Motor action of car wiper
The main role of the wiper motor is driven by the motor, and the rotary motion of the motor is converted into the reciprocating motion of the wiper arm by the connecting rod mechanism, so as to achieve the wiper function . When the motor is started, the wiper can start to work, by adjusting the working gear of the motor (high speed or low speed), the current of the motor can be changed, so as to control the speed of the scraper arm .
The classification of wiper motor and its working principle
Wiper motors are mainly divided into the following types:
DC wiper motor : DC power supply is used, usually having one or two fixed contacts and rotating contacts. When the wiper controller sends a signal, the motor adjusts its rotation speed according to the signal, and drives the wiper to work .
AC wiper motor : The use of AC power supply, the working principle is similar to the DC wiper motor, but the circuit and contacts are different .
electroless wiper motor : The use of electroless speed change technology, can achieve the stepless speed change of the wiper, usually has a rotating contact and a fixed contact .
The structure and work flow of the wiper motor
The wiper motor is usually integrated with the worm gear mechanical part and is mounted on the front windshield of the car. The motor drives the output shaft through the worm wheel, drives the output gear through the idler wheel and the idler shaft, and then the output shaft controls the output arm connected to the connecting rod of the wiper. When the motor rotates, the output arm and connecting rod will move in the front and rear direction, driving the wiper to work . In addition, some advanced wipers are also equipped with electronic control unit ECU, adjust the speed of the motor through the resistor, adjust the working state of the wiper as needed .
Wiper motor fault the main performance is that the wiper can not work, abnormal sound and so on. The working principle of the wiper motor depends on the synergy of components such as the motor, connecting rod, rocker arm and wiper blade. When the wiper switch is turned on, the motor starts and drives the connecting rod and rocker arm, so that the wiper blade swings back and forth on the windshield to achieve the function of removing rain or snow.
Common faults and causes
wiper does not move only water : this may be that the spray motor is working normally, and the wiper motor is faulty. The relay should be checked for problems and replaced with a new relay if necessary.
Transmission link deviation and silent failure : Open the guide cover inside the vehicle to see if the transmission link is deviating from its original position. If the connecting rod is normal, but there is no sound when opening the wiper, it is likely that the motor is faulty.
motor winding burnt and fuse blown : Use a multimeter to test the interphase resistance of the motor, if the resistance reading is infinite, it indicates that the motor winding has been damaged. At the same time, check the fuse of the wiper, if it is found that the fuse is blown, the problem may be solved after replacement. If the fuse is still broken after replacement, it may be the problem of the motor itself.
Abnormal odor and silent motion : Start the vehicle, open the front cover, and observe whether there is motor rotation sound when the wiper is moving. If there is no sound and accompanied by a burning smell, this may be a clear sign of motor damage.
Fault detection method
Check the power supply : Make sure the battery is fully charged, check for blown fuses, broken wires or poor contact.
Use a multimeter to test the motor resistance : if the resistance reading is infinite, the motor winding is damaged.
Check the relay and connecting rod : Make sure the relay is working properly and the connecting rod is in the correct position.
Prevention and maintenance advice
Regular inspection of motor, fuse and wiper : ensure that they work properly, timely replacement of damaged parts.
Choose high quality wiper : ensure that its length, shape and installation method match the model, improve the service life of the wiper and wiper effect.
Keep the circuit system clean : prevent dust and moisture from affecting the circuit system, clean and maintain the circuit system regularly.
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