Influence of the NdFeB Permanent Magnet on Working Characteristics of LSPMSM

Nowadays, the rapid development of neodymium rare earth (NdFeB) permanent magnet technology has promoted the creation of high-efficiency motors to replace the traditional low-efficiency induction motors (IM). In line-start permanent magnet synchronous motors (LSPMSM), the NdFeB permanent magnet acts as a source of flux. The calculation of permanent magnet depends on a large number of coefficients, which have a large range of variation and whose choice is largely dependent on experience. It is these factors that lead to the preliminary selection of the permanent magnet type, which can be inaccurate and greatly affect the working characteristics of the LSPMSM. The content of the article analyzes the influence of the selection of NdFeB permanent magnet types on starting speed characteristics, torque characteristics, current characteristics, and no-load dynamic forces in the design of an LSPMSM with a speed of 3000 rpm. Research results also show that, for each type of permanent magnet, there are some parameters or better working characteristics. Depending on the task required in the design of the LSPMSM, it is possible to select the type of permanent magnet suitable for the requirements.