Brushless DC motor

Details Brushless DC motor Brushless DC motor

1995-11-30

1999-04-06

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310268, 310156, 310 61, 310181, H02K 2900

Patent

active

058923071

ABSTRACT:
An improved design brushless DC motor has a rotating disk type rotor with trapezoidal shaped permanent magnets connected by a closed magnetic circuit and a stator mounted inside the motor coaxially with the rotor and also having ttrapezoidal shaped stator coils located in the magnetic field generated by the permanent magnets of the rotor. The active parts of the stator coil windings are oriented in a radial direction and are configured to have a width equal to between 0.2 and up to 0.4 of the pole pitch length with the angle between two radiuses which pass through the center of the active part of each coil equal to 360
(where "n" is the number of magnets). In addition--one or both base lines of each trapezoid is perpendicular to the disk radius and is between 0.7 and up to 0.9 of the pole pitch length. The rotor of the motor comprises three parallel disks and the stator two stator windings with each stator winding positioned between the external and internal disks. Motor cooling is provided by inlet holes in the external disks being formed at an angle oriented in the direction of disk rotation and from the disk center to the periphery thereof with housing side holes also formed at an angle in the direction of the rotor rotation.

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