MICRO-STEPPING COMMAND OF HYBRID STEPPER MOTORS USED FOR ELECTRODE TOOL DISPLACEMENT OF SINKING EDM-MACHINES
Abstract
In the first part of this article, the authors make a short presentation of electrode tool displacement control system for sinker electrical discharge machining. The advantages of stepper motor used in kinematics chain are also mentioned. In the second part, the authors compare the principal type of current control trough the coils of the two phase bipolar stepper motors: wave, full step, half step, 1/4 micro-stepping uniform subdivision, 1/4 micro-stepping sin-cosine subdivision and make an intuitive presentation. The peak current limiting principia are showed in the third part of the article for circuit realised with digital and analog circuits. A conceived electrical schema used for Pspice simulation is also presented. The results of simulation confirm feasibility. An electrical schema for sine-cosine drive of bipolar stepper motor has conceived with digital and analog circuits which have been simulated. In the fourth part of this paper, the authors summary present principle of peak current control using digital signal controllers. Two physical drive modules were conceived and realised using DSC and measured current chronograms were presented.
References
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