Most drills are brush type motors -- AC/DC, not AC induction motors.
For the brush type, they work fairly well.
For induction motors, they work very poorly at frequencies much off from the design frequency (60 Hz US, 50 Hz UK -- both are close enough so they can be used mostly interchangeably as long as there is enough iron in the motor to handle the slightly lower frequency.
For a VFD (frequency synthesis via PWM) to work well, you want a true three phase motor.
Enjoy, DoN.
The Maximizer really did deliver claimed performance. The problem was a really kludgy temperature-sensing sub-circuit. PWM control is now integral to most trolling motors.
I think the introduction of switchers in PC (personal computer) supplies was about in that time frame more or less.
Ayup. Aerospace was doing that in the '60s. Detroit was doing it before that,without electronics: the venerable electromechanical voltage regulator was a switcher.
Millions of the 3524 family of ICs were used in PC, XT, AT & ATX power supplies. Of hundreds of dead computer power supplies I've looked at, I have only found a few bad ICs. Most computer power supply failures were bad fans, high ESR electrolytics, or shorted switching transistors. I used to salvage the requlators, but now I just pull the bad parts off the PC boards and stuff them into banana boxes till I need parts.
NTE has the NTE1720 in a pinch.
One of my sons is a silicon peddler repping ST. Nuff said?
Where is the challenge in that? Anyway, Silicon has really small pedals. :)
That mechaism IS an optical tachometer.
haha. What did all the junk "do"?
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.