The frequency conversion and speed regulation operation of the motor has gradually become a symbol of the times. The speed regulation of the synchronous motor is the frequency conversion and speed regulation control of the square torque load machinery such as the fan and the pump driven by the frequency conversion and speed regulation of the AC motor in the production process. Frequency conversion speed regulation control can obtain the best process effect and considerable energy saving and consumption reduction effect.

 

1

energy saving effect

The mechanical equipment driven by the traditional brushless excitation synchronous motor, such as fans, pumps, and compressors, works under power frequency and the power output is constant. When the process adjusts its flow and pressure, it will cause serious energy waste. Because the load changes, the flow rate is proportional to the speed, and the required power is proportional to the cube of the speed. Therefore, if the required flow rate is 80% of the rated flow rate, in this realistic situation, the use of modern frequency conversion speed regulation automatic control can save more than 45% of electric energy than the traditional regulation method.

 

2

Frequency conversion operation process control

The frequency conversion speed regulation operation is a stand-alone control system. The frequency conversion speed regulation operation process is basically the same as the frequency conversion speed regulation soft start process, but there are differences. The cranking drive motor drives it to rotate. When the rotation speed of the synchronous motor reaches 1% of the rated speed, the synchronous motor will command the control system according to the designed program after the excitation control is switched on, and the general control room will issue a “permission to switch on” “, that is, close the soft start high voltage switch signal indication of frequency conversion speed regulation operation. At the same time, according to the signal instruction, the general control room immediately closes the high-voltage switch of the main control circuit of the soft start control system of the synchronous motor frequency conversion speed regulation operation, so that the synchronous motor is in the soft start operation state of the frequency conversion speed regulation control.

During the soft start control process of the frequency conversion and frequency modulation of the synchronous motor, the polarity of the rotor magnetic pole of the synchronous motor remains unchanged, and the rotation is accelerated with the frequency of the frequency conversion speed regulation, and the voltage and frequency are gradually increased to make the synchronous motor run at the rated speed. Frequency conversion speed regulation soft start control.

During the operation of the synchronous motor with variable frequency speed regulation, according to the change of the actual load, the frequency conversion speed regulation control system and the micro industrial control electronic computer control system realize the stable and precise speed control of the vector operation control.

Before the stop of the synchronous motor in the frequency conversion speed regulation operation, the frequency conversion speed regulation operation device must automatically reduce the output current to zero, and block all the trigger pulses of the frequency conversion speed regulation operation device before it can give the “permission to stop” signal display. According to the command of the displayed signal, the master control immediately cuts off the high-voltage switching power supply of the main control circuit of the frequency conversion speed regulation operation control device, and ends the frequency conversion speed regulation operation control process.

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Post time: Apr-28-2023