| 摘要 |
Twelve induction coils axially arrayed on a roller are arranged into: a first group of induction coils delta connected induction coils excited by a three-phase voltage; a second group of star-connected induction coils being successively disposed while being spaced apart in the phase rotation direction of the first group of induction coils; a third group of delta-connected induction coils being excited by a phase-shifted voltage formed by phase-shifting a three-phase voltage by 180 ° and being successively disposed while being spaced apart in the phase rotation direction of the second group of induction coils; and a fourth group of star-connected induction coils being excited by a phase-shifted voltage and being successively disposed while being spaced apart in the phase rotation direction of the third group of induction coils.
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