Abstract: A park brake system for an electric motor actuator is provided. The system may comprise a wrap spring that may rotatably engage the shaft. In this regard, the system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.

Abstract: A vented EMA may have a vent that allows gas to pass from into and out of the vented EMA, while preventing liquid from passing into and out of the vented EMA. The vented EMA may have a desiccant material inside the vented EMA that absorbs condensation from within the vented EMA. A vented EMA may also have an air flow path that conducts gas into and out of the vent during operation. As a result, the pressure inside the vented EMA may equalize with the pressure outside the vented EMA, but the deleterious ingress of liquids may be ameliorated.

Abstract: A brushless DC motor is provided. The brushless DC motor comprises a motor housing around an axis, a stator assembly inside the motor housing, a carrier plate fixed relative to the stator assembly, and a Hall effect sensor assembly removably coupled to the carrier plate. A method of making a brushless DC motor is also provided comprising fixing a carrier plate relative to a stator assembly of a brushless DC motor assembly, and fixing a first Hall effect sensor array to the carrier plate.

Abstract: An electro-mechanical actuator in an aircraft brake may include a ball nut piston, and endcap coupled to the ball nut piston, a retaining ring coupled to the endcap, and a puck secured within the endcap. The puck may be permanently retained within the retaining ring. The retaining ring may be a split ring which is installed around a base of the puck. The puck may be inserted within a single-piece retaining ring, and the retaining ring may be bent over a base of the puck.

Abstract: A mechanical linear actuator in an aircraft brake may include a ball nut, a ball screw, and an actuator drive unit housing. The ball screw may rotate to drive the ball nut axially. The ball screw and the actuator drive unit housing may form a series of annular raceways. The ball screw may have a first window corresponding to a first raceway and a second window corresponding to a second raceway. Balls may be inserted into the first raceway through the first window and into the second raceway through the second window.

Abstract: A ballscrew assembly may include a ballnut configured to combat the negative effects of thermal expansion of dissimilar materials used within the ballscrew assembly. Moreover, the ballscrew assembly described herein may have a decreased coefficient of friction as compared with a steel on steel housing and ballnut configuration. A ballscrew assembly may comprise a ballnut made from a first material, a ballnut housing made from a second material, and a sleeve made from a third material. The sleeve may be positioned between the exterior of the ballnut and an interior of the ballnut housing to reduce friction between the exterior surface of the ballnut and an interior surface of the ballnut housing.

Abstract: A park brake system for an electric motor actuator is provided. The system may comprise a wrap spring that may rotatably engage the shaft. In this regard, the system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.

Abstract: An electro-mechanical actuator including an aircraft parking brake may include a motor shaft, a park brake disk, and a voice coil assembly. The voice coil assembly may include a bobbin configured to translate between an engaged position and a disengaged position. An engagement feature may be coupled to the bobbin. The engagement feature may contact the park brake disk in the engaged position. The engagement feature may be magnetically coupled to a voice coil magnet and washer in the disengaged position.

Abstract: The EMA may comprise an EMA housing, a strain gauge coupled to the EMA housing, the strain gauge comprising a Wheatstone bridge, the Wheatstone bridge comprising a first group of resistors coupled in parallel with a second group of resistors, a controller coupled to the strain gauge, a variable resistance resistor coupled to the Wheatstone bridge, the variable resistance resistor configured to derive a temperature of the EMA housing based upon a temperature of the variable resistance resistor and configured to provide feedback to the controller, the controller adjusting a force applied by the EMA based upon the temperature of the EMA housing.

Abstract: A park brake system for an electric motor actuator is provided. The system may comprise a micro-motor, and one or more gears. The system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.

Abstract: A park brake system for an electric motor actuator is provided. The system may comprise a micro-motor, and one or more gears. The system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.

Abstract: The EMA may comprise an EMA housing, a strain gauge coupled to the EMA housing, the strain gauge comprising a Wheatstone bridge, the Wheatstone bridge comprising a first group of resistors coupled in parallel with a second group of resistors, a controller coupled to the strain gauge, a variable resistance resistor coupled to the Wheatstone bridge, the variable resistance resistor configured to derive a temperature of the EMA housing based upon a temperature of the variable resistance resistor and configured to provide feedback to the controller, the controller adjusting a force applied by the EMA based upon the temperature of the EMA housing.

Abstract: An integrated actuator drive unit (ADU) assembly for an electric motor actuator is disclosed. The integrated ADU assembly may comprise at least one of an integrally formed ring gear, an integrally formed thrust bearing and integrally formed load cell. The integrated ADU assembly may comprise a portion of an electromechanical actuator. The electromechanical actuator may be utilized for aircraft braking systems.

Abstract: A instrumented housing for an electric motor actuator is provided. The instrumented housing may have a ribbon gage coupled to a housing of an electrical motor actuator. The ribbon gage may have one or more strain gages. The strain gages may measure the tension on the housing when the electric motor actuator exerts a load. A cover may extend over at least a portion of the housing and ribbon gage.

Abstract: A ring-shaped thrust bearing extending in an axial direction having an inner surface includes a first axial groove in the inner surface having a first flat wall and a second flat wall; and a first principal strain sensor positioned on the first flat wall of the first axial groove to measure compression in the axial direction.

Abstract: An electric braking apparatus is provided and includes an electromechanical actuator (EMA) configured to apply an axial load on a brake stack and a damping end-stop. The damping end-stop is configured to transmit torque into the EMA and includes an end cap, a screw disposed such that a longitudinal axis about which the screw is rotatable extends through the end cap, a nut threadably engaged with the screw and movable with the end cap relative to the screw with screw rotation and a spring element anchored on the end cap to resist the screw rotation beyond a predefined position.

Abstract: An electromechanical actuator (“EMA”) may comprise a ball screw having at least one tab extending from an inner surface thereof and/or an actuator drive unit (“ADU”) housing that interfaces with the at least one tab. The bail screw may include three tabs extending from the inner surface thereof. An outer surface of the ball screw may be threaded to mate with a threaded portion of an inner surface of the ADU housing, and/or the ADU housing may interface with the at least one tab, and the ball screw may be rotated to translate a ball nut situated concentrically over ball screw axially. The ADU housing may include a gear train assembly having a carrier plate, wherein the carrier plate includes at least one receptacle.

Abstract: A park brake system for an electric motor actuator is provided. The system may comprise a wrap spring that may rotatably engage the shaft. In this regard, the system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.

Abstract: An electromechanical actuator (“EMA”) comprising an actuator drive unit (“ADU”) housing and a ball screw is disclosed. The ball screw and ADU housing may interface to form a multi-row thrust bearing (MRTB). Further, the ball screw may be situated at least partially about the ADU housing, an outer surface of the ADU housing may include a first ADU raceway, and an inner surface of the ball screw may include a second inner ball screw raceway. Either or both raceways may comprise hemispherical structures.

Abstract: A park brake system for an electric motor actuator is provided. The system may comprise a micro-motor, and one or more gears. The system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.