Variable-Reluctance Stepper Motor Half-Step Operation

Variable-Reluctance Stepper Motor Half-Step Operation

Variable-Reluctance Stepper Motor Half-Step Operation Modify the sequence of the applied pulses A A&B B B&C C C&D

D Variable-Reluctance Stepper Motor Half-Step Operation Excite phases A & B Rotor moves a half-step to 7.5

Variable-Reluctance Stepper Motor Half-Step Operation Excite Phase B Rotor moves another halfstep to 15 Variable-Reluctance Stepper Motor Holding Torque Holding torque

Static torque The maximum load torque that can be applied to an energized stepper motor without having it slip poles Here, A is energized and the rotor is at rest Variable-Reluctance Stepper Motor

Holding Torque Force the rotor one 15 step clockwise The force of attraction on rotor teeth 1 and 4 by the stator teeth 1 and 5 will develop a restoring torque Releasing the rotor will cause the rotor to fall back to the

original position Variable-Reluctance Stepper Motor Holding Torque Force the rotor two 15 steps clockwise (30) Rotor teeth 1 & 6 (and 3 & 4) have equal forces of attraction from stator teeth 1 & 5,

resulting in an unstable equilibrium. If the rotor is released, it could go two steps either clockwise or counter-clockwise Variable-Reluctance Stepper Motor Holding Torque

Here, the rotor is shown to have moved two additional steps clockwise Static-Torque as a function of the number of steps of displacement

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