Design and experimental characterisation of a linear reciprocating generator

The paper describes the design and experimental characterisation of a small reciprocating linear permanent-magnet generator which has been developed f or on-board generation of electrical power for telemetry vibration monitori ng systems. A comprehensive design methodology, which embraces both the ele ctromagnetic and mechanical design, is described. The electromagnetic desig n synthesis is based around analytical field solutions which allow the opti misation of the generator parameters, and is further verified by nonlinear electromagnetic finite-element analysis. Nonlinear structural finite-elemen t analysis is employed to aid the design of flexural disc springs with the desired stiffness and stroke. The utility of the design methodology is illu strated by a design study and extensive experimental characterisation of a prototype device.