High Speed Generator for Turbocharger Based Domestic Combined Heat and Power Unit Employing the Inverted Brayton Cycle

The development of cleaner, more efficient ways to power our homes and businesses is vital if we are to address climate change and energy security issues. This paper presents the design, construction and testing of a 1 kW, cylindrical high speed permanent magnet synchronous generator for use in a domestic combined heat and power (CHP) system, employing a turbocharger operating as a small gas turbine. High speed test results are included together with a critical speed analysis of the generator set. The suitability of the inverted Brayton turbine cycle as an operating mode for the unit's turbocharger is also discussed.