Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-07-11
2006-07-11
Nguyen, Hung (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S670000, C340S680000, C340S686300, C340S661000, C340S669000, C340S507000, C340S441000
Reexamination Certificate
active
07075446
ABSTRACT:
The invention concerns a method for generating an alarm signal in a motor which comprises a rotor (50) whose actual rotation speed during operation lies in a normal zone (nSoll, TSoll), can deviate from that normal zone in the event of a fault, and is to be monitored against a malfunction or fault state, comprising the following steps: At least one alarm switch-on rotation speed (nAOn, TAOn) and at least one alarm switch-off rotation speed (nAOff, TAOff) are defined, of which the latter is located closer to the normal zone than the former, an associated pair of alarm switch-on rotation speed and alarm switch-off rotation speed defining between them a hysteresis zone. When the rotation speed to be monitored arrives, coming from the hysteresis zone, at the alarm switch-on rotation speed, an alarm switch-on criterion (Flag DIR=0) is generated. The duration of this alarm switch-on criterion is monitored. When this duration reaches a predetermined value (tdOn), an alarm signal (ALARM) is activated (FIG.13: S186, S194). A corresponding microprocessor-controlled motor can be used to implement the method.
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patent: 5739761 (1998-04-01), Kobayashi
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patent: 6481387 (2002-11-01), Sano
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patent: 05-008 962 (1993-01-01), None
Patent Abstracts of Japan, English abstract of JP 05-008 962, Yamamoto/Fuji Electric, “Abnormal Speed Protecting Circuit for Elevator,” pub. Jan. 1993.
Jeske Frank
Kuner Arnold
Schondelmaier Hans-Dieter
ebm-papst St. Georgen GmbH & Co. KG
Milton Oliver, Esq.
Nguyen Hung
Ware Fressola Van Der Sluys & Adolphson LLP
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