I have read a lot about using high frequency square/rectangular wave pulsed DC for motor speed control aka PWM-ing, but my question is a bit different.
What if I run a DC motor with a low frequency unfiltered sine wave pulsed DC? Let's say that I want to run a 12V linear actuator motor from the low frequency 50/60Hz AC mains voltage, using a suitable step down transformer and rectifying diodes but no capacitors or any sort of filtering. My assumption is that full wave rectification should work better than half wave.
What are the possible outcomes regarding energy efficiency and longevity of the motor with this setup?