| 1 | Stepper motor |
electronic driver schematics
The schematics from below shows a simple circuit that you can build to control commonly available stepper motors. Although the circuits are functional and the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others.
This is final version of a stepper motor electronic driver, which I used to build my CNC Engraver .
DIRECTION and STEP are connections points to Parallel Port at PC.
| Be carefully when you are "playing" with Parallel Port from PC. Better to use an additional Parallel Port Card. |
Design is almost "classical" (one variant of this are used also in originally printer driver). Four NPN power transistors boost the weak electronic signals into current powerful enough to drive the motor coils. The diodes next to each transistor short out the nasty backlash that is generated each time a coil switches off. As a coil's magnetic field collapses, the reverse induction can generate a momentary hundred volt spike that can fry electronics. Power transistors used as final driver, can handle with suitable heat sink, up to 5 A. Voltage's value for power supply depends on stepper motors characteristics.
Single-Coil
Excitation - Each successive coil is energized in
turn.
Another design for stepper motor driver .
Single-Coil
Excitation - Each successive coil is energized in
turn.
This driver can handle up to 1A stepper motors.... I tried to put in parallel two ULN2803's gates for each coil, and in this way I doubled the power to motors.
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