Motor driven air moving apparatus for high speed, constant duty

Details Motor driven air moving apparatus for high speed, constant duty Motor driven air moving apparatus for high speed, constant duty

1986-12-19

1988-08-02

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310179, 310216, H02K 524

Patent

active

047615761

ABSTRACT:
A motor driven air moving apparatus adapted to high speed, constant duty operation has a DC permanent magnet motor with a stator and rotor, one having a wound core with an even number of identically sized, evenly spaced teeth and the other having an even number of identically sized, permanent magnet poles. One of the rotor and stator has a skew at an angle from the axial, the maximum achievable skew being less than one tooth pitch due to short axial core width. A groove is provided along the midline of each of the teeth of the core which is parallel to and shallower than the tooth separating slots and contains no winding. The groove is effective to divide the tooth magnetically in half and thus decrease the effective tooth pitch, whereby, simultaneously, the magnetically induced pulsating angular velocity of the rotor and resultant audible noise are reduced and the system efficiency of the motor and air moving apparatus combination at high speeds in constant duty operation is increased.

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