You may be correct. The mill-drill motor is an induction type, (with startup cap).
I just used a flash light and mirror to check out the blower motor
on the old wood stove (that's been sitting unused in the fireplace for many years).
And, it looks like induction type, but no capacitor. I've used a lamp dimmer to control it (works fine).
I don't have a router, and I wonder what kind of motor they use.?.
I'm assuming those are regular brush type motors. Like a circular saw.
Variable speed hand drills use brushes, and I'll bet the trigger unit contains
a circuit, much like a light dimmer..
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