Driving equipment and semiconductor equipment for alternating-current motor
First Claim
1. A driving apparatus for an alternating-current motor comprising:
- an inverter using direct current as input and alternating current as output;
an alternating-current motor driven by the alternating current;
a magnetic pole position detector for generating a magnetic pole position sensing signal of the alternating-current motor;
a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period, based on the magnetic pole position sensing signal;
a quasi-sinusoidal wave modulator for generating a plurality of quasi-sinusoidal wave signals based on the plurality of trapezoidal wave signals; and
a pulse width modulator for controlling the inverter through pulse width modulation by comparing the plurality of quasi-sinusoidal wave signals with a carrier wave signal.
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Abstract
The present invention enables modulated wave signals having extremely small waveform distortion to be generated using a relatively simple circuit, and thereby it is possible to hold down vibrations and noise of a motor, which are attributable to torque ripples. In order to remove defects of the conventional techniques, the circuit generates a plurality of trapezoidal wave signals having at least two constant levels based on position sensing signals of magnetic pole of a motor, generates quasi-sinusoidal wave signals at a quasi-sinusoidal wave modulator based on the plurality of trapezoidal wave signals, and compares the quasi-sinusoidal wave signals with a carrier wave so as to perform PWM control of an inverter.
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Citations
13 Claims
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1. A driving apparatus for an alternating-current motor comprising:
- an inverter using direct current as input and alternating current as output;
an alternating-current motor driven by the alternating current;
a magnetic pole position detector for generating a magnetic pole position sensing signal of the alternating-current motor;
a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period, based on the magnetic pole position sensing signal;
a quasi-sinusoidal wave modulator for generating a plurality of quasi-sinusoidal wave signals based on the plurality of trapezoidal wave signals; and
a pulse width modulator for controlling the inverter through pulse width modulation by comparing the plurality of quasi-sinusoidal wave signals with a carrier wave signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- an inverter using direct current as input and alternating current as output;
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10. An inverter controller comprising:
- an inverter using direct current as input and alternating current as output;
a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period based on a magnetic pole position sensing signal of an alternating-current motor;
a quasi-sinusoidal wave modulator for generating a plurality of quasi-sinusoidal wave signals based on the plurality of trapezoidal wave signals; and
a pulse width modulator for controlling the inverter through pulse width modulation by comparing the plurality of quasi-sinusoidal wave signals with a carrier wave signal.
- an inverter using direct current as input and alternating current as output;
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11. A semiconductor apparatus for controlling an inverter, comprising a single chip, said single chip comprising an inverter using direct current as input and alternating current as output;
- a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period based on a magnetic pole position sensing signal of an alternating-current motor;
a quasi-sinusoidal wave modulator for generating a plurality of quasi-sinusoidal wave signals based on the plurality of trapezoidal wave signals; and
a pulse width modulator for controlling the inverter through pulse width modulation by comparing the plurality of quasi-sinusoidal wave signals with a carrier wave signal are mounted.
- a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period based on a magnetic pole position sensing signal of an alternating-current motor;
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12. A semiconductor apparatus for controlling an inverter comprising two chips,
wherein the inverter using direct current as input and alternating current as output is mounted on one chip, wherein a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period based on a magnetic pole position sensing signal of an alternating-current motor; - a quasi-sinusoidal wave modulator for generating a plurality of quasi-sinusoidal wave signals based on the plurality of trapezoidal wave signals; and
a pulse width modulator for controlling the inverter through pulse width modulation by comparing the plurality of quasi-sinusoidal wave signals with a carrier wave signal are mounted on the other chip.
- a quasi-sinusoidal wave modulator for generating a plurality of quasi-sinusoidal wave signals based on the plurality of trapezoidal wave signals; and
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13. A driving apparatus for an alternating-current motor comprising:
- an inverter using direct current as input and alternating current as output;
an alternating-current motor driven by the alternating-current;
a magnetic pole position detecting circuit for generating a magnetic pole position sensing signal of the alternating-current motor;
a trapezoidal wave modulator for generating a plurality of trapezoidal wave signals having at least two constant levels within one period, wherein the widths of the maximum and minimum levels have an electrical angle of substantially 30°
based on the position sensing signal; and
a pulse width modulator for controlling the inverter through pulse width modulation by comparing the plurality of trapezoidal wave signals with a carrier wave signal.
- an inverter using direct current as input and alternating current as output;
Specification