What is the working principle of a 4-wire wiper motor?
2 Answers
The working principle of a 4-wire wiper motor involves converting the rotational motion of the motor into the reciprocating motion of the wiper arm through a linkage mechanism, thereby achieving the wiper action. Generally, activating the motor will make the wiper work. By selecting high or low-speed gears, the current of the motor can be adjusted, thereby controlling the motor speed and consequently the speed of the wiper arm. Precautions for using the wiper motor: 1. The key to the wiper functioning well is that the rubber wiper blade maintains sufficient moisture. Only with sufficient moisture can it have excellent flexibility to maintain close contact with the windshield. 2. Correct use of the wiper not only extends its service life but also effectively maintains good visibility, which is more conducive to driving safety.
I'm a regular in the workshop and have seen how many 4-wire wiper motors work. Simply put, they have a constant power wire directly connected to the power source to ensure standby power supply, a ground wire for circuit grounding, and low-speed and high-speed wires that control the wiper speed. When the switch connects to the low-speed wire, current flows into the motor, and the internal circuit switches to the low-speed winding, causing the wiper to swing slowly. When the high-speed wire is connected, the current path changes, activating the high-speed winding to make the wiper sweep rapidly. The reset function is achieved through an internal sensor that automatically returns the wiper to the starting point after it's turned off, preventing it from blocking the view. Common issues include aging wires or poor contact, which can cause a speed to fail. I recommend regularly checking the voltage with a multimeter and maintaining the wiring harness before the rainy season to avoid dangerous wiper malfunctions while driving.
