The frequency changer is the motor velocity modulation control power
source, compares with the traditional constant speed exchange
actuation system, has saves the electrical energy, the automation and
enhances the productive forces, the high frequency gets up stops and
is reversing cuts, large capacity, the high rotational speed and the
high voltage movement, the structure simple, realizes the soft start
and fast applies the brake, the explosion-proof, the environment
adapts broad, the service reduces effort, the volume small and the
construction cost is low and so on the characteristic Widely applies
to the steel rolls over, the railroad, the water pump, the compressor,
the electrical appliances and so on each transmission system electric
motor