INSULATION INSPECTION DEVICE FOR MOTORS AND INSULATION INSPECTION METHOD FOR MOTORS
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.
-
Citations
31 Claims
-
1-11. -11. (canceled)
-
12. An insulation inspection device for motors comprising:
-
an inverter for driving a motor; a partial discharge detecting unit for detecting partial discharge in the motor and determining soundness of the motor; and a control circuit for controlling the inverter, wherein the control circuit 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 driving voltage for the motor, between the motor and ground. - View Dependent Claims (13, 14, 15, 16, 17)
-
-
18. An insulation inspection device for motors comprising:
-
an inverter for driving a motor; a partial discharge detecting unit for detecting partial discharge in the motor and determining soundness of the motor; and a control circuit for controlling the inverter, wherein the control circuit further 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 driving voltage for the motor, between phases of the motor. - View Dependent Claims (19, 20, 21, 22)
-
-
23. An insulation inspection device for motors comprising:
-
an inverter for driving a motor; a partial discharge detecting unit for detecting partial discharge in the motor and determining soundness of the motor; and a control circuit for controlling the inverter, wherein the control circuit 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 driving voltage for the motor, between the phases of the motor. - View Dependent Claims (24, 25, 26, 27)
-
-
28. 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:
-
a first step of setting a value of test voltage to be applied to the motor; a second step of the control circuit adjusting 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 driving voltage for the motor; a third step of the inverter applying the test voltage between each phase and ground; and a fourth step of the partial discharge detecting unit detecting a partial discharge signal and determining soundness of the motor with respect to ground. - View Dependent Claims (29)
-
-
30. 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:
-
a first step of setting a value of test voltage to be applied to the motor; a fifth step of the control circuit adjusting 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 driving voltage for the motor; a sixth step of the inverter applying the test voltage between the phases, and a seventh step of the partial discharge detecting unit detecting a partial discharge signal and determining phase-to-phase soundness of the motor. - View Dependent Claims (31)
-
Specification