Synchronous Motor and Controller Maintenance

Topic I: Synchronous Motor Principles Part 1   In this lesson you will learn to:   Define synchronous speed. Explain how amortisseur bars can be used to bring a synchronous motor up to synchronous speed. Describe how the rotor of a synchronous motor locks in with the stators rotating magnetic field.   Topic II: Synchronous Motor Principles Part 2   In this lesson you will learn to:   Describe the effect of load on a synchronous motor. Describe the effect of varying the rotors electro-magnetic field. Define power factor. Explain how power factor adjustment of a synchronous motor can improve the overall electrical efficiency of an industrial operation.   Topic III: Field Control of Synchronous Motors   In this lesson you will learn to:   Define field control. Describe three problems associated with field control. Identify magnetic field controllers and state their main function. State the function of a field frequency relay in a magnetic field controller and describe its operation. State the function of a field loss relay in a magnetic field controller and describe its operation.   Topic IV: Preventive Maintenance   In this lesson you will learn to:   List the items to be inspected on an operating synchronous motor. Describe or demonstrate how to test a synchronous motor to verify that it is de-energized. List the items to be inspected on a synchronous motor that is not operating. Describe or demonstrate an insulation test on both a rotor and a stator of a synchronous motor. Describe or demonstrate how to test a synchronous motor controller to verify that it is completely de-energized. List the items to inspect on a synchronous motor controller.   Topic V: Controller and Motor Testing   In this lesson you will learn to:   Describe or demonstrate how to test a de-energized controller for grounds. Describe or demonstrate how to test a de-energized controller for opens and shorts. Describe or demonstrate how to test both the rotor and the stator of a synchronous motor for grounds. Describe or demonstrate how to test both the rotor and the stator of a synchronous motor for opens and shorts.