The solenoid force is controlled by the change in current I in the lorce-controlled solenoid without the armature of the solenoid performing a measurable stroke.
Due to current feedback in the electrical amplifier, the solenoid current and therefore the solenoid force are kept constant even if resistance changes.
The main feature of the force-controlled proportional solenoids is the characteristic force-stroke curve.
The solenoid force remains constant over a defined stroke range at constant current.
The stroke for the solenoid shown in this example is approx. 1 5 mm. The solenoid is used in this range.
The force-controlled solenoid is of compact design due to the short stroke. In view of this short stroke, the force-controlled solenoid is used particularly for pilot-operated proportional directional and pressure control valves with the solenoid force being converted Into hydraulic force. The proportional solenoid is a controllable “wet pin” DC linear solenoid contained in an oil bath.