Motor and control system having cyclic reversal and unidirectional capabilities

Claim 2

In a device having a member driven in at least two operation modes, one of said modes being a constant cyclic reversal movement occuring at some predetermined interval of rotational movement of said member, and the other of said modes being a continuous rotation of said member in a preselected direction, the improvement which comprises dynamoelectric system means for driving said member in each of said operational modes, said dynamoelectric system means comprising a motor including a rotating member and a stationary member, means for supplying electrical energy to the said motor, said energy supplying means including a pair of input terminals, a rectifier bridge having a negative DC terminal, said rectifier bridge being electrically connected to said input terminal pair, said energy supply means providing a first output and a second output, said first output being variable to permit selective variation of motor speed, said second output being substantially constant, said negative terminal providing a common connection point for both said first output and said second output.

Claim 3

The improvement of claim 1 wherein said bridge further comprises a pair of AC terminals and a positive terminal in addition to said negative terminal, said energy supplying means further including a triac electrically connected between one of said AC terminals and one of said input terminals for said dynamoelectric system means, and said triac including a gate elctrode, a silicon bilateral switch having first and second sides, said first side being electrically connected to said gate electrode, and a series circuit including a variable resistor and a capacitor connected between said pair of input terminals, said second side of said silicon bilateral switch being electrically connected between said variable resistor and said capacitor, said variable resistor being adapted to vary the firing angle of said triac, thereby controlling the DC output of said bridge.

Claim 4

The improvement of claim 2 further characterized by a diode electrically connected to one of said input terminals, said diode providing a second output for said energy supply means.

Claim 5

The improvement of claim 1 wherein said stationary member of said motor comprises a stator assembly including a stator core constructed from a plurality of individual laminations of magnetic material, said stator core having an axial opening through it and a plurality of slots extending radially outwardly from said axial opening and being open thereto, and a winding in said slots, said winding comprising first and second phases, said first phase including first and second segments, said segments being formed from a plurality of coils constructed from a plurality of individual wire turns, said second phase comprising first and second segments, said segments being formed from a plurality of coils constructed from a plurality of individual wire turns, each of said coils having a straight conductor run portion extending for the axial length of said stator core, each individual axial length portion of said winding being placed in a single slot of said stator core so that only one individual axial length portion of said winding occupies one of said slots, pairs of said coils of said first and second phases defining a pole of said motor.

Claim 6

The improvement of claim 4 wherein the number of slots of said stator core equals two times the number of phases of the winding of said stationary member times the number of electrical poles of said winding.

Claim 7

The improvement of claim 5 further characterized by SCR circuit means electrically between the winding segments of said stationary member and the negative terminal of said bridge rectifier.

Claim 8

The improvement of claim 6 wherein said rotating member of said motor comprises a rotor assembly including a rotor core constructed from a plurality of individual laminations having a plurality of slots formed therein, said slots defining axial extending, winding receiving receptacles, a winding in said slots, and a shaft having said rotor assembly mounted thereto, said motor further including means for rotatably supporting said shaft mechanically connected to said shaft and said stator assembly, and position sensing means mounted to said shaft, said position sensing means including means for generating an output signal, said position sensing means being electrically connected to said SCR circuit means.

Claim 9

The improvement of claim 7 wherein said SCR circuit means comprises a plurality of SCR devices, individual ones of said SCR device plurality being electrically connected to respective ones of said winding segments, each of said SCR devices including a gate electrode electrically connected to said position sensing means, and a coasting path electrically connected from the cathode side of said SCR devices to the anode side of said SCR devices.

Claim 10

The improvement of claim 8 wherein each of said SCR devices has a current rate of change protector comprising an inductor electrically connected in series between the individual winding segment and the anode side of respective ones of said SCR device plurality.

Claim 11

The improvement of claim 9 further including a resistor, said resistor being connected in said coasting path between the common point of the anodes of said SCR devices and the cathode side of said SCR devices.

Claim 12

The improvement of claim 10 wherein said position sensing element comprises a member mounted to said shaft, said member including a pair of rings acting as the position sensing elements, two power brushes electrically connected to a switch, one each of said brushes being in mechanical contact with one of said rings, said rings having axially extending parts integrally formed with them, a plurality of signal brushes mounted to said motor, and adapted to ride on said axially extending parts, and a switch electrically connected to said second output of said energy supply means, said switch adapted to apply electrical energy to one of said rings through respective ones of said brushes.

Claim 13

The improvement of claim 11 wherein the number of said signal brushes is equal to four times the number of phases of said stator assembly winding.

Claim 14

The improvement of claim 12 wherein said signal brushes are located at adjacent pole centers of each phase of said stator assembly winding.

Claim 15

The improvement of claim 13 wherein said signal brushes are electrically connected through a diode to a resistor and to the gate electrode of an individual one of said SCR device plurality, the total number of gate signal outputs being equal to two times the number of phases of said stator assembly winding.

Claim 16

The improvement of claim 14 wherein the axially extending part of each of said rings has an angular width equal to the angle theta, where theta is equal to 360° divided by the number of poles of said stator assembly winding.

Claim 17

The improvement of claim 15 wherein said rings are positioned on said shaft at an angle alpha and beta measured from the center of a slot of said rotor core, the sum of the angles alpha and beta being chosen from a range between 85 and 275 electrical degrees.

Claim 18

The improvement of claim 15 wherein said rings are positioned on said shaft at an angle alpha and beta measured from the center of the slot of said rotor core, the sum of the angles alpha and beta being chosen from a range between 85+(N) (360°) to 275+N(360°) electrical degrees, where N is an integer.

Claim 19

A motor system comprising: a power supply, said power supply including a first output and a second output, and means for varying said first output; an electrical motor having a stator assembly and a rotor assembly, said rotor assembly including a rotor winding connected to said first output of said power supply, said stator including a stator winding connected to said first output of said power supply and to an SCR circuit means; Scr circuit means having an input side connected to the winding of said stator assembly, and an output side connected to said power supply, said SCR circuit means including a plurality of individual SCR devices and gate circuit means for energizing said SCR devices; means for detecting the position of said rotor, said position detecting means having an input side electrically connected to said second output side of said power supply, and an output side electrically connected to the gate circuit means of said SCR circuit means; and means for applying power from the second output of said power supply to said position detecting means so as to vary the direction of rotation of said rotor assembly.

Claim 20

A motor system comprising: a power supply, said power supply including a first output and a second output, and means for varying said first output; an electrical motor having a stator assembly and a rotor assembly, said rotor assembly including a rotor winding connected to said first output of said power supply, said stator including a stator winding connected to said first output of said power supply and to an SCR circuit means; Scr circuit means having an input side connected to the winding of said stator assembly, and an output side connected to said power supply, said SCR circuit means including a plurality of individual SCR devices and gate circuit means for energizing said SCR devices; means for detecting the position of said rotor, said position detecting means having an input side electrically connected to said second output side of said power supply, and an output side electrically connected to the gate circuit means of said SCR circuit means; and means for applying power from the second output of said power supply to said position detecting means so as to vary the direction of rotation of said rotor assembly.

Claim 21

The motor system of claim 18 wherein said stator assembly is further characterized by a stator core constructed from a plurality of individual laminations of magnetic material, said stator core having an axial opening through it defining a bore, a plurality of slots extending radially outwardly from said axial opening and opening into said bore, and a winding in said slots, said winding comprising a first phase and a second phase, said first phase including first and second segments, said segments being formed from a plurality of coils constructed from individual wire turns, said second phase comprising third and fourth segments, said third and fourth segments being formed from a plurality of coils constructed from individual wire turns, each of the coils of said segments having a straight conductor run portion extending for the axial length of said stator core, each individual axial length portion of each of said coils being placed in a single slot of said core so that only an individual axial length portion of said winding occupies one of said slots, pairs of said coils of said first and second phases defining an electrical pole for said motor.

Claim 22

The motor system of claim 19 wherein the number of slots of said core assembly equals two times the number of phases of the winding of said stator assembly times the number of electrical poles of said winding.

Claim 23

The motor system of claim 20 wherein said rotor assembly is further characterized by a rotor core constructed from a plurality of individual laminations having a plurality of slots formed therein, said slots defining axially extending, winding receiving receptacles, a winding in said slots and a shaft having said rotor assembly mounted thereto, said motor further including means for rotatably supporting said shaft, said position detecting means being mounted to said shaft, said position detecting means including means for generating an output signal, said output signal generating means being electrically connected to said gate circuit means of said SCR devices.

Claim 24

The motor system of claim 21 wherein said SCR circuit means comprises a plurality of SCR devices, individual ones of said SCR device plurality being electrically connected to respective ones of said winding segments, each of said SCR devices including a gate electrode electrically connected to said output generating means of said position detecting means, and a coasting path electrically connected from the cathode side of said SCR devices to the anode side of said SCR devices.

Claim 25

The motor system of claim 22 wherein each of said SCR devices has a current rate of change protector comprising an inductor electrically connected in series between the individual windings segment of said stator assembly winding and the anode side of respective ones of said SCR device plurality.

Claim 26

The motor system of claim 23 further including a resistor, said resistor being connected in said coasting path between the common point of the anodes of said SCR device plurality and the cathode side of said SCR device plurality.

Claim 27

The motor system of claim 24 wherein said position detecting means comprises a member mounted to said shaft, said member including a pair of rings acting as the position sensing elements, two power brushes electrically connected to a switch, one each of said brushes being in mechanical contact with one of said rings, said rings having axially extending parts integrally formed with them, and a plurality of signal brushes mounted to said motor and adapted to ride on said axially extending parts, and switch means, said switch means being adapted to apply electrical energy to one of said rings through respective ones of said brushes.

Claim 28

The motor system of claim 25 wherein the number of said signal brushes is equal to four times the number of phases of said stator assembly winding.

Claim 29

The improvement of claim 26 wherein signal brushes are located at adjacent stator pole centers of the first and second phases of said stator winding.

Claim 30

The motor system of claim 27 wherein said signal brushes are electrically connected through a diode to a resistor and to the gate electrode of an individual SCR device, the total number of gate signal outputs being equal to two times the number of phases of said stator windings.

Claim 31

The motor system of claim 28 wherein the axially extending parts of each of said rings has an angular width equal to an angle theta, where theta is equal to 360° divided by the number of poles of said stator winding.

Claim 32

The motor system of claim 29 wherein said rings are positioned on said shaft at an angle alpha and beta, respectively, said angles alpha and beta being measured from the center of a slot of said rotor core, the sum of the angles alpha and beta being chosen from a range between 85 and 275 electrical degrees.

Claim 33

The motor system of claim 29 wherein said rings are positioned on said shaft at an angle alpha and beta, respectively, said angles alpha and beta being measured from the center of the slot of said rotor core, the sum of the angles alpha and beta being chosen from a range between 85°+(N) (360°) to 275°+(N(360°) electrical degrees, where N is an integer.

Claim 34

A motor system for operating a device including a member having at least two operational modes, one of said modes being a constant cyclic reversal movement occurring at some predetermined interval of rotation of said member, and the other of said modes being a continuous rotation of said member in a preselected direction, which comprises: a power supply, said power supply having a first variable output and a second approximately constant output; an electrical motor including a stator assembly having a stator winding, a rotor assembly rotatably mounted with respect to said stator assembly, said rotor assembly being mechanically connected to said member; Scr circuit means including a plurality of individual SCR devices, said SCR devices having anode sides electrically connected to said stator winding and cathode sides electricaly connected to said power supply, and gate electrodes for energizing said SCR devices; means for detecting the position of said rotor assembly and for generating a signal based on that position to energize preselected ones of said SCR devices through said gate electrodes; and means for applying power from said second output of said power supply to said position detecting and signal generating means, said power supply means adapted to vary the direction of rotation of said rotor assembly.

Claim 35

A motor system for operating a device including a member having at least two operational modes, one of said modes being a constant cyclic reversal movement occurring at some predetermined interval of rotation of said member, and the other of said modes being a continuous rotation of said member in a preselected direction, which comprises: a power supply, said power supply having a first variable output and a second approximately constant output; an electrical motor including a stator assembly having a stator winding, a rotor assembly rotatably mounted with respect to said stator assembly, said rotor assembly being mechanically connected to said member; Scr circuit means including a plurality of individual SCR devices, said SCR devices having anode sides electrically connected to said stator winding and cathode sides electricaly connected to said power supply, and gate electrodes for energizing said SCR devices; means for detecting the position of said rotor assembly and for generating a signal based on that position to energize preselected ones of said SCR devices through said gate electrodes; and means for applying power from said second output of said power supply to said position detecting and signal generating means, said power supply means adapted to vary the direction of rotation of said rotor assembly.

Claim 36

A motor system, comprising: a stator assembly, said stator assembly including a stator core constructed from a plurality of individual laminations of magnetic material, said stator core having an axial opening therethrough, said axial opening defining a bore, a plurality of slots opening to said bore, and a winding in said slots; a rotor assembly, said rotor assembly including a rotor core constructed from a plurality of laminations of magnetic material, said lamination plurality having winding receiving slots formed therein, and a winding in said slots; power supply means operatively connected to said stator and rotor assembly; a shaft, said shaft having said rotor assembly mounted thereto; means for rotatably supporting said shaft; means for determining the position of said rotor assembly, said positioning determining means comprising: a first segmental ring mounted to said shaft, said first ring including a continuous annular ring portion and a plurality of spaced axially extending parts connected to said ring portion; a second segmental ring mounted to said shaft, said second ring including a continuous annular ring portion and a plurality of spaced axially extending parts connected to said ring portion; a first input power brush mechanically connected to said continuous portion of said first ring; a second input power brush mechanically connected to said second continuous ring portion; and a plurality of position sensing brushes adapted to sense the passing of said axially extending parts of said rings, pairs of said sensing brushes being aligned with one another so as to read from one of said first and said second rings, each of said aligned brushes being electrically connected to the anode side of a diode, the cathode side of said diode being electrically connected to a resistor; and means responsive to said rotor assembly position determining means for controlling application of electrical energy through said stator assembly.

Claim 37

A motor system, comprising: a stator assembly, said stator assembly including a stator core constructed from a plurality of individual laminations of magnetic material, said stator core having an axial opening therethrough, said axial opening defining a bore, a plurality of slots opening to said bore, and a winding in said slots; a rotor assembly, said rotor assembly including a rotor core constructed from a plurality of laminations of magnetic material, said lamination plurality having winding receiving slots formed therein, and a winding in said slots; power supply means operatively connected to said stator and rotor assembly; a shaft, said shaft having said rotor assembly mounted thereto; means for rotatably supporting said shaft; means for determining the position of said rotor assembly, said positioning determining means comprising: a first segmental ring mounted to said shaft, said first ring including a continuous annular ring portion and a plurality of spaced axially extending parts connected to said ring portion; a second segmental ring mounted to said shaft, said second ring including a continuous annular ring portion and a plurality of spaced axially extending parts connected to said ring portion; a first input power brush mechanically connected to said continuous portion of said first ring; a second input power brush mechanically connected to said second continuous ring portion; and a plurality of position sensing brushes adapted to sense the passing of said axially extending parts of said rings, pairs of said sensing brushes being aligned with one another so as to read from one of said first and said second rings, each of said aligned brushes being electrically connected to the anode side of a diode, the cathode side of said diode being electrically connected to a resistor; and means responsive to said rotor assembly position determining means for controlling application of electrical energy through said stator assembly.

Claim 38

The motor system of claim 33 wherein the windings of said stator assembly comprise a first phase and a second phase, said first phase including a first segment and a second segment, said segments being formed from a plurality of coils constructed from a plurality of individual wire turns, said second phase comprising a third segment and a fourth segment, said third and fourth segment being formed from a plurality of coils constructed from a plurality of individual wire turns, each of said coils having a straight conductor run portion extending for the axial length of said stator core, each individual axial length portion of said coils being placed in a single slot of said stator core so that only one individual axial length portion of said core occupies one of the slots in said stator core, pairs of the coils of said first and second phases defining an electrical pole for said stator assembly.

Claim 39

The motor system of claim 34 wherein the number of slots of said stator core equals two times the number of phases of the windings of said stator assembly times the number of electrical poles of said winding.