Generating with the switched reluctance motor

The switched reluctance motor (SRM) is being developed for aircraft engine starter/generator applications. In these applications the SRM operates as a generator as well as a motor. This development is taking place because the SRM is unique in its operation as a generator compared to other machine types in that it does not employ permanent magnets or a field winding on its rotor. Thus the SRM generator does not possess the inherent problem of generating into a shorted winding like the permanent magnet machine (you cannot turn off the excitation). Because the SRM generator does not employ permanent magnets or a field winding, it is important to consider the nature of its excitation during generating in order to understand its operation and limitations. This is especially true during load faults or when generating AC. Also, as with all electric machines, the SRM as a generator is the dual of the SRM as a motor. This duality, in the case of the SRM, carries over into the control of the machine