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Lab 7

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Submitted By ep092657
Words 435
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Instruction
Worksheet 1 of 3

Synchronous Motor
Load Characteristic n, IL, cos φ, Pout, η = f(M)

Objective / Outcome:



To recognise the synchronous motor operation.
To determine the load characteristics of a synchronous motor.

Procedure:
1. Establish the connections according to the diagram below.

Experiment 7.1

Instruction
Worksheet 2 of 3

Synchronous Motor
Load Characteristic n, IL, cos φ, Pout, η = f(M)

Experiment 7.1

2. Turn on the DC power supply and adjust the value of the rated excitation current according to the machine name plate. Then, start the motor by using the three phase
AC power supply.
3. Measure the speed, armature current, excitation current, power factor and input power from 0 N.m until 2.5 N.m, including the rated torque/load value of 1.72 N.m.
4. Then, calculate the output power, reactive power and efficiency based on the measurements. 5. Represent the speed, armature current, power factor, output power and efficiency as functions of torque/load in a single graph and indicate the rated load on the graph.
Analysis and Discussions
Provide analysis and discussions based on the graph.

Instruction
Worksheet 3 of 3

Synchronous Motor
Load Characteristic n, IL, cos φ, Pout, η = f(M)

Experiment 7.2

Objective / Outcome:
To determine the load characteristics of a synchronous motor at constant power factor, cos
 = 1.
Procedure:
1. Establish the connections according to the previous diagram.
2. Apply the rated excitation current and start the motor by using the three phase switch.
3. With cos φ = 1, measure the speed, armature current, excitation current and input power from 0 N.m until 2.5 N.m, including the rated torque/load value of 1.72 N.m.
TIPS:
Since it is difficult to obtain the exact value of cos φ = 1, adjust the excitation current until the power factor swinging consistently between ‘cap’ and ‘ind’ digital indicator
ATTENTION:
Conduct the measurements accordingly to ensure safety. If the machine starts to vibrate or behaving unusually when the torque/load increases, increase the excitation current (limited to 5A) to achieve cos φ = 1 or until the machine stops vibrating or behaving unusually. If the problem persists, decrease the torque/load or deacivate the pendulum. 4. Then, calculate the total output power and efficiency based on the measurements.
5. Represent the excitation current, speed, armature current, output power and efficiency as functions of torque/load in a single graph and indicate the rated load on the graph.
Analysis and Discussions
Provide analysis and discussions based on the graph.
Conclusion
Provide comprehensive conclusion for these experiments.

- End of Experiment -

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