Reliability and Lifetime Analysis on Permanent Magnet Motors in Elevator: Case Study PMA-SynRM & IPMSM

Nowadays, Permanent Magnet (PM) motors are taken into attention and are widely used in various systems with high-efficiency concerns. In elevator systems, a direct connection is between fault tolerability and human lives, so reliability and lifetime management are significant concerns. The electric motor is the core of traction in the elevator. Although Induction Motors (IMs) are used more in the elevator, PM motors can be a suitable alternative due to their higher efficiency, control-ability, and power density. Accordingly, in this study two types of PM motors, Interior Permanent Magnet Synchronous Motor (IPMSM) and PM-Assisted Synchronous Reluctance Motor (PMA-SynRM) are regarded and analyzed to use in the elevator system. After specifying a satisfactory assessment modeling, their significant failure modes are investigated as lifetime analysis. In order to identify the reliability status of the above motors under faulty conditions, reliability criteria are appropriately chosen. Based on the reliability statuses, the Markov chains will be yielded, and the reliability study gives Mean Time to Failure as a metric for lifetime estimation. Finally, the best PM motor from a reliability view is suggested for elevator usage as a guide for engineering.