STEPPER MOTORS

STEPPER MOTOR is a brushless DC motor whose rotor rotates in discrete angular increments when its stator windings are energised in a programmed manner. Rotation accurs because of magnetic interaction between rotor poles and poles of sequentially energised stator windings. The rotor has no electrical windings, but has salient and/or magnetised ploes.

Types of stepper motor

• Permanent Magnet (PM)
  

• Variable Reluctance (VR)
  


• Hybrid - Combination of both PM and VR

Different Coil cofigurations of stepper motor

• 4 wire Stepper motor

Stepper motors with 4 wires can be driven only in Bi-polar mode.

• 5 Wire Stepper motor
  

Stepper motors with 5 wires can be driven only in Uni-polar mode.

• 6 Wire Stepper Motor
  

Motor with 6 wires can be driven in both Bi-polar and Uni-polar mode.

• 8 Wires Stepper Motor
  Stepper motors with 8 wires can be driven in both Bi-polar and Uni-polar mode. These are rarely available in market.

Driving of stepper motor

• Full Step 2 phase driving

• Full Step 1 phase driving

• Half Step driving