DS-11G

DS-11G contactless selsyn sensor for gyro systems

DS-11G is an aircraft contactless selsyn sensor used as a precession angle sensor in gyroscopic instruments and onboard automatic systems. The sensor works in transformer mode and measures angular mismatch between two axes. It converts small mechanical angular displacement into an electrical signal that can be transmitted to a servo circuit, indicator, automatic control unit or navigation system. DS-11G belongs to the DS-11 family of aircraft selsyn sensors manufactured according to 6Zh2.329.014 technical conditions.

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.

Product Type: Contactless selsyn sensor / precession angle sensor
Designation: DS-11G
Alternative Designations: DS11G, DS-11Г, ДС-11Г, ДС11Г
Series: DS-11 selsyn sensor family
Function: Measurement of angular mismatch between two axes or gyro precession angle
Signal Role: Conversion of small angular displacement into an electrical output signal
Operating Principle: Transformer mode with AC excitation and induced stator EMF
Contact System: Contactless, without brushes and slip rings
Technical Conditions: 6Zh2.329.014 TU / 6Ж2.329.014 ТУ
Excitation Voltage: 36 V AC, according to source context
Excitation Frequency: 400 Hz
Rotor Winding: Single-phase excitation winding
Stator Winding: Three synchronization windings shifted by 120° and connected in star circuit
Mounting Type: Embedded bearingless mounting inside gyro instrument
Rotor Mounting: Directly on the gyro precession axis
Stator Mounting: In the bore of the gyro frame or instrument body
Parasitic Torque: Practically zero due to absence of sensor bearings and sliding contacts, according to source context
Operating Mode: Transformer mode / precession angle sensor mode
Output Signal: AC EMF proportional to rotor angular displacement relative to stator
Application / Where Used: Aircraft gyroscopic systems, attitude indicators, heading systems, servo systems and automatic control equipment
Compatible Aircraft / Equipment: Mi-8, Mi-8T, Mi-8MTV, Mi-17 and other aircraft equipment depending on documentation
Associated Systems: GMK-1AE heading system, gyro-vertical units, aircraft attitude indicators and autopilot feedback circuits according to source context
Related Modifications: DS-11A, DS-11B, DS-11V
Environmental Context: Aircraft vibration, shock loads and onboard operating conditions
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, test report, storage records, winding diagram, zero adjustment data and equipment documentation if available

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.