Which run-up ramp is ideal and how quickly can I reach the maximum speed?
Support » FAQ » Stepper motors
The maximum acceleration behavior of the motor is determined primarily from the torque reserve at the desired operating point and the external inertial masses as well as the rotor moment of inertia of the motor.
Exponential acceleration comes closest to the shortest run-up ramp with an initially very high and then asymptotic incoming ramp at its maximum value.
The most frequently used ramp is, however, the linear ramp as it is relatively easy to program or adjust via an OPV. The dynamics of the linear ramp are, however, not significantly greater than in the e-function and plays a rather subordinate role in the case of longer transverse paths. If, however, travel paths and manipulating times that are as short as possible are required and the machine cycle is essential for the productivity of the machine, acceleration changes should be carried out and programmed during the ramp where the highest frequency jumps should be during start-up and the lowest at the maximum possible frequency.
Approx. 5-10 steps should be traveled with constant frequency between the run-up and braking ramp as, otherwise, double the speed change would occur and this would cause a dynamic overload of the motor while losing steps at the same time.
In addition to the linear ramp and exponential ramp, Nanotec also supports the S ramp which primarily ensures smooth transport due to jerk free acceleration and smooth deceleration and avoids typical load oscillations. The advantages of the S ramp are its flexible and optimum movement control. In particular, the S ramp is suitable for the most varied process methods such as the closed-loop control of the constant tensile stress during winding and unwinding; it causes less wear on different machine parts such as gears and cam plates.
