Force-temperature stabilization of an electromagnetic device

Details Force-temperature stabilization of an electromagnetic device Force-temperature stabilization of an electromagnetic device

1981-05-15

1983-02-15

Schreyer, Stafford D.

Recorders

Record receiver deforming

361152, G01D 1518

Patent

active

043743862

ABSTRACT:
An ink jet pump is switched from a mechanically off or idle state to a mechanically on or active state with no drift in pressure output by maintaining the pump at the same point in its force-temperature characteristic when it is on and off. This is accomplished by driving the pump in both the active and idle states with signals that dissipate the same amount of power in the pump. The frequency of the idle state signal is high enough that the pump can not mechanically respond. The power dissipations in the active and idle states are matched by adjusting the current build-up and current decay through the coil of the pump during the idle state. When the RMS current through the coil in the active state equals the RMS current in the idle state, the power dissipations are matched.

REFERENCES:
patent: 3787882 (1974-01-01), Fillmore et al.
patent: 4217594 (1980-08-01), Meece et al.

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