The windings in a 3 step motor, as soon as activated by a 3 phase supply develop a rotating magnetic field in the rotor area that the motor. Swapping step A with phase B re-orders the fluxes so the the flux rotates in opposing direction. Swapping B through C does precisely the exact same thing as does swapping A through C. Think the it like a triangle with corners called A, B and also C. If you swap any two corners and follow the points A, B and also C you"ll go in anopposite direction. Swap two much more corners and also you"re back to the initial rotation.
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This is what that looks like. The black arrowhead is the flux produced by the three phase windings: -
Clearly, if yellow phase were swapped through blue phase the rotation would certainly be opposite.
Each phase has actually the very same voltage in a sinewave, however 120 degrees out that phase. The inquiry then becomes which phase leader the other. This is what determines the direction the the motor.
The phases have a phase change of 120 degress - dubbed electrical step angle, at the same time the windings ~ above the engine are also shifted by 120 deg - mechanical angle. In a together way, once the existing passes trough windings the rotating magnetic ar is formed, i beg your pardon is the sum of all three vectors. This is the principle of induction motor that Nikola Tesla do 130 yrs ago.
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If you merely swap two wires, the magnetic fieled alters the direction that rotation.
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