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The difficulty in starting a DC core motor (often referred to as a DC motor) can be caused by a variety of reasons. Here are some common reasons and their explanations:

First, power supply problems

The power supply voltage is too low: when the power supply voltage is lower than the rated voltage of the motor, the starting torque of the motor will be significantly reduced, resulting in start-up difficulties.

The power supply is not really connected: the power plug is not tightly inserted, the power cord is broken or the power switch is not closed, etc., may cause the motor to not receive enough power to start.

Second, the motor itself

Armature winding fault: armature winding break, short circuit or ground may cause the motor can not start normally. These failures may be caused by aging winding insulation, mechanical damage or wiring errors.

Poor contact between the commutator and the brush: the commutator surface is not clean, the brush is seriously worn or the brush spring pressure is insufficient, which may lead to poor contact between the brush and the commutator, thus affecting the starting performance of the motor.

Starting resistance problem: if the starting resistance of the motor is too large or too small, it may cause the starting current to be inappropriate, which affects the starting of the motor. Too small starting resistance may cause too much current to damage the motor, while too large starting resistance may cause insufficient starting torque.

Third, the load problem

Excessive load: If the load driven by the motor exceeds its rated load capacity, the motor will encounter difficulties when starting. At this point, you need to reduce the load or choose a more powerful motor.

4. Other factors

Bearing damage or stuck: bearing is an important part of the motor to bear the load and transfer torque, if the bearing is damaged or stuck, it will seriously affect the start and operation of the motor.

Poor lubrication: Poor lubrication of the internal parts of the motor may also lead to start-up difficulties. Therefore, the lubricating oil should be checked regularly and replaced or replaced.

5. Solutions

For the above reasons, the following solutions can be adopted:

Check the power supply voltage: ensure that the power supply voltage is within the rated voltage range of the motor.

Check the motor wiring: make sure that the motor wiring is correct, and the power has been really connected.

Check the armature winding and commutator: regularly check and clean the surface of the commutator, check whether the armature winding is intact, and repair or replace it if necessary.

Adjust the starting resistance: adjust the size of the starting resistance according to the actual situation of the motor to ensure that the starting current is appropriate.

5. Reduce the load: If the load is too heavy, the load should be appropriately reduced or a more powerful motor should be selected.

Check the bearing and lubrication: check and replace the bearing regularly to ensure that the internal parts of the motor are well lubricated.