Abstract:
A rotor for a motor includes a plurality of laminations. Each lamination includes a central opening having an outer surface. The outer surface is defined by a continuous non-circular curve. A shaft includes a cylindrical portion configured to engage the outer surface. The cylindrical portion is sized to define an interference fit between the cylindrical portion and at least a portion of the outer surface.
Abstract:
Um eine elektrische Maschine (10) mit geringem Herstellungsaufwand auch für höhere Schutzarten vorzusehen wird eine elektrische Maschine (10) vorgeschlagen mit einem aus Blechen (1) aufgebauten Stator (11) und/oder aus Blechen (1) aufgebauten Rotor (13), wobei die jeweiligen Bleche (1) zumindest eine in Umfangsrichtung betrachtet, umlaufende ineinander greifende Sicke (2) aufweisen.
Abstract:
A rotor core is formed from a stack of laminations. The core includes a plurality of generally circular laminations in a stacked formation one on top of each other. Each lamination defines an axis collinear with an axis of each other lamination in the stacked formation. The laminations each have first and second surfaces and the stack is configured to define at least one inner lamination having laminations adjacent to both its first and second sides and outer laminations having laminations adjacent to only one of its first and second sides. Each lamination has a predetermined number of circumferencially equally spaced slots that define conductor receiving regions. Each inner lamination includes at least one interlocking projection extending from one of the first and second surfaces thereof, at a predetermined radial distance from the lamination axis. Each lamination further defines at least one projection receiving region formed therein for receiving a projection from an adjacent lamination. When viewing the laminations stacks parallel to the axis, the projections are engaged in their respective projection receiving regions so as to define a staggered path of projection and receiving region engagements through the lamination stack. This staggered path configuration defines an elongated, tortuous path having a length greater than a height of the stack for eddy currents through the lamination stack, to increase impedance of an eddy current path therethrough.
Abstract:
A rotor core is formed from a stack of laminations. The core includes a plurality of generally circular laminations in a stacked formation one on top of each other. Each lamination defines an axis collinear with an axis of each other lamination in the stacked formation. The laminations each have first and second surfaces and the stack is configured to define at least one inner lamination having laminations adjacent to both its first and second sides and outer laminations having laminations adjacent to only one of its first and second sides. Each lamination has a predetermined number of circumferencially equally spaced slots that define conductor receiving regions. Each inner lamination includes at least one interlocking projection extending from one of the first and second surfaces thereof, at a predetermined radial distance from the lamination axis. Each lamination further defines at least one projection receiving region formed therein for receiving a projection from an adjacent lamination. When viewing the laminations stacks parallel to the axis, the projections are engaged in their respective projection receiving regions so as to define a staggered path of projection and receiving region engagements through the lamination stack. This staggered path configuration defines an elongated, tortuous path having a length greater than a height of the stack for eddy currents through the lamination stack, to increase impedance of an eddy current path therethrough.
Abstract:
A laminated stack (82, 116) having a lamina layer comprised of a plurality of discrete lamina segments (121, 122, 136, 138) and which may also have laminas (118, 120) which define a plurality of outer perimeter configurations. The invention provides a method and apparatus for manufacturing such stacks (116). Lamina layers (118, 120) comprising a plurality of discrete lamina segments (121, 122, 136, 138) are automatically stacked by positioning the uppermost lamina in a choke barrel (94, 148) near the lower die bed (166) surface and engaging the interlock tabs (144) of the discrete lamina segments (121, 122, 136, 138) with the interlock slots (146) of an uppermost lamina layer in the choke barrel (94, 148) prior to the complete separation of the discrete lamina segments (121, 122, 136, 138) from the remaining portion of the strip stock material (154). Each of the outer perimeter configurations has at least one common choke surface (150). The common choke surfaces (150) form, when the laminas (118, 120, 140, 134) are stacked, a choke contacting surface (150) on the outer perimeter surface of the lamina stack (116) which extends continuously in the axial direction from the top lamina (140) to the bottom lamina (118). A die assembly having selectively actuated punches (90) is used to stamp the laminas (118, 120, 134, 140) with a plurality of outer perimeter configurations and the laminas (118, 120, 134, 140) are stacked in a choke barrel (94, 148) with an alignment surface which cooperates with the common choke surface (150) and securely holds the stamped laminas in position while the stack is being formed. Rotation of the choke barel (94, 148) compensates for strip thickness variations.
Abstract:
In a radial-gap dynamoelectric machine (10), a composite stator ferromagnetic structure (18) having reduced losses is formed using thin section metallic glass or electrical steel strips (51) folded or otherwise periodically deflected on one side or another of one or more planes (55) perpendicular to the machine longitudinal axis (25) edge wound to form a ring-like magnetic structure surrounding separate stator tooth assemblies formed of traditional or thin-section sheet or powdered ferromagnetic materials. Alternative structures are described.
Abstract:
An armature core (5) for a dynamo-electric machine, comprising a multiplicity of plates made of a magnetic material and juxtaposed to form a hollow cylinder. Said plates are parallel to the rotational axis of the machine and electrically insulated, and form at one end a heat exchanger. This principle allows both smooth cores and toothed/slotted cores to be produced with a very low hysteresis loss and improved heat transfer. Said core may particularly be used in ring armatures for dynamo-electric machines.