1. Working principle of the motor:

The core function of the electric bicycle motor is to convert electrical energy in the battery into mechanical energy, which drives the wheel to rotate forward. The common type of electric 

bicycle motor is the permanent magnet DC motor, which uses the principle of electromagnetic force to generate power through the interaction between the magnetic field generated by 

the current in the winding and the permanent magnet.

2. Relationship between motor performance and vehicle parameters:

- Motor power: The power of the motor directly affects the acceleration ability and maximum speed of the electric bicycle. Generally speaking, the greater the power, the stronger the driving 

force of the vehicle, the higher the maximum speed may be, but it will also increase energy consumption and affect the driving range.

- Range: Range is affected by a variety of factors such as motor efficiency, battery capacity, riding conditions (such as speed, road conditions, load). At a constant speed or close to a constant 

speed, the energy consumption is lower and the endurance is longer.

Top speed: In addition to motor power, top speed is also limited by the controller setting, the overall design of the vehicle (such as air resistance) and the speed limit prescribed by law.

3. Current status and development of motor technology:

Current electric bicycle motor technology is moving towards higher efficiency, lighter weight, longer life and intelligence. This includes adopting new materials, optimizing motor designs to 

reduce energy consumption, and improving thermal management capabilities.

- The rise of the sharing economy has promoted the development of shared electric vehicles, placing higher requirements on the durability and maintenance convenience of electric bicycle motors.

4. Motor maintenance and troubleshooting:

Daily maintenance of the motor includes checking the motor housing for damage and avoiding water and other impurities from entering the motor interior.

- Fault maintenance may involve motor non-rotation, weakness, abnormal sound and other problems, usually need professional disassembly inspection, including checking whether the winding 

is short circuit, whether the magnetic field is weakened, whether the bearing is worn.

5.  Motor temperature resistance characteristics:

As a key component of the motor, the temperature resistance of permanent magnet is noteworthy. Some permanent magnets will rapidly lose magnetism at more than 300 degrees Celsius, so 

the motor needs to consider heat dissipation when designing to ensure that the motor can operate stably within a safe temperature range.

To sum up, the electric bicycle motor is not only related to the power performance of the vehicle, but also a key factor affecting the endurance, maintenance costs and overall use experience. 

With the advancement of technology, the electric bicycle motor of the future will be more efficient, intelligent, and adapt to more diversified use scenarios.