On the vast ocean，some islands and reefs are scattered and far apart from each other.The traditional energy power generation mode is facing prominent problems such as difficulties in power supply guarantee，and high operation and maintenance costs，etc.In order to fully develop renewable energy in the ocean and build a sustainable offshore energy supply system，the offshore wind power generation technology is gradually becoming a strategic choice to solve the problem of power supply in remote islands and reefs.As a new type of electromagnetic energy conversion device based on advanced magnetic field modulation theory，the permanent magnet vernier motor (PMVM) has demonstrated unique advantages in the fields of ship propulsion and offshore wind power generation due to its excellent low-speed and high torque characteristics，and is particularly suitable for use as the core power generation unit of offshore island microgrids.A multi-node magnetic circuit analytical model system is structured for tangential excitation PMVM.An accurate analytical solution for the air gap magnetic field in this structure is obtained through rigorous mathematical modeling.Based on the theory of magnetic field modulation and the principle of electromechanical energy conversion，the quantitative relationship among the core electromagnetic parameters such as air gap magnetic field，no-load back electromotive force，electromagnetic torque and armature inductance with the size of motor are systematically established.Taking into account the bilateral slotting effect，the error of the core electrical parameters is controlled within 2%.Specifically，the direct current attenuation method is used to achieve the high-precision experimental calibration of motor inductance parameters.The error between the predicted values of the analytical model and the measured data is controlled within 3%，fully verifying the effectiveness of the theoretical model.This study provides a complete theoretical analysis framework and engineering practice guidance for the rapid design and optimization of tangential excitation structure PMVM.The accuracy and engineering applicability of the analytical model are confirmed through the comparative verification of finite element simulation and prototype experiments.