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The eccentric magnetic harmonic gear (EMHG) utilises the change of the magnetic permeability caused by eccentric structure to achieve large torque transmission with high gear ratios. This study presents an exact EMHG analytical model based on the hyperbolic cotangent transformation method. The exact method has no truncation errors and thus it is appropriate for the analysis of magnetic fields in the EMHG with large eccentricity. Firstly, the eccentric air‐gap magnetic field distributions are obtained by modulating the concentric magnetic field distributions with the relative permeance function. Then, the air‐gap flux density of the EMHG is obtained according to the superposition of the flux density by the eccentric rotor and stator permanent magnets acting alone. Furthermore, the analytical results of the air‐gap flux density and electromagnetic torque are compared with those of the finite‐element method, which verifies the correctness and validity of the analytical model. Finally, the experimental measurements on the dual‐stage EMHG confirm the validity of the analytical prediction.

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Due to the widespread use of the inte lligent household appliances, abnormal working events of sensitive household ap pliances caused by power quality problems are increasi ng.Power qu a lity problems include voltage sag,voltage interruption, three-phase vo ltage