The principle block diagram of ac frequency conversion controller

 AC Induction Plastic motor fan 
Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience 
The principle of frequency conversion controller block diagram as shown in figure 5, it mainly consists of the following links, namely, rectifier, filter, inverter power. Computer control system permanent magnet motors for sale of frequency converter, the signal analysis processing, from the sample points and the new internal waveform control signal, then through amplified to control the frequency conversion switch, a corresponding frequency simulation three-phase ac voltage, supply of compressor. Rectifier filter principle: rectifier is a device that converts ac power to dc, adopt silicon rectifier element bridge connection, the structure can be divided motor parts into single-phase and three-phase rectifier power input. 


115/120 V AC Voltage and Three-phase Phase small 240v electric motor

Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
General frequency conversion air conditioner control rate under 2 kw single-phase power input, when electric rate in more than 2 kw, three-phase power input. The difference between single-phase and three-phase rectifier circuit is added two more in the current rectifier diode. The role of the filter circuit is to make the output dc voltage for a smooth, often with large capacity capacitor, capacitance between uf is in induction motor prices commonly 1500 ~ 1500. Because of large amount of the capacitor, discharge time is long, so when maintenance frequency converter should be first capacitor discharge. Discharge in the second wire by a large resistor in parallel in 500 Ω capacitance two side, if not discharge, maintenance will be injured in accidents.