC voltage generated from the DC stabilizer to a load supplier that supplies the DC voltage applied to the DC link to the inverter.
A method for driving a three-phase induction motor comprising:
- rectifying a three-phase voltage;
- measuring a magnitude of the rectified voltage;
- generating a control signal based on the magnitude of the rectified voltage
- generating a drive signal based on the control signal;
- reducing the rectified signal according to the drive signal with a DC stabilizer;
- generating a stabilized DC voltage based on the rectified signal;
- generating a three-phase AC voltage based on the stabilized DC voltage;
- and
- driving a three-phase induction motor with the three-phase AC voltage.
Dependencies are inferred from the claim text.