Before revision: Sequence The winding phases of the 3-phase motor shall be energized in a sequence for a motor to rotate, for example the phase V shall be lagging phase U by 120°, and phase W shall be lagging the phase V (U > V > W, normal phase rotation, positive sequence).
After revision: Sequence The winding phases of the 3-phase motor must be energized in a sequence for a motor to rotate, for example the phase V lagging phase U by 120°, and phase W lagging the phase V (U > V > W, normal phase rotation, positive sequence).