Intermediate Motors

SKU: RVI-11507Duration: 20 Minutes

To achieve long motor life, it is necessary to understand the different causes of motor failures, and how to operate and maintain motors to prevent these early failures. This interactive online course covers best practices for performing maintenance for the long-term reliability of AC and DC motors used in facilities and addresses the proper procedures for troubleshooting. Proper use of the tools and equipment required for motor maintenance, such as winding testing, shaft alignment, and vibration monitoring/analysis, are also discussed.

Course Details


Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Demonstrate intermediate motor maintenance principles
  • Explain how megohmmeters are used for maintenance
  • Recognize single and three phase motors
  • Describe a Motor Control Center and its purpose
  • Execute proper alignment of motor drive systems

Key Questions

The following key questions are answered in this module:

What is a good practice for monitoring AC motor conditions?
Establishing a checklist for periodic visual checks is a good practice for monitoring AC motors condition.

What is a megohmmeter?
A megohmmeter is a special type of equipment used to test the electrical resistance of insulation.

What are the two types of AC motors?
Single phase and three phase motors are two different types of AC motors.

What is a motor control center (MCC)?
A motor control center (MCC) is an assembly to control some or all electric motors in a central location.

What is the most common thickener or base used in today's electric motor bearings?
The most common thickener used in today's electric motor bearings is a polyurea base.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

DC motor maintenance includes the items discussed for AC motors plus maintenance of DC motor brushes and commutator. The brushes and commutator are integral to the normal operation of a DC motor. The brushes ride on the rotating commutator of the armature and there should be little brush noise, chatter, or sparking when the motor is operating. Excessive brush wear or chipping are signs that the motor is not commutating properly. With the motor de-energized, rotate the armature by hand to see if the brushes are free to ride on the commutator, and that there is adequate spring tension to keep them hugging the commutator. A good brush should have a polished surface that indicates that it has been seated properly. Brush connections should be checked to ensure they are tight and clean. Examine brushes to determine if they are aligned properly. Misalignment can cause sparking. The brushes should have equidistant spacing around the commutator and parallel to the bars. Clean any debris around the brushes. Compare the brushes to a new set to gauge the amount of wear. The commutator should have a smooth, polished, brown appearance. There should be no grooves, scratches, or scores. If the commutator is blackened or has rough areas, it is probably caused by brush sparking. Carbon dust and debris from the brushes can cause sparking and cause damage the commutator. The commutator should be cleaned using a brush (fiberglass) and electric motor cleaner. After cleaning, motor should be blown out with dry compressed air to ensure it is clean and dry.
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