You should check out a wholesale plant that sells them. You can ask a local autobody store or mechanic and they should be able to point you in the right direction of getting a good bulk deal.
try rockauto.com or your local junkyard
Three phase motors are motors which operate under three phase supply.Each phase is displaced from one another by 120 degrees.It produces three fluxes which are also 120 degrees displaced.
Check eBay. Or maybe just buy the NXT and motors if you already have a bunch of legos. Type your answer here...
A two-phase* system is archaic, and has been completely superceded by three-phase systems, so there is no demand for two-phase induction motors. (*A two-phase generator has two phase windings, displaced from each other by 90 degrees.)
Three phase electricity is used instead of single phase for industrial situations. Industries use three phase electricity instead of single phase to operate electric motors driving heavy machinery. Three phase electrical motors produce more power from the same amount of electricity and maintain steadier speed. Small portable motors such as drills and mixers use single phase. Motors used around the house are single phase. Motors used to run large industrial machines use three phase.
Starting capacitors are only required for single-phase induction motors. They are not necessary for three-phase motors.
No, commutator motors as used in vaccum cleaners for example do not use a starting winding. Single-phase induction motors need a starting winding without which they will start in either direction if given an initial twist.
* 3 phase motors * resistance heaters
Split Phase Induction Motor.
The best way to buy a motorcycle for less is to purchase a used or refurbished model. Some places to buy this type of motorcycle from include Craigslist, eBay Motors, and Swap Cycles.
The revolving field theory of single-phase induction motors suggests that a rotating magnetic field created by current flowing through two windings (main and auxiliary or starting winding) produces a starting torque in the rotor. This theory explains how single-phase motors can operate without the need for a separate rotating magnetic field, as in three-phase motors, by using a split-phase or capacitor start design to generate a rotating magnetic field.
http://ocala4sale.com/transportation/used-trucks-import.php has some listed sometimes. Or you can try ebay motors.