STRUCTURES AND METHODS FOR CONTROLLING LOSSES IN PRINTED CIRCUIT BOARDS

摘要

The disclosure relates to printed circuit board motors and specifically to printed circuit boards used in motors and generators. Windings formed from copper on printed circuit boards have been used for purposes of forming antennas, inductors, transformers, and stators that can be incorporated in permanent magnet brushless DC (permanent magnet synchronous) machines. For energy conversion devices using modern permanent magnet materials and PCB stators, the magnetic field is not strongly confined by magnetically susceptible materials. Thus, the interaction between fields from adjacent turns in a winding, and/or windings on adjacent layers (for a multilayer configuration) may be significant. The structures disclosed hereinafter reduce the effective resistance in the windings, and therefore reduce the associated losses to achieve a reduced current density in portions of the rotating energy conversion devices. The effect of the disclosed structures is a measurable reduction in loss mechanisms as a function increasing frequency, compared to the currently available devices. These effects are significant in frequency ranges important to energy conversion processes as well as typical control strategies, for example, pulse-width modulation.

主权项

1. A stator, comprising:
a planar composite structure (PCS) comprising at least one dielectric layer and a conductive pattern on a surface of each said dielectric layer, said conductive pattern comprising; a plurality of first conductive traces, each extending radially from an inner radius to an outer radius and disposed angularly on one of the dielectric surfaces; at least one of the first conductive traces connected at its outer radius to at least one other of the first conductive traces at its outer radius by a first interconnect; wherein at least said first interconnect is bounded by an inner edge and an outer edge, and has a starting region, a transition region, an ending region, and the starting region having a first radiused inner edge section extending from the first conductive trace to the transition region, and the ending region having a second radiused inner edge section extending from the transition region to the other conductive trace; and wherein at least the first radiused inner edge section and the second radiused inner edge section are each characterized at least in part by the Corner Equation
r(θ)=rd+(rs−rd)e−(θ-θs)/α for a corner starting at θs and rs and evaluated for θ>θs, or the equivalent reflected version with
r(θ)=rd+(rs−rd)e−(θs-θ)/α for a corner evaluated with θ<θs and ending at θs and rs, and where α is a parameter adjusted according to the required physical structure of the stator.