Speed control circuit of single-phase or multiphase induction motor by inverter

摘要

The present invention is for providing a single-phase or multi-phase motor by using an inverter method using a single-phase AC (or DC) power source to control a rotation speed and drive a stable multiphase motor.;Conventionally, when a three-phase motor is used, a three-phase power source is always required. This has caused a great overload in wiring work, as well as a general characteristic deterioration, as well as a difficulty in continuously changing the rotation speed and maintaining a smooth torque .;SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a method of driving a single-phase or three-phase or more polyphase AC motor in a single phase AC (or DC) power source, It is possible to connect a plurality of motors to one controller or to connect one or more coils in parallel on the same axis of one motor and to set the output frequency of the motor to an initial value The output frequency of the motor can be adjusted by the input switch of the CPU by 1Hz and can be set to 5Hz or 5Hz. It can be adjusted arbitrarily, so that it is possible to adjust the frequency more than 400Hz in case of using high-speed motor. It is.