bobc wrote:Would you believe I made one (a synchronous reluctance machine) out of a small induction machine.... I'll see if I could "liberate" it from work.......
You may find if the induction machine was well designed, it makes a terrible stator to use for SR. This is because if the tooth head worked well for induction or PM, it's setup to guide the change in flux to ramp sinus (or at least smooth-ish). As the torque in SR depends on how dramatic the change in flux gets, they generally require straight stator teeth with no hammer-head tip for good SR performance (as you see in this gentleman's motor above).
Something else very slick you mentioned about the rotor mass issue is the SFP (short flux path) design rotors can just use little "U" shaped segments of steel to link flux just as far as it needs from tooth head to tooth head VS a huge lump hub of rotor iron and the flux path always crossing through the center of the big lump like you see in stepper motors etc.
SR controllers don't need full-bridges on phase legs, which is great for avoiding shoot-through drama on controller development. It also reduces hysteresis in the iron loss from the field always being in the same direction rather than flip flopping.
With only 3 phases they often have a LOT of torque ripple when you make them high specific torque density, but more-so than any other motor SR lends itself towards going poly-phase way beyond 3p, as each phase in the controller doesn't need to be anything more than a single switch/FET if you have a common star termination for all the phases at the motor.
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