Im wanting to use a small BYJ48 stepper as it nativly has enough steps on it to be coupled direct to my focuser shaft. In order to get more torque out of it I want to use it in bipolar mode and see what needs done to the stepper - I have a spare L293d baord and want to use this so how doe I wire this stepper up to that board when in Bipolar mode?
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Hi Craig
I believe, not having done this myself, that you have to open up the stepper and make some wiring/solder change. A simple google search should give you the details you need.
Do not expect a dramatic increase in torque though. Its a small stepper and even in bipolar mode is not suitable for heavier imaging trains.
Regards
Robert
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You mean the UNO + L293D Shield? yes - if the motor is bipolar. Torque is going to be a function of current and how much field the windings can generate - obviously a very small stepper lke the BYJ48 with very small coils and low current, even when geared, will have significantly less torque than a larger motor.
I believe it may be possible to run the BYJ48 in unipolar mode direct off the L293D shield. You could try that first before hacking the motor?
Regards
Robert
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Im wanting to use a small BYJ48 stepper as it nativly has enough steps on it to be coupled direct to my focuser shaft. In order to get more torque out of it I want to use it in bipolar mode and see what needs done to the stepper - I have a spare L293d baord and want to use this so how doe I wire this stepper up to that board when in Bipolar mode?
Hi Craig
I believe, not having done this myself, that you have to open up the stepper and make some wiring/solder change. A simple google search should give you the details you need.
Do not expect a dramatic increase in torque though. Its a small stepper and even in bipolar mode is not suitable for heavier imaging trains.
Regards
Robert
Thanks - And do I then just build the L293D circuit/build as if I was using a NEMA 17?
Hi Craig
You mean the UNO + L293D Shield? yes - if the motor is bipolar. Torque is going to be a function of current and how much field the windings can generate - obviously a very small stepper lke the BYJ48 with very small coils and low current, even when geared, will have significantly less torque than a larger motor.
I believe it may be possible to run the BYJ48 in unipolar mode direct off the L293D shield. You could try that first before hacking the motor?
Regards
Robert