Digital Control of a Two Phase Motor

In this paper a two-phase motor control with an AtMega8 microcontroller is presented. The energy efficiency of motor-driven products is increased by adding variable speed control using a microcontroller. In this way, the motor can be operated in a wide range of speed and the implemented power saving procedures increases energy efficiency of motor-driven product. The motor is controlled by two Sinus Weighted PWM signals, displaced 90 degree in phase, with variable frequency and amplitude. To achieve greater efficiency the motor is started at low speed and accelerated to the operational speed. Also, at the first start the real power is measured for each operating speed, allowing in this way to find out the most energy efficient speed. The motor will be operated at this speed as much as possible.