DS-11G

Function of the DS-11G precession angle sensor

The main function of DS-11G is accurate measurement of gyro precession angle without adding mechanical friction to the gyroscopic unit. The sensor detects the relative angular position between the rotor and stator and forms an output signal proportional to the mismatch angle. This signal is then used by follow-up systems, attitude and heading equipment, autopilot channels or checking equipment. The contactless design allows the sensor to operate in sensitive aircraft gyroscopic mechanisms where even small friction moments can reduce accuracy.

DS-11G construction and bearingless mounting

The distinguishing feature of DS-11G is its embedded bearingless construction. The rotor has no separate bearing shields and is mounted directly on the gyro precession axis. The stator is installed in the bore of the gyro frame or instrument body. This arrangement removes brushes, slip rings and separate sensor bearings from the measuring path. As a result, the sensor does not create noticeable parasitic friction torque and does not interfere with the mechanical accuracy of the gyro suspension.

Operating principle of DS-11G

DS-11G operates as an induction rotary transformer. The rotor carries a single-phase excitation winding supplied by AC voltage. The stator contains three synchronization windings arranged at 120 degrees and connected in a star circuit, according to the source context. When excitation is applied, a pulsating magnetic flux is created. As the rotor turns relative to the stator, different EMF values are induced in the stator windings. The receiving circuit evaluates these voltages and determines the angular mismatch or precession angle.

Application of DS-11G on aircraft equipment

DS-11G is used inside aircraft electromechanical and gyroscopic instruments. The source context indicates use on Mi-8 family helicopters, including Mi-8T, Mi-8MTV and Mi-17, depending on installed avionics. The sensor may be used in heading systems such as GMK-1AE, aircraft attitude indicators, gyro-vertical units and follow-up systems. It can be installed on gyro precession axes, roll and pitch axes of attitude equipment, or feedback circuits where angular measurement must be made without mechanical drag.

Ordering and replacement of DS-11G

When ordering DS-11G, it is important to confirm that the requirement is specifically for the “G” modification, because it differs from other DS-11 versions by its embedded bearingless mounting. The buyer should specify the exact aircraft unit or gyro instrument, required condition, documentation and test status. For maintenance work, additional data may be needed, including winding continuity values, zero adjustment procedure, connector or terminal layout, and rotor / stator mounting dimensions for the gyro frame.