<p>In this paper, the open circuit magnetic field of the V-shaped IPM machine is predicted by the hybrid subdomain and magnetic circuit model. The analytical calculation procedure consists of the following steps. First, the machine structure model is divided into several regions, including rotor slot, magnetic barrier, air gap, stator slot and stator slot opening. The air gap, stator slot and stator slot opening are further transformed into the subdomains with the required shape. The magnetic barriers in rotor rib are modelled by two fan-shaped subdomains. Besides, the effect of magnetic barrier between rotor slots is modelled by adding current sheets based on magnetic circuit method. Moreover, the rotor slots are divided into several fan-shaped subdomains by an effective shape equivalent method. Then the interface conditions of each subdomain are derived based on an innovative function transformation method. Finally, the vector potential solutions of all subdomains can be derived, and hence, the machine magnetic field is predicted. The open circuit magnetic field of a 6p/36s V-shaped IPM machine is analyzed by the proposed model. And the effectiveness of this model is verified by making comparison with the FEM simulation and experiment results.</p>