Abstract: A permanent magnet assembly (22) for assembly in large permanent magnet (PM) motors and generators includes a two-piece carrier (23, 24) that can be slid into a slot (13) in the rotor (10) and then secured in place using a set screw (37). The invention also provides an auxiliary carrier device (50) with guide rails (51) that line up with the teeth (12) of the rotor, so that a permanent magnet assembly (22) can be pushed first into a slot (13), and then down the slot (13) to its proper location. An auxiliary tool (50) is provided to move the permanent magnet assembly (22) into position in the slot (13) before it is secured in place. Methods of assembling and disassembling the magnet assemblies (22) in the rotor (10) are also disclosed.

Abstract: An accumulator head is convertible to alternate capacity ranges by providing a construction that has a segmented barrel with a matching ram in the purging system. More specifically, the accumulator barrel is divided into upper and lower segments so that the accumulator chamber is bounded by the lower barrel segment. The inner diameter of the lower barrel segment matches the outer diameter of the ram, and the length of the lower barrel segment corresponds roughly to the range of movement of the ram. With this accumulator construction, it is possible to change the working volume of the internal accumulator chamber by simply changing two parts, i.e., the lower barrel segment (inner diameter) and the ram (outer diameter). In addition, the two piece accumulator barrel design facilitates a more economical construction since the lower segment (where most of the wear occurs) can be made of a wear resistant grade of steel, while the upper segment can be manufactured from a lower cost, more easily machined material.

Abstract: The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced.

Abstract: A homopolar motor (10) has a field rotor (15) mounted on a frame (11) for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor (17) mounted for rotation on said frame (11) within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor (15). The two rotors (15, 17) are coupled through a 1:1 gearing mechanism (19), so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed.

Abstract: The accumulator of an extrusion blow molding machine is constructed so that the programming cylinder and die adjustment rod have axially aligned bores to receive a die pin retaining rod. The retaining rod holds the die pin in place by means of a lower split ring that nests inside the die pin and a lock nut combined with an upper split ring associated with the programming cylinder. When the lock nut is loosened and the upper split ring is removed, the retaining rod is moved down (while the die pin is held in place) and the lower split ring is removed. The die pin is then free to slide off the retaining rod and be removed from the accumulator head.

Abstract: Improved techniques and circuit arrangements are provided for generating gating signals for firing the switching devices of an inverter circuit or like power electronics generator to generate harmonics of a fundamental frequency source and for providing an adjustable phase offset between the harmonic and the fundamental signals. According to a line-frequency signal modification method, a set of line-frequency sine wave signals disposed at equidistant phase angles are generated from a multi-phase fundamental input voltage. Firing pulses are produced from the line-frequency signals by accurately detecting the points of zero-crossings for the signals and subsequently detecting the overlapping segments of similar polarity between successive line-frequency signals. Two different schemes for conveniently generating the required line-frequency sine wave signals are present. According to a digital technique, a series of logic counters are used to generate the required M-phase, Nth-order harmonic gate timing signals.

Abstract: A method and apparatus for improving the performance of polyphase AC machines. The polyphase AC machines are excited both with a fundamental frequency and with an odd harmonic of the fundamental frequency. The fundamental flux wave and the harmonic flux wave will travel at synchronous speed in the air gap. This facilitates redistributing the flux densities in the machine and thereby increasing the total flux per pole in the machine.

Abstract: An extruder screw mixing head that is adapted to be carried by an extruder screw at a downstream portion of the screw for improved distributive mixing. The mixing head includes a central body that tapers and diverges in a downstream direction to provide a progressively diminishing flow channel in an axial direction of the mixing head. Four equally spaced flights of equal pitch are provided on the outer periphery of the mixing head, and each flight has a series of peripheral recesses that are spaced from each other along the flights and that permit flow of plasticated material between adjacent flow channels defined by the spaced flights to improve homogeneity of the material. The recesses are so configured that their respective leading and trailing edges are aligned to define circumferential angles with the longitudinal axis of the mixing head, so that the inter-channel flow areas of the recesses increase in a direction toward the outlet of the extruder barrel.

Abstract: An accumulator head for an extrusion-blow molding machine. The accumulator head includes an annular inner sleeve member slidably positioned within an accumulator outer barrel, and a tubular inner body member received within the sleeve member. The sleeve member and body member are adapted to be slidable together within the accumulator barrel to expel collected plasticated material. The inner sleeve member includes a pair of external slots formed in the outer surface that communicate with the accumulator inlet and with respective radially extending flow passageways through the inner sleeve to convey plasticated material from the accumulator inlet into a pair of helical flow channels formed in the accumulator inner body member. The flow channels communicate with an outlet area to convey the plasticated material to an inner accumulation chamber through an annular collector channel and an annular flow passageway that provides an extruded parison having a uniform conformation without flow or separation lines.

Abstract: A method and apparatus for improving the performance of polyphase AC machines. The polyphase AC machines are excited both with a fundamental frequency and with an odd harmonic of the fundamental frequency. The odd harmonic flux wave is phase controlled so as to interact with otherwise waste harmonic flux waves generated by the rotor. The interaction of the harmonic flux waves enhances the pull-out torque, power factor, and efficiency of the polyphase AC machine.

Abstract: A method and apparatus for improving the performance of polyphase AC machine is provided. The machines are excited with both a fundamental frequency and with an odd harmonic of the fundamental frequency so that a fundamental flux wave and an odd harmonic flux wave travel at a synchronized speed within the air-gap of the machine. The phase angle between the fundamental and odd harmonic excitation is controlled to increase the magnetic loading of one portion of the machine, while reducing the magnetic loading of the another portion of the machine. In this manner, redistribution of the flux densities is effected to more efficiently use the various components of the machine to increase torque.

Abstract: The extruder screw has a solid feed section followed by a solid-melt transition section, followed by a melt metering section. A solid feed channel extends from the feed end of the extruder screw up to a point within the solid-melt transition section. A solid-melt channel extends longitudinally from the beginning to the end of the solid-melt transition section. A melt channel begins within the solid-melt transition section just after the end of the solid feed channel and extends longitudinally to the end of the melt metering section.