Switched reluctance motor inverter
The thing about SR machines is you need to decay the current in the coil fast at the point of commutation otherwise you will be generating torque that will attempt to impede rotation.



If you were to fire each phase of an SR machine with a simple chopper circuit then the current will freewheel via the anti parallel diode and decay slowly (relatively speaking) via the zero-volt-loop you establish.



Exaggerated decay. Now consider the other 3 phases being fired to facilitate torque generation.


There are periods where there would be torque (as current would still be flowing) that would reduce the shaft torque.

(NOTE: it can be done with a single switch per phase as a form of a chopper but you need a split supply with split caps and a higher voltage rail to pull the energy out of the coil)

If you were to use a single phase H-bridge per phase you now have the ability to not only create  positive volt loop (to charge the coil), a zero volt loop (to maintain the current) but a negative voltage loop (to decay the coil fast).

If you then realise an SR machine doesn't care about current polarity when the coil is engaged (+ve current and -be current both setup flux that the rotor will react to) you then could remove 2 switches and 2 diodes from a classic single phase H-bridge.




Why is it called an inverter? Well the resultant waveform is AC