Higher Efficiency and Power Factor
These two performance characteristics provide multiple advantages. Energy requirements are reduced so basic utility costs are lower. With a 30 to 50% lower current; the wiring, switchgear, and inverter needs become smaller and less expensive.
Higher Energy Density
Use of Samarium Cobalt (SmCO) rare earth magnets allow the PM motors to become smaller than reluctance motors, often saving a whole frame size. This reduces both weight and size. Rare earth magnets with high coercive force are used to prevent the motors from demagnetizing in an over-voltage and/or over-temperature condition.
No External Power Supply for Mechanical Braking
Braking torque is produced by simply shorting the motor leads.
Precise Open-Loop Speed Control
Maintained without the expense of peripheral equipment such as tachometers, regulators or expensive closed-loop systems.
Achieved over a wide frequency range. In many cases this eliminated the need for gears or belts and pulleys.
High Reliability / Longer Life
Vari-Hertz motors, as a standard, use Class H insulation (180ºC). Because they are designed for Class B use (80ºC temperature rise), you get a better motor for your money.