36V 250W Electric Bicycle Motor Repair Tips
1. The no-load current of the motor is large
When the no-load current of the motor is greater than the limit data, indicating that the 36V 250W electric bicycle motor has a fault. The motor no-load current is large for reasons such as mechanical friction inside the motor, local short circuit of the coil and demagnetization of the magnets. We continue down to do the relevant tests and check items, you can further determine the cause of the fault or fault areas.
36V 250W electric bicycle motor no-load / load speed ratio greater than 1.5, turn on the power, turn the handle, so that the motor no-load high-speed rotation of more than 10s. After the motor speed stabilizes, measure the highest no-load speed of the motor at this time N1. Under standard test conditions, travel more than 200m distance, start measuring the highest speed of the motor load N2.
When the no-load/load speed ratio of the motor is greater than 1.5, it means that the magnet demagnetization of the motor has been quite powerful, and the whole set of magnets inside the machine should be replaced, in the actual maintenance process of the electric bicycle, generally is to replace the whole motor.
2. 36V 250W electric bicycle motor over heating
The direct cause of 36V 250W electric bicycle motor over heating is caused by the current, motor current, motor input electric potential E1 motor rotating inductive electric potential E2 and the relationship between the motor coil resistance R is: E1-E2 and R increases, that R becomes smaller or E2. reduced R becomes smaller - generally caused by a short circuit or open coil, E2. reduced is generally the magnet steel The decrease in E2 is generally caused by demagnetization of the magnet or a short circuit or open circuit in the coil. In the maintenance practice of electric vehicles, the method of dealing with the motor heat release barrier, - generally is to replace the motor.
3. The 36V 250W electric bicycle motor in the operation of the internal mechanical collision or mechanical noise
Whether high-speed motor or low-speed motor, there should be no mechanical collision or discontinuous irregular mechanical noise when the load is running.
Different forms of motors can be repaired using different methods.
4. The whole bicycle driving range shortened, 36V 250W electric bicycle motor weakness
Bicycle mileage short and motor powerlessness commonly known as motor powerlessness of the reasons are more complex. But when we exclude the above four kinds of motor failure, generally speaking, the short range of the whole bicycle is not caused by the motor failure, which is related to the battery capacity decay. Charger charge is not enough, the controller parameters drift PWM signal does not reach 100% and other related.
5. Brushless motor is out of phase
Brushless motor is out of phase - is generally caused by damage to the brushless motor's Hall element. We can measure the resistance of the output lead of the lug element and the relative lug ground and the relative lug power lead, and use the comparison method to determine which lug element is faulty.
To ensure the accuracy of the motor phase change position, it is generally recommended to replace all three Hall elements at the same time. Before replacing the lug element, we must find out whether the phase algebraic angle of the motor is 120º or 60º, generally 120º phase angle motor is parallel to the placement of the three lug elements. And 60º phase angle motor, the middle of the three lug elements of a lug element is a star flip 180º position placement.