What would happen if you soldered an NTC Inrush Current Limiter to the positive terminal of your cordless drill DC motor, in series with the lead coming from the pulse width modulator (PWM) trigger speed control? Would that make the drill response laggy?
Does the resistance change time vary much? What is that attribute called?
Thanks.
Resistance change depends on the type of construction and the temperature of the disc. I think about 5:1 is common for inrush limiters.
Time lag is a function of the power dissipation in the inrush limiter. That in turn is a function of the current and the resistance of the limiter. The latter decreases as the disc heats up.
There are a few good apnotes out there from Epcos and ametherm.
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