westaust55
Moderator
Attached is a brief tutorial I put together covering stepper motors.
Reference is made in the early part of the tutorial to a microchip application note and a website at the University of Iowa. readers should in particular also download and read the mentioned Microchip application note for greater detail and understanding.
Since the links are not active in the attached pdf file here they are for convenience:
I have included some example PICAXE program code for full, wave and half step modes of control. These have been tested with a bipolar stepper motor and should work with a unipolar stepper motor as well.
I have also done some serious current limiting using a 3V 2.3 Ohm bipolar stepper motor taken form an old printer (no datasheet available ). Running at 4.5V and 6V with 8.2 Ohm 5 Watt resistors in series with each winding that limit the current to around 12 - 15% of the rated motor current.
The stepper motor would still turn with my finger applied with moderate-light pressure to the end of the 6mm diameter shaft.
Read and above all have fun . . . .
Reference is made in the early part of the tutorial to a microchip application note and a website at the University of Iowa. readers should in particular also download and read the mentioned Microchip application note for greater detail and understanding.
Since the links are not active in the attached pdf file here they are for convenience:
I have included some example PICAXE program code for full, wave and half step modes of control. These have been tested with a bipolar stepper motor and should work with a unipolar stepper motor as well.
I have also done some serious current limiting using a 3V 2.3 Ohm bipolar stepper motor taken form an old printer (no datasheet available ). Running at 4.5V and 6V with 8.2 Ohm 5 Watt resistors in series with each winding that limit the current to around 12 - 15% of the rated motor current.
The stepper motor would still turn with my finger applied with moderate-light pressure to the end of the 6mm diameter shaft.
Read and above all have fun . . . .
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