| 摘要 |
<p>923,839. Fluid-pressure servomotor control systems. MOOG SERVOCONTROLS Inc. Nov. 11, 1960 [Nov. 13, 1959], No. 38858/60. Class 135. An electrically-operated servo-control valve comprises a polarized electrical force motor having spaced pole-pieces 49, 50 and an armature movable between the pieces. A control valve member 43, in the form of a flapper, is rigidly fixed to the armature and co-operates with nozzles 41, 42, the armature-flapper assembly being supported for pivotal movement by a resilient sleeve 48 secured at one end to the housing and at its other end to the assembly. Movement of the assembly in response to an electrical signal causes a pressure difference in two chambers 36, 40 to act on a spool valve 12 controlling a power device 29. A feedback spring 73 is provided fixedly connected at one end to the armature-flapper assembly and having a spherical part at the other end received in a groove in the centre of the spool. The spherical end ensures rolling movement between the spring and the spool and provides a loading on the flapper, with movements of the spool, to balance the electrical force of the motor whereby movement of the spool corresponds to the electrical signal. Movement of the power device may also provide an electrical feedback to the motor.</p> |
