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## Main Question or Discussion Point

Good day everyone

I'm implementing a speed controller for a DC motor 220 v 2.7 A 1500 rpm.

I've already made and tested the firing circuit and the motor works fine in an open loop.

Now big problem the parameters of the motor are unknown and impossible to find. No time for mechanical procedures to find those parameters too.

I want to implement a speed controller with an inner current loop. the set point is from 0 to 10 volts .. the 2 P's and the 2 I's can be varied through potentiometers but online tuning for a motor that big is dangerous i guess. Can someone tell me how to do it ?

As a start what should be the gain of the current sensing signal (The Red Box in the pic) if the resistance used is 0.1 ohm 7 watts ...

The tacho Generator transfer function is 90v / 1500rpm .. i actuated it to be 10v at 1500 rpm to match the setpoint

http://img19.imageshack.us/img19/9941/controllerl.jpg [Broken]

I'm implementing a speed controller for a DC motor 220 v 2.7 A 1500 rpm.

I've already made and tested the firing circuit and the motor works fine in an open loop.

Now big problem the parameters of the motor are unknown and impossible to find. No time for mechanical procedures to find those parameters too.

I want to implement a speed controller with an inner current loop. the set point is from 0 to 10 volts .. the 2 P's and the 2 I's can be varied through potentiometers but online tuning for a motor that big is dangerous i guess. Can someone tell me how to do it ?

As a start what should be the gain of the current sensing signal (The Red Box in the pic) if the resistance used is 0.1 ohm 7 watts ...

The tacho Generator transfer function is 90v / 1500rpm .. i actuated it to be 10v at 1500 rpm to match the setpoint

http://img19.imageshack.us/img19/9941/controllerl.jpg [Broken]

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