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Fill in the answers to questions 1 through 9.State two important applications for three-phase synchronous motors.____________________________________________________________________________________________________________________________________
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The question is asking for two important applications for three-phase synchronous motors. Step 2: Recall the characteristics of three-phase synchronous motors. These motors operate at a constant speed and are used in applications where precise speed and position Show more…
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Unit 32 Practical Applications You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage induction motor. The supply voltage is 480 V. The power company has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 A. The motor nameplate is as follows: Phase: 3 Volts: 480 FLA: 352 RPM: 1755 Code: Frame: Will it be possible to start this motor across the line, or will it be necessary to use a reduced-voltage starter to reduce starting current? 2. You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V line. You discover that the nameplate has been painted and you cannot see the connection diagram. To make the proper connections, you must know if the motor stator winding is connected wye or delta. How could you determine this using an ohmmeter? Explain your answer. You are an electrician working in an industrial plant. A 30-hp three-phase squirrel-cage motor keeps tripping out on overload. The motor is connected to a 240-volt line. Voltage measurements indicate the following voltages between the different phases: A-B 276 volts, B-C 221 volts, and A-C 267 volts. Determine the percentage of heat rise in the winding with the highest current.
Part 1: Evaluation of Synchronous Machine Synchronous motor applications are required where precise speed or position control is needed. It is more suited for constant torque and constant speed drives. Unlike 3-phase induction motors, synchronous motors can be designed for the required torque, power factor, and starting VA requirement to suit a particular need. In this assignment, students are required to choose any one of the applications stated below and produce a technical report based on the selected application. Applications of Synchronous Motor: 1. Steel mills 2. Metal rolling mills 3. Rock mining mills 4. Ore crushers Mining Mills Questions: 1. Select any one application as mentioned above. 2. Write the introduction based on the selected application. 3. With the help of suitable illustrations, explain briefly the construction and working operation of the synchronous motor. 4. Provide various sketches, drawings, or pictures and various data (voltage, current, and power details) about the selected application with appropriate explanation. 5. Evaluate why the synchronous motor is the most suitable type of motor for the selected application compared to other types of motors. Justify your answer with appropriate explanation. 6. Identify and explain the starting methods and speed control techniques for the selected application with the relevant sketches/drawings. 7. Write the conclusion. 8. References.
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