Rear wiper power core: In-depth analysis of DC permanent magnet motor

1. DC permanent magnet motor: the power source of rear wiper
The power heart of the rear wiper-the DC permanent magnet motor, is a device that uses the interaction between DC current and permanent magnets to generate rotational torque. Its core components include stator, rotor, brushes and commutator. The stator is fixed and has multiple sets of coils wound inside. When DC current passes through these coils, a fixed magnetic field is generated. The rotor is made of permanent magnets, and its magnetic poles interact with the stator magnetic field to generate rotational torque and drive the rotor to rotate. The brushes and commutator are responsible for constantly changing the direction of the current during the rotation of the rotor to ensure that the rotor can rotate continuously and stably.

2. Advantages of DC permanent magnet motor
The reason why the rear wiper chooses DC permanent magnet motor as the power source is mainly due to its many advantages:

Simple structure: The structure of DC permanent magnet motor is relatively simple and easy to manufacture and maintain. This reduces the production cost of the rear wiper and is also conducive to later repair and replacement.
Small size and light weight: With the development of the lightweight trend of automobiles, higher requirements are placed on the weight and volume of components. The DC permanent magnet motor, with its small size and light weight, perfectly meets this demand, allowing the rear wiper to be installed more flexibly at the rear of the vehicle.
High efficiency: The DC permanent magnet motor has a high energy conversion efficiency and can convert the input electrical energy into mechanical energy to the maximum extent, thereby driving the rear wiper to work efficiently. This not only reduces energy waste, but also improves the wiping efficiency of the wiper.
Easy to control: The speed and direction of the DC permanent magnet motor can be easily achieved by changing the size and direction of the input current. This enables the rear wiper to flexibly adjust the wiping speed and frequency according to different weather conditions and the needs of the driver.
3. The role of the DC permanent magnet motor in the wiper system
In the rear wiper system, the DC permanent magnet motor plays a vital role. It not only provides a stable power source for the wiper arm and wiper blade, but also ensures the wiping effect of the wiper under different weather conditions through precise speed control. For example, on rainy days, the driver can increase the input current of the DC permanent magnet motor by operating the switch, thereby increasing the wiping speed and frequency of the wiper to ensure that the windshield is always clear. On sunny days or with light precipitation, the input current can be reduced to reduce the wiping speed and frequency to reduce unnecessary noise and energy waste.

In addition, the self-locking function of the DC permanent magnet motor is also an important safety guarantee in the rear wiper system. When the motor stops working, the self-locking effect of the worm gear mechanism can prevent the wiper from swinging by itself due to external forces (such as wind), thereby avoiding potential scratches and damage risks.