Stepper motors

Stepper motor used in an open loop needs very carefully generated sequence of time intervals between steps. The following must be taken into account:

• the torque of the motor generally depends on rotation speed
• there are resonances at some rotation speeds

There are several solutions of this task, let count them in historical sense:

1. Fixed frequency, with single step torque. If you are old enough you may remember some old plotters, moving very slowly with the same sound frequency all the time.

2. Acceleration phase, constant speed, deacceleration phase. All two and more dimensional devices today are able to perform sinchronously such linear moves in several axes. In addition they are able to do circular movements by two axes. However if movement consists of more small linear moves there is an acceleration/deacceeration sequence for everyone. It is possible to see and hear that small pulls.

3. The most advanced method today. The time intervals are generated so that the speed does not exceed a limit defined by either the tehnology or torque limitation. The sequence of time intevals is generated for the whole path, i.e. from the point of the zero speed to the point of the zero speed. Not only linear and circular moves are possible, but any curve. The number of axes is not limited.

At ZAMISEL d.o.o. we can explain you all about the most advanced method for programming stepper motors on multi-axis systems. Take the course on Stepper Motors programming !