The main reason of the three-phase asynchronous motor three-phase circuit asymmetry is that the motor power factor is too low during no-load test and the zero drift caused by the three-phase circuit asymmetry. The main function of no-load current is for excitation,now,Reactive power accounts for most of the apparent power,The active power accounts for only a small part of the apparent power. Here is a small series with Senli motor to understand.

       1.Synchronous generator sets can be used as power supplies. Three phase symmetry of synchronous generator set is good,With the development of AC and DC speed regulation, the prime mover speed can be quite stable, and the frequency of synchronous generator sets can also be quite stable,Then it can meet the needs of motor test well.

       2.The test power supply is supplied by an independent transformer. Independent transformer power supply can be eliminated-In addition to the influence of power distribution imbalance on the motor test.

       3.Measuring asynchronous motor power by two-watt meter method.Three-phase asynchronous motorThe motor power can be measured by two - or three-watt meter method. When the power meter voltage coil is measured by the two-watt meter method, it is the line voltage,The effect of zero drift can be well eliminated. Therefore, it is recommended to use the two-watt-meter method to measure the power under permitted conditions.

       4.When the three-watt meter method is used to measure the motor power,It is recommended that the neutral point of the voltage coil of the power meter be connected to the neutral point of the power supply,This can also eliminate the measurement error caused by zero drift.

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