Series and shunt wound motors powered by voltage and current sources

[Circlotron]

Shunt wound motor with voltage source = fixed rpm regardless of voltage.
Series wound motor with voltage source = revs to destruction.

Shunt wound motor with current source = fixed rpm regardless of current.
Series wound motor with current source =

Note - not talking about permanent magnet motors here?

[ConKbot]

Series wound motor with a current source with infinite compliance driving it at a significant portion of it's rated current would rev to destruction, or flash over, or overheat also.  The currents in the coils would of course be constant, making for a constant output torque, similar to a permanent magnet DC motor. The motor would accelerate till windage and bearing friction equalled that torque. In a "normal" motor that should be way beyond over-revving it, and the current source would just keep throwing more and more voltage at it as the BEMF increased.

A current source with limited compliance would just hit it's upper limit and become a voltage source, field weakens, you know where this goes.