Power converting apparatus for motor driving
First Claim
1. A power converting apparatus for motor driving comprising:
- a first power converting unit that is connected to an AC power supply and converts an AC voltage from the AC power supply into a DC voltage;
a second power converting unit that is connected to the first power converting unit and converts the DC voltage into the AC voltage and outputs the AC voltage to an AC motor;
a first control unit that controls the first power converting unit; and
a second control unit that controls the second power converting unit, whereinthe second control unit includes;
a current-command generating unit that generates, based on at least a torque command, a current command for the AC motor;
a voltage-amplitude-index calculating unit that calculates, based on the current command, a voltage amplitude index that should be applied to the AC motor;
a current-command adjusting unit that generates, based on at least the voltage amplitude index and a frequency of the AC motor, a current command adjustment amount for adjusting the current command; and
a pulsation-suppression-signal generating unit that generates, based on the DC voltage, a pulsation suppression signal, andthe second control unit generates, based on a control signal including the current command adjusted by the current command adjustment amount and the pulsation suppression signal, a PWM signal to the second power converting unit and outputs the PWM signal.
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Accused Products
Abstract
A second control unit includes a current-command generating unit that generates, based on a torque command T*, a current command of the motor, a voltage-amplitude-index calculating unit that calculates, based on the current command, a voltage amplitude index (a modulation ratio PMF), a current-command adjusting unit that generates, based on the modulation ratio PMF and a frequency FINV of the motor, a current command adjustment amount dV, and a voltage command/PWM signal generating unit including a pulsation-suppression-signal generating unit that generates, based on a DC voltage EFC, a pulsation suppression signal for suppressing a pulsation component of a power supply 2f component to generate a gate signal (a PWM signal) to an inverter.
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Citations
20 Claims
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1. A power converting apparatus for motor driving comprising:
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a first power converting unit that is connected to an AC power supply and converts an AC voltage from the AC power supply into a DC voltage; a second power converting unit that is connected to the first power converting unit and converts the DC voltage into the AC voltage and outputs the AC voltage to an AC motor; a first control unit that controls the first power converting unit; and a second control unit that controls the second power converting unit, wherein the second control unit includes; a current-command generating unit that generates, based on at least a torque command, a current command for the AC motor; a voltage-amplitude-index calculating unit that calculates, based on the current command, a voltage amplitude index that should be applied to the AC motor; a current-command adjusting unit that generates, based on at least the voltage amplitude index and a frequency of the AC motor, a current command adjustment amount for adjusting the current command; and a pulsation-suppression-signal generating unit that generates, based on the DC voltage, a pulsation suppression signal, and the second control unit generates, based on a control signal including the current command adjusted by the current command adjustment amount and the pulsation suppression signal, a PWM signal to the second power converting unit and outputs the PWM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A power converting apparatus for motor driving comprising:
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a first power converting unit that is connected to an AC power supply and converts an AC voltage from the AC power supply into a DC voltage; a second power converting unit that is connected to the first power converting unit and converts the DC voltage into the AC voltage and outputs the AC voltage to an AC motor; a first control unit that controls the first power converting unit; and a second control unit that controls the second power converting unit, wherein the second control unit includes; a current-command generating unit that generates, based on at least a torque command, a current command for the AC motor; and a voltage-amplitude-index calculating unit that calculates, based on the current command, a voltage amplitude index that should be applied to the AC motor, and the first control unit includes; a DC-voltage-command generating unit that generates a DC voltage command, which is a target value of the DC voltage; and a voltage control unit that generates a control signal such that the DC voltage and the DC voltage command to coincide with each other, and the DC voltage command generated when the frequency of the AC motor is present in a predetermined range is generated to be larger than the DC voltage command generated when the frequency of the AC motor is not present in the predetermined range. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification