Research on Cooling Problem of a Modular Permanent Magnet Synchronous Machine Based on a 3D Equivalent Thermal Network Method

Abstract

Due to the huge volume of gearless ball mill direct drive permanent magnet synchronous machine (PMSM), the unwinding modular technology is convenient for its redundant power control, manufacture and maintenance. Several module units are wrapped around the ball mill roller for direct drive. The motor frame adopts a modular structure to achieve complete decoupling between modules. And the cooling problem of the motor is very important for its stable operation. The traditional waterway structure design and cooling analysis methods are difficult to meet the engineering requirements of large modular permanent magnet synchronous machine (MPMSM). A 3D equivalent thermal network method is proposed to study the cooling problem of MPMSM. The design program of modular frame cooling structure is written based on a 3D equivalent thermal network method. According to the temperature distribution of each node, the cyclic check is carried out to quickly design the modular waterway. The cooling effect of the designed waterway structure is analyzed by fluid-solid coupled temperature field simulation. An 80kW prototype is developed and the temperature rise experiment is carried out. The simulation and experiment results prove the rationality of the 3D equivalent thermal network method for MPMSM cooling structure design.INDEX TERMS MPMSM, module decoupling, modular frame cooling structure, 3D equivalent thermal network, fluid-solid coupled temperature field

Performance Study of High-Speed Permanent Magnet Synchronous Motor with Amorphous Alloy Considering Temperature Effect

“…Moreover, the current research on the thermal simulation analysis of the motor is more focused on the motor simulation accuracy. For example, a 3D thermal network simulation model was proposed in the literature [18], and compared with the fluid-structure coupling finite element model, it was found that the errors of the proposed 3D thermal simulation model at the windings and stator cores were significantly smaller than those of the fluid-structure coupling model. But the error at the frame was much larger.…”