Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Reexamination Certificate
2006-02-14
2006-02-14
Ip, Paul (Department: 2837)
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
C318S254100, C318S463000, C318S696000, C341S178000
Reexamination Certificate
active
06998813
ABSTRACT:
The invention provides a device to generate an rpm-dependent signal, or a tachogenerator, having a plurality of magnet elements with alternating polarity which are arranged and distributed around the circumference of the rotor shaft. The magnet elements preferably take the form of a magnetic ring which has alternatively polarized sections and is held on a support attached to the rotor shaft. The tachogenerator of the present invention has at least one coil parallel to the axis which is arranged on a second supporting device at an axial distance to the magnet elements. The magnets and coils are arranged spatially relative to each other and can be rotated in relation to each other with the rotation of the rotor shaft in order to induce an rpm-dependent signal in the coils. In accordance with the invention, a signal displacement device is provided which superimposes a DC voltage on the signals induced in the coils in order to generate a voltage-displaced signal. This DC voltage is preferably a positive DC voltage in order to raise the rpm-dependent signal to a positive voltage level.
REFERENCES:
patent: 3988024 (1976-10-01), Watanabe et al.
patent: 4109234 (1978-08-01), Davis
patent: 4240014 (1980-12-01), Muller
patent: 4291268 (1981-09-01), Okuyama
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patent: 5032773 (1991-07-01), Frank
patent: 5278773 (1994-01-01), Cousineau
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patent: 5451867 (1995-09-01), Loreck et al.
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patent: 42 16 142 (1993-11-01), None
patent: 199 54 115 (2001-04-01), None
patent: 1132949 (1968-11-01), None
DE 199 54 115 and DE 42 16 142. The listed documents are examples of sensing devices for rotors. A corresponding English abstract has been provided for each document.
Heizmann Joachim
Kloepzig Markus
Wysk Hans-Joachim
Duane Morris LLP
Ip Paul
Minebea Co. Ltd.
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