PWM demo for my 7 x 10 minilathe

I'm upgrading my motor controle for my 7 x 10 minilathe, I'm converting it from my original class A amplifier analog design with current feedback, to my version of PWM with current feedback for torque control.

This is a very quick demo. of my version of design using all discrete transistors, for my PWM with torque feedback circuit, that I am going to use for my mini lathe.


I still need to design the oscillator circuit for it, but the main design of getting a pulse width modulation, and feedback for torque control was the aim for this experiment.

1572203904712.png


The top circuit disconnected with the relay is a idea for a possible current foldback circuit, instead of using inline fuses on the DC side of the supply.

have fun in the shop.

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