Analysis of measurement methods for stepper motor speed changes

Stepper motors can only be controlled by digital signals. When pulses are provided to the driver, the control system sends too many short-duration pulses, that is, the pulse frequency is too high, which will cause the stepper motor to stall. To solve this problem, acceleration and deceleration must be used. In other words, when the stepper motor starts, the pulse frequency needs to be gradually increased, and when decelerating, the pulse frequency needs to be gradually reduced. This is what we often call the "acceleration and deceleration" method.

Therefore, when the stepper motor starts at high speed, it is necessary to increase the pulse frequency, and there must be a deceleration process when stopping to ensure the precise positioning control of the stepper motor. The principle of acceleration and deceleration is the same.

Taking acceleration as an example: the acceleration process consists of the base frequency (lower than the highest frequency at which the stepper motor starts directly) and the jump frequency (the frequency of gradual acceleration), forming an acceleration curve (that is, the deceleration process is the opposite). Jump frequency refers to the frequency at which a stepper motor gradually increases from its base frequency.

Exponential curve, in software programming, first calculate the time constant and store it in the computer memory, and click it during work. Usually, the acceleration and deceleration time of a stepper motor is more than 300ms. If the acceleration and deceleration time is too short, most stepper motors will have difficulty achieving high-speed rotation of the stepper motor.

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