PWM, motor speed & encoders
Motor Speed (RPM)
RPM = (60 × f) / P
Synchronous speed of an AC motor given supply frequency and poles.
PWM Duty Cycle
D = tₒₙ / (tₒₙ + tₒⁱⁱ) × 100%
Percentage of time a PWM signal is in the HIGH state per period.
Encoder Resolution
Res = 360° / PPR
Angular resolution per pulse of a rotary encoder.