stepper motor tester

To build astepper motor tester, the circuit contains two sets of drivers that can support both unipolar and bipolar stepper motors. The control circuit and driver circuit are in separate power supplies that can work on a wider rangeof different power suppliesof motors. Themotor driver can support motors with power supplies from 5V-24V. The stepper
stepper motor tester - schematic

tester contains three major sections: the clock generator, phase sequence of waveform logic, and power transistor drivers. The 3 switches are used in the circuit for theselection offorwards / backwards movement, motor start-and-stop control, and a wave / full step drives. The tester does not provide a half-step drive. In the circuit diagram, the clock signal from the oscillator connects to the 74LS193, an up/down binary counter. When theclock signal connectsto the count-up input, itwill generate the pulse sequence to the stepper motor in a clockwise direction. It will turn counter-clockwise if the count-down input is used. The 74LS139 decodes the two-bit counter output and generate the 4-phase pulses to drive the stepper motors in the 4-phase terminals respectively. Driving the unipolar and bipolarstepper motors are the same, but each phase will pulse alternatively. There are three methods used to drive, but the wave drive is the simplest way: a pulse is applied to each of the coil terminal at a time. The half-step applies pulses to one or two coils alternatively. This will create finer movements. The half-step drive will have double the amount of steps / revolution. As the torque is unequal in each step, it will cause more vibration. In the diagram, four Darlington NPN transistors are used to drive each coil terminal. Only 1 transistor is turned on at a time in a wave drive. In a full-step drive, it will always have 2...

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