Analog display device, particularly a tachometer

Details Analog display device, particularly a tachometer Analog display device, particularly a tachometer

1984-08-01

1986-01-28

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

318696, G01P 342, G05B 1940

Patent

active

045674345

ABSTRACT:
In an analog display device, a pointer (1) can be reset by a stepping motor (2) which receives a constant number of pulses upon a reset command. In this way, starting from any position, the pointer is certain to reach the stop which corresponds to its zero position. In order in this connection to keep the mechanical force on the stop (6) and the transmission elements (3 and 4) between the pointer and the stepping motor small, the pulses for the resetting are produced initially with a relatively low pulse frequency and then with a higher pulse frequency. As a result, the stepping motor starts up reliably with a relatively high driving torque but gives off only a smaller driving torque when the stop in the zero position is reached.

REFERENCES:
patent: 4314146 (1982-02-01), Berney
patent: 4475082 (1984-10-01), Lindig
Bianculli: "Stepper Motors"-IEEE Spectrum-Dec. 1970, pp. 25-29.

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