Stepper motor stepper motor three kinds of commonly used fluctuation frequency control measures: (1)Linear lifting frequency. This method is based on the stability of the acceleration of elevator, good stability, can be used for a wide speed change fast positioning method. Although accelerated time long, but the software is simpler. (2)Lifting frequency index curve. This way from the moment of frequency characteristics of stepping motor, based on the torque change with the frequency is derived. It is in line with the movement of step motor and deceleration process, can make full use of the useful torque of stepping motor, fast echo function better, lift time is short. Index of elevator control has strong ability of scrutiny, but poor balance when speed change is bigger, generally applicable to the machining of the echo to demand higher. (3)Parabolic rise or frequency. Parabolic rise and frequency will be linear lifting and exponential curve fluctuation frequency, make full use of useful at low speed torque stepper motor, the speed of time shorten, together and has strong ability of scrutiny, it is a good idea.
