DC Brushless motor

Details DC Brushless motor DC Brushless motor

1981-12-11

1983-11-22

Duggan, Don

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, H02K 700

Patent

active

044171676

ABSTRACT:
In a DC brushless motor including a rotor assembly having permanent magnets and a stator assembly having coils arranged in the magnetic field generated by the permanent magnets of the rotor assembly, with the energization of the coils being controlled so as to impart a rotational torque to the rotor assembly; the permanent magnets of the rotor assembly are flat and are attached to a rotor yoke, which can be constructed as an octagonal prism, to provide a path for the magnetic flux emanating from the magnets and to support the flat magnets so that the latter form substantially a regular polygon in cross section. The magnets can be arranged with their poles in a north-south-north-south sequence against flat side walls of the rotor yoke to provide a flux density pattern that is substantially sinusoidal. Alternatively, the flat magnets can be arranged so that magnets of like polarization are disposed on either side of selected corners of a polygonal rotor yoke, thereby providing a flux density pattern that is substantially trapezoidal or rectangular.

REFERENCES:
patent: 3296471 (1967-01-01), Cochhardt
patent: 3564306 (1971-02-01), Ott

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