ELECTRIC MOTOR CONTROL APPARATUS
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Accused Products
Abstract
An electric motor control apparatus that can quickly and accurately locate a short-circuit fault point. The electric motor control apparatus includes: a current controller determining respective phase voltage commands according to currents flowing in respective phases of an electric motor and a torque current command; a switching element drive circuit instructing, based on the respective phase voltage commands, an inverter to perform a switching operation; the inverter receiving a switching operation signal to drive the electric motor; current detectors disposed in series with the switching elements in the respective phases of the inverter; and a short-circuit point locating mechanism storing a test pattern indicative of a predetermined combination for turning on the switching elements of the inverter, and locating a short-circuit fault point based on the test pattern and current detection values in the respective phases detected by the current detectors in response to the test pattern.
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Citations
13 Claims
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1-7. -7. (canceled)
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8. An electric motor control apparatus, comprising:
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an inverter which comprises a plurality of switching elements, and drives an electric motor by operating the plurality of switching elements; a current detector disposed in the inverter; short-circuit point locating means for locating a short-circuit fault point; and motor rotation angle detecting means for detecting a rotation angle of the electric motor, and outputting a rotation angle detection value, wherein the short-circuit point locating means stores a test pattern indicative of a combination for turning on the switching elements, and locates the short-circuit fault point based on the test pattern, a current detection value detected by the current detector in response to the test pattern, and the rotation angle detection value. - View Dependent Claims (9)
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10. An electric motor control apparatus, comprising:
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an inverter which comprises a plurality of switching elements, and drives an electric motor by operating the plurality of switching elements; a current detector disposed in the inverter; short-circuit point locating means for locating a short-circuit fault point; and motor rotation angle detecting means for detecting a rotation angle of the electric motor, and outputting a rotation angle detection value, wherein the short-circuit point locating means stores a test pattern indicative of a combination for turning on the switching elements, and locates the short-circuit fault point based on the test pattern, a current detection value detected by the current detector in response to the test pattern, and a rotational angular velocity obtained by differentiating the rotation angle detection value. - View Dependent Claims (11)
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12. An electric motor control apparatus, comprising:
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an inverter which comprises a plurality of switching elements, and drives an electric motor by operating the plurality of switching elements; a current detector disposed in the inverter; short-circuit point locating means for locating a short-circuit fault point; and terminal voltage detecting means for detecting a terminal voltage of the electric motor, wherein the short-circuit point locating means stores a test pattern indicative of a combination for turning on the switching elements, selects a test pattern to be carried out according to a result of comparison between a detection value of the terminal voltage detecting means and a predetermined threshold, and locates the short-circuit fault point based on the test pattern and a current detection value detected by the current detector in response to the test pattern. - View Dependent Claims (13)
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Specification