TACHOMETRIC CONTROLS

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Permanent Magnet DC Motors

REGULAR MAINTENANCE :

Storage : Store in cool dry place away from any hazardous atmosphere, oil, mist, vapor etc.
2. Commutator : Keep clean & protect from carbon deposition, dirt, any Other depositions like water etc. Cleaning by dry cloth / thermacol (dry) piece. Check excessive wear out of commutator.
Brushes : Regular / periodic checking of brushes. Replace brushes after 60 % consumption of its length.
Bearings : Check for smooth running

TROUBLE SHOOTING (PMDC MOTOR) :

Problem faced	Area concerned	Corrective action
Motor doesn’t run on applying voltage	Armature Brush Drive setting & Connections	Check armature resistance for continuity. Check brush contact with commutator. Check drive setting & connecting wires
Variation in output speed / torque from motor	Armature Demagnetization	Check seating of brush, replace if necessary. Check / Clean commutator Check armature for short / open windings.Magnetize body
Motor mechanically jammed	Bearing Other component	Check for bearing jam, replace if necessary.
Lateral Play in shaft	Bearing Bearing housing	Check for bearing status Check bearing housing flange / end cover replacement may be required
Irregular / Undesired sound from motor	Origin of sound Bearing	Remove foreign material present inside, if anyDamaged bearings
Motor gets heated up.	Load Armature	Remove overload or use bigger capacity motor. Check armature
Breakage or Bending of shaft	Shaft	Replace armature / motor
Sparking in commutator	Load Brushes	Remove overload Adjust brush setting Magnetization needed
Jerks at shaft	Drive Brushes	Check drive setting Adjust brush seating
Physical Damage of any kind		Replace concerned part

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