Rotary electromagnetic indicator system

In a counting system having an electromagnetic decade counter with a decade counter wheel having ten equiangularly spaced, decimal count positions and a permanent magnet with a coaxial annular arrangement of an even plurality of equiangularly spaced alternating north and south salient poles, and an electromagnetic stator having a stator core with a plurality of angularly spaced salient poles providing first and second magnetic circuits respectively oriented one-half count out of phase and in phase relative to the salient poles of the counter wheel in each decimal count position thereof, and only first and second stator coil windings on the stator core adapted to be independently selectively energized in each direction for selectively magnetizing the first and second magnetic circuits respectively in each direction, and decade counter drive means for selectively energizing the first and second stator coil windings for selectively indexing the decade counter wheel to each succeeding decimal count, the decade counter drive means being operable for indexing the counter wheel to each succeeding decimal count from a prior decimal count by energizing the first stator winding in a selected direction in accordance with said prior decimal count of the counter wheel and the desired direction of rotation during a first fixed predetermined initial time portion of a predetermined fixed count cycle time interval and providing for angularly biasing the counter wheel in the desired direction of rotation from said prior decimal count and energizing the second coil in a selected direction in accordance with said prior decimal count of the counter wheel during a second fixed predetermined final time portion of said fixed time interval less than said first fixed initial time portion and providing for biasing the counter wheel in the desired direction of rotation to said succeeding decimal count.

In a counting system having a bank of a plurality of rotary electromagnetic decade counters of increasing order;

• each having a decade counter wheel with ten equiangularly spaced decimal count positions and a permanent magnet with a coaxial annular arrangement of ten equiangularly spaced alternating north and south salient poles for the ten count positions respectively, and an electromagnetic stator with a stator core with a plurality of angularly spaced salient poles providing first and second magnetic circuits in half count out of phase angularly spaced relationship, and first and second separate stator coil windings on the stator core adapted to be independently selectively energized in each direction for selectively magnetizing the first and second magnetic circuits respectively in each direction, and counter drive means for selectively energizing the first and second windings of the bank of decade counters for indexing the bank of decade counter wheels for counting, the counter drive means being operable for indexing the lowest order decade counter by selectively energizing the first and second stator windings thereof in selected predetermined directions and at fixed predetermined time intervals providing a respective plurality of individual steps of the lowest order counter wheel for each decimal count thereof for stepping the lowest order counter wheel the said plurality of individual steps in analogue form for each decimal count thereof.

A rotary electromagnetic indicating system comprising an indicating rotor with an even plurality of equiangularly spaced digital indicating positions and having a permanent magnet with an annular arrangement of an even plurality of alternating north and south salient poles for said plurality of equiangularly spaced digital indicating positions respectively, and a stator with a stator core having an annular ring generally coaxial with the indicating rotor and a plurality of angularly spaced salient poles extending radially inwardly from the annular ring within a plane generally normal to the axis of the indicating rotor, each of said salient poles being adapted to be aligned with each pole of the rotor permanent magnet as the indicating rotor is rotated through 360.degree., the stator core ring and salient poles providing first and second separate magnetic circuits in approximately one-half digit out-of-phase relationship, the first magnetic circuit having a first salient pole and at least one additional salient pole angularly spaced therefrom for respective alignment with rotor poles of opposite polarity, the second magnetic circuit having a first salient pole and at least one additional salient pole angularly spaced therefrom for respective alignment with rotor poles of opposite polarity, and first and second separate salient pole windings on said first salient poles of the first and second magnetic circuits respectively, and electromagnet drive means connected to the first and second separate windings and selectively operable for selectively digitally indexing the indicating rotor from each rest digital indicating position thereof to its succeeding digital indicating position by selectively energizing at least one of the separate salient pole windings for a controlled time interval and in a controlled direction for angularly accelerating the indicating rotor from each digital indicating position thereof toward its succeeding digital position and then decelerating the indicating rotor to a rest at its said succeeding digital position.

A resettable register for a fuel pump for registering a multiple place amount of fuel delivered and comprising a bank of decade counters having a bank of coaxial decade counter wheels of increasing place respectively each having ten equiangularly spaced decimal count positions;

• each decade counter having electromagnetic wheel indexing means for the respective decade counter wheel adapted to be selectively energized for indexing the decade counter wheel in one angular direction thereof from a prior count position to a succeeding count position;
• the electromagnetic wheel indexing means of each decade counter comprising a salient pole permanent magnet rotor, a salient pole electromagnetic stator cooperable therewith and having an annular ring generally coaxial with the rotor and a plurality of angularly spaced salient stator poles extending radially inwardly from the annular ring within a plane generally normal to the axis of the rotor, each of said salient stator poles being adapted to be aligned with each salient pole of the permanent magnet rotor as the rotor is rotated through 360.degree., and stator winding means adapted to be selectively energized through a count cycle thereof for selectively indexing the decade counter wheel in one angular direction thereof from a prior count rest position to a succeeding count rest position;
• and register drive means for selectively energizing the stator winding means of the bank of decade counters in controlled directions and for controlled time intervals for selectively indexing the bank of counter wheels for registering the amount of fuel delivered, the register drive means comprising first electronic counter means connected to be indexed for electronically registering said amount of fuel delivered, and electrical drive means for automatically selectively energizing the stator winding means of the bank of decade counters in controlled directions and for controlled time intervals for selectively indexing the bank of counter wheels for counting at a predetermined fixed rate and with each decade counter wheel at least momentarily held at rest at each count until the bank of decade counter wheels registers a count corresponding to the count of the first electronic counter means.