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Three-phase-induction-motor

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Three-phase induction motor

Details

Inventors: Iijima, Hiroshi; Endo, Tetsuo; Miyamoto, Yukio; Okamoto, Kiyokazu;
Assignee: NEC Corporation (JP)
Primary Examiner: Budd; Mark O.
Assistant Examiner:
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen

A three-phase induction motor includes winding slots and a stator winding. The number of winding slots per pole per phase is a noninteger. The stator winding is a three-phase balanced winding. A pitch s of the winding satisfies s=(r-t)/r or s=r/(r+t) (where t is an odd number and r is the order of a harmonic wave to be suppressed).

DETAILED DESCRIPTION It is an object of the present invention to eliminate the conventional problems described above and to provide a compact three-phase induction motor producing less torque ripple.
The three-phase induction motor according to the present invention comprises a stator having a number of winding slots per pole and phase which is a noninteger, and a stator winding as a three-phase balanced winding having a pitch s given by: s=(r-t)/r or s=r/(r+t) where r is the order of a harmonic to be eliminated, and t is an odd number .

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