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Micro-motor production: micro-motor production starting current principle specific analysis

2020-09-02 11:19

In the application of micro-motor production, when starting, the current produced by the micro-motor will be in a high current state. After starting, the current will become smaller. What is the reason for this? Follow Weizheng Motor to understand the principle of starting current produced by the micro-motor.

From the perspective of the starting principle and rotation principle of micro-motor production, when the micro-motor stops, it is equivalent to a transformer from the electromagnetic point of view. The stator winding can be compared to the primary coil of the transformer, and the closed-circuit rotor winding is the short-circuit of the transformer. Forced convection coil.

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There is no electrical connection between the stator winding and the rotor winding produced by the micro-motor, only the magnetic connection. The magnetic flux will form a closed circuit through the stator, air gap and rotor core. At the moment of closing, the rotor produced by the micro-motor will not rotate due to inertia. At this time, the rotating magnetic field will cut the rotor winding at a relatively large cutting speed, and the induction of the rotor winding will reach a high potential, therefore, a relatively large current will flow in the rotor conductor produced by the micro-motor, and the current produced by the micro-motor will affect the magnetic energy of the stator magnetic field.

In order to adapt to the original magnetic flux, the stator will increase the current. The current of the rotor is very large, and the current of the stator will also increase, which will be several times higher than the rated current. This is the main reason for the micro motor production starting current.

Then the current becomes smaller after the micro-motor production starts, which is a good explanation. With the acceleration of the micro-motor production speed, the speed of the stator magnetic field cutting the rotor conductor will decrease. Similarly, the induced potential in the rotor conductor will also decrease, and the rotor current will decrease, so the influence of the stator current on the magnetic flux will decrease. Therefore, it is normal for the micro-motor production current to change from large to small from start to normal operation, it is not a failure in the production of micro-motors.

shenzhen only motor development co., ltd. is focused on the production of stepper motor, push rod dc motor, precious metal brush motor, automotive micro motor micro motor such as national new and high technology enterprises, welcome to inquire.

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