Research On Vernier Hybrid Machine System Based On Magnetic Field Modulated Theory

In industrial manufacture, motors with mechanical speed change mechanism are mostly adopted to get low-speed and high-torque driving device at present. Under this drive mode, the system can attain high torque, but it has many shortcomings such as mechanical fatigue, friction loss, vibration noise and reliability ect. In some circumstance of large load fluctuation, it is difficult to achieve the ideal working state.During the recent years, vernier hybrid machine based on magnetic field modulation is proposed, which gives a new thought for solving the problems. Compared with the the traditional mechanical drive device, it has obvious advantages such as low noise, maintenance free, firm structure and steady performance. With low-speed and high-torque output, vernier hybrid machine has broad application prospects such as electric vehicles, wind power generation, marine drives and other fields.Firstly, this paper briefly introduces the background and significance of the magnetic gear equipment and discusses the structure, characteristics and evolution of several common electromagnetic device, finally educing high-performance vernier hybrid machine. The vernier hybrid machine based on the principle of magnetic field modulation is researched on the following aspects in the paper.The basic topology and parameters of the verinier hybrid machine is generally introduced in the paper. Mathematical model of vernier hybrid machine is established by analytical method, introducing magnetic field modulated theory. The magnetic field of different topologies vernier hybrid machine is researched with finite element method, and the magnetic field distribution is calculated. Then flux, EMF and torque are obtained. Comparing the results, the optimal topology of vernier hybrid machine is obtained. The magnetic field modulated theory of vernier hybrid machine is further described. In addition, the effects of different permanent magnet and winding arrangements on the performance of the vernier hybrid machine are compared and analyzed in this paper.Because of the magnetic field’s complexity and special operating principle, it is difficult to calculate the magnetic field of verinier hybrid machine by analytical method. Analytical model of verinier hybrid machine is obtained with the subdomain method. In the method, the whole domain is divided into several subdomains based on the geometric configuration and the magnetic and electrical properties, and partial different equation in all subdomains is built. Based on the method of separation of variables and boundary conditions where the magnetic vector potential and tangential component of magnetic field intensity is continuous, the magnetic vector potential is obtained.Then the flux density, flux linkage and torque are calculated. Finite element model of verinier hybrid machine is obtained based on FEM software. Then the electromagnetic performance analysis is obtained. The finite element results are well fitted to the analytical results, so the accuracy of the analytical model is verified. At the same time, the comparative analysis of the effects of different rotor groove width and depth provide the basis for optimizing the design veriner hybrid machine.Finally, the prototype motor is produced and the no-load test of prototype is done. In order to facilitate the prototype test, three sets of different forms of windings are placed in the prototype stator. In the test, the data is collected by oscilloscope. At last, the simulation results are consistent with experimental data. The results show the analysis method of the vernier hybrid machine is reasonable.