On-line monitoring method for end insulation state of inverter driving motor

A technology for end insulation and driving motors, which is applied in the direction of motor generator testing, instruments, and electrical measurement. It can solve the problems that the insulation state does not change much, and the insulation state and monitoring of the end of the motor winding cannot be realized.

Active Publication Date: 2021-09-14
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The overvoltage is distributed non-linearly and non-uniformly throughout the winding, and the first turn of the winding near the end of the phase bears greater voltage stress than other parts, which makes the insulation at the end of the motor more prone to deterioration
Existing methods u

Method used

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  • On-line monitoring method for end insulation state of inverter driving motor
  • On-line monitoring method for end insulation state of inverter driving motor
  • On-line monitoring method for end insulation state of inverter driving motor

Examples

Experimental program
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Embodiment

[0038] The present invention relates to an online monitoring method for the end insulation state of an inverter-driven motor. In this embodiment, a method such as figure 1The experimental bench shown. The motor under test in the experiment is an 8-pole 380V, 3kW permanent magnet synchronous motor (PMSM). The load motor adopts a 380V, 3kW induction motor (IM). Two frequency converters control the permanent magnet synchronous motor and the induction motor in speed mode and torque mode respectively. A high-speed signal acquisition unit (Pico 5444D, 14 bits, 125MS / s) and a host computer are used for signal acquisition and processing. Use a high-frequency differential probe CYBERTEK DP6150A (100MHz bandwidth) to measure the motor terminal voltage. A high-frequency current probe CYBERTEK CP8030B with a bandwidth of 50MHz is used to measure the motor current. Three current probes are arranged at the three-phase ends of the motor to collect the current signals including high-frequ...

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Abstract

The invention relates to an on-line monitoring method for the end insulation state of an inverter driving motor, and the method comprises the steps: 1) collecting current signals on three-phase phase lines of the motor, and intercepting a switch high-frequency oscillation current segment; 2) decomposing the intercepted switch high-frequency oscillation current segment into three sub-modes by using a variational mode decomposition algorithm, obtaining a high-frequency common-mode current and a center frequency thereof, and taking the center frequency of the high-frequency common-mode current as an extracted frequency feature; 3) calculating the total variation of the three-phase insulation capacitance by using the center frequency of the high-frequency common-mode current; and 4) obtaining the amplitude variation of the three-phase high-frequency common-mode current at the resonance point as an extracted amplitude feature, and carrying out fault phase positioning by using the amplitude feature. Compared with the prior art, the method has the advantages of high sensitivity, high robustness, high safety and the like.

Description

technical field [0001] The invention relates to the field of on-line monitoring of motor insulation, in particular to an on-line monitoring method for the end insulation state of an inverter-driven motor. Background technique [0002] The inverter-driven motor using pulse width modulation technology has the advantages of easy start, high efficiency and good speed regulation, and is widely used in new energy vehicles, wind power generation, ship propulsion and other industrial fields, and its reliability is the basis for the economical and safe operation of the system. The essential. Motor failures can lead to unplanned downtime, financial loss, and even catastrophic failure. Industry investigations have shown that main insulation failures are an important cause of motor failures. Main insulation faults account for more than 30% of all motor faults. For variable frequency speed regulating motors, the high dv / dt generated by the inverter output will exert excessive electric...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/34
CPCG01R31/1227G01R31/34
Inventor 李豪顾奕向大为刘博文
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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