What is a frequency conversion motor?In simple terms, the current will be 7-8 times the operating current when the AC motor starts.General small AC motor current will not be too large, it is directly started.But the large AC motor is more than 7.5kW motor start time is very large, this time the direct start will cause the motor to heat damage in addition to the impact of the power grid is also great,so need to add frequency converter.Frequency converter with the on-off of power semiconductor power frequency of also is what we call the 380 v, 50hz frequency change, frequency when the motor first starts, however, a little increase, realization of ac motor soft start, precise control of motor speed, overload and through the voltage protection, and other functions!
    Frequency control of motor speed in the speed range speed can be arbitrarily adjusted, and the motor will not be damaged, most of the general domestic general motors can only run under the conditions of AC380V/50HZ, general motors to frequency reduction and increasing frequency of use, but the range should not be too large, otherwise the motor will be heat and even burn.Within the ordinary fan cooling fan and fan machine with the same line, and separate the two is in frequency conversion fan. So ordinary fan at low frequency, may be burnt due to overheating.

    Due to the high frequency magnetic field under frequency conversion motor, so the insulation class is higher than the general motor, in principle, can't use the inverter to drive general motor, but in practice, in order to save money, in many need speed occasions instead of using ordinary motor frequency conversion motor, but ordinary motor speed control precision is not high, often in the energy-saving reconstruction of fan and water pump to do so. When using ordinary motor instead of variable frequency motor wave frequency of the frequency converter low point, as far as possible to reduce the damage of high frequency for the insulation of the motor.