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) is provided. The EMA may comprise a ball nut having an annular geometry centered about an axis. A dual ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The dual ball screw may also be mechanically coupled to the ball nut. A ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The ball screw may also be mechanically coupled to the dual ball screw.

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: 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 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: The present disclosure provides an electromechanical actuator comprising an actuator drive unit housing, a relief formed in the actuator drive unit housing, a column defined by the relief positioned adjacent to a second relief, and a load cell comprising the column and a strain gauge coupled to the column.

Abstract: The present disclosure provides an actuator assembly having a ball nut comprising a helical track and a ball screw. The ball screw of the actuator assembly includes a first translation bearing track having a first diameter, wherein the helical track and the first translation bearing track form a first translation bearing raceway in which a first translation bearing ball is disposed. The ball screw further includes a second translation bearing track having a second diameter, wherein the helical track and the second translation bearing track form a second translation bearing raceway in which a second translation bearing ball is disposed. The first diameter and the second diameter are not equal.

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: 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: An electromechanical actuator (EMA) is disclosed. The EMA may comprise an EMA housing, a ball nut extending axially within the EMA housing, a ball screw extending axially within the ball nut, and/or an actuator drive unit (ADU) housing extending axially within the ball screw, the ADU housing having a proximal stop that extends radially outward of the ADU housing. The ball nut may be configured to translate axially in a proximal direction in response to a rotation by the ball screw, and the ball nut may be configured to be halted in the axially proximal translation in response to contact with the proximal stop. The proximal stop may be coupled to the ADU housing. The proximal stop may comprise a continuous annular structure.

Abstract: A ballscrew assembly may comprise a ballscrew having an axially distributed ballscrew groove about an interior circumference of the ballscrew, an extended top plate having an axially distributed extended top plate groove disposed on an outer circumference of the extended top plate, and an axially distributed thrust bearing. Further, a ballnut assembly may comprise a ballnut having an axially distributed ballnut groove about an interior circumference of the ballnut, an extended top plate having an axially distributed extended top plate groove disposed on an outer circumference of the extended top plate, and an axially distributed thrust bearing. Further still, a ballnut assembly may comprise a ballnut having an axially distributed ballnut groove about an outer circumference of the ballnut, an extended top plate having an axially distributed extended top plate groove disposed on an interior circumference of the extended top plate and an axially distributed thrust bearing.

Abstract: The present disclosure provides an actuator assembly comprising a ballnut having a helical track, an actuator drive unit (“ADU”) housing having an ADU track, and a ballscrew. In various embodiments, the ballscrew comprises a first translation bearing track, wherein the helical track and the first translation bearing track form a first translation bearing raceway in which a plurality of first translation bearing balls having a first diameter are disposed, and a second translation bearing track, wherein the helical track and the second translation bearing track form a second translation bearing raceway in which a plurality of second translation bearing balls having a second diameter are disposed, wherein the first diameter and the second diameter are not equal.

Abstract: A method of sensor wire count reduction including receiving, from a sensor array comprising a first sensor, a second sensor, the third sensor, a first binary indication of sensor state for the first sensor a second binary indication of sensor state for the second sensor, and a third binary indication of sensor state for the third sensor. The method further includes setting a first voltage in response to the first binary indication of sensor state for the first sensor and the second binary indication of sensor state for the second sensor, determining a first indication comprising whether the fist voltage is within a first range, determining a second indication comprising whether the first voltage is within a second range, and determining a third indication comprising whether the first voltage is within a third range.

Abstract: The present disclosure provides devices and methods related to park brake systems and methods. In various embodiments, a park brake system may comprise a motor shaft having a first diameter portion and a second diameter portion, the second diameter portion having a greater diameter than the first diameter portion. A park brake system may further comprise a spring disposed at least partially around a circumference of the motor shaft, a wire coil disposed at least partially around a circumference of a bobbin, a one-way clutch disposed at least partially within the bobbin and coaxial to the motor shaft, an annular magnet disposed coaxial to the motor shaft and distal to at least a portion of the bobbin, and a clutch release mechanism disposed coaxial to the motor shaft and around the first diameter portion.

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: The present disclosure provides an actuator assembly comprising a ballnut having a helical track, an actuator drive unit (“ADU”) housing having an ADU track, and a ballscrew. In various embodiments, the ballscrew comprises a first translation bearing track, wherein the helical track and the first translation bearing track form a first translation bearing raceway in which a plurality of first translation bearing balls having a first diameter are disposed, and a second translation bearing track, wherein the helical track and the second translation bearing track form a second translation bearing raceway in which a plurality of second translation bearing balls having a second diameter are disposed, wherein the first diameter and the second diameter are not equal.

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: An electromechanical actuator (EMA) is provided. The EMA may comprise a ball nut having an annular geometry centered about an axis. A dual ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The dual ball screw may also be mechanically coupled to the ball nut. A ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The ball screw may also be mechanically coupled to the dual ball screw.

Abstract: A sensor wire count reduction system having various features is disclosed. Signals from multiple sensors may be combined together to reduce the number of wires implemented to convey the signals to a remote location. Multiple binary sensor outputs may be represented on a single wire as a multi-level signal, and may be decoded at a remote location.

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.