Driving systems of AC motor
First Claim
1. An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
- a ripple current generator for supplying a ripple current to said AC motor; and
a magnetic pole position estimator, wherein said magnetic pole position estimator observes at least two current values of said ripple current for both positive and negative sides of said ripple current to estimate the magnetic pole position of said AC motor.
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Accused Products
Abstract
An AC motor control apparatus that is applicable to commonly used PM motors and capable of detecting the magnetic pole position with simple algorithm. The AC motor control apparatus comprises an inverter for applying arbitrary AC power to an AC motor and a controller for sending a control signal to the inverter. The controller comprises a ripple current generator for supplying a ripple current to the AC motor and a magnetic pole position estimator. The magnetic pole position estimator observes at least two current values of the ripple current for both positive and negative sides of the ripple current to estimate the magnetic pole position of the AC motor.
17 Citations
20 Claims
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1. An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
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a ripple current generator for supplying a ripple current to said AC motor; and
a magnetic pole position estimator, wherein said magnetic pole position estimator observes at least two current values of said ripple current for both positive and negative sides of said ripple current to estimate the magnetic pole position of said AC motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14)
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10. An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
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a ripple current generator for supplying a ripple current to said AC motor; and
a magnetic pole position estimator, wherein said ripple current generator supplies rectangular waveform voltages with different amplitudes in sequence as a voltage command and said magnetic pole position estimator observes at least one current value of said ripple current for both positive and negative sides of said ripple current to estimate the magnetic pole position of said AC motor. - View Dependent Claims (11, 12, 13, 15, 16, 17, 18, 19)
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20. An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
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a ripple current generator for supplying a ripple current to said AC motor; and
a magnetic pole position estimator, wherein said ripple current generator applies a stepwise waveform voltage as the voltage command or applies rectangular waveform voltages with different amplitudes in sequence as a voltage command and said magnetic pole position estimator estimates the magnetic pole position of said AC motor.
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Specification