On-line Inter-turn Short Circuit Fault Diagnosis of Integrated Motor Drive System Based on Analysis of End-leakage-flux
The inverter based on wide bandage devices has the advantage of high power density and high operating temperature,which can be placed between the motor end cap and end winding by miniaturization and slim design to form an integrated motor drive system with compact structure.When an inter-turn short circuit fault occurs in the integrated motor drive system,the increase in short circuit winding current not only causes the increase of the motor temperature that leads to a reduction of insulation,but also leads to changes in the magnetic field which further affects the operation of the inverter.A 1.5 kW AC induction motor was used as an example to build a three-dimensional physical model of an integrated motor drive system based on wide-bandage devices,and the end-leakage-flux before and after an inter-turn short circuit fault was analyzed and calculated by mathematical analysis,and then extracted the mag-netic flux density ellipse eccentricity in the x-y coordinate system of two points on the surface of the PCB at the equal distance from the center of the axis and at the difference of the mechanical angle of 45 ° to reflect the symmetry of the end-leakage-flux field,which was used as characteristic indicator to diagnose whether the motor has an inter-turn short circuit fault.The simulation and experiment results verified the correctness and effectiveness of the proposed technique.
integrated motor drive systeminter-turn short circuit faultend-leakage-fluxfinite element analysis
万方数据
维普
