Basic Research On Bidirectional Crosslinking Transverse Flux Permanent Magnet Synchronous Machine

Transverse flux permanent magnet synchronous motor with a special magnetic structure is easy to make the multi-pole and multi-pahse forms for low speed and high torque applications. This paper presents a bidirectional crosslinking transverse flux permanent magnet synchronous motor (BCTF-PMSM)structure, as well as analyses the motor parameters to improve the torque density using magnetic circuit and finite element method.First, a bidirectional crosslinking transverse flux permanent magnet synchronous motor is developed,which makes full use of the permanent magnet. The novel and modular stator core can be easily assembled with a low manufacture cost. The operating principle of the motor is analyzed and the equation of the no-load back EMF and torque is given. Through the establishment of three-dimensional magnetic circuit model, the mathematical model of this type motor and the compute method of inductance is given.Second, based on the magnetic circuit analysis, the main dimensions formula of the motor is derived with the analysis of the the relationship between structural parameters and the motor performance.In order to improve the torque density of the motor, the design method of the stator unit core, winding, permanent magnet is discussed.Last, the establishment of a three-dimensional finite element analysis model of the motor is used to analyze the distribution of electrical field strength, no-load back EMF, and the motor output torque, detent torque and magnetic flux leakage. Based on the analysis and simulation, a prototype model is designed and manufactured, and the experiment is done. In response to this new type of transverse flux permanent magnet motor structure, a detailed manufacturing processing of the main components of the motor is given.The experimental results agree with the simulation ones, proving the feasibility of the design method and simulations.