1. Definition of low-speed motor

The speed of low-speed motor is generally 0.83r/min-300r/min. It is a new generation of high-tech product that integrates electromagnetic drive and deceleration mechanism inside the motor. It is directly driven and there is no gear or chain deceleration mechanism inside the motor.

2. Advantages of low-speed motors

1. Gearless transmission system, very low motor noise and beautiful appearance

2. There is no wear inside the motor, the failure rate is low, the maintenance-free nature is relatively good, and the repair is relatively convenient.

3. Disadvantages of low-speed motors

1. The power is poor, and the strength when starting uphill is relatively insufficient.

2. The relative speed is low, the counter electromotive force is small, the ability to limit the working current is low, the current consumption is large, and it consumes electricity.

3. The inside of the motor is affected by the magnetic field, and the resistance when riding without electricity is greater and feels heavy.

4. The efficiency of the motor is low, usually only 70% to 75%. The motor is heavy and has a relatively small torque.

5. Due to the demagnetization of motor magnets, the power performance drops significantly after two to three years of use. After replacing a new battery, the cruising range on a single charge will also be significantly shorter than that of a new car.

4. Causes and solutions of low-speed motor failures

1. Motor overheating

reason:

a. Overload operation;

b. There is too much oil on the surface of the motor;

c. Low voltage and heavy load operation;

d. The output shaft and transmission device are improperly connected.

Solution:

a. Replace the motor with a larger model;

b. Clean the appearance of the motor to improve heat dissipation performance;

c. Adjust to normal voltage;

d. Adjust to the appropriate position.

2. Motor noise

reason:

a. Overloading causes serious wear of gears;

b. Bearing loss or excessive clearance;

c. Insufficient or deteriorated lubricating oil;

d. Improper connection between the output shaft and the transmission device;

e. Bolts are loose;

f. The transmission device is poorly fixed.

Solution:

a. Adjust to the appropriate load or replace the motor with a larger model;

b. Replace the bearings;

c. Add appropriate amount of lubricating oil according to instructions;

d. Adjust to the appropriate position;

e. Tighten the bolts;

f. The transmission device is fixed.

3. Oil leakage

reason:

a. Oil seal damage;

b. Too much oil;

c. The motor screws are loose;

d. The shell is broken.

Solution:

a. Replace the oil seal;

b. Add appropriate amount of lubricating oil according to instructions;

c. Tighten the bolts;

d. Replace the shell.

4. The motor cannot operate normally

reason:

a. Overload operation;

b. The motor is damaged or the wiring is wrong;

c. The power cord is loose;

d. The single-phase starting capacitor is damaged.

Solution:

a. Replace the motor with a larger model;

b. Repair the motor and connect the wiring correctly;

c. Connect the power cord;

d. Replace the capacitor.