When engineers at ATB Technologies were developing a high-performance compressor for a fuel cell vehicle, they had to deliver on stringent customer requirements. The com- pressor’s electric drive motor had to provide high torque, rapid acceleration, and a maxi- mum speed of 20,000 rpm. To meet these requirements, they chose a brushless perma- nent magnet synchronous motor (PMSM) for the design. To maximize the performance and efficiency o

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