US4933800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor overload detection with predetermined rotation reversal
Assignee: Individual
•
Filing: 1989-05-19
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Granted: 1990-06-12
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Expires: 2009-05-19
Abstract
Abstract An apparatus is provided for controlling an electric motor that is doing some sort of work, whereby the apparatus automatically senses the presence of a work overload. Once the work overload is sensed, the apparatus automatically reverses the direction of rotation of the motor to eliminate the work overload. The reversed rotation is limited to either a predetermined period of time or to a predetermined number of reverse rotations. Once the predetermined limit of reverse rotation is reached, the apparatus automatically resumes normal rotation of the motor.
Inventors
- 👤 Tai-Her Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:51
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/085; H02H7/0856; H02H7/0859; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/406; G05B19/4062
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
159 words
An apparatus for reversing the direction of rotation of a motor from normal operation and for restoring the normal direction of rotation, comprising: means for detecting current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor, said motor reversing means being responsive to said reverse rotation limiting means, whereby said motor reversing means are automatically restored to normal operation in response to said reverse rotation limiting means, whereby the motor is automatically restored to rotate in the normal direction of rotation.
Claim 2
Independent Claim
159 words
An apparatus for reversing the direction of rotation of a motor from normal operation and for restoring the normal direction of rotation, comprising: means for detecting current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor, said motor reversing means being responsive to said reverse rotation limiting means, whereby said motor reversing means are automatically restored to normal operation in response to said reverse rotation limiting means, whereby the motor is automatically restored to rotate in the normal direction of rotation.
Claim 3
Dependent Claim
40 words
The apparatus described in claim 1, wherein said reverse rotation limiting means include means for timing a predetermined length of time for permitting reverse rotation, whereby said means for reversing direction of motor rotation are responsive to said timing means.
Claim 4
Dependent Claim
73 words
The apparatus described in claim 1, wherein said reverse rotation limiting means include means for providing a measurement signal representative of the amount of reverse rotation, means for providing a reference signal representative of a predetermined amount of reverse rotation, and means for providing a comparison signal representing a difference between said measurement signal and said reference signal, whereby said means for reversing direction of motor rotation are responsive to said comparison signal.
Claim 5
Dependent Claim
45 words
The apparatus described in claim 1, wherein said reverse rotation limiting means include means for providing a signal representative of the amount of reverse positioning of a driven load, whereby said means for reversing direction of motor rotation are responsive to said reverse positioning signal.
Claim 6
Dependent Claim
13 words
The apparatus described in claim 1, wherein the motor is a DC motor.
Claim 7
Dependent Claim
13 words
The apparatus described in claim 1, wherein the motor is an AC motor.
Claim 8
Independent Claim
199 words
An apparatus for reversing the normal direction of DC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring DC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including means for providing a measurement signal representative of the amount of reverse rotation, means for providing a reference signal representative of a predetermined amount of reverse rotation, and means for providing a comparison signal representing a difference between said measurement signal and said reference signal, whereby said means for reversing direction of motor rotation are responsive to said comparison signal for automatically restoring the motor to rotate in the normal direction of rotation.
Claim 9
Independent Claim
199 words
An apparatus for reversing the normal direction of DC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring DC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including means for providing a measurement signal representative of the amount of reverse rotation, means for providing a reference signal representative of a predetermined amount of reverse rotation, and means for providing a comparison signal representing a difference between said measurement signal and said reference signal, whereby said means for reversing direction of motor rotation are responsive to said comparison signal for automatically restoring the motor to rotate in the normal direction of rotation.
Claim 10
Independent Claim
175 words
An apparatus for reversing the direction of rotation of a DC motor from normal operation when encountering a work overload and for restoring the normal direction of rotation when the work overload is eliminated, comprising: means for monitoring DC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, the reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor, said motor rotation reversing means being responsive to said limiting means, said limiting means including means for timing a predetermined length of time of reverse rotation whereby the motor is automatically restored to rotate in the normal direction after the expiration of said predetermined length of time.
Claim 11
Independent Claim
175 words
An apparatus for reversing the direction of rotation of a DC motor from normal operation when encountering a work overload and for restoring the normal direction of rotation when the work overload is eliminated, comprising: means for monitoring DC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, the reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor, said motor rotation reversing means being responsive to said limiting means, said limiting means including means for timing a predetermined length of time of reverse rotation whereby the motor is automatically restored to rotate in the normal direction after the expiration of said predetermined length of time.
Claim 12
Independent Claim
177 words
An apparatus for reversing the normal direction of DC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring DC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including means for providing a signal representative of a predetermined amount of reverse positioning of a driven load, said means for reversing direction of motor rotation being responsive to said reverse positioning signal, whereby the motor is automatically restored to rotate in the normal direction after said predetermined amount of reverse positioning.
Claim 13
Independent Claim
177 words
An apparatus for reversing the normal direction of DC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring DC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including means for providing a signal representative of a predetermined amount of reverse positioning of a driven load, said means for reversing direction of motor rotation being responsive to said reverse positioning signal, whereby the motor is automatically restored to rotate in the normal direction after said predetermined amount of reverse positioning.
Claim 14
Independent Claim
206 words
An apparatus for reversing the normal direction of AC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring AC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including: means for providing a measurement signal representative of the amount of reverse rotation, means for providing a reference signal representative of a predetermined amount of reverse rotation, and means for providing a comparison signal representing a difference between said measurement signal and said reference signal, said means for reversing direction of motor rotation being responsive to said comparison signal whereby the motor is automatically restored to rotate in the normal direction of rotation after said predetermined amount of reverse rotation.
Claim 15
Independent Claim
206 words
An apparatus for reversing the normal direction of AC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring AC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including: means for providing a measurement signal representative of the amount of reverse rotation, means for providing a reference signal representative of a predetermined amount of reverse rotation, and means for providing a comparison signal representing a difference between said measurement signal and said reference signal, said means for reversing direction of motor rotation being responsive to said comparison signal whereby the motor is automatically restored to rotate in the normal direction of rotation after said predetermined amount of reverse rotation.
Claim 16
Independent Claim
166 words
An apparatus for reversing the direction of rotation of an AC motor from normal operation when encountering a work overload and for restoring the normal direction of rotation when the work overload is eliminated, comprising: means for monitoring AC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, the reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor, said limiting means including means for timing a predetermined length of time of reverse rotation, whereby the motor is automatically restored to operate in the normal direction of rotation after the expiration of said predetermined length of time.
Claim 17
Independent Claim
166 words
An apparatus for reversing the direction of rotation of an AC motor from normal operation when encountering a work overload and for restoring the normal direction of rotation when the work overload is eliminated, comprising: means for monitoring AC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, the reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor, said limiting means including means for timing a predetermined length of time of reverse rotation, whereby the motor is automatically restored to operate in the normal direction of rotation after the expiration of said predetermined length of time.
Claim 18
Independent Claim
179 words
An apparatus for reversing the normal direction of AC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring AC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including means for providing a signal representative of a predetermined amount of reverse positioning of a driven load, said means for reversing direction of motor rotation being responsive to said reverse positioning signal, whereby the motor is automatically restored to rotate in the normal direction of rotation after said predetermined amount of reverse positioning.
Claim 19
Independent Claim
179 words
An apparatus for reversing the normal direction of AC motor rotation when the motor encounters a work overload and for restoring the normal direction of rotation after the work overload is eliminated, comprising: means for monitoring AC current load utilized by the motor during normal rotation, means for comparing the current load utilized by the motor during normal rotation with a predetermined current load utilization level representative of a work overload, means, responsive to said current load comparing means, for automatically reversing the direction of motor rotation when the current load utilized by the motor during normal rotation exceeds the predetermined current load utilization level, reverse rotation serving to eliminate the work overload, means for automatically limiting the amount of reverse rotation of the motor including means for providing a signal representative of a predetermined amount of reverse positioning of a driven load, said means for reversing direction of motor rotation being responsive to said reverse positioning signal, whereby the motor is automatically restored to rotate in the normal direction of rotation after said predetermined amount of reverse positioning.
References Cited (Backward Citations)
US4412162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |