Dc motor, if the voltage beyond 1 dc motor rated voltage more than 10%, or more than 5% below dc motor rated voltage, dc motor simple heating under rated load, temperature, should check and adjust the voltage. 2, degree of unbalanced three-phase power supply voltage and beyond 5%, causes the unbalanced three phase current, the dc motor rated fever, should adjust voltage at this time. Phase 3, a fuse circuit or power switch contact bad, lacks operation caused overheating, through correction or replacement of damaged components processing. 4, short circuit or stator winding circles or alternate with grounding, make current increases, the damage increases with the overheating. If the problem is not serious, only need to add insulation, serious windings should be replaced. 5, a phase winding of the stator circuit or a branch in parallel winding wire, cause three phase current balance and make the winding overheating. 6, cage rotor broken bars or wound rotor coil joint loose, maintenance network too much electricity and heat. For copper rotor for welding repair or replace, the rotor of cast aluminum rotor should be replaced. 7, bearing damage or excessive wear, etc. , make the stator and rotor touching one another, to see if there are any more loose bearing, stator and rotor is bad device. 8, winding connection is wrong, mistaking star into a triangle, or mistaking triangle star, running under the rated load, can make dc motor overheating, check the correct. 9, when the load is too large, should reduce load or switch to high power dc motor. 10, were taken there was something wrong with machine caused by overload, should be with mechanical view, ruled out of order. 11, if starting too frequently, should cut starting times. 12, using the environment temperature is too high,Beyond 40 ℃)Into the wind, make the dc motor is too hot, heat dissipation is difficult, to adopt measures to cool. 13, dc motors, both inside and outside is too much dust and oil, heat, should remove dirt and grease. 14, the inside of the dc motor fan, upside or not installed, should be the correct device, the damaged fan should be fixed or replaced.
