Position sensor

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United States of America Patent

PATENT NO 5070264
SERIAL NO

07582246

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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DC motors without collectors require position sensors, which recognize or identify the angular position of the rotor, in order to supply a pulse for control of the current in the coil at a suitable point in time. Hall probes which, as a rule, are used as positional sensors, involve a series of disadvantages, such as for instance sensitivity to temperature and radiation. In order to avoid these disadvantages, coils with a magnetic core through which alternating current is passed are installed in the stator-rotor air gap in accordance with the invention. The rotor comprises in the axial segment opposite the coils a magnetic portion and a nonmagnetic portion. This generates a change in the voltage drop at the coil during each rotor revolution.

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Patent Owner(s)

Patent OwnerAddress
ARTHUR PFEIFFER VAKUUMTECHNIK WETZLAR GMBH35614 ASSLAR

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Conrad, Armin Herborn-Horbach, DE 27 228

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