4 Critical Magnet Types for BLDC/PMSM Motors

Selecting the optimal magnet for your brushless DC (BLDC) or permanent magnet synchronous motor (PMSM) requires understanding four key magnet technologies. Each offers distinct advantages in cost, performance, and operating conditions.

1. Ferrite/Ceramic Magnets: The Budget Workhorse

• Energy Density: 3.5-4 MGOe (lowest among options)

• Max Temp: 250°C (reversible losses above 150°C)

• Cost: $0.50-$2/kg (most economical)

• Key Traits:

  • Brittle but corrosion-resistant

  • Requires 3-5x more volume than rare-earth magnets for equivalent torque

  • Common in appliances and automotive auxiliary motors

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