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An energy storage system using a linear machine for lifting heavy mass to convert its potential energy to/from electricity has the following advantages 1) Environment friendliness; 2) Long life span; 3) Potential lower cost-to-life span ratio which tests human-beings patience to see. Such kind of system has rotor or mover and stator structure. For simplicity, the stator can take windings spreading from the bottom to top of interleaved stator structure with windings wound around it. The stator windings are formed by multiple strands of aluminium conductors in parallel to reduce ohmic losses, leading to higher efficiency. The rotor or mover is formed by multiple fundamental units which are reinforced by stainless steel or other reinforcement, each unit consisting of flat copper conductor sandwiched between magnetic materials through insulators. The copper conductor in each unit is joined at terminals either in series or in parallel. In this paper research is on the issues of having proper number of series and parallel circuits.

Issues on Series-Parallel Circuits and their Drives in the Linear Machine for Heavy Mass Energy Storage System