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The paper describes the design and testing of a multivariable controller for a turbogenerator which takes account of the practical requirements and difficulties that arise in implementation. The controller is based on a discrete state-space model, using actual values of variables instead of deviations from defined reference levels, and incorporates output integral control on selected states. The controller regulates terminal voltage and speed regardless of changes of operating conditions or system configuration, and can drive to new operating points. It has been extensively tested on a laboratory micromachine system, and shown to give improved performance.