Abstract: This disclosure relates to a liquid supply system including a motor-pump unit designed for installation in a liquid supply such as a well or storage tank. The unit supplies the liquid to a supply pipe, and a pressure sensor connected to the pipe is operable to provide a control signal representative of the liquid pressure in the pipe. The motor is a variable-speed AC motor. A control for the motor is responsive to the control signal and actuates a power circuit to drive the motor at a speed adjusted to maintain the liquid pressure at a substantially constant value. The control circuit further includes means for turning off the power to the motor in the absence of flow through pipe, which does not require a flow sensor. The power circuit comprises a DC link including a rectifier and an inverter. The rectifier is located adjacent the pressure sensor; the inverter may be located adjacent the rectifier and the pressure sensor or in the casing of the motor-pump unit.

Abstract: This disclosure relates to a power supply circuit for converting AC energy from an AC source to DC energy for powering a load. The circuit comprises first and second circuit lines and a full wave rectifier connectable to the AC source and to the circuit lines for providing a rectified input voltage on the circuit lines. An inductor is connected in one of the circuit lines and an output capacitor is connected across the circuit lines between the inductor and the load. A control switch including two power terminals and a control terminal has the two power terminals connected across the circuit lines between the inductor and the output capacitor. A sensor responsive to current flow through the inductor provides a current representative signal. A relatively high fixed frequency oscillator closes the control switch in each cycle thereof.

Abstract: A device for measuring energy delivered by a motor to a load is adapted to be connected to the motor which is coupled to the load and connected to a power source through first and second power supply lines. The device includes a line voltage sensing circuit for sensing the voltage across the power supply lines, a line current sensing circuit for sensing the current flowing through the motor and a pulse width modulator which modulates the sensed voltage to produce a pulse width modulated first electrical signal. The device also includes a first switch, responsive to the pulse width modulated first electrical signal which modulates an output of the line current sensing circuit to produce a power waveform and an integrator which integrates the power waveform to produce an output signal indicative of the energy delivered by the motor to the load.

Abstract: A telemetry system for use with AC power lines, comprising a pulse transmitter connected to the lines for generating pulses on the power lines only in a selected portion of each full cycle of the power line voltage waveshape. The system further comprises a pulse receiver including first means for counting pulses in the selected portion and second means for counting pulses in another portion of each full cycle. The two counts are compared (one is subtracted from the other) over a plurality of full cycles to produce a net pulse count. Since the noise signals appear throughout the cycles and, over a sufficient number of full cycles, are present in substantially equal numbers in both portions, the subtraction of the two counts essentially eliminates the noise pulses. Any remaining pulses are those produced by the transmitter and may be processed as needed, and false tripping due to noise signals is avoided.

Abstract: This disclosure relates to a method and apparatus for assembling a rotor for a rotating electric machine, the rotor including a plurality of permanent magnet segments, and an outer sleeve or cylinder. A thin-walled metal cylinder is fashioned and arcuate magnet segments are positioned in angularly spaced relation against the interior surface of the cylinder. The segments are displaced radially outwardly to stretch or expand the outer cylinder, and the segments are then supported in the outwardly displaced positions. The segments may be displaced by a variety of devices including an expanding mandrel, a tapered part of a shaft and a tapered ring.

Abstract: A rotor comprising a rotor shaft and a rotor core on the shaft, the core being cylindrical. A number of arcuate permanent magnets are positioned at angularly spaced positions on the outer periphery of the core, and a tubular metal sleeve is positioned around the magnets. The sleeve extends beyond the axially outer ends of the magnets and the sleeve has end portions which extend radially inwardly and overlie the ends of said magnets. The sleeve has residual tension which produces a radially inwardly directed force on the magnets, and the end portions are spun or turned over and produce a force on the ends of the magnets.

Abstract: This disclosure relates to a voltage surge arrestor for use with an electric device having a component to be protected from a voltage surge. The arrestor comprises at least first and second electrodes, and a spacer connected to the electrodes and mounting the first and second electrodes in spaced relation. The electrodes have portions which are spaced relatively close to each other and form a gap therebetween, and a gravity movable member is in the space between the electrodes and movable by gravity into and out of the gap, thereby changing the voltage breakdown level in the gap. The arrestor further includes a voltage and current limiting block connected to one of the electrodes. The movable member may be electrically conductive or a dielectric member, and it may be liquid or solid.

Abstract: An underload protection system for an electric motor connected to first and second power supply lines, the lines being connectable to an AC power supply. The system comprises a line voltage sensing circuit connected to the first line and having a line voltage signal impressed therein, and an amplitude adjustment circuit connected to the voltage sensing circuit for adjusting the line voltage signal to produce an amplitude adjusted voltage signal. A line current sensing circuit is connected to the second line and has a line current signal impressed thereon, and a phase adjustment circuit is connected to the current sensing circuit for adjusting the phase of the current signal to produce a phase adjusted current signal.

Abstract: A motor comprising a stator core having stator windings wound thereon and an elongated outer shell which surrounds the core and the windings, the shell extending lengthwise beyond the end turns of the windings and supporting the motor bearings. The core is slidable in the shell but is retained in place in the lengthwise direction by first and second abutments fastened to the interior of the shell at opposite ends of the stator. At least one of the abutments is a ring which may be removed, thereby enabling easy assembly or disassembly of the motor. The core is retained against angular movement by a key which engages lengthwise extending keyways in the core and the shell. Tubular spacers are mounted between the stator core and the abutments.

Abstract: This disclosure relates to a system for stabilizing a permanent magnet synchronous motor that does not have a rotor starting cage or windings. The system includes a dc source, an inverter connected to the dc source for converting the dc to a multi-phase ac, and an ac synchronous motor connected to receive the multi-phase ac, the motor being constructed without a starting cage or winding. The system further includes means for sensing variations in the motor power angle, and a control circuit connected to respond to the variations and to cause the inverter output to vary such as to generate an ac component of torque that leads in phase the power angle variations at the natural frequency of the rotor of the motor. The inverter output may be varied by modulating the applied frequency, the dc bus current to the inverter, or the inverter phase angle.

Abstract: This disclosure relates to an electric motor control designed for attachment to a support wall or to a pressure switch. The control comprises a support having a base portion and a mounting portion. The base portion has a plurality of electrical terminals attached thereto and has at least one lead opening formed therein for electrical leads. The mounting portion has a lead opening formed therein. A motor control switch including a plurality of electrical terminals is connected to the terminals of said base portion. The mounting portion includes first means for attaching the support to a pressure switch and second means for attaching the mounting portion to a support wall. A cover is removably attached to the base portion, and the control switch is mounted in the cover.

Abstract: This disclosure relates to a mount for an electric motor, and comprises a sheet metal annular member adapted to support electric motor parts within it, a plurality of flexible sheet metal mounting lug members extending generally radially outwardly from the outer periphery of the annular member, each of said lug members including a flexible part and a mounting part that extends generally parallel to the adjacent part of said annular member, and a mechanical connection between each of the mounting parts and the annular member. Each mounting part and the adjacent part of the annular member form overlying sheets, and each mechanical connection is formed by portions of the sheets which are pierced and offset radially outwardly and form radially inner and outer bridges, the inner bridge being spread over the surface of the mounting part to interlock the parts together.Another aspect of this disclosure relates to a method of fastening flexible mounting lugs to a motor utilizing mechanical connections.

Abstract: This disclosure relates to an electrical power transfer system for matching a load to a DC source such as a solar array. The system tracks the power output of the source under varying operating conditions and matches the load to the source to maintain peak power conditions. The system senses the voltage and the current of the source, incrementally changes the volt-ampere operating point of the source and thereby changes its incremental resistance, and adjusts the load to the level where the ratio of the DC source voltage to the DC source current is substantially equal to the incremental resistance.

Abstract: This disclosure relates to a lip seal designed to seal a space between a rotatable shaft and a housing part around the shaft. The housing part is formed of relatively flat material and has a hole formed in it, through which the shaft extends. The seal includes a support band that is sized to have a tight interference fit on the shaft. Extending radially outwardly from the band are two opposed lips that form an annular groove therebetween. The seal is positioned with the housing part in the groove and the lips engaging opposite sides of the housing part. The two lips are constructed with a preload that causes them to sealingly engage the housing part when the housing part is positioned in the groove. The band rotates and makes a sealed connection with the shaft, and the two lips slide against the housing part and form seals therebetween.

Abstract: This disclosure relates to a circuit for controlling energization of a start winding of a single-phase motor connectable by power lines to an AC power supply. The circuit includes at least two triacs connected in back-to-back series relation and connected in series with the start winding. The circuit further comprises a reed switch including reed contacts and a reed coil. The gates of the two triacs are connected across the reed contacts, and the reed coil is connected in one of the power lines and receives the line current during energization of the motor.

Abstract: This disclosure relates to a control assembly, a well pumping system, the system including an electric motor driven pump and a storage tank that receives liquid from the pump. The control assembly includes a mounting plate, a pressure switch that responds to the pressure of the liquid in the tank, the pressure switch being mounted on the plate, a terminal board and a printed circuit board. The terminal board is mounted on the plate adjacent the pressure switch, and power leads are secured to connectors on the pressure switch and on the terminal board. The printed circuit board includes a start winding control switch for the electric motor, and mating quick connect terminals on the terminal and printed circuit boards connect the start winding control switch with the motor. When the motor is a capacitor-start type, a capacitor is connected in the control switch by quick connect terminals, these terminals further serving to support the capacitor on the two boards and the mounting plate.

Abstract: This apparatus is for use in measuring a weight, or force, and it is particularly useful as a scale. The apparatus includes a single vibrating wire and wire supports that rigidly clamp the two ends of the wire. A weight to be measured is applied to the wire in substantially the direction of its length, and the applied weight changes the tension in the wire. The apparatus includes a wire drive circuit that causes the wire to vibrate at essentially its natural resonant frequency. The frequency varies as a known cubic equation with respect to the applied weight, and a computer, operating in accordance with the equation, converts the measured frequency to a weight signal. The apparatus further includes vibration dampers and isolators for reducing the effects of sympathetic vibrations and of externally induced vibrations, and means to correct for external influences such as disturbing frequencies and ambient temperature.

Abstract: Apparatus for controlling the air flow from a register of a forced air heating system. The apparatus includes walls forming a housing or cover that is adapted to be fastened to and enclose an air outlet register. The walls also form an outlet opening, and a pivotable flapper valve or wall is provided that is movable to close the opening. The valve is pivotable between an open position where the opening is not closed, and a closed position where the opening is obstructed, the valve being biased to the open position. The valve is located to be subjected to the force of air moving out of the register and through the housing, this force being such as to urge the valve to the closed position. The apparatus further includes a latch for holding the valve in the open position against the force of the moving air, and an electric control for disabling the latch in the presence of the flow of air. The electric control may be manually operated or it may be responsive to the ambient temperature conditions.

Abstract: This disclosure relates to a system for processing a plurality of random weight commodity packages in a supermarket utilizing a series of labels having nonrepretitive machine readable symbols thereon. The system includes a computer-scale having a data entry unit, a central computer including a memory bank, and a symbol scanner at a checkout station. Commodity-related data including the commodity identification and the price per unit weight are entered into the entry unit, most or all of the data usually being entered manually. The computer-scale includes means for serially weighing the packages, a price computer for computing the total package cost, and a printer for printing human readable data on a label. The system further includes means for applying a machine readable code symbol to each package, the symbol being located either on the above-mentioned label or on a separate label that is also attached to the package.

Abstract: An underload protection system for an electric motor connected to first and second power supply lines, the lines being connectable to an AC power supply. The system comprises a line voltage sensing circuit connected to the first line and having a line voltage signal impressed therein, and an amplitude adjustment circuit connected to the voltage sensing circuit for adjusting the line voltage signal to produce an amplitude adjusted voltage signal. A line current sensing circuit is connected to the second line and has a line current signal impressed thereon, and a phase adjustment circuit is connected to the current sensing circuit for adjusting the phase of the current signal to produce a phase adjusted current signal.