Cause Analysis and Improvement of Metro Vehicle Linear Motor Burnout and Wedge Sinking Faults

Targeting the frequent occurrence of motor burnout and wedge sinking faults in Guangzhou Metro Line 5 train motor, with disassemblies and field tests, the main cause of linear motor fault is concluded to be motor overheating. Through temperature rising experiment, it is found that with problems in inverter control software, motor temperature rises drastically, which impacts the motor operational performance. Field test results show that after the upgrade and revision of relevant software, the motor overheating problem and related fault condition are effectively resolved and the motor life span is extended.