Patent US3740632A successfully refreshed from Google Patents.
US3740632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor reversing and stopping circuit
Assignee: Franklin Electric Co Inc
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Filing: 1971-11-01
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Granted: 1973-06-19
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Expires: 1991-11-01
Abstract
Abstract In an AC motor having a main winding and a start winding, a triac uncouples the start winding from AC power when the motor reaches a preselected cut-out speed. When the motor is to be decelerated, a manual switch is actuated to reversely connect the start winding, producing an instant step change in phase which actuates the triac to recouple the start winding to AC power. In one embodiment for reversing the direction of rotation, the motor decelerates through zero and immediately accelerates in the opposite direction until the cut-out speed is reached, causing the triac to again uncouple the start winding. A second embodiment, for stopping the motor, passes current for the main and start windings through a master power triac controlled by a gating circuit including a switch mounted to the rotor of the motor. As the motor decelerates to zero and just begins to accelerate in the opposite direction, the rotor mounted switch opens and deactuates the master power triac.
Inventors
- 👤 J Whitney
- 👤 R Woods
- 👤 W Hohman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:02
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/42; H02P23/00; H02P23/24
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
165 words
A circuit for controlling the direction of rotation of a reversible AC motor having a plurality of windings interconnectable in one combination to cause rotation in one direction and in a different combination to cause rotation in an opposite direction, comprising: an AC source; winding switch means actuable to connect and deactuable to disconnect at least one of said windings from said AC source; reversal switch means having one state for interconnecting said plurality of windings in said one combination and a different state for interconnecting said plurality of windings in said different combination; and control means for actuating said winding switch means when said motor is first connected to said AC source and for deactuating said winding switch means when said motor reaches a cut-out speed, including network means effective when said motor has exceeded said cutout speed for actuating said winding switch means in response to a change in the state of said reversal switch means to produce rapid reversal of said motor.
Claim 2
Dependent Claim
165 words
A circuit for controlling the direction of rotation of a reversible AC motor having a plurality of windings interconnectable in one combination to cause rotation in one direction and in a different combination to cause rotation in an opposite direction, comprising: an AC source; winding switch means actuable to connect and deactuable to disconnect at least one of said windings from said AC source; reversal switch means having one state for interconnecting said plurality of windings in said one combination and a different state for interconnecting said plurality of windings in said different combination; and control means for actuating said winding switch means when said motor is first connected to said AC source and for deactuating said winding switch means when said motor reaches a cut-out speed, including network means effective when said motor has exceeded said cutout speed for actuating said winding switch means in response to a change in the state of said reversal switch means to produce rapid reversal of said motor.
Claim 3
Dependent Claim
44 words
The circuit of claim 1 wherein an electrical parameter in said control means is changed in response to a change in combination of said plurality of windings, and said network means is responsive to said electrical parameter change for actuating said winding switch means.
Claim 4
Dependent Claim
46 words
The circuit of claim 2 wherein said AC source produces an alternating applied voltage, and said electrical parameter comprises the phase difference of a signal with respect to said applied voltage, said network means being responsive to a phase shift for actuating said winding switch means.
Claim 5
Dependent Claim
107 words
The circuit of claim 1 wherein said plurality of windings comprise main winding means and start winding means, means for connecting said main winding means in parallel with said AC source, said winding switch means comprises thyristor means having power terminals exhibiting conductive and nonconductive states therebetween under control of a gate signal at a gate terminal, and said control means includes series means for connecting said start winding means and said power terminals in series across said AC source, and gate control means including said network means for generating the gate signal coupled to said gate terminal for gating said thyristor means into said conductive state.
Claim 6
Dependent Claim
85 words
The circuit of claim 4 wherein said gate control means includes electrical path means in parallel with said AC source for developing a reference electrical having a phase fixed with respect to a phase of voltage from said AC source, and said network means is connected with said electrical path means and said gate terminal for controlling the state of said thyristor means in response to a relative phase difference between the phase of a start winding signal and the phase of said reference signal.
Claim 7
Dependent Claim
24 words
The circuit of claim 5 wherein said network means includes impedance means coupled between said gate terminal and a junction in said series means.
Claim 8
Dependent Claim
80 words
The circuit of claim 6 wherein said impedance means has a time constant to pass a gate signal corresponding to the voltage sum of applied voltage and induced voltage across said start winding means when said thyristor means goes nonconductive, said voltage sum having a phase changing with motor speed, and said network means includes disabling means controlled by the phase of said reference signal for disabling said gate terminal at a predetermined phase angle with respect to applied voltage.
Claim 9
Dependent Claim
28 words
The circuit of claim 7 including a start capacitor, and said series means connects said start capacitor in series between said start winding means and said thyristor means.
Claim 10
Dependent Claim
44 words
The circuit of claim 1 including sensing means for indicating when said motor has decelerated to substantially zero speed, and said control means includes stop means for deactuating said winding switching means in response to a substantially zero speed indication from said sensing means.
Claim 11
Dependent Claim
42 words
The circuit of claim 9 wherein said stop means includes thyristor means connected in series between said AC source and said plurality of windings, said sensing means causing said tHyristor means to become nonconductive in response to said substantially zero speed indication.
Claim 12
Dependent Claim
193 words
In an AC motor having main winding means and start winding means each connectable with an AC source, said start winding means having one connection to cause rotation in one direction and a different connection to cause rotation in an opposite direction, a circuit for controlling and reversing the direction of rotation of the motor, comprising: main winding circuit means for connecting said main winding means in parallel with said AC source; thyristor means; start winding circuit means for connecting said start winding means and said thyristor means in series across said AC source to control the gating of AC power to said start winding means, including reversal switch means for selecting said one connection and said different connection for said start winding means to control the direction of rotation of said motor; and control means for actuating said thyristor means when said motor is below a cut-out speed and for deactuating said thyristor means when said motor exceeds said cut-out speed, including phase responsive means responsive to a change in phase in said start winding circuit means when the connection of said start winding means is changed for actuating said thyristor means.
Claim 13
Dependent Claim
193 words
In an AC motor having main winding means and start winding means each connectable with an AC source, said start winding means having one connection to cause rotation in one direction and a different connection to cause rotation in an opposite direction, a circuit for controlling and reversing the direction of rotation of the motor, comprising: main winding circuit means for connecting said main winding means in parallel with said AC source; thyristor means; start winding circuit means for connecting said start winding means and said thyristor means in series across said AC source to control the gating of AC power to said start winding means, including reversal switch means for selecting said one connection and said different connection for said start winding means to control the direction of rotation of said motor; and control means for actuating said thyristor means when said motor is below a cut-out speed and for deactuating said thyristor means when said motor exceeds said cut-out speed, including phase responsive means responsive to a change in phase in said start winding circuit means when the connection of said start winding means is changed for actuating said thyristor means.
Claim 14
Dependent Claim
26 words
The circuit of claim 11 wherein said start winding circuit means includes start capacitor means in series with said start winding means and said thyristor means.
Claim 15
Dependent Claim
117 words
The circuit of claim 11 wherein said thyristor means has power terminals exhibiting conductive and nonconductive states therebetween under control of a gate signal at a gate terminal, said start winding circuit means connects said power terminals in a series electrical path with said start winding means, and said phase responsive means includes first network means coupled between said electrical path and said gate terminal for producing said gate signal having a phase with respect to voltage from said AC source which shifts with a change in speed of said motor, said changed connection of said start winding means causing the phase of said gate signal to shift for a fixed speed of rotation of said motor.
Claim 16
Dependent Claim
52 words
The circuit of claim 13 wherein said control means includes second network means coupled to said gate terminal for effectively disabling the gate signal, including means coupled in parallel with said AC source for causing said disabling to occur at a fixed phase angle with respect to voltage from said AC source.
Claim 17
Dependent Claim
68 words
The circuit of claim 14 wherein said second network means includes shunt thyristor means actuable to shunt said gate signal from said gate terminal, and said parallel coupled means includes voltage breakdown means for enabling said shunt thyristor means after voltage from said AC source exceeds a breakover potential, thereby actuating said shunt thyristor means at a fixed phase angle which lags the voltage from said AC source.
Claim 18
Dependent Claim
151 words
In an AC motor having main winding means and start winding means each connectable with an AC source, a circuit for controlling and stopping rotation of the motor, comprising: first thyristor means; start winding circuit means for connecting said start winding means and said first thyristor means in series, including switch means for reversing the series connection of said start winding means; braking control means for actuating said first thyristor means in response to said switch means reversing the series connection to pass a braking current to rapidly decelerate the motor; sensing means for indicating when the motor has decelerated to substantially zero speed; second thyristor means; and power circuit means for connecting at least said main winding means in series between said second thyristor means and said AC source, including stop means for deactuating said second thyristor means in response to a substantially zero speed indication from said sensing means.
Claim 19
Dependent Claim
151 words
In an AC motor having main winding means and start winding means each connectable with an AC source, a circuit for controlling and stopping rotation of the motor, comprising: first thyristor means; start winding circuit means for connecting said start winding means and said first thyristor means in series, including switch means for reversing the series connection of said start winding means; braking control means for actuating said first thyristor means in response to said switch means reversing the series connection to pass a braking current to rapidly decelerate the motor; sensing means for indicating when the motor has decelerated to substantially zero speed; second thyristor means; and power circuit means for connecting at least said main winding means in series between said second thyristor means and said AC source, including stop means for deactuating said second thyristor means in response to a substantially zero speed indication from said sensing means.
Claim 20
Dependent Claim
48 words
The circuit of claim 16 wherein said power circuit means is in a series current path with both said main winding means and said start winding circuit means, and said stop means deactuates said second thyristor means to terminate current flow and thereby deactuate said first thyristor means.
Claim 21
Dependent Claim
81 words
The circuit of claim 16 wherein said braking control means includes start control means for actuating said first thyristor means when said motor is initially connected to said AC source and for disabling said first thyristor means when said motor reaches a cut-out speed, including network means effective when said motor has a speed in excess of said cut-out speed for reactuating said first thyristor means in response to said switch means reversing the series connection of said start winding means.
Claim 22
Dependent Claim
28 words
The circuit of claim 18 wherein said network means is responsive to a change in phase in said start winding circuit means for actuating said first thyristor means.
Claim 23
Dependent Claim
62 words
The circuit of claim 16 wherein said power circuit means includes first trigger means and second trigger means each capable of actuating said second thyristor means, power switch means for disabling said first trigger means when said motor is to be stopped, and said second trigger means is effective to continue actuating said second thyristor means until disabled by said stop means.
Claim 24
Dependent Claim
66 words
The circuit of claim 20 wherein said second thyristor means has power terminals exhibiting conductive and nonconductive states therebetween under control of a trigger signal at a gate terminal, said power circuit means connecting said power terminals in series with at least said main winding means, and said first trigger means connects said power switch means between one of said main terminals and said gate terminal.
Claim 25
Dependent Claim
78 words
The circuit of claim 20 wherein said second trigger means includes capacitor means for supplying an actuating signal for said second thyristor means, capacitor charge means connecting said power switch means in series between said AC source and said capacitor means to charge said capacitor means, and said stop means comprises controllable switch means in shunt with said capacitor means for discharging said capacitor means when said sensing means indicates the motor has decelerated to substantially zero speed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |