Electricity: measuring and testing – Magnetic – Displacement
Patent
1990-05-31
1991-10-08
Raevis, Robert
Electricity: measuring and testing
Magnetic
Displacement
G01B 730
Patent
active
050557823
ABSTRACT:
A method determines the absolute position of a pointer in an indicating device in which the pointer is moved by a rotor (2) of a rotating-field (1) via a gearing (31). An indicating device is also disclosed. Indicating devices with gearing have the problem that no absolute reference between the position of the pointer (33) and the position of the rotor (2) in the rotating-field motor (1) is present when the device is started and the reference is lost. In order to restore the reference, the pointer (33) is moved by a rotating field in a rotating-field motor (1) in a predetermined direction of the rotating field against a stop (34). The rotating field is turned further in the direction of the rotating field. A signal induced in the field-generating part (4, 5) of the rotating-field motor by a movement of the rotor (2) contrary to the direction of the rotating field is detected, and from the angular position of the rotating field upon the occurrence of the induced signal, the angular position of the rotor at which the pointer rests against the stop is determined.
REFERENCES:
patent: 3977248 (1976-08-01), Metzger
patent: 3998179 (1976-12-01), Dieterich et al.
patent: 4490674 (1984-12-01), Ito
Farber Martin A.
Raevis Robert
VDO Adolf Schindling AG
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