I have an actuator which is rated at 12 VDC input voltage (0-15) with a maximum allowed duty cycle of 20%. The already existing voltage levels in my system are 5V and 22V, and since I am weight constrained I would rather not add another step-down converter. 

What would be the implications of running at a higher voltage (22 Volts) and a lower duty cycle, say 11%, resulting in the same *average* voltage and current? My PWM-frequency is about 20kHz and the motor is a simple brushed, dc motor.

More specifically, would I get away with it, without damaging my motor and severely reducing its Lifespan?