Data processing: generic control systems or specific application – Specific application – apparatus or process – Specific application of temperature responsive control system
Reexamination Certificate
2005-02-01
2009-06-30
Shechtman, Sean P (Department: 2121)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Specific application of temperature responsive control system
C700S022000, C700S033000, C700S292000, C702S064000, C702S132000, C702S184000, C361S024000, C361S025000
Reexamination Certificate
active
07555366
ABSTRACT:
A thermal overload protection for an electrical device, particularly an electric motor (M), measures a load current supplied to the electrical device (M), and calculates the thermal load on the electrical device on the basis of the measured load current, and shuts off (S2) a current supply (L1, L2, L3) when the thermal load reaches a given threshold level. The protection comprises a processor system employing X-bit, preferably X=32, fixed-point arithmetic, wherein the thermal load is calculated by a mathematic equation programmed into the microprocessor system structured such that a result or a provisional result never exceeds the X-bit value.
REFERENCES:
patent: 4717984 (1988-01-01), Henry et al.
patent: 4796142 (1989-01-01), Libert
patent: 4807153 (1989-02-01), Onaga et al.
patent: 5329768 (1994-07-01), Moscrip
patent: 5644510 (1997-07-01), Weir
patent: 6563685 (2003-05-01), Gotzig
patent: 2004/0189236 (2004-09-01), Chan et al.
patent: 2008/0253041 (2008-10-01), Kuivalainen et al.
patent: WO 01/24340 (2001-04-01), None
Steven W. Smith—The Scientist and Engineer's Guide to Digital Signal Processing; Chapter 78, pp. 503-534 Dec. 28, 2001.
Kuivalainen Janne
Österback Peter
ABB Oy
Buchanan & Ingersoll & Rooney PC
Shechtman Sean P
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