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DC Motor

4 Major Troubles in a DC Motor with Reasons

  • Categories DC Motor, Arduino, Electric Vehicles, Electrical Machines
dc motor troubles
DC motor fault zone analysis is a vital plan of any DC motor maintenance program. Several troubles may arise in a DC motor. A few of them are discussed below:
  1. Failure to start
  2. Sparking at brushes
  3. Vibrations and pounding noises
  4. Overheating of DC Motor

Table of Contents

  • Reasons for Failure to start
  • Reasons for Sparking at brushes
  • Reasons for Vibrations and pounding noises
  • Reasons for Overheating of DC Motor
    • Related Articles

Reasons for Failure to start

Failure to start may be due to the following reasons
  1. ground fault
  2. open or short-circuit fault
  3. wrong connections
  4. too low supply voltage
  5. frozen bearing
  6. excessive load.

Read: Working Principle of DC Motor

Reasons for Sparking at brushes

25

Sparking at brushes in a dc motor may be due to 
  1. troubles in brushes
  2. troubles in commutator
  3. troubles in armature
  4. excessive load.

Brush troubles may arise due to the insufficient contact surface, too short brush, too little spring tension or wrong brush setting.

Commutator troubles may be due to dirt on the commutator, high mica, rough surface or eccentricity.

Armature troubles may be due to an open armature coil. An open armature coil will cause sparking each time the open coil passes the brush. The location of this open coil is noticeable by a burnt line between segments connecting the coil.

Read: Armature Reaction in DC Motor

Reasons for Vibrations and pounding noises

Vibrations and pounding noises may be due to  
  1. worn bearings
  2. loose parts
  3. rotating parts hitting stationary parts
  4. armature unbalanced
  5. misalignment of machine
  6. loose coupling etc.

Reasons for Overheating of DC Motor

The overheating of dc motor may be due to 
  1. overloads
  2. sparking at the brushes 
  3. short-circuited armature or field coils
  4. too frequent starts or reversals
  5. poor ventilation
  6. incorrect voltage

Read: Testing of DC Machines 

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    1 Comment

  1. Marton
    December 18, 2018
    Reply

    Very nice stuffs

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