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Motor insulation deterioration detection device

A technology of insulation aging and detection device, which is applied in the direction of motor generator testing, measuring device, measuring electricity, etc., and can solve the problems of device structure redundancy and so on.

Active Publication Date: 2010-07-07
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in a motor drive device capable of simultaneously driving a plurality of motors, it is necessary to provide such a measurement circuit for each motor to be measured, and there is a problem that the structure of the device is redundant.

Method used

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  • Motor insulation deterioration detection device
  • Motor insulation deterioration detection device
  • Motor insulation deterioration detection device

Examples

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Embodiment Construction

[0011] figure 1 An example of the configuration of a motor drive device having an insulation degradation detection function according to an embodiment of the present invention is shown.

[0012] exist figure 1 Although the example of the motor drive apparatus 14 which drives two motors 10 and 12 is shown in , of course, the number of motors is not limited to this. The motor drive device 14 is composed of an inverter unit 18 and a plurality (two) of inverter units 24 and 26 . The inverter unit 18 has a rectifier 16 and rectifies the three-phase AC power supply 17 to DC. The inverter units 24 and 26 respectively have smoothing capacitors 20 and 21 and inverter circuits 22 and 23, and filter the direct current from the inverter unit 18, convert it into three-phase alternating current with variable frequency, and drive the two motors 10 respectively. , 12.

[0013] Since the smoothing capacitors 20 and 21 provided in the inverter units 24 and 26 are connected in parallel, they...

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PUM

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Abstract

Disclosed is an insulation deterioration detection device that can accurately detect insulation deterioration in multiple motors by a simple circuit configuration. When detecting insulation deterioration, one end A of a smoothing capacitor is connected via a first switch to ground, and the other end B is connected via a second switch to motor windings; in this condition, link voltage is measured by a voltage measuring circuit provided in a converter unit, and the measured link voltage value is transmitted to a microcomputer in each inverter unit via serial communication. Current flowing via motor insulation resistance Z1, Z2 is measured by a current measuring circuit provided in each inverter unit, and the microcomputer calculates the value of the insulation resistance Z1, Z2 from the link voltage value and the current value.

Description

technical field [0001] The present invention relates to a device capable of detecting insulation aging of a plurality of motors connected to a motor drive device capable of driving a plurality of motors. Background technique [0002] In JP2006-226993A, a device is described, which is used to detect the insulation aging of the coil of the motor connected to the motor drive device. The motor drive device uses rectified 3-phase AC power and filters it through a filter capacitor to become A power supply unit for a DC power supply and a motor drive amplifier that converts the DC power supply into a frequency-variable AC power supply to drive a motor. In this device, when the three-phase AC power supply is cut off, the electric charge remaining in the smoothing capacitor for a certain period of time after the cut-off is used to detect insulation degradation. That is, when detecting insulation degradation, cut off the 3-phase AC power supply while grounding one end of the filter c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R27/08
CPCG01R31/1263G01R31/343G01R31/346
Inventor 堀越真一佐藤博裕平井朗
Owner FANUC LTD
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