Locked-in current refers to the current measured in the static state of the rotor. Motor locked-in is a situation in which the motor still outputs torque when the speed is zero, generally mechanical or artificial. Torque motor manufacturers will take you to a simple understanding of the related locked-rotor current.

       When the load of the three-phase asynchronous motor is too large, the dragged mechanical failure, bearing damage, and the motor sweeping failure may cause the motor to fail to rotate. When the motor is blocked, its power factor is very low, the blocking current is large, and the time is slightly longer, which is likely to cause the motor winding to burn out. However, in order to test some performance of the motor, it is necessary to carry out locked-rotor test on the motor, which is carried out in the type test and inspection test of the motor.

       The locked-rotor test is mainly to measure the locked-rotor current at the rated voltage. The value of lock-rotor torque and lock-rotor loss, through the analysis of the size of lock-rotor current and the three-phase balance, reflect the reasonability and some quality problems of the magnetic circuit composed of stator, rotor winding and stator.

       During the motor type test, there are more voltage points measured by the locked-rotor testTorque motor manufacturersIn the factory test of the product, a voltage point will be selected for determination, generally in accordance with the rated voltage of the motor one-fourth to one-fifth of the test voltage selection, such as rated voltage220VWhen unified selection60VAs the test voltage, the rated voltage is380VWhen, select100VAs a test voltage.

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