Inverters are power supply devices that control the frequency (Hz) of three-phase induction motors to vary speed continuously. Speed can be controlled by changing frequency because the speed of rotation of      induction motors is determined by the number of poles and the frequency. For example, a four-pole induction motor will rotate at a constant speed of 1500 min-1 at a power frequency of 50 Hz or

           1800 min-1 at 60 Hz. Here, the speed of the motor can be freely varied, regardless of power

                        frequency, by installing an inverter between the power supply and the motor.

Belt-type Stepless Speed             Changer Units

       Solid-shaft Speed Changers and Reducers

Zero-Max Stepless     Speed Changers

  Stand-alone, Belt-type Stepless Speed Changers

Speed Changer Belts


DC Motors

    Hollow-shaft Speed

Changers and Reducers