Introduction to Electronic Water Pumps
1. Working Principle
The working principle of automotive electronic water pumps can be divided into two aspects: electronic control and pump structure.
In terms of electronic control, automotive electronic water pumps are controlled by an onboard electronic control unit (VCU). The VCU controls the pump's start-up, shutdown, and speed based on parameters such as the motor and controller's operating status, temperature, and load, ensuring the cooling needs of the heat source under different operating conditions. This intelligent control method reduces energy consumption and extends the pump's lifespan.
From a structural perspective, automotive electronic water pumps typically consist of a motor, impeller, and housing. The motor is the power source, converting electrical energy into mechanical energy to drive the impeller, drawing in coolant and pressurizing it into the cooling system. The impeller acts as a pressurizer and circulator of the coolant; its structural design and material selection significantly impact the pump's performance. The housing protects the pump, providing fixation and sealing, while also reducing noise and vibration.
When the automotive electronic water pump is operating, coolant is drawn into the pump, pressurized by the impeller, and flows into the cooling channels to absorb heat from the heat source. It then flows back to the pump for the next cycle. This continuous circulation effectively removes heat.
2. Structural Composition
An electronic water pump is a water pump with an electronic control unit. In a brushless DC water pump, the magnet and impeller are injection-molded into a single unit to form the motor rotor. The rotor has a directly injection-molded bushing in the middle, which is fixed to the housing by a high-performance shaft. The motor stator and circuit board are encapsulated in the pump body with epoxy resin. There is a water-proof chamber between the stator and rotor, eliminating the need for traditional mechanical shaft seals; therefore, the stator is completely sealed. The motor's torque generates a magnetic field by energizing the coils on the silicon steel sheets (stator), which drives the permanent magnet (rotor) to operate.
