[Objective] Canned permanent magnet synchronous motor (CPMSM) demonstrates excellent performance

including high efficiency and high power density. Due to its compact size

lightweight design

stable and reliable operation

and low maintenance requirements

it is widely used in precision-controlled industrial equipment such as vacuum pumps. During the vacuum pumping process

air may flow into the vacuum environment

causing the vacuum pump to operate under high load conditions and leading to CPMSM overload. [Methods] This study established a co-simulation model using Simulink and Ansys to analyze the electromagnetic and thermal fields of the motor

determining the safe operation duration and the variations in the electromagnetic field under overload conditions. Taking a 1.5 kW CPMSM as an example

different overload torque multiples were set to simulate impact loads. The one-way coupling method was used to calculate the temperature rise in the winding insulation and permanent magnets under overload conditions. [Results] The results showed that the winding insulation of the CPMSM reached its temperature limit after 516 s under 1.8 times the rated load. Continued operation beyond this limit would cause motor damage

while the permanent magnets could still function safely under this load. Therefore

the motor's safe operating time under overload was 516 s. In addition

the study revealed that after overload

regions with higher stator yoke magnetic flux density increased compared to rated load conditions

while the fundamental amplitude of the air gap flux density decreased

and the fundamental amplitude of the back electromotive force increased. After overload

motor's losses increased

while both efficiency and power factor decreased. Additionally

the torque fluctuations first decreased and then increased. [Conclusion] By establishing a simulation model

this paper provides an in-depth analysis of CPMSM's operating characteristics under overload conditions

providing a scientific basis for accurately determining the safe response time after temperature rise. The study summarizes the variations in electromagnetic performance after overloading

which is crucial for improving CPMSM performance.