Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-09-28
1990-02-20
Hudspeth, David
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307351, 307363, 307261, 328 35, 3281291, 328140, 388909, 388800, G01R 2309, G01R 2315
Patent
active
RE0331678
ABSTRACT:
A circuit for speed monitoring, particularly for fan drives. A detection device for producing an input signal sequence is provided which has a speed-dependent repetition frequency. The circuit also has a signal converter for converting the input signal sequence into an output signal whose amplitude is a function of the repetition frequency of the input signal sequence. There is also an evaluation circuit, having at least one threshold value element responsive to the output signal of the signal converter and which responds if the output signal amplitude reaches a value corresponding to a drop below a predetermined minimum speed or a rise above a predetermined maximum speed.
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Moosmann Helmut
Muller Rolf
Hudspeth David
Papst-Motoren GmbH & Co. KG
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