Motor controller
First Claim
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1. A motor control apparatus comprising:
- an AC motor, a power conversion device for adding a voltage to said AC motor according to a pulse width modulation signal generated by comparing an order value with a carrier wave, a control device for controlling said order value by detecting a position of a rotator of said AC motor based on a differential between an actual current differential vector and a reference current differential vector, and a current sensor abnormality detector for outputting a current sensor abnormality signal value by judging whether a sum of said respective electric current differential values calculated by detecting an electric current from each phase of said AC motor and by detecting an electric current differential value, is more than a predetermined value or not.
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Abstract
In order to propose an inexpensive and highly precise motor controller, it is structured so as to detect the position of the rotor on the basis of the difference between the real current differential vector and the reference current differential vector, thereby control the motor without using a rotation position sensor.
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Citations
5 Claims
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1. A motor control apparatus comprising:
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an AC motor, a power conversion device for adding a voltage to said AC motor according to a pulse width modulation signal generated by comparing an order value with a carrier wave, a control device for controlling said order value by detecting a position of a rotator of said AC motor based on a differential between an actual current differential vector and a reference current differential vector, and a current sensor abnormality detector for outputting a current sensor abnormality signal value by judging whether a sum of said respective electric current differential values calculated by detecting an electric current from each phase of said AC motor and by detecting an electric current differential value, is more than a predetermined value or not.
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2. A motor control apparatus comprising:
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an AC motor, a power conversion device for adding a voltage to said AC motor according to a pulse width modulation signal generated by comparing an order value with a carrier wave, a current sensor abnormality detector for outputting a current sensor abnormality signal value by judging whether a sum of said respective electric current differential values calculated by detecting an electric current from each phase of said AC motor and by detecting an electric current differential value, is more than a predetermined value or not, a first phase current detection part for detecting respective said electric current differential values which change according to each voltage vector added by plural interval, a standard phase current difference operation part for operating a standard phase current difference obtained by difference of plural said voltage vectors, and a position detection part for detecting a rotator position of said AC motor using said electric current difference and said standard phase current difference, said motor control apparatus characterized by further comprising;
a control device for controlling said voltage order value by detecting said rotator position of said AC motor and for controlling said AC motor including said current sensor abnormally signal value. - View Dependent Claims (3, 4, 5)
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Specification