Electric motor control apparatus
First Claim
1. An electric motor control apparatus, comprising:
- 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, the short-circuit point locating means testing a first subset of the plurality of switching elements if an average motor voltage exceeds a threshold, and tests a second subset of the plurality of switching elements if the average motor voltage does not exceed the threshold.
1 Assignment
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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.
36 Citations
6 Claims
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1. 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, the short-circuit point locating means testing a first subset of the plurality of switching elements if an average motor voltage exceeds a threshold, and tests a second subset of the plurality of switching elements if the average motor voltage does not exceed the threshold. - View Dependent Claims (2)
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3. 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, the rotation angle detection value, and a rotational angular velocity obtained by differentiating the rotation angle detection value, and the short-circuit point locating means only testing the switching elements when an absolute value of the rotation angular velocity is less than a threshold value or when the rotation angle detection value is within a predetermined angle range. - View Dependent Claims (4)
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5. 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, the short-circuit point locating means testing a first subset of the plurality of switching elements if an average motor voltage exceeds a threshold, and tests a second subset of the plurality of switching elements if the average motor voltage does not exceed the threshold. - View Dependent Claims (6)
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Specification