Brushless DC motor and brushless DC motor controller

Details Brushless DC motor and brushless DC motor controller Brushless DC motor and brushless DC motor controller

2006-10-10

2006-10-10

Duda, Rina (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S434000, C318S132000, C318S629000, C318S632000, C310S156150

Reexamination Certificate

active

07119507

ABSTRACT:
A brushless DC motor has a stator and a rotor. An angle θ0between an edge section of the flux barrier on a magnetic pole center side and an edge section on a side for coming in contact with the rib of adjacent flux barrier, with respect to the rotor center, is determined to be equal to or greater than an angle satisfying a following relationshipin-line-formulae description="In-line Formulae" end="lead"?θ0=180°*m/(Pn*f/f0) (provided 2θ0−θr<90°)in-line-formulae description="In-line Formulae" end="tail"?wherein, a frequency of vibration which is to be reduced is represented with f, a pole pair number is represented with Pn, an electrical frequency is represented with f0=Pn*N, a motor revolution is represented with N, m=1, 3, 5, . . . , an angle of the rib with respect to the rotor center is represented with θr, therefore making of motor highly effective and decreasing of the motor acoustic noise are coped with.

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