Patent US4100469A successfully refreshed from Google Patents.
US4100469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid motor starter
Assignee: Allen Bradley Co LLC
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Filing: 1977-04-25
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Granted: 1978-07-11
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Expires: 1997-04-25
Abstract
Abstract Both solid state static control devices and electromagnetically operated contactors are employed in an a-c motor starter. The solid state control devices are operated by an acceleration control circuit to accelerate the motor during start-up. When synchronous speed is achieved, a run contactor is energized and its contacts are closed to conduct motor current. Under steady state conditions, therefore, the solid state control devices are bypassed.
Inventors
- 👤 Terrance D. Nelson
- 👤 Bruce G. Klippel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:01
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/26; H02P1/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
A motor starter for coupling current from a power line to a motor, the combination comprising: a first conductive branch connected between the power line and the motor, said first conductive branch including a solid state device suitable for controlling current in said first branch and a set of series connected contacts associated with a start contactor; a second conductive branch connected between the power line and the motor in shunt with said first conductive branch, said second conductive branch including a set of contacts associated with a run contactor; and a control circuit which includes: (a) a start switch; (b) means coupled to said start switch for energizing said start contactor when said start switch is operated; (c) means coupled to said solid state device for driving it from its nonconductive state to its conductive state after said start contactor is energized; (d) speed feedback means coupled to said motor for sensing motor speed; (e) means coupled to said speed feedback means for energizing said run contactor when said motor reaches a preselected speed; and (f) means coupled to said start contactor for deenergizing the same after said run contactor is energized.
Claim 2
Dependent Claim
193 words
A motor starter for coupling current from a power line to a motor, the combination comprising: a first conductive branch connected between the power line and the motor, said first conductive branch including a solid state device suitable for controlling current in said first branch and a set of series connected contacts associated with a start contactor; a second conductive branch connected between the power line and the motor in shunt with said first conductive branch, said second conductive branch including a set of contacts associated with a run contactor; and a control circuit which includes: (a) a start switch; (b) means coupled to said start switch for energizing said start contactor when said start switch is operated; (c) means coupled to said solid state device for driving it from its nonconductive state to its conductive state after said start contactor is energized; (d) speed feedback means coupled to said motor for sensing motor speed; (e) means coupled to said speed feedback means for energizing said run contactor when said motor reaches a preselected speed; and (f) means coupled to said start contactor for deenergizing the same after said run contactor is energized.
Claim 3
Dependent Claim
84 words
The motor starter as recited in claim 1 in which said control circuit further includes: (g) ramp generator means for generating a reference signal indicative of the desired acceleration of the motor; and (h) speed comparator means coupled to said ramp generator means said speed feedback means, said speed comparator means being operable to generate a signal to said means for driving said solid state device which is proportional to the difference in actual motor speed and the speed indicated by said reference signal.
Claim 4
Dependent Claim
94 words
The motor starter as recited in claim 2 in which said control circuit further includes: (i) jam indicator means coupled to said speed feedback means and said ramp generator means, said jam indicator means being operable to generate a jam indication signal when the speed indicated by said reference signal exceeds actual motor speed by a preselected amount; and (j) means coupled to receive said jam indication signal for driving the solid state device to its nonconductive state when a jam is indicated and for deenergizing said start contactor a preselected time interval thereafter.
Claim 5
Dependent Claim
42 words
The motor starter as recited in claim 3 in which said means for driving the solid state device to its nonconductive state includes timing means which inhibits the operation thereof until said jam indication signal is present for a preselected time interval.
Claim 6
Dependent Claim
159 words
In a motor starter having solid state devices for controlling the current flowing to a motor, the improvement therein comprising: means coupled to said solid state device for driving it from its nonconductive state to its conductive state; speed feedback means coupled to said motor for sensing motor speed and for generating a speed feedback signal proportional thereto; reference generator means for generating a reference signal indicative of the desired acceleration of the motor; jam indicator means coupled to receive said speed feedback signal and said reference signal and being operable to generate a jam indication signal when the reference speed signal exceeds the speed feedback signal by a preselected amount; timing means coupled to receive said jam indication signal and being operable to generate a shut-down signal when said jam indication signal is present for a preselected time interval; and means coupled to receive said shut-down signal and to drive said solid state device to its nonconductive state.
Claim 7
Dependent Claim
159 words
In a motor starter having solid state devices for controlling the current flowing to a motor, the improvement therein comprising: means coupled to said solid state device for driving it from its nonconductive state to its conductive state; speed feedback means coupled to said motor for sensing motor speed and for generating a speed feedback signal proportional thereto; reference generator means for generating a reference signal indicative of the desired acceleration of the motor; jam indicator means coupled to receive said speed feedback signal and said reference signal and being operable to generate a jam indication signal when the reference speed signal exceeds the speed feedback signal by a preselected amount; timing means coupled to receive said jam indication signal and being operable to generate a shut-down signal when said jam indication signal is present for a preselected time interval; and means coupled to receive said shut-down signal and to drive said solid state device to its nonconductive state.
Claim 8
Dependent Claim
51 words
The improvement as recited in claim 5 in which the output of said jam indicator means is coupled to said reference generator means to clamp the reference signal generated thereby to a value indicative of a speed which is a preselected amount greater than the speed indicated by said feedback signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |