DS-11A

DS-11A contactless selsyn sensor for aircraft equipment

DS-11A is an aircraft contactless selsyn sensor used as an AC electric micromachine for measuring and transmitting angular position over distance. The sensor belongs to the DS-11 series and is used in aircraft automation, control and measurement systems. In aviation technical property context, DS-11A is associated with onboard equipment of Mi-8 family helicopters, depending on the specific unit, system configuration and maintenance documentation.

Function of the DS-11A angle transmitter

The main function of DS-11A is to convert shaft rotation angle into an electrical signal that can be transmitted to a remote receiver, indicator or control unit. The sensor can be used in paired operation with a selsyn receiver, position indicator or angle-to-code converter. This allows aircraft systems to transmit angular displacement from one mechanical point to another without a direct mechanical linkage. In practical use, DS-11A can support position indication, automatic control circuits, checking equipment and gyroscopic system interfaces.

Contactless DS-11A construction

DS-11A is a contactless selsyn, meaning it has no sliding brushes or slip rings. This construction reduces wear, eliminates sparking at sliding contacts and improves reliability under aircraft vibration. The sensor includes a single-phase rotor excitation winding and three stator synchronization windings shifted by 120 degrees and connected in a star circuit, according to the source context. This winding arrangement forms a three-phase output signal whose amplitudes depend on rotor angle.

Operating principle of the DS-11A sensor

When AC excitation voltage is applied to the rotor winding, a pulsating magnetic flux is created inside the sensor. As the rotor turns relative to the stator, the magnetic coupling between windings changes. This induces different phase voltages in the stator windings. The receiving device compares the resulting voltages and determines the angular position of the rotor. The output signal is proportional to angular mismatch and can be used for indication, servo control or conversion into coded angular data.

DS-11A within the DS-11 modification family

The DS-11 series includes DS-11A, DS-11B, DS-11V and DS-11G modifications. DS-11A is treated as a standard or modified aircraft control sensor within this family. Other versions may differ by mechanical design, mounting arrangement or operating role. DS-11G, for example, is described in the source context as a special precession angle sensor operating in transformer mode without bearing shields, intended for direct installation in gyro mechanisms. Therefore, the exact letter suffix must be checked before replacement.

Ordering and replacement of DS-11A

When ordering DS-11A, the buyer should confirm the exact modification, technical conditions, condition category and documentation package. It is also important to specify the system or unit where the sensor will be installed, such as aircraft position indication, automatic control equipment or a gyroscopic system. For aviation supply, typical requirements may include first category condition, storage records, product passport and test confirmation. Electrical compatibility, winding diagram and connection data should be verified before installation.

Product Type: Contactless selsyn sensor / AC rotary transformer
Designation: DS-11A
Alternative Designations: DS11A, DS-11a, DS-11А, ДС-11А, ДС-11а, ДС11А
Series: DS-11 selsyn sensor family
Function: Measurement and remote transmission of shaft rotation angle
Signal Role: Conversion of mechanical angular position into electrical output signals
Operating Principle: Contactless selsyn operation in transformer mode
Contact System: Contactless, without brushes and slip rings
Technical Conditions: 6Zh2.329.014TU / 6Ж2.329.014ТУ
Excitation Voltage: 36 V AC
Excitation Frequency: 400 Hz
Maximum Output Voltage: Approximately 30 V on synchronization windings, according to source context
Rotor Winding: Single-phase excitation winding
Stator Winding: Three synchronization windings shifted by 120° and connected in star circuit
Operating Mode: Sensor mode, usually with selsyn receiver or angle-to-code converter
Transmission Error Reference: Not more than ±15′ to ±30′ depending on accuracy class and series, according to source context
Operating Temperature Range: −60 °C to +80 °C, according to source context
Weight: Not more than 0.25 kg, according to source context
Application / Where Used: Aircraft automation, control, indication and measuring equipment
Compatible Aircraft / Equipment: Mi-8 family helicopters and other aircraft equipment depending on documentation
Related Modifications: DS-11, DS-11B, DS-11V, DS-11G
Associated Equipment: Selsyn receivers, position indicators, angle-to-code converters, aircraft control systems and gyroscopic equipment
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, test report, storage records, winding diagram and equipment documentation if available

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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.