Eight causes of hub motor heating

The wheel motor will become hot during a long time operation, so what are the causes of the heat in the wheel motor? Today we will analyze the causes

1. Wheel motor overload

Since the motor load power is basically constant, when the voltage exceeds the rated value by more than 10%, the magnetic field strength of the stator and rotor will increase, which will cause the motor to run overloaded. In addition, the bearings of the motor may be damaged, increasing the load on the motor and causing the temperature of the hub motor to rise.

2. Problems with the motor wiring system

The welding of the wheel motor leads to this wire, the connection of the lead wire to the terminal, the diameter of the lead wire core, and other factors may cause the wiring system to heat up and affect the temperature of the wheel motor windings, which in turn causes the motor to heat up. When such problems are more serious, the motor may quickly appear local burn, and may even spread directly to the stator winding.

3.rotor defects lead to heat

This problem mainly affects wheel motors with relatively large power and long rotors, and is caused by casting defects in the motor rotor itself, such as rotor guide bars that are too thin or fractured. Due to these defects, the rotor becomes very hot during operation, and the heat is naturally transferred to the hub motor components, increasing the heat of the hub motor.

4. Motor bearing system problems

During the actual inspection, it was found that when the temperature of the bearing system is high, its heat will also be transferred to the hub motor; when the temperature of the winding rises, it will in turn have an adverse effect on the bearing system; the superposition of the two problems will lead to problems with the motor in a very short period of time. Under normal conditions, the temperature of the hub motor bearing system is controlled at a relatively stable limit, usually around 95 degrees.

5. Poor or failed grease

Poor or failed grease also tends to cause hub motors to heat up. Except for motors operating in special high temperature environments, most motors operate at temperatures below 70 degrees. However, if the grease is insufficient or fails, hub motors may operate at too high a temperature, which in turn can lead to failures in which the bearings fall apart and hold up.

6. Stator-rotor sweeping problem

When a hub motor is operating normally, the air gap between the stator and rotor should remain in a fairly uniform and stable condition. However, if the stator and rotor have virtual friction or actual friction problems, then the phase friction element will heat up, raising the temperature of the motor winding from a local to an overall level.

7. Poor thermal operation of the motor

When a hub motor is running, the supporting equipment usually provides the necessary thermal environment. Occasionally, however, the motor will run in a confined environment or the space will be too small, which prevents heat from being exchanged, causing the motor to heat up quickly. Another situation is that the heat dissipation system of the wheel motor is damaged or the heat dissipation pipe is obstructed, which leads to poor heat dissipation and makes the wheel motor hot.

8.the quality of the motor itself

Some manufacturers reduce the number or size of the heat dissipation tendons to save cost, so that the heat dissipation area of the motor is reduced and the wheel motor with substandard quality is produced. Or the foundation of the motor is not firmly installed, causing vibration, resulting in frictional heating.

The above is the cause of hub motor heat, I hope it will help you, for more information, please feel free to consult Vshida micro motor