What are the maintenance methods of electric vehicle motors?

The motor of electric vehicle is one of the important components to promote the rapid operation of electric vehicle, so how to repair the fault in the process of use? The following is the maintenance method of electric vehicle motor that I sorted out for you, hoping to help you.

Maintenance method of electric vehicle motor

1, the motor does not rotate.

1* * measure the voltage of the motor lead with a multimeter, and you can immediately judge the fault of the line or motor. * * * If there is electricity, open the electric door lock. Measure the output line of the controller with a multimeter in DC range, and turn the knob to measure whether there is voltage, so as to find out the fault. If there is voltage in the measurement result, it is concluded that the motor is damaged or the wire from the controller to the motor is broken, and further inspection should be made. You can also short the input line of the motor, turn the wheel to see if there is resistance, pull back normally, break the internal line or have poor contact with the carbon brush without resistance.

2*** measurement method. Disconnect the brake plug of the controller and turn the knob. If the car rotates and the brake handle is broken, it needs to be replaced: if it doesn't rotate, short-circuit the controller's handlebar+* * * red electrode three wires with the general green signal wire. At this time, if the motor rotates, it means that the wire from the handlebar or the controller to the handlebar and the plug are in poor contact or damaged. * * * Note that the red * * * positive electrode * * and black * * * negative electrode * * * of the knob wire at the controller end cannot be short-circuited! * * * Replace the original knob with an improved knob. If the car moves, it is concluded that the handlebar is broken and needs to be replaced; If the car does not move, the controller is broken and needs to be replaced.

3*** Measure the two contacts of the battery box, and you can immediately judge that the car does not turn because of the failure of the power supply part. If there is no voltage, the safety tube may be broken or the connecting wire may fall off; If there is voltage, the power supply may be locked.

2. Turn on the power and lock the car.

Disconnect the plug of the controller knob. If you open the electric lock, the car won't turn and the knob will be broken. If the electric lock is turned on, the car is turning and the controller is broken.

3, the power lock will burn insurance or flying car.

Disconnecting the power plug or motor plug of the controller can immediately determine the fault. Disconnect the power plug of the controller and open the power lock. If the fuse is still blown, it is caused by an open circuit in one or more circuits such as headlights, speakers and instrument panel. If the fuse is not blown, it is a controller or motor fault; In another case, if the safety value is too low, it will burn if it can't bear the heavy current load, and the capacity should be 20 A. The phenomenon of runaway is that the controller is damaged, and the motor with runaway can't be controlled by the steering handle. The controller should be replaced.

4. Slow speed

Measure the interface voltage of the high-speed handle of the controller. When rotating the handle, the output voltage of the signal port should change between 0.8 and 4.8V, otherwise the handle will break. Measure the power supply voltage with the multimeter DC range, then measure the motor voltage * * * and adjust it to the maximum * * *. If the voltage difference is greater than 1V, the controller is judged to be faulty and should be replaced; When the motor is rotating, there is abnormal noise, or when riding, the motor shell is overheated * * * and the heat is touched by hand * * *, then it is concluded that the motor is faulty; Low battery voltage will also cause slow rotation speed * * * The battery has exceeded its service life or is under-charged * * *; The design and manufacturing defects of the motor itself cannot be ruled out, which leads to the motor being stuffy and slow, so the motor should be replaced; If the speed slows down due to the wear of the motor carbon brush, the carbon brush should be replaced. In the process of maintenance, it is found that the motor has abnormal sound, usually because the motor bearing or the magnetic steel in the motor falls off, so the rotor should be replaced.

Fault maintenance of motor bearing

Process inspection

When the bearing is short of grease, you will hear the sound of "bones gnawing at bones"; If you hear a discontinuous "stalk" sound, it may be that the bearing steel ring is broken; If the bearing is mixed with sand and other sundries or the bearing parts are slightly worn, it will produce slight noise.

Inspection after disassembly

First, check whether the bearing rolling elements and inner and outer rings are damaged, rusted and worn. Then hold the bearing inner ring with one hand and straighten the bearing, and push the outer ring with the other hand. If the bearing is in good condition, the outer ring should rotate smoothly without vibration and obvious jamming, and the outer ring will not retreat after stopping, otherwise the bearing will be damaged. You can also hold the outer ring with your left hand and the inner steel ring with your right hand and push it hard in all directions. If you feel loose when pushing, it means that the bearing is badly worn.

Fault repair method

Remove the motor from the electric bicycle, unscrew the motor screw, first open the motor end cover with a puller, and then remove the old bearing with a puller to check whether the bearing is short of grease or damaged. Rust spots on the outer surface of the bearing can be wiped off with sandpaper, and then cleaned with gasoline; If the bearing is cracked, the inner and outer rims are cracked or the bearing is excessively worn, the bearing should be replaced with a new one. When replacing a new bearing, choose the same bearing as the original model. When installing a new bearing, put the new bearing in the position of the old bearing, knock it with a steel bar and install it in a suitable position.

Maintenance measures of electric vehicles

1, don't change the charger casually, use a special charger. Improper use of different types of chargers may lead to battery leakage, heating, smoking, fire or explosion.

2. Remember not to leave the electric car in a state of insufficient power for a long time, and don't charge it after riding a little. The master of the garage knows that charging is best when the battery is 30% left.

In the cold winter, the battery must be stored in the indoor memory and charged indoors. The best charging environment for trams is 25℃, which can enhance the storage capacity of batteries and extend the driving distance.

4. Do not charge for more than 24 hours. In general, the charging time should be 8 hours in winter and 2 hours in summer. Charging for one night will shorten the battery life!

5. It can float slightly at low temperature. What is a floating charge? That is, after the indicator light indicates full charge, continue charging as much as possible 1-2 hours. This can effectively inhibit battery vulcanization.