[Objective] Canned permanent magnet synchronous motor (CPMSM) is widely used in nuclear power

chemical

and other harsh environments due to the sealing properties of its shielding can. However

eddy current losses in the shielding can lead to significant temperature rise

adversely affecting motor performance. To mitigate these losses and thermal effects while enhancing electromagnetic performance and thermal stability

this paper systematically investigates the electromagnetic-thermal coupling effects of shielding can materials

with a focus on exploring the application potential of non-metallic ceramic materials in canned motors. [Methods] In this study

a CPMSM with rated power of 1.5 kW and a speed of 9 000 r/min was selected as the research object

and a two-dimensional finite element model was constructed

and the shielding can of three materials with different physical properties

were compared and analyzed by using the two-way coupling iterative algorithm of electromagnetic field and temperature field. The effects of physical properties of shielding can materials on the induced electromotive force

air gap magnetic density

loss

torque and efficiency of motors were studied

and their temperature distribution characteristics were deeply analyzed. [Results] The research results demonstrated that when silicon nitride (Si3N4) material was used as the motor shielding sleeve

its insulating properties effectively suppressed eddy current losses

improved motor efficiency and output torque

and increased the fundamental amplitude of the induced electromotive force by more than 11%. Compared to SUS316 and SUS430 materials

Si3N4 ensured more uniform temperature distribution and lower thermal rise in motors. Notably

permanent magnet temperatures were reduced by 30% when using Si3N4 as the shielding material compared to SUS316. [Conclusion] As a new high-performance shielding can material

Si3N4 has excellent characteristics such as electrical insulation

non-magnetism and high thermal conductivity. It can effectively suppress eddy current

optimize electromagnetic characteristics and enhance the thermal stability of motor. It has an important application prospect in the design of efficient

reliable and low loss motor.