Abstract: A brushless motor includes a rotor and a stator having four slots into which electrical coils are placed. The stator may include a means for limiting cogging. The brushless motor having a high torque constant, low coil resistance, low coil inductance, and high thermal conductivity is provided.

Abstract: Embodiments of a small brushless motor include a two-pole rotor and a stator having four slots into which electrical coils are placed. Additional embodiments of a small brushless motor include a two-pole rotor and stator having eight slots into which four, six, or eight electrical coils are placed. The stator may include a means for limiting cogging. The small brushless motor having a high torque constant, low coil resistance, low coil inductance, and high thermal conductivity is provided.

Abstract: Disclosed are devices and methods for reducing resonant vibrations in impact tools. The embodiments disclosed herein include the use of certain particles positioned within an impact tool, such as a hammer, for converting the energy of vibration to heat energy resulting from collisions between the particles.

Abstract: A rotary position detector includes a housing having an inner space having a reflective element. A light source emits light rays into the inner space. A base supports a light detector assembly having a first number of toroidal-sector-shaped light sensors arranged circumferentially about a motor shaft axis, is, one “Cosine +” detector element, one “Cosine ?” detector element, one “Sine +” detector element, and one “Sine ?” detector element. A light blocker positioned between the light source and the light sensors rotates with the shaft. The light blocker includes a second number of opaque, equal-surface-area elements arrayed about the axis, the second number equal to one-half the first number. A circuit measures a signal from the detectors relating to an amount of light falling thereon, a difference related to an angular position of the motor shaft.

Abstract: A brushless motor includes a rotor and a stator having four slots into which electrical coils are placed. The stator may include a means for limiting cogging.

Abstract: A position sensor employing silicon photodiodes formed from trapezoidal chips mounted on a printed circuit board detects angular positions of a rotor shaft within a galvanometer-based optical scanner.

Abstract: A rotary position detector includes a housing having an inner space having a reflective element. A light source emits light rays into the inner space. A base supports a light detector assembly having a first number of toroidal-sector-shaped light sensors arranged circumferentially about a motor shaft axis, is, one “Cosine +” detector element, one “Cosine ?” detector element, one “Sine +” detector element, and one “Sine ?” detector element. A light blocker positioned between the light source and the light sensors rotates with the shaft. The light blocker includes a second number of opaque, equal-surface-area elements arrayed about the axis, the second number equal to one-half the first number. A circuit measures a signal from the detectors relating to an amount of light falling thereon, a difference related to an angular position of the motor shaft.

Abstract: An electromechanical rotary actuator includes a stator having teeth extending inwardly from an inner wall surface, wherein free ends of each tooth form an aperture dimensioned for receiving a rotor, the free ends forming a gap therebetween. A segmented set of electrical coils extends around each tooth, wherein each coil of the segmented set has a thickness sufficient for passing through the gap between the first and second teeth. Electrically insulating tabs extend into an opening around each tooth carrying the segmented set of coils. The tabs maintain each of the coils within the segmented set in a spaced relation to the stator. When fabricating the actuator, each of the coils are fabricated and individually placed around a tooth with each coil having a thickness and breadth for optimally packing the stator.

Abstract: A limited rotation electromechanical rotary actuator includes a stator having an opening sized to accept a rotor assembly and an electrical coil. A rotor assembly is bidirectionally operable with the stator over a limited range of rotation. The rotor assembly includes an output shaft and a two-pole magnet and a position sensor shaft, wherein the output shaft and position sensor shaft are each rigidly attached to only a portion of the magnet. The rotor assembly includes apertures for allowing an electrical coil to pass through. The electrical coil extends around the magnet on four sides and is excitable for providing bidirectional torque to the rotor.

Abstract: A position sensor employing silicon photodiodes formed from trapezoidal chips mounted on a printed circuit board detects angular positions of a rotor shaft within a galvanometer-based optical scanner.

Abstract: Embodiments of a small brushless motor include a two-pole rotor and a stator having four slots into which electrical coils are placed. Additional embodiments of a small brushless motor include a two-pole rotor and stator having eight slots into which four, six, or eight electrical coils are placed. The stator may include a means for limiting cogging. The small brushless motor having a high torque constant, low coil resistance, low coil inductance, and high thermal conductivity is provided.

Abstract: A position sensor employing silicon photodiodes formed from trapezoidal chips mounted on a printed circuit board detects angular positions of a rotor shaft within a galvanometer-based optical scanner.

Abstract: A limited rotation electromechanical rotary actuator includes a stator having an opening sized to accept a rotor assembly and an electrical coil. A rotor assembly is bidirectionally operable with the stator over a limited range of rotation. The rotor assembly includes an output shaft and a two-pole magnet and a position sensor shaft, wherein the output shaft and position sensor shaft are each rigidly attached to only a portion of the magnet. The rotor assembly includes apertures for allowing an electrical coil to pass through. The electrical coil extends around the magnet on four sides and is excitable for providing bidirectional torque to the rotor.

Abstract: An electromechanical rotary actuator includes a stator having teeth extending inwardly from an inner wall surface, wherein free ends of each tooth form an aperture dimensioned for receiving a rotor, the free ends forming a gap therebetween. A segmented set of electrical coils extends around each tooth, wherein each coil of the segmented set has a thickness sufficient for passing through the gap between the first and second teeth. Electrically insulating tabs extend into an opening around each tooth carrying the segmented set of coils. The tabs maintain each of the coils within the segmented set in a spaced relation to the stator. When fabricating the actuator, each of the coils are fabricated and individually placed around a tooth with each coil having a thickness and breadth for optimally packing the stator.

Abstract: A position sensor employing silicon photodiodes formed from trapezoidal chips mounted on a printed circuit board detects angular positions of a rotor shaft within a galvanometer-based optical scanner.

Abstract: A limited rotation electromechanical rotary actuator includes a stator having an aperture sized to accept a rotor assembly and a rectangular coil. A rotor assembly is bidirectionally operable with the stator over a limited range of rotation. The rotor assembly includes an output shaft and a two-pole magnet and a position sensor shaft, wherein the output shaft and position sensor shaft are each rigidly attached to only a portion of the magnet. The rotor assembly includes apertures for allowing an electrical coil to pass through. The electrical coil extends around the magnet on four sides and is excitable for providing bidirectional torque to the rotor.

Abstract: An electromechanical rotary actuator includes a stator having teeth extending inwardly from an inner wall surface, wherein free ends of each tooth form an aperture dimensioned for receiving a rotor, the free ends forming a gap therebetween. A segmented set of electrical coils extends around each tooth, wherein each coil of the segmented set has a thickness sufficient for passing through the gap between the first and second teeth. Electrically insulating tabs extend into an opening around each tooth carrying the segmented set of coils. The tabs maintain each of the coils within the segmented set in a spaced relation to the stator. When fabricating the actuator, each of the coils are fabricated and individually placed around a tooth with each coil having a thickness and breadth for optimally packing the stator.

Abstract: A limited rotation electromechanical rotary actuator includes a stator having an aperture sized to accept a rotor assembly and a rectangular coil. A rotor assembly is bidirectionally operable with the stator over a limited range of rotation. The rotor assembly includes an output shaft and a two-pole magnet and a position sensor shaft, wherein the output shaft and position sensor shaft are each rigidly attached to only a portion of the magnet. The rotor assembly includes apertures for allowing an electrical coil to pass through. The electrical coil extends around the magnet on four sides and is excitable for providing bidirectional torque to the rotor.

Abstract: A limited rotation electromechanical rotary actuator includes a stator having an aperture sized to accept a rotor assembly and a rectangular coil. A rotor assembly is bidirectionally operable with the stator over a limited range of rotation. The rotor assembly includes an output shaft and a two-pole magnet and a position sensor shaft, wherein the output shaft and position sensor shaft are each rigidly attached to only a portion of the magnet. The rotor assembly includes apertures for allowing an electrical coil to pass through. The electrical coil extends around the magnet on four sides and is excitable for providing bidirectional torque to the rotor.

Abstract: Disclosed are devices and methods for reducing resonant vibrations in impact tools. The embodiments disclosed herein include the use of certain particles positioned within an impact tool, such as a hammer, for converting the energy of vibration to heat energy resulting from collisions between the particles.