Magnetic flowmeter coil driver and method

Details Magnetic flowmeter coil driver and method Magnetic flowmeter coil driver and method

1987-01-15

1988-11-15

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

361154, G01F 160

Patent

active

047840005

ABSTRACT:
A magnetic flowmeter includes circuitry for applying a first relatively high voltage across the electromagnet coils of the meter for a controlled length of time to build the coil current to a desired level and circuitry for applying a second, relatively low voltage across the electromagnet coils after the application of the high voltage to maintain the coil current at the desired level. The coil current is sampled at predetermined times during the application of the relatively low voltage and the length of time the relatively high voltage is applied is varied to eliminate differences in consecutive coil current samples. The actual level of the coil current is controlled by a magnetic amplifier which includes a saturable reactor. The voltage waveform applied to the electromagnetic coil reverses in polarity each half cycle due to a bridge circuit which is connected to a power supply of a single polarity.

REFERENCES:
patent: 4144751 (1979-03-01), Yokoyama
patent: 4204240 (1980-05-01), Schmoock
patent: 4319301 (1982-03-01), Hill
patent: 4462060 (1984-07-01), Schmoock
patent: 4563904 (1986-01-01), Geisler et al.

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