Three-phase induction motor

Details Three-phase induction motor Three-phase induction motor

1987-03-27

1989-09-19

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310180, 310261, H02K 1700

Patent

active

048684384

ABSTRACT:
A three-phase induction motor is subjected to countermeasure for the rotor and the stator in order to remove two harmonic components of the orders causing a torque ripple, among a plurality of harmonic components included in a magnetic flux generated in an air gap between a stator core and a rotor core. In the three-phase induction motor, conductor grooves of the rotor core are skewed by an electrical angle of 2.pi.
where n is the order of one of the harmonic components to be removed. In the stator, the number of slots (N) is selected so that an equation N=l.times.m.times.q is satisfied, where l=the number of poles, m=the number of phase, and q is a non integer number representing the number of slots per pole per phase, and the stator winding pitch is determined according to the order of another harmonic component to be removed.

REFERENCES:
patent: 3515919 (1970-06-01), Houtman
patent: 3979618 (1976-09-01), Auinger
patent: 4127787 (1978-11-01), Auinger
patent: 4163915 (1979-08-01), Fong
patent: 4371802 (1983-02-01), Morrill
patent: 4629916 (1986-12-01), Oudet
patent: 4755702 (1988-07-01), Lijima et al.

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