DS-11B

DS-11B contactless selsyn sensor for aircraft equipment

DS-11B is a contactless aircraft selsyn sensor used as an AC rotary transformer for measuring angular mismatch between two axes or gyro precession angle. The sensor belongs to the DS-11 family and is used in aviation and specialized industrial control systems. In aircraft applications, DS-11B is associated with gyroscopic systems, attitude and heading equipment, servo systems and onboard automatic control circuits.

Function of the DS-11B angle sensor

The main function of DS-11B is to convert mechanical angular displacement into an electrical signal. The sensor operates in transformer mode: when AC excitation is applied to the excitation winding, output voltages are induced in the synchronization windings. Their amplitude and phase depend on rotor position. This allows the connected system to detect angular mismatch, gyro frame movement or precession angle and transmit the data to a control, indication or follow-up circuit.

Contactless construction of DS-11B

DS-11B is a contactless selsyn, so it has no brushes, slip rings or sliding electrical contacts. This design reduces wear, eliminates sparking at the current-collection point and improves stability in vibration conditions. The absence of friction elements is especially important in aircraft gyroscopic equipment, where additional mechanical resistance can affect measurement accuracy. The sensor is intended for continuous operation as part of onboard or ground-based control and measuring systems.

Operating principle of the DS-11B sensor

In the basic DS-11 winding scheme, the unit has a single-phase rotor excitation winding and three stator synchronization windings arranged 120 degrees apart and connected in a star circuit. Depending on the specific installation, the winding arrangement and connection scheme may vary. As the rotor turns relative to the stator, the inductive coupling between the windings changes. The resulting output EMF on the stator windings is proportional to the angular mismatch and is used by the receiving equipment to determine the measured angle.

DS-11B use on Mi-8 / Mi-171 systems

DS-11B is used in aircraft equipment where small angular movements must be measured with stable electrical transmission. The source context indicates use on Mi-8 / Mi-171 family helicopters, including gyroscopic systems and flight-navigation equipment. Typical application areas include gyro-verticals, attitude and heading systems, control aggregates, servo mechanisms and test equipment. Since actual installation depends on the specific avionics set and aircraft modification, compatibility should be checked against the relevant equipment documentation.

Ordering and replacement of DS-11B

When ordering DS-11B, the exact designation, modification and technical conditions should be confirmed. DS-11B belongs to the wider DS-11 series, which also includes DS-11A, DS-11V and DS-11G. These versions may differ by electrical data, mechanical execution or installation method. For supply or maintenance, the buyer should specify whether a product passport, verification certificate, storage records or wiring diagram is required. It is also useful to confirm the receiving unit, indicator or gyro system where the sensor will be installed.

Product Type: Contactless selsyn sensor / AC rotary transformer
Designation: DS-11B
Alternative Designations: DS11B, DS-11Б, ДС-11Б, ДС11Б
Series: DS-11 selsyn sensor family
Function: Measurement of angular mismatch between two axes or gyro precession angle
Signal Role: Conversion of mechanical angular displacement into an electrical output signal
Operating Principle: Transformer mode with AC excitation and induced stator output EMF
Contact System: Contactless, without brushes and slip rings
Technical Conditions: 6Zh2.329.014TU / 6Ж2.329.014 ТУ
OKP Code: 754524002607, according to source context
Excitation Voltage: 12 V or 36 V AC depending on aircraft circuit and equipment configuration
Excitation Frequency: 400 Hz
Rotor Winding: Single-phase excitation winding, according to source context
Stator Winding: Three synchronization windings shifted by 120° and connected in star circuit, according to source context
Operating Mode: Transformer mode / angular mismatch sensor mode
Output Signal: AC EMF with amplitude and phase proportional to angular mismatch
Accuracy Requirement: High output voltage slope for detection of small angular deviations
Application / Where Used: Aircraft gyro-verticals, attitude and heading systems, control aggregates, servo systems and test equipment
Compatible Aircraft / Equipment: Mi-8 / Mi-171 family helicopters and other equipment depending on documentation
Related Modifications: DS-11A, DS-11V, DS-11G
Environmental Context: Aircraft vibration, temperature variation and onboard operating conditions
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, verification certificate, test report, storage records, wiring diagram 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.