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The relationship between frequency and current of frequency converter

2018-05-06 03:12:39

The relationship between frequency and current is determined by the characteristics of the motor, the motor is divided into constant torque, constant power, : belt conveyor, ball mill, mixer and 1.5, square, cubic decreasing torque load (: water pump, fan). Constant torque: The current and frequency are directly proportional [1:1 ratio] to a doubling of the reduction. 1.5 power reduction torque: The current decreases by 1.5 power as the frequency decreases. Decrement square torque: The current decreases to the power of 2 as the frequency decreases. Cubic decrement torque: The current decreases to the third power as the frequency decreases. In the DC voltage after the rectifier is rectified, the inverter contains the pulsating voltage of 6 times the frequency of the power supply, and the pulsating current generated by the inverter also makes the DC voltage change. In order to suppress voltage fluctuations, inductors and capacitors are used to absorb fluctuating voltage (current). Extended data: Inverter energy saving is mainly manifested in the application of fans and pumps. After the fan and pump load is regulated by frequency conversion, the power saving rate is 20% to 60%, which is because the actual power consumption of the fan and pump load is basically proportional to the third square of the speed. When the average flow rate required by the user is small, the fan and pump use frequency control to reduce their speed, and the energy-saving effect is very obvious. However, the traditional fan and pump use baffles and valves for flow regulation, the motor speed is basically unchanged, and the power consumption changes little. It is very important to use variable frequency speed regulating device on this kind of load. At present, the application of more successful constant pressure water supply, various types of fans, central air conditioning and hydraulic pump frequency control. Reference source: Encyclopedia - Frequency reference source: Encyclopedia - Current reference source: Encyclopedia - Frequency converter

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