Abstract: A self-draining solar collector system includes one or more solar collector assemblies, a manifold connecting assembly, and a crossover connecting assembly. Each solar collector assembly includes a collector support subsystem, one or more heating pipes, and one or more parabolic reflectors. The manifold connecting assembly connects the heating pipes of each solar collector assembly to a manifold disposed at a lower elevation than the heating pipes of the solar collector assemblies when the solar collector assemblies are oriented in respective draining positions. The crossover connecting assembly connects the heating pipes of each solar collector assembly to a crossover pipe disposed at a higher elevation than the heating pipes of the solar collector assemblies when the solar collector assemblies are oriented in their respective draining positions.

Abstract: A radial flux permanent magnet AC motor/generator employs a flat circular stator plate having a plurality of separately-formed electromagnets mounted in a ring pattern on a top surface thereof. A circular flux ring fabricated of powdered metal is mounted to the stator plate outside the ring of electromagnets. A plurality of permanent magnets are mounted in a ring pattern on the outer cylindrical surface of a steel rotor. The stator plate and rotor are axially and diametrically aligned such that the ring of permanent magnets rotates in close proximity to and inside the ring of electromagnets. The electromagnets utilize powder metal cores shaped to have rounded corners and flat sides that permit the use of heavier gauge windings and eliminate the air gaps that exist between the core and windings of prior art electromagnets.