Abstract: A power tool includes a motor having a stator assembly and a rotor pivotably arranged inside the stator. The stator assembly includes a lamination stack defining a plurality of poles; a plurality of field windings each arranged at at least two opposite poles of said plurality of poles and connected together around the stator assembly; and a plurality of conductive terminals longitudinally arranged along an outer surface of the lamination stack and electrically coupled to the plurality of field windings and a power source.

Abstract: A power tool is provided, including a housing, a permanent magnet electric motor in the housing, and an output member coupled to the electric motor. The electric motor includes a rotor and a stator. The stator includes a lamination stack of identically-shaped laminations with a North pole and a South pole. The stator also includes an end cap arranged at one end of the lamination stack. The end cap includes a polarity keying feature in an outer surface therein at a predetermined position with respect to one of the North pole or the South pole to identify a polarity of the stator.

Abstract: A power tool is provided, including a housing, a permanent magnet electric motor in the housing, and an output member coupled to the electric motor. The electric motor includes a rotor and a stator with at least a North pole and a South pole. The stator includes a lamination stack of identically-shaped magnetically-conductive laminations with the identically-shaped pockets stamped therein and secured together in alignment to form the at least one magnet pocket at each pole. Each magnet pocket is contained within the lamination stack distanced from the inner and outer surfaces of the lamination stack. The stator further including at least one permanent magnet embedded within each magnet pocket of each pole.

Abstract: A power tool is provided, including a housing, a permanent magnet electric motor in the housing, and an output member coupled to the electric motor. The electric motor includes a rotor and a stator with at least a North pole and a South pole. The stator includes a lamination stack having loose laminations held together via an overmolded resin. The overmolded resin include a longitudinal overmold layer covering at least a portion of at least one of an inner or outer surfaces of the lamination stack, and two end cap portions extending laterally from the ends of the longitudinal overmold layer to firmly cover ends of the lamination stack.

Abstract: A permanent magnet electric motor has a stator and a rotor. The stator has a stator housing with at least a North pole and a South pole, each pole including permanent magnets affixed to an inner surface of the stator housing, where at least two of the magnets within a pole have dissimilar characteristics, e.g., different widths or different grades of demagnetization resistance.

Abstract: A permanent magnet electric motor has a stator and a rotor. The stator has a stator housing with at least a North pole and a South pole. Each pole includes at least two permanent magnets arranged on an inner surface of the stator housing near the pole tips and an overmold of magnetic material molded around the permanent magnets and over the inner surface of the stator between the permanent magnets. Alternatively, an overmold of magnetic material may be provided over an inner surface of the stator, where the thickness of the overmold layer is greater near tips of each pole than in the middle portion of each pole.

Abstract: We have discovered that exposure of a photoresist on a photomask substrate to a vacuum after the photoresist has been exposed to imaging radiation results in improved critical dimension uniformity of the developed photoresist. Exposure of the imaged photoresist to vacuum is performed for a period of time sufficient to allow pattern critical dimensions to reach equilibrium across the photoresist. The vacuum treatment process of the invention is typically performed prior to the performance of a post-exposure bake process and prior to development of the photoresist. We have also discovered that exposure of a photoresist on a photomask substrate to a vacuum after the photoresist has been developed results in an improvement in the line edge roughness of pattern openings that have been formed through the photoresist layer thickness.

Abstract: An electric guitar has an electromagnetic resonating unit (3) which is arranged to resonate the strings (2) of the guitar, either individually or together. The resonance of each string is picked up by a pick-up unit (4), and the frequency of resonation of the string is detected and compared with a desired value. A tension adjusting unit (5) adjusts the tension in each string (2) until the frequency of resonance of the string correponds to the desired frequency, in order to tune the guitar to a desired tuning pattern. A control panel (6) on the body (1) of the guitar displays optional tuning patterns which may be selected by a user. Automatic tuning of the guitar may be achieved, without requiring the strings to be plucked manually.