Any one to know about stepper motor, please let me know and post your question in this forum. I will try to help you according to my knowledge.




rakib

Hi,

I have a stepper motor but I can't drive it. I have sorted it from a cannon printer. will you please tel me details how can I drive it using which circuit? or any other possible way ?


buppy
Tangail

See, how many wires your motor have. If it is 5/6 then it is a unipolar stepper motor. If it is 4, then it is a Bipolar.



Actually, printers have (as I found) unipolar motors. Before try to use a motor you have to know that motor is OK. For this you have to check the resistance of the coil. The end to end resistance of a coil is double from an one end to a common end (Red wire) resistance (see 6 wire motor). If it is not found then the coil is burned. So you have to repair the coil or forget about that motor.

If the coil is OK now you have to find out the sequence. For this you have to use a 6 to 12 Volt dc power supply. Connect the positive end of the power supply to the common (or commons) wire (6 wire motor) of the motor. Now, take a wire one end connected to the ground of the power supply and with the other end of the wire simply touch the other 4 wires of the motor sequentially like this: [1,2,3,4],[1,3,2,4],[4,1,2,3] or any other combination. You will find in a certain sequence the motor will rotate in a certain direction.



Mind it, you simply touch one wire the rotor will move one step. Next you touch another wire the rotor will move another step. You have to find a certain sequence when the rotor will move 4 steps in a certain direction.

I use the computer power supply (unscrewed from the CPU) because for this the motor can drive enough current from it as it can give more current.

rakib.

Hi rakib,

Thanks for this descriptive instruction. I have Identified it as your instruction that my motor is a 5/6 wire unipolar stepper motor. But now how can I drive it or control it ?



buppy
Tangail

Hi buppy,

You may use an IC as the driver of the unipolar stepper motor. Read out the following description.

Circuit Connections:
Use the circuit below to connect a 4-phase uni-polar stepper motor to a BASIC Stamp or Javelin Stamp. The ULN2803 may also be used and has enough driver circuits to control two stepper motors (be sure to verify motor current requirement versus ULN2x03 sink capability for multiple outputs).



Motor Connections:
Use the table below when connecting your stepper motor to the driver circuit.

I hope now you will be able to drive your stepper motor. Collect that IC-ULN2003/16 pins placed in the figure and connect it properly as the above description.


Thanks

______________________
Ram Krishna Paul (Dheeraj)
Site-admin

Thanks ...................... for your kind informations.