| Summary: | In this second paper, the individual-machine potential energy surface is established. The constant-<inline-formula> <tex-math notation="LaTeX">$\theta _{i}$ </tex-math></inline-formula> angle surface of the machine is found in the angle space. Because the individual-machine potential energy is strictly zero in this angle surface, the constant-<inline-formula> <tex-math notation="LaTeX">$\theta _{i}$ </tex-math></inline-formula> angle surface has a significant effect on the shape of the individual-machine potential energy surface. That is, the individual-machine potential energy surface is separated by a flat land, and mountains and valleys are located on either side of this flat land. In addition, a zero-<inline-formula> <tex-math notation="LaTeX">$f_{i}$ </tex-math></inline-formula> angle surface also exists in the individual-machine potential energy surface. The individual-machine potential energy reaches a minimum or maximum at the surface. Using a scissor angle surface, the individual machine potential energy boundary that reflects the maximum individual-machine potential energy is obtained through the cut of the zero-<inline-formula> <tex-math notation="LaTeX">$f_{i}$ </tex-math></inline-formula> angle surface. The machine becomes unstable after the system trajectory goes through the individual machine potential energy boundary. In the end, key concepts and distinctive phenomena in the individual-machine studies are fully explained using the concept of individual-machine potential energy surface.
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