EP0770573A3 - Device for measuring the load for a lifting device - Google Patents
Device for measuring the load for a lifting device Download PDFInfo
- Publication number
- EP0770573A3 EP0770573A3 EP96112970A EP96112970A EP0770573A3 EP 0770573 A3 EP0770573 A3 EP 0770573A3 EP 96112970 A EP96112970 A EP 96112970A EP 96112970 A EP96112970 A EP 96112970A EP 0770573 A3 EP0770573 A3 EP 0770573A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- hoist
- load
- excited
- measuring
- rotating field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
- B66D1/58—Safety gear responsive to excess of load
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Es wird eine Lasterfassungseinrichtung (39) für ein Hubwerk vorgeschlagen, wobei eine Elektromotoranordnung (11) des Hubwerks wenigstens zwei Drehfeldwicklungen (27, 28) mit unterschiedlicher Polzahl aufweist, von denen eine für den Antrieb des Hubwerks erregbar ist. Die Erfindung ist gekennzeichnet durch Mittel (41) zur Erfassung eines in einer anderen als der erregten Drehfeldwicklung (27, 28) bei Rotation induzierten Signals (40) und durch Mittel (55) zur Bestimmung der Momentanfrequenz einer vorbestimmten Spektralspitze des Frequenzspektrums des induzierten Signals (40) als ein Maß für die momentane Belastung des Hubwerks. A load detection device (39) for a hoist is proposed, an electric motor arrangement (11) of the hoist having at least two rotating field windings (27, 28) with different numbers of poles, one of which can be excited to drive the hoist. The invention is characterized by means (41) for detecting a signal (40) induced in a rotating field winding (27, 28) other than the excited one during rotation and by means (55) for determining the instantaneous frequency of a predetermined spectral peak of the frequency spectrum of the induced signal ( 40) as a measure of the momentary load on the hoist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19539927 | 1995-10-26 | ||
DE19539927A DE19539927A1 (en) | 1995-10-26 | 1995-10-26 | Load detection device for a hoist |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0770573A2 EP0770573A2 (en) | 1997-05-02 |
EP0770573A3 true EP0770573A3 (en) | 1998-09-09 |
Family
ID=7775874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96112970A Withdrawn EP0770573A3 (en) | 1995-10-26 | 1996-08-12 | Device for measuring the load for a lifting device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0770573A3 (en) |
DE (1) | DE19539927A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19802674C2 (en) * | 1998-01-24 | 2001-05-10 | Michael Ertl | Method for weight measurement of loads in lifting devices |
DE102018123150B4 (en) * | 2018-09-20 | 2021-04-15 | Johannes Hübner Fabrik elektrischer Maschinen GmbH | Rotary encoder and method for operating a hoist |
CN112125143B (en) * | 2020-09-23 | 2023-05-23 | 国网安徽省电力有限公司经济技术研究院 | Multi-point type supporting and lifting device for electric power iron tower installation construction |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1538806A1 (en) * | 1966-07-20 | 1970-01-02 | Grundig Emv | Method and circuit arrangement for the digital control of machine tools and the like. |
DE2850581A1 (en) * | 1978-11-22 | 1980-05-29 | Demag Ag Mannesmann | HOIST WITH POLE-SWITCHABLE SHORT-CIRCUIT MOTOR |
DE3623755A1 (en) * | 1986-07-15 | 1988-02-18 | Abus Kg | Device for overload protection of electrical drives |
US4761703A (en) * | 1987-08-31 | 1988-08-02 | Electric Power Research Institute, Inc. | Rotor fault detector for induction motors |
US5680025A (en) * | 1994-10-07 | 1997-10-21 | Csi Technology, Inc. | Proactive motor monitoring for avoiding premature failures and for fault recognition |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4336595A (en) * | 1977-08-22 | 1982-06-22 | Lockheed Corporation | Structural life computer |
DE3048964A1 (en) * | 1980-12-24 | 1982-07-08 | Mannesmann AG, 4000 Düsseldorf | METHOD AND DEVICE FOR DETERMINING THE LOAD OF A LIFTER |
-
1995
- 1995-10-26 DE DE19539927A patent/DE19539927A1/en not_active Withdrawn
-
1996
- 1996-08-12 EP EP96112970A patent/EP0770573A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1538806A1 (en) * | 1966-07-20 | 1970-01-02 | Grundig Emv | Method and circuit arrangement for the digital control of machine tools and the like. |
DE2850581A1 (en) * | 1978-11-22 | 1980-05-29 | Demag Ag Mannesmann | HOIST WITH POLE-SWITCHABLE SHORT-CIRCUIT MOTOR |
DE3623755A1 (en) * | 1986-07-15 | 1988-02-18 | Abus Kg | Device for overload protection of electrical drives |
US4761703A (en) * | 1987-08-31 | 1988-08-02 | Electric Power Research Institute, Inc. | Rotor fault detector for induction motors |
US5680025A (en) * | 1994-10-07 | 1997-10-21 | Csi Technology, Inc. | Proactive motor monitoring for avoiding premature failures and for fault recognition |
Also Published As
Publication number | Publication date |
---|---|
DE19539927A1 (en) | 1997-04-30 |
EP0770573A2 (en) | 1997-05-02 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE DE FR NL |
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PUAL | Search report despatched |
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17P | Request for examination filed |
Effective date: 19981015 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20010301 |