Three-phase no-load current of 2.5 0.75 KW motor,what reason be

Two sets of 0.75 KW...Grade 4...380 v...The motor.No-load current is between 2.3 to 2.6...Work environment textile...'a lot...Rated current of the motor is only 2.2...Normal no-load current is around 1.6...Time machine completely under the condition of no load over current...Due to the current big.So high temperature sharply born...Will soon.motor magnet Overheating damage...Please say the reason...thank you Problem complement: I thank two answer first...Disease,and together,the two are not normal before.In a few years later.

You'll find the bad one current is increased.[.Repair of the motor are friends.Eliminate offline ribbon...Until now,with or without load...motor run capacitor Motor current is bigger...Last year when the motor current in 2.0 A...Now 2.4-2.5 A...Motor shaft sleeve inside and outside in good condition...Have not completed...Don't go...Just electric pilot time to run the old hot...Often the temperature in the 60-80 degrees...Wiring is right...electricalmotor1.blogspot.com Are the normal installation...There is a reason,is you pick the wrong wiring.380 v y connection.You make into 380 v delta connection.So,motor heat quickly.This is one of them.In addition,the machine is idle for motor vehicle a long time,must have certain load.If is in use after a period of time (excluding intervention had gone wrong),should be the result of mechanical failure.1 bearing damage increase torque resistance.Run 2 bearing outer ring,which leads to the bearing wear gaps (cover),the rotor eccentricity running and friction with the stator (boring),increase the torque resistance.