Patent ID: 9077219
Filing Date: 2015-07-07
Classification: H02K,Y10T

Abstract:
1. An electromechanical limited rotation rotary actuator comprising: a stator having an oval shaped aperture extending axially therein and at least two teeth having arcuate end portions forming at least a portion of the aperture, wherein a long axis of the oval shaped aperture is aligned with a longitudinal axis of opposing teeth; a rotor having a shaft and at least one diametral magnetized magnet operable in a limited bidirectional rotation with the stator and extending into the aperture thereof, wherein the at least one diametral magnetized magnet includes flux lines generally extending in one direction therethrough, resulting in a sinusoidal flux versus angle profile with respect to the magnet, and wherein a non-uniform gap is formed between the at least one diametral magnetized magnet and the arcuate end portions of the teeth, and wherein the shape of the gap provides a restoration torque resulting in a spring-like return-to-center action of the rotor; and an electrical coil extending around at least a portion of one tooth of the at least two teeth, wherein the electrical coil is excitable for magnetizing the tooth and providing bidirectional torque to the rotor having a generally linear mechanical angle of rotation of the rotor shaft versus input voltage profile when current is applied to the electrical coil.