交流电力测功机是使用三相交流发电机作为加载设备，异步电机由变频器提供可变频率的驱动电源，并精确控制其转矩和转速。与其它测功机相比，交流测功机具有功率容易控制、转矩和转速控制精度高、动态响应时间短、结构灵活多样、高效节能和可靠性高等特点。

AC dynamometer has two working modes, which can run as both an electric motor and a generator. When running as a generator, the electric energy emitted by the dynamometer can be consumed on the load resistance and when conditions permit. It can also be fed into the grid for utilization. AC power dynamometer mainly includes three-phase synchronous motor dynamometer, winding asynchronous motor dynamometer and commutatorless motor dynamometer.
AC dynamometer is composed of an AC motor, torque speed sensor, AC frequency conversion speed regulation system and AC dynamometer measurement and control instrument. Their working principle is to reverse the alternating current emitted by the AC motor into direct current through the frequency converter, and then invert to alternating current to the Internet. The AC variable frequency speed regulation system controls the speed and torque of the prime mover by adjusting the grid current of the motor. The dynamometer can easily achieve two-way loading, and at the same time can still provide sufficient loading capacity when the speed reaches 0r/min; Its loading characteristics are zero speed to rated speed is constant torque characteristics, rated speed to maximum speed is constant power characteristics, which fully conforms to the load characteristics of power machinery; The electric dynamometer can be used as a power mechanical inverted drag prime mover.


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