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The electrically commutated motor is indeed a variant of the permanent magnet motor. This type of motor utilizes permanent magnets in the rotor and relies on electronic commutation rather than mechanical brushes for switching the current in the windings.

Permanent magnet motors are known for their high efficiency and performance, chiefly due to the strong magnetic fields produced by the magnets, which allow the motor to operate effectively without the energy losses typically associated with electromagnetic field generation in other motor types.

The unique aspect of electrically commutated motors is their ability to precisely control speed and torque by modulating voltages, providing high efficiency over a wide range of operating conditions. This makes them a preferred choice in applications requiring variable speed and rapid changes in motion, such as in HVAC systems, fans, and other appliances.

Understanding that electrically commutated motors leverage the properties of permanent magnets helps clarify their operational mechanics and efficiency in comparison to other motor types, establishing their specific niche in the landscape of electric motors.