Stepper motor
Stepper Motors
Stepper motors move a known interval for each pulse of power, making them handy devices for repeatable positioning. Generally they come in two flavours: bipolar and unipolar. The Darwin design uses bipolar motors,.
Bipolar Motors
These motors are the strongest type of stepper motor. You identify them by counting the leads - there should be four. They are also the type of motors we are using in the RepRap Project's Darwin design. They have two coils inside, and stepping the motor round is achived by energising the coils and changing the direction of the current within those coils. This requires more complex electronics than a unipolar motor, so we use a special driver chip to take care of all that for us.US Suppliers
UK Suppliers
ST5709S1208-B 400-step/revolution motor from Nanotec Gmbh