In this article, the editor will talk with you about the reasons for the starting current of the motor, and we want to help for future use.MotorAn electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction.Frequency conversion speed motorA general term for motors driven by frequency converters.In fact, the motor designed for the frequency converter is a special frequency conversion motor. The motor can achieve different speeds and torques under the drive of the frequency converter to adapt to the changes in the demand of the load.Explosion-proof motorsA type of motor that can be used in flammable and explosive plants, and it does not generate sparks during operation.Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemical and chemical industries.In addition, it is also widely used in sectors such as textiles, metallurgy, city gas, transportation, grain and oil processing, papermaking, and medicine.When the induction motor is in a stopped state, from an electromagnetic point, such as a transformer, connected to the power supply corresponding to the primary winding of the transformer with the stator winding, to closing the rotor winding corresponding to the transformer with the secondary winding is short-circuited; the stator winding and the electric rotor winding , There is only magnetic contact, from the magnetic flux in the stator air gap, the non-contact between the rotor core and the closed circuit.At the moment of closing, the inertia of the rotor will not cut the rotor windings up at the speed synchronized with the maximum cutting speed, rotating the magnetic field, the rotor from the induction potential winding can reach the highest in the rotor, therefore, when a large current flows in the conductor, the offset current The magnetic stator magnetic field is produced, when the secondary magnetic flux of the transformer cancels out the same effect of the magnetic flux.

In terms of stator structure, in order to maintain the original magnetic flux that is compatible with the working voltage level of the power supply at that time, the enterprise automatically passes an additional current.Because at this time, because the current of the rotor can be very large, the current of the stator has also increased, even as high as 4 to 7 times the rated current. This is the reason for the large start-up control current in China.The current after starting and why it is small: As the motor speed in our country continues to increase, the speed at which the stator magnetic field cuts the rotor conductor gradually decreases, the induced electric potential in the rotor conductor decreases, and the current in the rotor conductor also decreases, so the stator current is used to offset The part of the study of the influence of the magnetic flux generated by the rotor current also reduces the current, so the stator current is increased from large to small until it can be normal.