The difficulty in starting the hollow cup motor may be caused by a variety of reasons, which cover many aspects such as power supply, mechanical components, internal wiring and working environment. Here are some possible reasons and a brief analysis:

A. Power supply problem:

Poor power connection: Check whether the power connection of the motor is firm and whether there is a break or short circuit.

Power supply voltage instability: Use a multimeter to measure whether the power supply voltage is within the rated range. Voltage fluctuations may cause difficulty in starting the motor.

⒉ Mechanical component failure:

Bearing wear: bearing is a key component supporting the rotation of the rotor, if the wear is serious, it will affect the normal operation of the rotor, resulting in start-up difficulties.

Gear damage: If there is a gear drive mechanism inside the motor, gear damage may also lead to poor starting.

Foreign body stuck: There may be foreign body stuck inside the motor, such as dust, metal debris, etc., which will hinder the rotation of the rotor.

C. Internal wiring problems:

Line damage: The line inside the motor may be damaged due to aging, short circuit or open circuit, resulting in the normal flow of current, which affects the start.

Poor contact: Terminals or connection points inside the motor may be loose or corroded, resulting in poor contact, which can affect current transmission.

Brush and commutator problems:

Brush wear: The brush is a key part of the motor to transfer current, if the wear is serious, it will lead to poor contact or poor current transmission, which affects the start.

The surface of the commutator is uneven: If the surface of the commutator is worn or uneven, it will also affect brush contact and current transmission.

5. Heat dissipation problem:

Poor heat dissipation: If the motor runs for a long time or the working environment temperature is too high, it may cause poor heat dissipation, so that the internal temperature of the motor is too high, and then affect the starting performance.

Heavy load:

If the load on the motor exceeds its rated load capacity, it may also cause difficulty or inability to start.

In view of the above possible causes, the following measures can be taken for investigation and maintenance:

· Check the power connection and voltage stability.

· Disassemble the motor, check the wear of bearing, gear and other mechanical parts, and clean up the internal foreign matter.

· Use a multimeter to check the on-off and contact conditions of the internal lines.

· Check brush and commutator wear and make necessary replacement or repair.

· Ensure that the heat dissipation channel of the motor is unimpeded and improve the working ambient temperature.

· Reduce the load on the motor or upgrade the motor to accommodate greater load requirements.

Please note that when performing maintenance and troubleshooting, it is important to ensure that the power supply is completely disconnected and that the relevant safe operating procedures are followed. If the problem is more complex or cannot be resolved on its own, it is recommended to seek professional help.