2, the reason of common breakdown
1. Electromotor did not start moment of force, or when carrying for nothing, cannot start, give out abnormal sound. Reason:
(Circuit of L) three-phase power source (include winding of stator of brake knife switch, down-lead) one photograph cuts off the power, cause single-phase start.
(Voltage of 2) power source is too low.
(3) bearing is excessive wear away, make rotor stands by a side of stator, cause stator and rotor different heart, air gap is inhomogenous.
2. The electromotor moment of force that start is small, have when carrying, cannot start, the electric machinery when load increases stops turn, give out intense hum sometimes, local and calorific. Reason: Voltage of electrified wire netting is low, winding has circle a short circuit, there is a line in rotor winding or sealing off phenomenon, the one photograph after starting breaks a line to cause single-phase move.
3. The electric current that start is big, and lopsided, noise is big, create protector movement and dump. Reason: Method of stator winding wiring may be incorrect, winding is isolated from rightly ageing.
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