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- Synchro transmitter-receiver
pair with calibrated dials
- Locking system for receiver
rotor
- Receiver use as control
transformer
- Built-in balanced demodulator
circuit
- Panel meter for ac/dc
voltages
- All internal power from the 220
V/50 Hz mains
- Only an external CRO required
Experiments
- Basic characteristics study - stator
voltages as a function of the rotor angle using the built-in
ac voltmeter. This shows the space variation of the three
voltages, VS1S2, VS2S3, and VS3S1, causing rotation of the
resultant magnetization in the stator which is fundamental
to the error detection process.
- Operation and error study of the
transmitter-receiver pair as a simple open loop position
control at a very low torque. This is a rarely used
application but is used to demonstrate the direction of the
resultant magnetic field in the receiver.
- Plotting the error voltage output as a
function of the transmitter rotor angle with the receiver
rotor locked. Observing the 180? phase reversal around the
zero error is significant as this the basic method through
which the direction of the error is detected in an ac system
- Use of balanced demodulator to develop dc
error signal with appropriate polarity and compare it with
the ac error. This block would be needed if a mixed system
were to be designed using both dc and ac components.
Typical Results
- The plot of the three stator
voltages, VS1S2, VS2S3, and
VS3S1 as a function of rotor angle are usually
shown as
It should be of interest to visualize why
the ac voltages are also plotted as negative values!
- The error voltage plot is of the
form as under
Observe that the input-output
characteristics of the synchre error detector is dintinctly
non-linear. How is it used in a linear system should be of
interest.
Schematic Diagram
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