However, the poor efficiency of AC servo motors limits them to smaller loads.
Therefore, the use of 400 Hz components for aircraft applications, like moving control surfaces, saves size and weight.For example, a black-box within a radar encodes the distance to a target as a sine wave proportional voltage V, with the bearing angle as a shaft angle. The synchro receiver's function is to convert the electrical data supplied to its stator from the transmitter, back to a mechanical angular position through the movement of its rotor. The higher the resistance during starting, the higher the synchronizing torque for a pair of motors.If the starting resistors are removed, but the rotors still paralleled, there is no starting torque. This results in an absolute an alog angle that accurately reflects the rotor position and at no point through the shafts complete rotation is the same. This stator electrical angle may be displayed by sending it to an RX. At the receiver, the magnitude of the 1X channel's error determined whether the "fast" channel was to be used instead.
Differential synchros are another category. Output: electrical output from rotor (proportional to sine of the difference between rotor angular position and electrical input angle. Many synchros operate on 30 to 60 V AC also. Once the receiver servo settled, the fine channel normally retained control.
A synchro torque transmitter may be substituted for a torque receiver.Remote position sensing is the main synchro application. ... A synchro receiver, TR, is zeroed if, when. a shaft position. This is the fine electrical zero position of the synchro. They are as follows:On a practical level, synchros resemble motors, in that there is a rotor, stator, and a shaft. In simpler terms, a control synchro system is a system in which the transmitted signal controls a source of power which does the usable work. When the transmitter’s shaft is turned, the synchro receiver’s shaft turns such that its "electrical position" is the same as the transmitter’s. The CT compares the commanded to the actual position and signals the servo amplifier to drive the motor until that commanded angle is achieved.When the control transformer rotor detects a null at 90When it measures a minimum or null, the servo has driven the antenna and control transformer rotor to the commanded position. Different makes of selsyns, used in interlock systems, have different output voltages. The servo system will cause the servo motor to drive the antenna to the commanded position. Start studying Servo Systems. Heavy loads are more efficiently driven by large DC servo motors.Airborne applications use 400Hz components– TX, CT, and servo motor.
The safest approach is to bus the five or six lines from transmitters and receivers at a common point. The angle output is a torque on the TDR shaft. Though we show three-phase rotors above, a single-phase powered rotor is sufficient as shown in the figure below.Should one rotor be displaced from the other, the stator phase voltages will differ between transmitter and receiver. The bearing angle shaft is coupled to the resolver shaft. Synchro systems were first used in the control system of the Smaller synchros are still used to remotely drive indicator gauges and as rotary position sensors for aircraft control surfaces, where the reliability of these rugged devices is needed. If this is the case, recheck the transmitter for electrical zero. For two-speed systems, these do not require gearing between the shafts. The torque output angular difference is TR.The torque inputs are TX and TDX. Torque receiver-transmitter (TRX) This synchro was designed as a torque receiver, but may be used as either a transmitter or receiver. In all cases, three-phase systems will handle more power and operate a bit more smoothly. Convert to X and Y coordinates. There is no error between measured and commanded position, no CT output to be amplified.The servo motor may drive a reduction gear train and be large compared to the TX and CT synchros. Control differential transmitter .
If one rotor is moved through an angle θ, the other selsyn shaft will move through an angle θ. Either the transmitter or receiver shaft may be rotated to turn the opposite unit.Synchro stators are wound with 3-phase windings brought out to external terminals. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A differential receiver is connected between two transmitters, and shows the sum (or difference, again as defined) between the shaft positions of the two transmitters. What this means is that when the transmitter is turned to electrical zero, the synchro receiver also turns to zero. Control type synchros are used in applications that require large torques or high accuracy such as follow-up links and error detectors in servo, automatic control systems (such as an autopilot system).
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