Insulation inspection device for motors and insulation inspection method for motors
First Claim
1. An insulation inspection device for motors comprising:
- an inverter that drives a motor;
a partial discharge detector that detects partial discharge in the motor and determines soundness of the motor; and
a control circuit that controls the inverter to adjust a switching interval of a voltage pulse so as to be equal to or smaller than a pulse round-trip propagation time between the inverter and the motor, thereby generating surge voltage equal to or lower than three times and equal to or higher than two times a normal driving voltage for the motor, between the motor and ground.
1 Assignment
0 Petitions
Accused Products
Abstract
An insulation inspection device for motors includes an inverter for driving a motor, a partial discharge detecting unit for determining soundness of the motor, and a control circuit for controlling the inverter. The control circuit adjusts a switching interval of a voltage pulse of the inverter so as to be equal to a pulse round-trip propagation time between the inverter and the motor, thereby generating surge voltage higher than driving voltage for the motor, between the motor and ground, and adjusts a switching time for each phase of the inverter, thereby generating surge voltage higher than driving voltage for the motor, between phases, thus performing insulation inspection.
8 Citations
20 Claims
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1. An insulation inspection device for motors comprising:
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an inverter that drives a motor; a partial discharge detector that detects partial discharge in the motor and determines soundness of the motor; and a control circuit that controls the inverter to adjust a switching interval of a voltage pulse so as to be equal to or smaller than a pulse round-trip propagation time between the inverter and the motor, thereby generating surge voltage equal to or lower than three times and equal to or higher than two times a normal driving voltage for the motor, between the motor and ground. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An insulation inspection device for motors comprising:
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an inverter for driving a motor; a partial discharge detector that detects partial discharge in the motor and determines soundness of the motor; and a control circuit that controls the inverter and adjusts a switching time for each phase of the inverter so that the switching times are simultaneous or shifted from each other, thereby generating surge voltage equal to or lower than three times and equal to or higher than two times a normal driving voltage for the motor, between phases of the motor. - View Dependent Claims (8, 9, 10, 11)
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12. An insulation inspection device for motors comprising:
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an inverter that drives a motor; a partial discharge detector that detects partial discharge in the motor and determines soundness of the motor; and a control circuit that controls the inverter and adjusts the switching interval of the voltage pulse for each phase of the inverter so as to be equal to or smaller than the pulse round-trip propagation time, and reverses positive and negative polarities of the voltage pulses between the phases, thereby generating surge voltage equal to or lower than five times and equal to or higher than two times a normal driving voltage for the motor, between the phases of the motor. - View Dependent Claims (13, 14, 15, 16)
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17. An insulation inspection method for motors, using an insulation inspection device for motors including an inverter that drives a motor, a partial discharge detector that determines soundness of the motor, and a control circuit that controls the inverter, the insulation inspection method comprising:
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setting a value of test voltage to be applied to the motor; adjusting, by the control circuit, a switching interval of a voltage pulse of the inverter so as to be equal to or smaller than a pulse round-trip propagation time between the inverter and the motor, in order to set, to the test voltage, surge voltage that is to be generated between the motor and ground and is equal to or lower than three times and equal to or higher than two times a normal driving voltage for the motor; applying, by the inverter, the test voltage between each phase and ground; and detecting, by the partial discharge detector, a partial discharge signal and determining soundness of the motor with respect to ground. - View Dependent Claims (18)
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19. An insulation inspection method for motors, using an insulation inspection device for motors including an inverter for driving a motor, a partial discharge detecting unit for determining soundness of the motor, and a control circuit for controlling the inverter, the insulation inspection method comprising:
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setting a value of test voltage to be applied to the motor; adjusting, by the control circuit, a switching time for each phase of the inverter so that the switching times are simultaneous or shifted from each other in order to set, to the test voltage, surge voltage that is to be generated between phases of the motor and is equal to or lower than three times and equal to or higher than two times a normal driving voltage for the motor; applying, by the inverter, the test voltage between the phases, and detecting, by the partial discharge detecting unit, a partial discharge signal and determining phase-to-phase soundness of the motor. - View Dependent Claims (20)
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Specification