Simple Steps To Electric Motor Maintenance

Mar 22, 2017
Simple Steps To Electric Motor Maintenance

Preventive Electric Motor Maintenance

A well-planned electric motor preventive maintenance programme is the key to dependable, long-life operation of electric motors.

Almost all electrical equipment requires planned inspection and maintenance being carrying out. This ensures electrical equipment is kept in good working condition at all times. This is critical for electric motors. Routine motor inspections should be carried out at scheduled times throughout the motor’s life. Periodic inspections prevent serious damage to machinery by locating potential problems.

Periodic Inspections

Motor rewinds and supplyElectric motor maintenance programmes aim to prevent critical breakdowns rather than repairing them. In plant operations, unscheduled stoppage of production or long repair shutdowns are intolerable. The resultant downtime eats deeply into production times. Periodic inspections of motors are necessary to ensure best operating results.

Preventative maintenance programmes require detailed checks, and all motors onsite should be given an ID number and have a record log. The motor records should identify the motor, brand, inspection dates and descriptions of repairs. By keeping records, the cause of any breakdowns can determine the fault and reduce on-going problems.

All maintenance programmes should refer to the manufacturer’s techincal documentation prior to performing checks.

There are simple routine and maintenance checks for three phase motors which can aid in and ensure a long life to a motor.  Simple checks would be reviewing the service history, noise and vibration inspections. This would also include visual inspections, windings tests, brush and commutator maintenance and bearings and lubrication.

Inspection and servicing should be systematic. The frequency of inspections and the degree of thoroughness may vary depending on such factors as the importance of the motor, it’s usage and the motor’s environment. An inspection schedule, therefore, must be flexible and adapted to the needs of each plant.

Simple checks and routine ac and dc motor maintenance

Frequent checks
  • 1. Clean motor of any dust or oil.
  • 2. Check oil rings turn with shaft.
  • 3. Check oil level in bearings.
  • 4. Visually check for oil and grease from bearings.
  • 5. Technician to examine the starter switch, fuses and tighten loose connections.
Every 6 months
  • 1. Clean motor, blowing out dirt from windings, and wipe commutator and brushes.
  • 2. Visually inspect commutator clamping ring.
  • 3. Check and replace brushes that are more than half worn.
  • 4. Examine brush holders, and clean them if dirty.
  • 5. Check brush pressure and position.
  • 6. Remove, clean out, and replace oil in sleeve bearings.
  • 7. Check grease in ball or roller bearings.
  • 8. Check operating speed or speeds.
  • 9. Technician to examine and tighten loose connections.
  • 10. Test current input and compare it with normal.
  • 11. Visually check drive, for smooth running, absence of vibration.
  • 12. Check motor foot bolts.
Annually
  • 1. Remove and renew grease in ball or roller bearing.
  • 2. Test insulation.
  • 3. Clean out magnetic dirt that may be attached to poles.
  • 4. Check clearance between shaft and journal boxes of sleeve bearing motors.
  • 5. Check the commutator for smoothness and slot damage.
  • 6. Examine connections of commutator and armature coils.
  • 7. Inspect armature bands.

How can we help?

Although many plants have motor management processes in place, there are still some facilities that don’t. Often, budget limitations are the problem. R Baker (Electrical) Ltd suggest that there are some simple steps that a plant can take to improve reliability without breaking the bank.

A risk analysis should be conducted on all operating motors to determine which machines are critical to plant operation. Once identified, baseline data should be collected to determine current condition and to identify if any immediate repairs are warranted.

From this, a motor management process can be put in place using the simple steps outlined above.

This is not always possible if you don’t have the techincal people in-house to carry this work out. This is where we can help. Our pump and motor rewind team are available 7 days a week; providing you with a peace of mind that we are ready for critical breakdown situations.

We plan and run maintenance programmes with a wide range of national businesses. Over the years we have developed and improved our motor department to deal with all imaginable customer needs. We repair and supply a large range of pumps to the rail, nuclear, universities and chemical industries, all of which require a unique service. With our highly skilled technical team, we have the ability to meet these requirements by supporting your management team.

Whether it is to start a motor maintenance strategy from scratch or to assist in solving a persistent problem, we can help. Our engineers are experienced in providing solutions for a wide variety of businesses and plant types. When combined with our other repair and maintenance services, this allows us to provide you with a complete solution. Read more about our services here.

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