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Analysis of abnormal operation of DC motor


stay DC motor In the application of DC motor, there may be different problems. How to solve these problems becomes the difficulty. Tianfu micromotor makes a simple solution to the common problems of DC motor.



1. Abnormal operation sound of DC motor


Rotor rubbing with stator insulation paper or slot wedge: the slot wedge can be cut down by trimming insulation;


Bearing wear or sand and other foreign matters in the oil: replace the bearing or clean the bearing;


Loose stator and rotor iron cores: repair stator and rotor cores;


Bearing oil shortage: add grease and clean air duct;


Air duct packing or fan hood: re installation;


When the iron core is small, the scratch marks of stator and rotor should be eliminated;


Power supply voltage is too high or unbalanced: check and adjust the power supply voltage;


Stator winding wrong connection or short circuit: eliminate stator winding fault.


 Micro DC motor


2. The vibration of DC motor is large when it is running


Wear bearing clearance is too large: maintenance bearing, if necessary, replace;


Uneven air gap: adjust the air gap to make it uniform;


Rotor unbalance: correct rotor dynamic balance;


Straightening shaft: bending shaft;


Deformation or looseness of iron core: correct overlapping iron core;


If the center of coupling (belt pulley) is not corrected, it shall be corrected again to meet the requirements;


Fan imbalance: repair the fan, correct the balance, correct its geometry;


Insufficient strength of casing or foundation: reinforcement;


The foundation screw of micro motor is loose: tighten the foundation screw;



3. The DC motor can't rotate with thick power on, without abnormal sound, peculiar smell and smoke


Power failure: check the power circuit switch, fuse, junction box for breakpoint repair;


Fuse fusing: check the fuse model and cause, and replace the fuse;


Over current relay too small: adjust relay setting value to match with DC motor;


Wiring error correction: wiring control.


 Micro reduction motor


4. The DC motor does not rotate after being electrified, and the rear fuse is burnt out


Lack of phase of power supply or reverse connection of one coil: check whether one phase of knife switch is not closed well, but one phase of power circuit is broken to eliminate reverse connection fault;


Phase to phase short circuit of stator winding: find out the short circuit point and repair it;


Stator winding grounding: eliminate grounding;


Stator winding wiring error: find out the wrong connection and correct it;


Fuse section is too small: replace fuse;


Short circuit or grounding of power line: eliminate grounding point.


 DC reduction motor

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5. After the DC motor is powered on, there is a buzzing sound, but it does not rotate


Open circuit of winding or power shortage of one phase of power supply: find out the breakpoint and repair it;


Wrong connection of winding lead or internal connection of winding: check the polarity of winding; judge whether the end of winding is correct;


Loose contact points of power supply circuit and high contact resistance: tighten the loose wiring screws and use a multimeter to judge whether the connectors are false connected and repair them;


If the load of DC motor is too large or the rotor is stuck: reduce the load or find out and eliminate the mechanical fault;


The power supply voltage is too low: check that the power supply wire is too thin to make the voltage drop too large, and correct it;


Micro motor assembly is too tight or bearing grease failure: re assembly; replacement of grease;


Bearing stuck: repair the bearing.



The above are some common problems in the use of DC motor. For more information about micro DC motor, please continue to pay attention to Tianfu micro motor.

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