Magnomatics have developed an ultra-light fault tolerant PDD motor for the extreme environments of a rudder flight control surface Electro-Mechanical Actuator.

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The PDD motor has a magnetic gear at its heart which provides a unique functionality - a passively resettable torque-fuse to prevent jamming on overloads. The gear action also provides for a very low inertia system

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The motor is able to deliver full load torque with a failed phase-bank and each phase bank is mechanically, magnetically and thermally isolated from each other for maximum reliability and full duplex redundancy

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