Two Phase Hybird Stepping Motor Subdivision Dirve Research

Stepping motors have the disadvantages of oscillation at a low frequency,out-of-step at a high frequency and low positioning accuracy. To solve these problems,subdivision driving is usually used. This paper quantificationally analyzes theelectromagnetic torque and its fluctuation when stepping moters use subdivisiondriving, and reaches the conclusion that subdivision driving make the stepping motorsrun more steadily and get higher positioning accuracy.The operation performance of stepping motor is mainly decided byelectromagnetic torque. Therefore, to study the influence of subdivision on theperformance of stepping motor is to work out the effect of subdivision driving onelectromagnetic torque. In order to research the influence of subdivision driving on theperformance of stepping motor, the thesis deduces the function equation ofelectromagnetic torque and fine points. Instantaneous electromagnetic torques, totaleffective torques and the total effective torque variances between subdivided drivingand full step driving were compared. the subdivided driving increases total effectivetorques, decreases torque fluctuations and increases torque ripple frequency, thusimproves step motor’s operating performance and stability, decreases operatingcovibration and increases positioning accuracy.On the basis of the former theoretical research, the thesis designs two phasehybrid stepping motor subdivision driver control system. The system, with thecybernetics core of TMS320F2812DSP of TI Company, uses Sine wave currentsubdivision technology and PWM to control the two-phase hybrid stepping motor. thesimulation experimental platform is set up and the results show that subdivided drivingeffectively overcomes the disadvantages of oscillation at a low frequency, out-of-stepat a high frequency and low positioning accuracy, enlarges the applied range ofstepping motor, and thus is practical.