MOTOR DRIVING APPARATUS
First Claim
1. A motor driving apparatus comprising:
- at least one motor driving unit comprising an inverter coupled between a positive direct current bus line and a negative direct current bus line of a direct current power source, the inverter being configured to convert direct current power into alternating current power to drive an alternating current motor;
a low-voltage source coupled between a ground and at least one of the positive direct current bus line and the negative direct current bus line;
a current detecting element configured to detect a closed circuit current flowing through a closed circuit of the low-voltage source, the alternating current motor, and a part of the inverter; and
an insulation resistance degradation determinator configured to make a comparison between the closed circuit current detected by the current detecting element and a predetermined threshold, and configured to determine, based on the comparison, whether an insulation resistance of the alternating current motor is degraded.
1 Assignment
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Accused Products
Abstract
A motor driving apparatus includes a motor driving unit, a low-voltage source, a current detecting element, and an insulation resistance degradation determinator. The motor driving unit includes an inverter coupled between a positive DC bus line and a negative DC bus line of a DC power source. The inverter converts DC power into AC power to drive an AC motor. The low-voltage source is coupled between a ground and at least one of the positive DC bus line and the negative DC bus line. The current detecting element detects a closed circuit current flowing through a closed circuit of the low-voltage source, the AC motor, and a part of the inverter. The insulation resistance degradation determinator makes a comparison between the closed circuit current and a predetermined threshold, and configured to determine, based on the comparison, whether an insulation resistance of the AC motor is degraded.
9 Citations
20 Claims
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1. A motor driving apparatus comprising:
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at least one motor driving unit comprising an inverter coupled between a positive direct current bus line and a negative direct current bus line of a direct current power source, the inverter being configured to convert direct current power into alternating current power to drive an alternating current motor; a low-voltage source coupled between a ground and at least one of the positive direct current bus line and the negative direct current bus line; a current detecting element configured to detect a closed circuit current flowing through a closed circuit of the low-voltage source, the alternating current motor, and a part of the inverter; and an insulation resistance degradation determinator configured to make a comparison between the closed circuit current detected by the current detecting element and a predetermined threshold, and configured to determine, based on the comparison, whether an insulation resistance of the alternating current motor is degraded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification