The frequency of stepping motor drives decreases, and why does the stepping in electrical opportunity vibrate?
Stepper motor is in accordance with the input pulse frequency and pulse number to run, when the step motor at low speed, due to the low pulse frequency, running with vibration phenomenon, generally at low speeds to subdivide interval Angle, increase the pulse frequency, vibration phenomenon will be improved. Stepper motor can only be controlled by digital signal, when the pulse provided to drive, in too short time, the control system of pulse number is too much, also is the pulse frequency is too high, will lead to plugging a stepping motor. In order to solve this problem, we must adopt a method of slowing down. In other words, the pulse frequency of a gradual increase in the frequency of the deceleration should be gradually reduced when stepping into the motor. This is what we call a "slow down" approach.
To accelerate the process, by the base frequency (below the step-motor direct starting the highest frequency) and hopping frequency (gradually speed up the frequency of) acceleration curve (slow down the process or vice). The jump frequency is the frequency that the step motor is gradually increasing on the base frequency, which cannot be too large, otherwise it will cause a blocking and losing step. A deceleration curve is usually an exponential curve or a revised exponential curve, or a straight line or sine curve. Using a single chip microcomputer or PLC, you can achieve the addition of deceleration control. For different loads and different speeds, it is necessary to choose the appropriate base frequency and the jump frequency to achieve the optimal control effect. The exponential curve, in software programming, the time constant is stored in the computer memory, and the work is directed at the selection. Normally, the increase of the stepping motor is over 300ms. If you are using too short a time of acceleration, it is difficult for most stepping motors to achieve the high-speed rotation of the step motor.
Points frequency increased, to increase the pulse frequency accordingly, otherwise the motor speed will decline. Stepper motor as the name suggests is step by step to go can also be understood as a pause, jitter will obviously increase when speed is slow, but not creating turn, slow down if the motor won't turn, that's your connection error, or there is something wrong with the machine. Or the driver has a problem.
