Driving apparatus and method of three phase induction motor
First Claim
1. 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.
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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.
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Citations
15 Claims
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1. A driving apparatus for a three-phase induction motor comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for driving a three-phase induction motor comprising:
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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. - View Dependent Claims (13, 14, 15)
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Specification