Inverter controller for driving motor and air conditioner using inverter controller
First Claim
1. An inverter controller for driving a motor, comprising:
- an AC power supply for supplying an AC power;
a rectifier formed of a diode bridge for rectifying the AC power to be converted to DC power;
a reactor having a predetermined small capacity which is connected to the rectifier, for improving a power factor of the AC power supply;
an inverter which converts the DC power to AC power for driving the motor;
a capacitor having a predetermined small capacity which is connected between DC bus lines of the inverter to absorb regeneration energy from the motor;
a motor voltage command generator which generates a motor voltage command value of the motor, based on a speed command value of the motor applied from the outside;
a PN voltage detector which detects a DC voltage value of the inverter;
a PN voltage corrector which calculates a ratio of the DC voltage detection value of the inverter obtained by the PN voltage detector to a predetermined DC voltage reference value of the inverter to thereby generate a PN voltage correction factor; and
a motor voltage command corrector which generates a motor voltage command correction value of the motor.
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Accused Products
Abstract
A reactor (11) having a predetermined small capacity is connected to a rectifier (2), and a capacitor (12) having a predetermined small capacity is connected between DC bus lines of the inverter (3), so that a small, light and low-cost inverter controller for driving a motor can be implemented, and even when an inverter DC voltage largely fluctuates and it is difficult to drive the motor, the motor can be kept driving by operating the inverter such that a voltage applied to the motor may stay constant by a motor voltage command corrector (17) which generates a motor voltage command correction value of the motor.
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Citations
10 Claims
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1. An inverter controller for driving a motor, comprising:
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an AC power supply for supplying an AC power;
a rectifier formed of a diode bridge for rectifying the AC power to be converted to DC power;
a reactor having a predetermined small capacity which is connected to the rectifier, for improving a power factor of the AC power supply;
an inverter which converts the DC power to AC power for driving the motor;
a capacitor having a predetermined small capacity which is connected between DC bus lines of the inverter to absorb regeneration energy from the motor;
a motor voltage command generator which generates a motor voltage command value of the motor, based on a speed command value of the motor applied from the outside;
a PN voltage detector which detects a DC voltage value of the inverter;
a PN voltage corrector which calculates a ratio of the DC voltage detection value of the inverter obtained by the PN voltage detector to a predetermined DC voltage reference value of the inverter to thereby generate a PN voltage correction factor; and
a motor voltage command corrector which generates a motor voltage command correction value of the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An air conditioner which includes a converter apparatus for converting AC power to DC power and an inverter apparatus for converting the DC power converted by the converter to AC power of a variable voltage and a variable frequency and supplying the AC power to a motor for driving a compressor,
wherein the inverter apparatus, comprises: -
an AC power supply for supplying an AC power;
a rectifier formed of a diode bridge for converting the AC power to DC power;
a reactor having a predetermined small capacity which is connected to the rectifier, for improving a power factor of the AC power supply;
an inverter which converts the DC power to AC power for driving the motor;
a capacitor having a predetermined small capacity which is connected between DC bus lines of the inverter to absorb regeneration energy from the motor;
a motor voltage command generator which generates a motor voltage command value of the motor, based on a speed command value of the motor applied from the outside;
a PN voltage detector which detects a DC voltage value of the inverter;
a PN voltage corrector which calculates a ratio of the DC voltage detection value of the inverter obtained by the PN voltage detector to a predetermined DC voltage reference value of the inverter to thereby generate a PN voltage correction factor; and
a motor voltage command corrector which generates a motor voltage command correction value of the motor.
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Specification