Abstract: The moving drive portion of the force motor for an electromechanical servovalve is mechanicalkly constrained by slide bearing located on either side of the moving part to prevent it from rubbing against nonmoving parts, in turn, causing early failure and reliability problems. The connection between the force motor and the servovalve is adjustable to allow both the force motor to be electrically centered and the servovalve to be mechanically centered.

Abstract: A circuit and method of paralleling power transistors connected as a Darlington circuit or device for use with electric motor controls. The circuit is comprised of a plurality of Darlington devices having a drive circuit from a motor controller connected to a common base connection and a plurality of active pull-down circuits for reducing the rise and fall times and effectively controlling the storage times of the power transistors. The active pull-down circuits are capacity coupled to an inverted drive signal to synchronize the turn-off time and speed-up discharge of storage in the power transistor circuit.