Abstract: A control system for regulating electrical power input to the refrigeration mechanism or defrost mechanism in an atmospheric cooling apparatus, including domestic refrigeration appliances, is provided which employs at least one piezoceramic relay device. The electrical power is applied with the piezoceramic relay device responsive to control signals and with the control circuitry being directly and ohmically connected to the power source. In one embodiment, the control means employs individual piezoceramic relay devices for power regulation to the respective mechanisms while in a different embodiment a single piezoceramic relay device regulates power input between the refrigeration mechanism and the defrost mechanism. A method of operating the controlled apparatus in such manner and a refrigeration apparatus having such control means are also disclosed.

Abstract: A method of operating apparatus to treat with a hardenable liquid adhesive material a plurality of cores each having a winding means with a pair of opposite end turn groupings thereon. An endless conveyor is operable with discrete intermittent movement to dispose a plurality of spindles for carrying the cores in a plurality of preselected indexed positions. In some of these indexed positions, the liquid adhesive material is dispensed onto the opposite end turns of the winding means on the cores carried by the spindles which are rotated while in the some preselected indexed positions.

Abstract: A terminal board for a dynamoelectric machine has a body with a pair of opposite faces. At least one terminal secured to the body includes an electrical connector section extending beyond one of the opposite faces and a deformed end section generally opposite the electrical connector section arranged in spaced apart relation with the other of the opposite face. A switch element is conductively secured to the deformed end section of the at least one terminal and extends in overlaying spaced relation with the other opposite face for switching between a set of switching modes.

Abstract: A method of assembling a dynamoelectric machine having an outboard switch compartment established at least in part by an end frame, an axially movable switch operating mechanism, and a switch assembly. In this method, the switch assembly is positioned in overlaying relation with respect to the switch operating mechanism and the end frame, and a preferred mounting height is determined for the switch assembly with respect to the switch operating mechanism and the end frame. The switch assembly is then fastened in place at the preferred mounting height.

Abstract: Apparatus and method for generating a sensing signal which is a function of a direct current flowing in a particular direction in a conductor. A core inductively coupled to the conductor is subject to negative magnetic saturation after a period of time as a result of a magnetic field generated by the direct current in the conductor. The aforesaid period of time is a function of the magnitude of the magnetic field generated by the direct current flowing in the conductor. An output winding around the core produces an output signal which is a function of the direct current in the conductor when the core is not saturated but which is not a function of the direct current in the conductor after the aforesaid period of time. A reset winding is periodically driven by a pulse to reset the magnetic orientation of the core to positive magnetic saturation before the aforesaid period of time elapses.

Abstract: A method for predeterminately sizing a core using a pair of generally opposed die means operable for compressing only an outer circumferential section of the core defined generally axially between a pair of opposite end faces of the core at least generally adjacent an outer circumferential surface thereof, respectively. A pair of sizing means are operable for disposition in confronting and predetermined radially spaced apart relation with the outer circumferential surface and a plurality of tooth tip rows defining an inner circumferential surface of the core between the opposite end faces thereof, and the outer circumferential surface and the tooth tip rows of the core are displaced generally radially inwardly thereof into sizing engagement with the sizing means thereby to effect the predetermined sizing of the inner and outer circumferential surfaces of the core in response to the compressing of only the outer circumferential section of the core by the opposed die means, respectively.

Abstract: An electronically commutated motor is disclosed including a stationary assembly having a plurality of winding stages adapted for commutation in at least one preselected sequence and a rotatable assembly having a plurality of permanent magnet elements in magnetic coupling relation with the stationary assembly. The permanent magnet elements are adapated to sequentially apply a magnetic field having a substantially constantly increasing magnetic flux to each respective winding stage during the period that current is supplied to the respective winding stage as the rotatable assembly rotates. The permanent magnet elements are also adapted to sequentially apply a magnetic field having a substantially constantly decreasing magnetic flux to each respective winding stage during a period that current is not supplied to the respective winding stage as the rotatable assembly rotates. A rotatable assembly, a method of operating the motor, and a method of rotating the rotatable assembly are also disclosed.

Abstract: A fan motor assembly provides axial air flow. A rotatable assembly including a substantially cylindric central portion supported for rotation about an axis coaxial with said central portion. The central portion has at least one permanent magnet element which rotates about the axis as the central portion rotates. The rotatable assembly further includes fan blades on an annular wall of the central portion and extending radially outwardly from the central portion. The annular wall and the central portion form an annular channel. The blades axially move air which is located about the outer periphery of the rotatable assembly as the rotatable assembly rotates. A stationary assembly includes a support for an annular core having a central opening to receive the central portion and having winding stages thereon in magnetic coupling relation with the permanent magnet element and electrically energized to generate an electromagnetic field, the core received within the annular channel of the rotatable assembly.

Abstract: A core for a dynamoelectric machine has a stack of generally thin ferromagnetic material. The stack includes a pair of opposite end faces, a pair of generally radially spaced apart circumferential surfaces interposed between the opposite end faces, and a deformed circumferential section between the opposite end faces and at least generally adjacent one of the circumferential surfaces and defining a generally annular beveled surface on at least one of the opposite end faces.

Abstract: A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.

Abstract: An electronically commutated motor has substantially constant air gap energy to reduce cogging. A rotatable assembly has permanent magnet elements which rotate about an axis of rotation. The elements are oriented with respect to said axis of rotation to provide a magnetic field with lines of flux along a plane forming a skew angle of s.sub.1 mechanical degrees with respect to the axis of rotation, wherein s.sub.1 is not equal to zero. The elements may be provided with an unmagnetized portion referred to as a phantom skew. A stationary assembly is in magnetic coupling relation with the permanent magnet elements of the rotatable assembly and has t spaced teeth with adjacent teeth defining a slot therebetween, wherein t is positive integer. Each tooth has a surface adjacent the rotatable assembly having one or more notches forming a skew angle of s.sub.2 mechanical degrees with the axis of rotation. Each tooth has winding stages adapted for commutation in at least one preselected sequence.

Abstract: A central device has a housing and snap action means for discrete snap action movement between a stable configuration and an unstable configuration thereof. Means is provided in the housing for seating the snap action means, and means is also provided for urging the snap action means from the seating means. Force transmitting means is operable generally for initially moving the snap action means into seating engagement with the seating means and for thereafter effecting the discrete snap action movement of the snap action means from the stable configuration toward the unstable configuration thereof.

Abstract: A switch and terminal assembly has a casing, and a plurality of terminals are associated with the casing with some of the terminals defining switch terminals extending both interiorly and exteriorly of the casing, respectively. A pair of switch elements associated with the switch terminals interiorly of the casing are operable generally for switching between a pair of switching modes. A pair of actuators pivotally movable in the casing are operable generally for effecting the operation of the switch elements between the switching modes thereof and include a pair of levers extending exteriorly of the casing for receiving an applied force to effect the pivotal movement of the actuators and the operation thereby of the switch elements respectively.

Abstract: A core for a dynamoelectric machine has a pair of generally opposite end faces, and wall means is provided in the core for defining at least one winding receiving slot intersecting the opposite end faces, respectively. At least a pair of layers of generally thin dielectric material are associated in overlaying relation and disposed in the slot. A set of apertures are arranged in a preselected pattern in the layers and disposed in non-aligning relation, and a set of non-apertured sections in the layers are arranged in the layer between the apertures, respectively. At least some of the apertures in each layer are communicated with at least some of the non-aperture sections in an adjacent layer, and the at least some apertures in one of the layers is also communicated with the wall means of the at least one slot.A method of assembling a core, a method of treating a core, and a method of assembling a slot liner are also disclosed.

Abstract: A method of assembling an electronic transducer having a dielectric casing member, a strain gauge, a metallic casing member including at least one wall in part defining an integral flexible diaphragm, and an electronic device including a plurality of solid state components. In this method, the strain gauge is bonded to the at least one wall spanning across the diaphragm so as to be at least in part conjointly flexible with the diaphragm. The electronic device is disposed in superposed spaced apart relation and in circuit relation with the strain gauge, and the strain gauge and the electronic device are enclosed between the dielectric casing member and the metallic casing member.

Abstract: A method of operating an electric circuit controlling device with the device having a housing, a seat in the housing, and a snap action member having discrete snap action movement between a stable configuration and an unstable configuration. The snap action member in its stable configuration is moved from a preselected position displaced from the housing seat into engagement therewith, and the discrete snap action movement of the snap action member from the stable configuration toward the unstable configuration thereof is effected when the snap action means is engaged with the housing seat.

Abstract: Apparatus for forming edgewise wound cores from a generally thin strip of ferromagnetic material has a mechanism for edgewise deforming the strip into a plurality of helical convolutions which are received in an axial stack thereof on an arbor. The arbor is movable through an opening in a carriage to deposit the axial stack on the carriage, and the axial stack is displaced from the carriage onto a conveyor when the carriage is moved into a position remote from the arbor and adjacent the conveyor.

Abstract: A method of forming an edgewise wound core from a lanced strip of generally thin ferromagnetic material having a yoke section, a plurality of teeth extending generally laterally from the yoke section on a plurality of preselected pitch axes, and a plurality of arcuate edges intersecting with each other on the yoke section facing generally opposite the teeth. In practicing this method, the lanced strip is deformed into a plurality of helical convolutions, and the helical convolutions are accumulated in a generally axial stack with the arcuate edges and teeth extending generally radially outwardly and inwardly of the stack. The teeth and the arcuate edges are respectively aligned generally in axial row formations thereof across the stack, and the teeth and the intersections between adjacent ones of the arcuate edges are disposed generally in radial alignment with each other on the pitch axes of the teeth, respectively.

Abstract: A method for forming an edgewise wound core from a lanced strip of generally thin ferromagnetic material. The lanced strip includes a pair of sets of segments extending generally lengthwise thereof with the segments of one of the segment sets being integrally interposed between the segments of the other of the segment sets, and a set of salient pole teeth are integral with the segments of the one segment set extending generally laterally therefrom. In practicing this method, successive segments of the other segment set are successively and independently edgewise constrained, and the salient pole teeth and segments of the one segment set are unconstrained. Only the edgewise constrained segments of the other segment set are edgewise deformed, and the unconstrained salient pole teeth and segments of the one segment set are maintained in their original lanced configurations.A method of operating apparatus for continuously forming edgewise wound cores is also disclosed.