Permanent magnet DC motor with commutators.
Motor rated for a max of "i" amps continuous at max of "e" volts. Stall current is "is." Switching frequency is f. Mosfets rated for 1.5 * e and 2 * i. Driver intends to detect a current higher than "i" and stop the drive pulses somewhere between "i" and "is."
Of course, whenever the mosfet turns off, the motor will try to drive its current back through the circuit until the coil is out of energy. Usually you put some diodes in to dissipate this power and keep this kick voltage to about 0.7v. How many watts do these diodes need to dissipate? I suppose it would be something less than 0.7 * "i."