A company's air conditioner uses a two-speed motor for speed regulation. If the inverter can be used for stepless speed regulation, the amount can be adjusted better, and the air is delivered according to the residual heat of the workshop. Synchronous motor speed regulation can be realized by changing the power frequency and the number of electrode pairs; asynchronous motor speed regulation is realized by changing the power frequency, motor logarithm and slip ratio method.
Frequency conversion speed regulation is a speed control method that changes the frequency of power supply and thus changes the speed of the motor. It basically maintains the inherent characteristics of the asynchronous motor, that is, the characteristics of high hardness and small speed difference. Therefore, the frequency conversion speed regulation method has high efficiency and speed regulation range. Wide, high precision and smooth speed adjustment.
Frequency conversion speed regulation voltage frequency conversion speed regulation, current frequency conversion speed regulation and pulse width modulation (PWM) type frequency conversion speed regulation three types.
After the AC power supply is bridged by the diode and the capacitor is filtered, it becomes a constant DC voltage, and the PWF type inverter is composed of a high-power transistor, so that the control circuit controls the pass of each transistor of the PWM inverter according to a certain regularity. Broken, thereby obtaining a set of rectangular pulse waves of equal width and not equal width at the output of the inverter.