Motor-control scheme yields four positions with two outputs


Posted on Aug 25, 2012

Figure 1 shows how to position a mechanical device into four discrete positions but with only two free outputs and one free input from the control system. The position depends on a set of cams and four corresponding limit switches. The 24V-dc motor comes with a worm gear. Darlington transistors Q3 to Q6 and resistors R7 to R12 form an H-bridge that drives the dc motor, M. Diodes D3 to D6 protect these transistors from inductive spikes.



The outputs of the controller (not shown), connected to the Control 1 and Control 2 inputs, have open-collector structures that connect Control 1, Control 2, or both to ground upon activation. If you activate neither Control 1 nor Control 2, Q3 and Q5 co




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