How to accurately measure the motor starting current

- Jan 24, 2019 -


The process of starting the motor is a dynamic process. In the actual test process, you want to accurately test it. Generally, it is completed by a waveform recorder with high sampling rate or a test instrument with waveform recording function. The test instrument with high sampling rate records the measured electric quantity and draws the transient waveform or trend curve. Generally, the following test methods are used:


Use an oscilloscope to measure - install a current ratio in the motor starting circuit (depending on the power of the motor, or the parameters provided by the manufacturer), and the secondary winding of the current sensor is connected to the oscilloscope to complete the measurement.


The fault recording device is used for measuring - the current sensor is installed in the motor starting circuit, and the secondary winding of the current sensor is connected to the fault recording device, and the recording is started during the starting process of the motor, and the measurement can be performed.


Measured with a portable power quality analyzer - a current sensor is installed in the motor starting circuit, and the secondary winding of the current sensor is connected to a portable power quality analyzer, which is measured during motor starting.


Test with a high-end motor test system - by setting parameters such as dynamometer sensor ratio and synchronization source, the start current can be tested effectively.

Power Analyzer is a universal test instrument and a necessary component of modern motor test benches. It can accurately test the motor parameters with high precision.

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