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Commutative analysis of a stepper motor drive

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  1. Introduction
  2. The power drivers
    1. Design consideration
    2. Recovery on high voltage
    3. Series resistance driver
  3. The main applications and the future scope
  4. Conclusion
  5. Bibliography

In this paper, the designs of the various drives of the stepper motor are presented. The main objective of this paper is to analyze the various drives of the stepper motor. Basically the Design consist four sections. First part is power supply. We required two supply 5v and 12v. Second part is clock circuit which generates the clock pulses for sequential logic circuit. Third part is sequential circuit which generates the four logic sequences for driver circuits. And the final and most important part is driver circuits, Which consists of a total of four drives. Basically the project hardware consist of four sections. First part is power supply. We required two supplies 5v and 12v. Second part is the clock circuit which generates the clock pulses for sequential logic circuit. And the final and most important part is the driver circuits, Which consists of a total of seven drives. Keywords: Diode Suppression, Diode-Resistance Suppression, Zener-Diode Suppression, Capacitor Suppression, Recovery on High Voltage, Series-Resistance Driver.

[...] Some variations of the series-resistance drive scheme are: The number of resistors may be reduced by placing only one resistor in the common return lead of the motor or in the power supply lead. Fig 2.7 b shows the output waveforms of the voltage and current of the series-resistance driver circuit without load and fig 2.7 c shows the output waveforms of the voltage and current of the series-resistance driver circuit with load. Fig 2.7 a Series-Resistance Driver Circuit Fig 2.7 b The output waveforms of Series-Resistance Driver Circuit without load currents when the motor is at detent position. [...]


[...] In addition, as the motor rotates it generates a back emf, Eb, which acts against the supply voltage An equivalent circuit of the winding of one phase of the step motor is shown in fig 2.1 Typically, the winding resistance tolerance is plus or minus 10%. Since most step motors are designed to operate quite hot, in the order of 100 degree centigrade case temperature, as the motor heats up during operation, the winding resistance increases. It is not unusual for the winding resistance to vary up to 25% during normal operation. [...]


[...] If the stepping rate is low in comparison to the motor time constant, the average current seen by free-wheeling diode will be much less, and often the diodes can be eliminated without damaging the power transistors Fig 2.2 a Shows the schematic diagram of a typical driver stage for a two-phase hybrid step motor with a freewheeling diode connected across each motor phase winding.Fig 2.2 b shows the output waveforms of the voltage and current of the diode-suppression circuit without load and fig 5.2 c shows the output waveforms of the voltage and current of the diodesuppression circuit with load. [...]

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