CNIn terms of its original design intention, the speed control motor is specially used for AC speed control, but the most direct reason for the rise of the frequency conversion speed controller is the simple structure, low cost and convenient speed control of ordinary asynchronous motors. If the frequency conversion speed controller must be equipped with a special frequency conversion motor, then there is a contradiction. Isn't the inherent simplicity, firmness and durability of the frequency conversion speed controller gone?
The impact on the motor and its performance during frequency conversion speed regulation No matter what control method is used for frequency conversion speed regulation, the voltage pulse output to the motor terminal is non-sinusoidal. Therefore, the analysis of the operating characteristics of ordinary asynchronous motors under non-sinusoidal waves is the impact on the motor during frequency control.
There are mainly the following aspects: Motor loss and efficiency Motors operating under non-sinusoidal power sources will have many additional losses in addition to the normal losses generated by the fundamental wave. It is mainly manifested in the increase of stator copper loss, rotor copper loss and iron loss, which affects the efficiency of the motor.
Many manufacturers and salesmen brag about how high the power saving rate of inverters is, and users also believe it. They spend a lot of money to choose inverters just to save electricity, but the results are greatly disappointed. Whether power can be saved after using the inverter is determined by the type of load it drives. For fan and pump loads, the energy saving effect is remarkable after using the frequency converter, but for constant power loads and constant torque loads, the energy saving effect is much worse, or even can not save electricity.
