Microcontroller homework 07
concept, but a realstepper would have stator windings surrounding the rotor. The PM stepper
has more torque than an equivalent VR stepper.
The hybrid stepper essentially adds teeth to a permanent magnet motor,resulting in better
coupling of the magnetic field into the rotor and moreprecise movement. In a hybrid stepper,
the rotor is split into two parts, anupper and lower. One half is the north side of the magnet
andone is the south. The teeth are offset so that when the teeth of one magnetare lining up
with the mating teeth on the stator, the teeth on the other arelining up with the grooves, the
tops of the teethare crosshatched for clarity). Some hybrid steppers have more than one
stackof magnets for more torque.
2. There are two types of stator winding methods forstepper motors: bipolar and unipolar.
Bipolar windings use field coils with no common connections. The coils must be driven
independently to reverse the direction of motor flow and rotate the motor.
annaabi.ee 
