Synchronous Data Transmission Systems
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What is the main purpose of the Basic Synchronous System components?

  • To control fluid flow
  • To measure temperature variations
  • To generate electrical signals
  • To indicate pressure and position (correct)

    • What is unique about the transmitter in the Basic Synchronous System?

  • It generates alternating current
  • It is made from a toroidal resistor tap at equal angles (correct)
  • It consists of a magnetic rotor
  • It uses a single wiper contact arm

    • What type of rotor is used in the receiver of the Basic Synchronous System?

  • A laminated wooden rotor
  • A toroidal rotor
  • A 2-pole permanent magnet rotor (correct)
  • A synchronous variable speed rotor

    • What type of winding configuration does the receiver use?

    <p>Star-connected 3-phase winding</p> Signup and view all the answers

    What type of motion is associated with the arrangement described in the Basic Synchronous System?

    <p>Rotary motion or toroidal arrangement</p> Signup and view all the answers

    What is the primary function of Torque synchros?

    <p>To transmit angular position by creating a torque</p> Signup and view all the answers

    Which group of AC synchronous systems focuses on control?

    <p>Group 2 - Control synchros</p> Signup and view all the answers

    In which application would Torque synchros primarily be used?

    <p>Positioning of dials and pointers</p> Signup and view all the answers

    What is a characteristic feature of the operation of the four main groups of AC synchronous systems?

    <p>They function under the same operational principle</p> Signup and view all the answers

    What is the simplest form of synchro mentioned in the content?

    <p>Torque synchro</p> Signup and view all the answers

    What is the primary purpose of the toroidal resistor in a Desynn system?

    <p>To create a magnetic field for torque generation</p> Signup and view all the answers

    What effect does applying DC to the tapping points in the TX have?

    <p>It results in different potentials at each tapping point.</p> Signup and view all the answers

    Which method is mentioned for reducing errors due to friction in the Slab Desynn system?

    <p>Burnishing the resistance wire surface</p> Signup and view all the answers

    What is the significance of changing sawtooth waveforms to sinusoidal waves in the Slab Desynn system?

    <p>It helps in reducing cyclic errors.</p> Signup and view all the answers

    What role does the pull-off magnet serve in a Desynn system?

    <p>It acts as a power-failure device.</p> Signup and view all the answers

    How does the construction of the Slab Desynn system differ from the basic Desynn system?

    <p>It winds the resistor on a slab former.</p> Signup and view all the answers

    Which component produces a magnetic field in the receiver stator of a Desynn system?

    <p>The coils supplied with current.</p> Signup and view all the answers

    What happens to the pointer of a Desynn system when the current to the stator is interrupted?

    <p>It moves to an off-scale position.</p> Signup and view all the answers

    What is the main function of a synchrotel?

    <p>To act as a low-torque control transformer or transmitter</p> Signup and view all the answers

    In a synchrotel, what is the composition of the rotor section?

    <p>A hollow cylindrical rotor made of aluminum, a fixed single-phase rotor winding, and a cylindrical core</p> Signup and view all the answers

    How does the rotor of a synchrotel affect the output voltage?

    <p>Its rotation changes the flux cutting into the rotor coil, thereby changing the output voltage</p> Signup and view all the answers

    What common feature do synchronous data transmission systems possess?

    <p>They consist of a transmitter and a receiver that actuate an output element</p> Signup and view all the answers

    What is the maintenance requirement for synchros installed in flight instrument systems?

    <p>They do not require any maintenance</p> Signup and view all the answers

    Who is authorized to perform calibration and repairs on defective synchros?

    <p>Only the manufacturer's qualified personnel</p> Signup and view all the answers

    What electrical element is used in a pressure-measuring application of a synchrotel?

    <p>A synchro control transmitter</p> Signup and view all the answers

    What is the typical output element actuated by synchronous data transmission systems?

    <p>A pointer</p> Signup and view all the answers

    What is the result of rotating the CX rotor in a control synchro?

    <p>The resultant flux in the CT stator is displaced by the same angle</p> Signup and view all the answers

    What factors affect the phase and magnitude of the induced error voltage in a control synchro?

    <p>The direction and degree of CX rotor displacement</p> Signup and view all the answers

    What is the primary role of the error voltage in a control synchro system?

    <p>To control the phase of the motor</p> Signup and view all the answers

    Which type of synchro is used to detect and transmit error signals representing two angular positions?

    <p>Torque Differential Synchro (TDX)</p> Signup and view all the answers

    How are the stator and rotor of a differential transmitter similar?

    <p>They are both identical in winding</p> Signup and view all the answers

    What is the main purpose of a resolver synchro (RS)?

    <p>To convert alternating voltages into shaft position and voltage</p> Signup and view all the answers

    What happens to the error voltage as the motor rotates in a control synchro system?

    <p>It is reduced until it reaches its 'electrical datum'</p> Signup and view all the answers

    What information can a differential synchro provide?

    <p>The difference or sum of two angular positions</p> Signup and view all the answers

    What occurs when the rotors are in different angular positions?

    <p>An unbalance (PD) occurs between the stator coil voltages.</p> Signup and view all the answers

    What is the main function of a Control Synchro?

    <p>Produce an error voltage signal.</p> Signup and view all the answers

    What happens when the NULL POSITION is reached in a synchro system?

    <p>No more torque is exerted on the rotor.</p> Signup and view all the answers

    What components make up a Control Synchro system?

    <p>Control Transmitter and Control Transformer.</p> Signup and view all the answers

    Which application is typical for Control Synchros?

    <p>Servo Altimeters and Airspeed indicators.</p> Signup and view all the answers

    How does a Control Synchro system achieve its electrical zero?

    <p>When the CT rotor is at 90° with respect to the CX rotor.</p> Signup and view all the answers

    What is the characteristic of a Torque Synchro compared to a Control Synchro?

    <p>It generates torque at the receiver.</p> Signup and view all the answers

    What is the role of the CT rotor in a Control Synchro system?

    <p>It detects the phase and magnitude of the error signal.</p> Signup and view all the answers

    Study Notes

    Synchronous Data Transmission Systems

    • Synchronous data transmission systems detect changes in measured qualities and transmit the information electrically to an indicating element.
    • These systems are divided into two categories: direct current (DC) and alternating current (AC).

    DC Synchronous Systems

    • There are three types of DC synchronous system:
      • Rotary motion (or toroidal resistance) for indicating positions and liquid contents
      • Linear motion (or micro desynn) for pressure indication
      • Slab desynn for pressure indication.

    Basic Synchronous System Components

    • The basic synchronous system consists of two units:

      • Transmitter
      • Receiver

    • The transmitter has a toroidal resistor and diametrically opposed wiper contact arms.

    • The receiver has a 2-pole permanent magnet rotor and a laminated soft-iron star-connected 3-phase stator

    • The operation of the basic synchronous system uses 28 V DC

    Principle of Operation of DC Synchronous System

    • When 28V DC is supplied, the different potentials at the 3 tapping points cause current to flow through the receiver stator coils and generate a magnetic field.

    • The combined magnetic field results in a torque to align the permanent magnet rotor of the receiver.

    • A pull-off magnet acts as a power failure device to attract the rotor causing the pointer to go to an off-scale position when the current to the stator is interrupted.

    Types of AC Synchronous Systems

    • There are four main groups of AC Synchronous systems according to their function
      • Torque synchros
      • Control synchros
      • Differential synchros
      • Resolver synchros

    Torque Synchro

    • The simplest form of a synchro

    • Used to transmit angular position through an induced signal which produces torque to reproduce positional information

    • Applications include flight instrument systems moving light loads such as pointers and dials etc

    • The torque synchro consists of two units, transmitter (TX) and receiver (TR)

    • Each consists of a rotor and stator

    • The rotor of the transmitter (TX) is mechanically coupled to an input shaft

    • The stator windings of both units are wired together by transmission lines

    Control Synchro

    • Control synchros produce an error voltage signal in the receiver element; torque is generated at the receiver
    • Used for moving large loads
    • Used in applications like servo altimeters, airspeed indicators where it operates in conjunction with central air data computers.
    • Control synchros consist of two units, Control Transmitter (TX) and Control Transformer (CT)

    Differential Synchro

    • Used for detecting and transmitting error signals
    • Represents two angular positions to indicate the difference or sum of the two
    • This type can be Torque Differential Synchro (TDX) and Control Differential Synchro (CDX)

    Resolver Synchro

    • Converts alternating voltages into shaft positional and voltage
    • Represents polar coordinates of a point
    • Used in flight director systems, integrated systems.

    Synchrotel

    • Used as a pressure measuring device in applications

    • A pressure-measuring application, the synchrotel is electrically connected to a synchro control transmitter

    • Its rotor is designed to follow the synchrotel rotor position

    • Acts as a servo loop system

    Maintenance and calibration of Synchros

    • Synchros in flight instrument systems do not require any maintenance
    • Systems normally require replacement or lubrication only when the unit is removed for repair or during a complete overhaul
    • Adjustments, repair or overhaul of defective synchros may only be done by qualified personnel.

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    Synchronous Data Transmission Systems PDF

    Description

    Explore the fundamentals of synchronous data transmission systems, focusing on both DC and AC categories. Learn about the various types of DC synchronous systems and their basic components, including transmitters and receivers. This quiz will evaluate your understanding of the principles and operations behind these systems.

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