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　　Five reasons leading to excessive no-load current of variable-frequency speed-regulating motors

　　1. Large air gap of variable frequency speed control motor: The main reason is: because the rotor of the motor rotates in a ventilated atmosphere containing certain impurities for a long time, it suffers from the abrasion of impurities and dust in the atmosphere and increases the air gap, such as those operating in metallurgical enterprises The open-type motor has been operated for more than ten years, and the air gap has increased by about 15%.When the frequency conversion speed control motor sweeps the bore or the iron core is eccentric, the rotor is turned during maintenance, and the negative air gap is increased.

　　2. Increased iron core loss: During repair, because the notches are uneven and affect the wire embedding, the large notches are filed with a rough file to short-circuit the notch iron core punching piece, and the size of the notch increases, which increases the effective air gap of the motor.The iron core is corroded and rusted in a wet condition for a long time.When the motor was dismantled the windings, an open flame was used to burn the iron core and other incorrect methods, so that the insulation of the iron core punching pieces was corroded and the punching pieces were short-circuited.The rotor core is not aligned with the stator core, and the rotor core may be reversed.The iron core is severely fanned.

　　3. The number of winding turns is eliminated or the coil pitch becomes smaller: the elimination of the number of coil turns increases the magnetic flux density, and the core loss is proportional to the square of the magnetic flux density, resulting in a substantial increase in iron loss.The smaller the coil pitch, the lower the short-distance coefficient of the winding, and the elimination of the effective number of turns of the motor, which results in an increase in iron loss and an increase in no-load current.

　　4、变频调速电机绕组接线错误：如1Y接法误接成1Δ接法，1路误接成2路等。1Y接法误接成1Δ接法，相当于每相绕组匝数低落√3倍;1路误接成2路，每相绕组匝数低落50%，导致空载电流大大增加。

　　5. If the rotor of the motor is not installed, the positive and negative air gap is uneven, and the shaft may be bent, the bearing may be obstructed, etc., which will increase the no-load current.Due to the increase of no-load current, the power factor of the motor is reduced.When the rated voltage UN and rated current IN of the motor are kept stable, the output power of the motor will drop due to the low power factor.If the motor is running under the rated load, then the electric timing will have a fever due to excessive current.

　　When the no-load current of the frequency conversion motor is 30% higher than the rated current of the frequency conversion motor, putting into operation will cause the motor to have a serious fever, burn the insulation material of the frequency conversion motor, and finally cause the frequency conversion motor to burn.