You're looking for information on the unified theory of electrical machines by CV Jones, specifically in PDF format and related to a solid piece. Here's what I found:
The unified theory of electrical machines, also known as the "generalized machine theory," was developed by C.V. Jones in the 1950s and 1960s. This theory provides a unified approach to understanding the behavior of various types of electrical machines, including AC and DC machines, induction machines, synchronous machines, and more. You're looking for information on the unified theory
In the context of electrical machines, a solid piece typically refers to a rotor or stator that is not laminated, but rather a solid, non-magnetic (or weakly magnetic) piece of material. including AC and DC machines
