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Extras Non Exam     Control Systems     Damping     Displays     Neural Networks     >Stepper Motors<    

Control Systems Stepper Motors


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  Extras Non Exam    Control Systems  0 of 12    Question 227    Control System Damping 
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Deadline not set4 of 12    Question 946    Motors 
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Normal or Stepper?

Big, high speed motors need to have a conventional design. Trying to move a really large motor in steps might rip it off its mountings.

Small precision motors with robotic accuracy need to have the stepper design. Accurate position control becomes possible.

Stepper Motor   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.

Unipolar Stepper Motor

Driver Circuit

Unipolar Stepper Motor Driver

Bipolar Stepper Motors - Four Connections

Bipolar Stepper Motor

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.

Stepper Motor Structure

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