Position sensor

Details Position sensor Position sensor

1990-09-14

1991-12-03

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310192, 324173, H02K 2316

Patent

active

050702645

ABSTRACT:
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.

REFERENCES:
patent: 2797376 (1957-06-01), Meade
patent: 3175140 (1965-03-01), Hogan et al.
patent: 3501664 (1970-03-01), Veillette
patent: 4525670 (1985-06-01), Miyagawa et al.
patent: 4652820 (1987-03-01), Maresca
patent: 4970423 (1990-11-01), Tamae et al.

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