Alternative to digital rotary encoder

[Railroader]

@backflip

Perhaps tachogenerator is an old term, but it means an electrical machine just like a DC motor, that provides an output voltage proportional to the applied rotational speed.

Thanks! Like a dynamo.

@backflip

A brushed DC motor can be used for that purpose.

Know that many Arduinos only have a 10 bit, 0 - 1023, ADC. Some use 12 bits, 0 to 4097. That's the resolution You will get.

@backflip

Its calculation rate of this loop is 5 kHz in this test.

I'm a bit outside my comfort zone now.

@backflip

In order to keep a low speed reasonable constant, the controller needs to work with a quite fast sample sample rate of the feedback and control.

You aim for the step response, reacting firmly to quick changes in the load?

You have more knowledge then I have, it looks like. Never worked with matters like this.

This or that kind of rotation decoder, it looks like the resolution of the controller is important. What does the tachometer output really look like? Is it AC or like a rectified AC? Filters do impact the responce time.