Abstract
Permanent-magnet (PM) direct-drive radial-axial flow turbine generator is widely used in the field of low-grade waste heat (below 200 °) Organic Rankine Cycle (ORC) power generation. However, special mechanical balance devices are needed to suppress the axial force produced by radial-axial turbine under the high-speed operation, resulting in not only the complex structure of the generator, but also higher cost and loss. Aiming at solving the above mentioned problems, a conical-rotor PM generator is proposed in this paper. The mathematical model of the generator is established to calculate the axial magnetic force. The effects of the air gap and cone angle of the conical-rotor PM generator on the axial force are analyzed theoretically. Moreover, a parametric design is conducted to optimize the axial force produced by the conical-rotor PM generator, which may balance with the axial force caused by the turbine. A simulation on the 3D FEM model is performed to validate the correctness of the analysis.
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