improving high speed performance of stepper motor systems 2012-02-09

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Bipolar drives supply stepper- motor windings with current waveforms that look like square waves when fully stepping or sine waves when micro-stepping at a high resolution. The waveforms shown in the oscilloscope displays illustrate the drive current in a half-stepping mode, which is two discrete steps for every pulse delivered to the stepper motor over a speed range of 500 to 4000 half-steps/s. Unfortunately, as the step rate increases, less voltage Experts pretty much agree that motor current is proportional to torque output, and voltage is proportional to motor speed, but do you know when this is might not be true? By Daryle Cooper Senior Design Engineer, ElectroCraft Inc., Dover, New Hampshire is available to supply the required winding current. This is because the BEMF (back electro-magnetic force) voltage increases, which, in turn subtracts from the supply voltage and limits the average (RMS) current during the ON time of the phase winding energized by the drive. At a critical step rate, the current fails to reach the set-point value, and the system behaves like a stepper motor powered by a voltage drive. The series of oscilloscope images show how the IMPROVING HIGH-SPEED PERFORMANCE OF HYBRID STEPPER MOTORS waveform continues to deteriorate at faster speeds: its amplitude decreases and progressively less current reaches the motor. A typical ElectroCraft stepper motor and SA4510 bipolar drive intended for numerous motion control applications where precision rotational displacement and speed control are required.

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