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Do cars also have DC motors?
yes car is using dc motor like in wipper / wipper pump motor a/c motor etc' and you can also use ac power by using a dc / ac inverter on your car and you plug your tv/pc/personal refgigerator etc' or even you power tools, you can buy that inverter at your nearest electronic or electrical shop. hope this messege helf you.
What are the construction tools?
Construction tools means the equipments that are used in constructiion of making houses ,buldings ,shops and much more. If you want to buy in affordable large variety of construction tools you can visit online Ernie's tools through your using search engine.
Where can I buy an electric motor that will run on 4 or fewer AA batteries with some kind of timer so that it could automatically shut off after a preset time?
Ebay.
Can I use a buck boost transformer I have an old building that the electric was upgraded to 120 208 volts but I have an old motor that was wired off the old 240 V grd b phase service?
Yes, you should be able to employ a buck boost Xformer to boost your 208V to the motors specified 240 V. Make certain when your buy or order the Xformer that it has taps to supply 240V specifically. Most will in that voltage range. The next important thing is that the new Xformer must be capable of supplying the full horsepower required by the motor. Transformer output capacity is measured in VA or volt-amps. In all praticality, this means watts. To get the number of volt-amps or watts your motor needs, multiply the number of horsepower of the motor times 746. ( 1 Horsepower = 746 Watts) example: a 3/4 hp. motor would need 3/4 or .75 X 746 W or 559.5Watts or volt-amps.Therefore a standard 500VA or .5KVA transformer wouldn't have quite enough output and you'd have to go to the next standard size 750VA. But the bottom line here is cost. Buck Boost Xformers are expensive. Figure out what the correct size of transformer you need to run your motor. Then price it out. Then price out a new 208volt motor of the same hp. rating as the one you have. If the motor is cheaper, well then there you go, just buy a new motor. Unless the BB Xformer is a lot less than a new motor, I'd advise buying a new motor and then you have a NEW motor instead of an old motor with a transformer and the hassle of wiring it up. ( For the record, the difference between the pure value of volt-amps and watts or power is that in alternating current, the CEMF, (counter electromotive force) creates a small power or wattage loss because of increased resisatnce. This is insignificant to smaller motors, i.e., less than 10 h.p.)
Where can I sell a large number of electric motors?
One can sell a large number of electric motor in buy and sell online auctions such as the following; H and H Buying and Selling, INC, Indiamart and EcReCon INC also buy and sell electric motors.
