Thanks for reply.All the messages including pictures now are passed to motor supplier for inspection.Please do us a favour to give us more informations as requested by motor supplier: 1. to measure the “ohm value” on lines 1+2, line 2+3 and line 1+3 separately; 2. to measure the insulation resistance on motor coil and motor housing separately by “high resistance meter” ? 3. to measure the revoltuins per minute. Hoping to have your help to collect above informations soon.