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Stepper Motors


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A2

Stepper Motors

Motor-Stepper.jpg   7.5o steps     3.75o steps 

For more precise control, a stepper motor is needed. These are used when accurate position control is needed. Examples include robotic movement control, printer head movement control and disk drive head positioning.

Unipolar Stepper Motor - Five or Six Connections

Connection 1 and 2 are sometimes joined together inside the motor.

Motor-Stepper-Unipolar.gif

Driver Circuit

Unipolar Stepper Motor Driver

Bipolar Stepper Motors - Four Connections

Motor-Stepper-Bipolar.gif

To reverse the magnetic field in the coils, an H-Bridge circuit is used. This is more complex than the unipolar arrangement above.

H-Bridge Drivers

This circuit is able to energise the stepper motor coils in either direction. Two H-Bridge circuits are used, one for each coil.

Stepper Motor Drivers

A Possible Physical Layout

Here is an approximation of one possible physical layout for a stepper motor. Only two of the eight coils are shown.

Motor-Stepper-Structure.gif

 

 

 

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