Abstract: A method and apparatus for improving the timekeeping accuracy of a time of the use or demand of energy electronic register in an electric energy meter includes compensating for the absence of line frequency timing pulses for the period between the occurrence of a power outrage and the actuation of backup timekeeping resulting from the power supply filter capacitor discharge time. A timing counter counts minutes of line frequency timing signals by decrementing a counter which is also provided with the interval interrupt operating pulses of the electronic register such that in the absence of line frequency pulses the interval interrupt operating pulses are counted and added to electronic register timekeeping system after a power down mode of operation.

Abstract: An improved DC stabilization system is provided in an electronic digital power meter of the type utilizing current transformers to scale and isolate the power line current and an analog to digital converter to convert the meter currents to a digital signal for signal processing. An unmodulated square wave signal is provided to trigger a chopper switch which connects the current transformer to an amplifier and provides a current signal output. A feedback current from the amplifier is provided through the feedback and sense windings of the current transformer by the chopper to compensate for the effects of DC offset voltage at the input of the amplifier. The square wave is a low frequency such that its harmonics and those of the power lines are different to minimize the gain bandwidth requirements of amplifiers in the system.

Abstract: Apparatus whereby data processing units exchange information with each other through a common memory without delay caused by limiting access to the memory to one data processing unit at a time.The invention includes a pair of random access memories (RAMS); a first logic circuit controlled by one of the data processing units (DPU) and the address signals from both DPUs; first and second sets of gates controlled by the first logic circuit to allow one DPU access to one RAM while the other DPU has access to the other RAM; and a second logic circuit (or "handshake" circuitry) to coordinate operation of the DPUs so that each DPU has read/write access to one or the other of the RAMs at all times. In operation, one DPU has access to one RAM while the other DPU has access to the other RAM. At the appropriate time, as determined by the handshake logic circuitry, the DPU access is switched between RAMs.

Abstract: A digital controller for synchronous motors prevents excessive heating of squirrel cage windings during motor starting. It reduces motor excitation if the actual accrued excitation time exceeds the maximum allowable excitation time of the controlled motor. It provides for adjustment of allowable time responsive to changes in excitation voltage. The thermal characteristic of the controlled motor is automatically derived from merely a few manually entered set point values.

Abstract: An automated SCR cell test exercises each of the twelve SCRs in a dual, 3 phase, full wave SCR rectifier bridge singly to detect shorted SCRs and in pairs to detect open SCRs or faulty gate circuits.

Abstract: A brush wear indicator contact and terminal assembly having a high pressure-per-unit contactor that is formed on a first surface of the plate. A conductor for a brush wear indicator circuit is bonded to the contact plate by a high temperature resistant solder or brazing material and the contact plate is bonded to the surface of the dielectric sheet, which electrically isolates the contact from the spring when the spring is in an extended condition. By the method of the invention, a brush wear indicator contact and terminal assembly is made by adhering a sheet of dielectric material to a brush follower spring with a coating of permanently flexible adhesive, and by bonding a conductor for a brush wear indicator circuit to a contact plate having a contactor ridge on one opposite surface thereof.

Abstract: An insulated field pole coil assembly for a dynamoelectric machine characterized by including an open-weave glass tape wound in half-lapped fashion around the energizing coil of magnet wire on the pole and coated with a continuous, void-free, crack-resistant dipping compound that is supported by the strands of the tape. In the method of the invention a coil is wound with lapped open-weave tape and immersed in dipping compound which is supported by the tape strands while the compound is cured, and thereafter, to form a crack-resistant, continuous insulating coating around the coil.

Abstract: An interface circuit for use between a plurality of sensors, such as brush wear detecting sensors, and a single indicating alarm. The interface circuit is operable to transmit a signal from any or all of the sensors to actuate the alarm and latch it in its operative state until the alarm is de-energized by an operator.