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An improved, brushless, slot-less DC motor is disclosed which includes a plurality of ring shaped permanent rotor magnets affixed to the motor shaft and magnetized to have contiguous pole faces extending about the circumference thereof. A module plastic housing impregnated with powder metal particle

An improved, brushless, slot-less DC motor is disclosed which includes a plurality of ring shaped permanent rotor magnets affixed to the motor shaft and magnetized to have contiguous pole faces extending about the circumference thereof. A module plastic housing impregnated with powder metal particles is provided as a magnetic shunt to eliminate prior art ferrite-oxide laminations while assuring concentration of the rotor's magnetic flux into coils positioned in the physical air gap between the rotor and stator housing.

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[ Having thus defined the invention it is claimed:] [1.] A brushless, slotless motor comprising:a rotor having a longitudinally-extending rotatable shaft, an annular permanent magnet affixed to said shaft and rotatable therewith, said magnet having a continuous, magnetized outer cylindrical edge sur

[ Having thus defined the invention it is claimed:] [1.] A brushless, slotless motor comprising:a rotor having a longitudinally-extending rotatable shaft, an annular permanent magnet affixed to said shaft and rotatable therewith, said magnet having a continuous, magnetized outer cylindrical edge surface defining a plurality of arcuate pole faces juxtaposed one another, each pole face having a polarity opposite that of an adjacent, juxtaposed pole face so as to generate high-intensity, substantially unidirectional magnetic field lines at said pole faces;a plurality of coils corresponding in number to said plurality of pole faces and formed in a cylindrical array coaxial with and spaced radially outward from said cylindrical edge surface but closely juxtaposed thereto without any intervening ferromagnetic material between said coils, each coil having electrical conductors formed in an array of a predetermined number of turns and including at least two parallel sides with centerlines arranged generally parallel to said shaft;each pole face having a circumferential dimension and each coil having a circumferential dimension between said parallel sides of about two-thirds the circumferential dimension of said pole face;a housing surrounding said coils and rotor;commutation sensing means for detecting the magnitude and polarity of the magnetic field produced by said magnet; andcontrol means for providing power to selected coils in response to said sensing means.