The back EMF, along with the RL circuit in a brushed DC motor, brings non-linearity to the PWM control and the PWM frequency and PWM duty cycle become significant for getting the best output power.

The DC motor speed control project is intended to manage the pace of a DC motor by means of an 8051 sequence micro-controller. ... For receiving PWM indications, motor driver’s IC is connected to the ...

It’s an excellent way to learn about both PWM motor control and the use of 555 timers, all with a very low parts cost and readily available components. We’ve seen such setups before, used as ...