UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Mini-drill; Speed Controller Problem

orbanp1 · 27th Nov 2017, 7:15 pm

Hi B,

There is quite a bit of information is missing on that web-page.
That DC motor can have different versions (even when assuming that it is a brush-type motor), all having different characteristic curves (speed, voltage, torque, current). You could (and should) tailor the regulator characteristics to a particular motor.
The basic circuit as presented on that web-page indeed increases the output voltage as the load current increases, according to the simulations.
There is quite a bit of latitude in tweaking the component values though, and that is where simulation can help.

Regards, Peter

27th Nov 2017, 7:15 pm	#6
orbanp1 Heptode Join Date: Nov 2009 Location: London, Ontario, Canada Posts: 675	Re: Mini-drill; Speed Controller Problem Hi B, There is quite a bit of information is missing on that web-page. That DC motor can have different versions (even when assuming that it is a brush-type motor), all having different characteristic curves (speed, voltage, torque, current). You could (and should) tailor the regulator characteristics to a particular motor. The basic circuit as presented on that web-page indeed increases the output voltage as the load current increases, according to the simulations. There is quite a bit of latitude in tweaking the component values though, and that is where simulation can help. Regards, Peter