Motor

Motor Trouble Shooting Guide

Problem Possible Cause Possible Solution
Motor does not start Supply lead interrupted Check connections
Setting of brush yoke wrong Adjust neutral zone
Current limiting does not respond Loading too high or increase current limiting
Brake does not release Check brake connection
Motor speed drops when under load Overloading Carry out performance measurement
Voltage drops Adjust neutral zone
Setting of brush yoke wrong Adjust neutral zone
Motor gets too hot Overloading Carry out performance measurement
Insufficient cooling Ensure that the cooling air can enter without hindrance
Separately driven fan not running Check connection of separately driven fan
Current ripple too great Check form factor, if necessary connect armature choke on input side
Ambient temperature too high Reduce performance
Severe brush sparking Overloading Carry out performance measurement
Setting of brush yoke wrong Adjust neutral zone
Commutator surface very dirty Clean commutator
Commutator out-of-round or with flat points Have commutator diameter-turned by specialists
Lamellar insulation protruding Have specialists scrape out of insulation grooves and remove sharp edges
Brushes worn out Insert new brushes
Current ripple too great Check form factor, if necessary connect armature choke on input side
Switching error in a section of coil Have experts carry out checking
Carbon brush sticks in holder Ensure easy running
Vibration on the drive Remove possible unbalance
Unsuitable brush quality Consult the manufacturer, stating the Trouble Shooting data and environmental factors
Damage to coil Get damage removed by specialists
Brush life too short Current ripple too great Check form factor
Connect armature choke on input side
Overloading Carry out performance measurement
Current loading of carbon brush too low Use genuine carbon brushes
Commutator surface affected Find out the causes (dust, oil fumes, chemical active gases etc) and remove it
Brushes are of different or unsuitable qualities Fit the machines with suitable brushes of consistent quality. Use genuine carbon brushes
Motor produces too much noise Current ripple too great Check form factor. Connect armature choke on input side
Bearings warped, dirty or damaged Realing the motor. Clean and grease the bearings or replace them
Rotating parts unbalanced Remove stimulation of vibration and possible armature unbalance
Current convertor vibrates Optimize current converter
Speed is unstable Current convertor not set ideally Optimize current converter
Large differences in loading Increase current limiting or use a more efficient device or motor
Tachometer signal not constant Check tachometer
Motor accelerates uncontrollably Error in speed feedback, e.g. tachometer connected wrongly Connect correct polarity
Tachometer carbon brushes worn-out Replace carbon brushes
Tachometer lead interrupted Lay a new tachometer lead