Axial gap machine phase coil having tapered conductors with increasing

Abstract

The torque produced by an electric machine of the type generally known as an axial air gap motor or generator is increased by using nonuniform conductor wires in the stator phase coils in the areas of the coil where the conductor wires extend radially outwardly from and where they extend radially inwardly toward the center of rotation, i.e. that portion of the coil regarded as the active sectors of the coil. The tapered conductor wires enable the total number of wires employed in a phase coil to be doubled by determining the number of wires that can be used at the median radius of the coil rather than at the inner radius. The tapered conductor extends to cover a greater area within the bounds of the coil. With the tapered width designed to extend and increase radially outwardly from the center of rotation, essentially all the surface area within the windings of the coil can be covered by the conductor wires. Only the insulation areas between the wires is not covered by the conductor wires. Tapered conductor wires increase the 'fill factor' and reduce degradation in the torque due to the magnetic field not being crossed by conductors carrying current. By overlapping and splitting the coils into sections and securing the facing coil sections with impervious rings and baffles, a cooling fluid passage is formed between the stator coil sections.