The brushless dc motor in the south of anhui case center: brushless dc motor stator windings of breakdown, the brushless dc motor in the south of anhui

Case: a user reflect a YP2 -280S-6/45 kw brushless dc motor stator windings of breakdown, the brushless dc motor in the south of anhui sent door-to-door service customer service center. On-site inspection processes and results: the manufacture date for brushless dc motor in January 2014. The first step, the rotating rotor brushless dc motor with the hand, flexible rotation, no card lag phenomenon, prove that the bearing is good, not sweep chamber; The second step, open the brushless dc motor terminal box cover, smell the smell of burning strong insulation, ground and alternate with, is measured with a megger insulation resistance are 0 m Ω, determine all insulation failure; The third step, turn the brushless dc motor end cover and whole burnt coil, color black, belongs to the typical overheating fault, service personnel to check the site, the brushless dc motor installed at the bottom of the belt conveyor position, surface radiating rib in brushless dc motor with waste residue and stones, blocked the cooling air duct, brushless dc motor caused by poor heat dissipation, secondly, conveyor at work because of stones throughput change is bigger, cause when the current high low, frequent overload is used, based on the analysis of the above situation, brushless dc motor is frequent overload resulting heat, cooling air duct blockage and difficult to heat dissipation, resulting in brushless dc motor burn down. Whole black is a typical case analysis: coil overheating fault burning, belongs to the field environment and bad working condition, when used to clear in time covering on the surface of the brushless dc motor, or do guard over the brushless dc motor, avoid sand plug ventilation, runtime control good throughput, prevent overload; In the use of the scene, the following factors are likely to cause BLDC motor overheating fault: 1, frequent starting; 2, equipment jammed have blocked; 3 the scene environment temperature more than 40 ℃ or at an altitude of more than 1000 m; 4, the space is too small, bad heat dissipation; 5, voltage too high or too low.