dc motor measurements

[danielsoy]

Dear ppl.

Need help to traduce oscilloscope voltage readings, to Torque, Angular speed and Back-emf from attached circuit.

Motor is a 550 watts hand-driller.

A-F mutual inductance, shaft inertia and friction are unknown and set by default.

The other parameters show its actual values.

Should I convert volts to Nm, rads x seconds and Volts directly?

Are those values logicals or outrageous?

Thanks a lot.

[Omar_R · Accepted solution]

Hello danielsoy

The first thing you need to find is the relation voltage (or current) with Torque. It think there´s is an ecuation that relates current and Torque. Then, knowing the torque and the shatf inertia you can yield the angular aceleration of the wheels. Doing some numeric integration you can calculate the angular speed of the wheels. That´s the way you can approach the problem. With an encoder it would be much easier, cause you can measure angular position, speed and acceleration and with the acceleration you can yield the torque. 

Hopefully this information will help you.

[danielsoy]

OK Omar . thanks for your help.

That was pretty useful.

[tipa]

Рассматриваемая модель электромотора не развивает 500 ватт. Модель из основной базы это делает