| 摘要 |
To eliminate rotor reaction in an induction motor, double ring coils are wound on and through the rotor core in addition to the main coils at right angles to the main coil plane. By placement of a nonmagnetic material at the center of the rotor, the flux of the stator and rotor flows in separate paths at opposite sides of the rotor core and not through the shaft, to produce a transformer (induced) m.m.f. in the double ring coils. The flux which occurs due to the current of the transformer (induced) m.m.f. of the double ring coils extends substantially into the air gap by virtue of the nonmagnetic material to abate the effect of the rotor reaction in the air gap.
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