Abstract: A method and apparatus for exciting and controlling a switched reluctance motor having pulse duration modulated current provided to the windings of the motor. A start signal determined by a rotor position sensor, charges a capacitor. The capacitor is discharged according to an error signal that indicates the difference between a desired magnitude of a parameter, such as torque or speed, and the actual magnitude. A comparator puts out a pulse having a duration which is the same as the time that the capacitor has a charge. The pulse from the comparator turns on a switch connected to respective windings of the motor and provides a current pulse that has a duration equivalent to that of the pulse from the comparator. This sequence is repeated for all of the windings of the motor so as to maintain its speed or torque at the desired magnitude.

Abstract: A method and apparatus for proving an electronic gas meter and the like that includes counting the number of pulses provided by an encoder associated with a bell prover to define a volume of test fluid which is supplied to the meter under test, enalbing the meter to measure the volumetric fluid flow rate and integrating the volumetric flow rate of test fluid measured by the gas meter during the test, and data representing the actual volume of test fluid supplied to the meter under test to determine the percent proof or accuracy of the meter.

Abstract: An electronic compact gas meter includes a solid state flow sensor for sensing gas flow rate, data acquisition circuits including an analog-to-digital converter coupled to the sensor for controlling same and providing an output indicative of gas flow, and a digital data processor for receiving the gas flow information from the analog-to-digital converter, processing the information and registering the volumetric gas flow reading at the meter and/or transmitting the volume flow information via RF or telephone communication lines to a remote location.