The switched reluctance motor runs by reluctance torque. It has wound field coils as in a DC motor for the stator windings. The rotor however has no magnets or coils. It is composed of laminated iron sheets, which are stacked on the shaft. The rotor of the motor alignes as soon as the opposite poles of the stator become energised. In order to achieve a full rotation, the windings must be energised in the correct sequence. For example, if the poles a1 and a2 are energised then the rotor will align itself with these poles. Once this has occurred it is possible for the stator poles to be de-energised before the poles b1 and b2 are energised. The rotor is now positioned at the stator poles b. This sequence continues with c poles before arriving back at the start. This sequence can also be reversed to achieve motion in the opposite direction. This sequence can be found to be unstable while in operation.