The cause of the slow speed motor load runtime

1),2) the power supply voltage is too low,squirrel cage rotor broken bar 3) group,coil,or coil

short-circuit point 4),the coil or coil group has 5),the reverse phase winding 6) 7),overload,wound

rotor type a wholesalemotor.blogspot.com phase break 8),wound rotor type motor starting rheostat poor contact 9),brush and slip ring poor contact 2.The motivation of the voice is not the cause of the normal during operation 1),the phase of the stator and rotor brush 2),3),the rotor rubbing rotor blades touch shell 4) insulation paper,bearing the lack of oil 5),the motor with sundry 6),motor with buzz two phase operation 5.The motor shell charged reasons: 1),2) the power cord and ground wire to make wrong,be affected with damp be affected with damp,motor winding insulation aging reduce insulation performance (3),4) lead and junction box body contact,local winding Insulation Motor vehicle damage to wires touch shell relaxation stabbed 5),core wire 7) 6),grounding line failure,damage to the wiring board,or on the surface of the oil too much Excessive sparking 6.Winding rotor slip ring 1),2) slip ring surface dirt,brush pressure is too small (3) 4) jams,brush in the brush,brush deviating from the neutral position 7.The motor temperature rise too high or the reason of rotor balancing machine smoking 1),2) power supply voltage is too high or too low,overload 3),4),the stator winding single- phase running ground 5),6) bearing damage or bearing is too tight,the stator winding Group of turns or interphase short circuit 7),environmental temperature 8),motor fan duct not free or damaged.