The brushless DC water pump is a new type of water pump motor system. It adopts the structure of a permanent magnet synchronous motor and the driving mode of a brushless DC motor. It has the advantages of simple structure, high efficiency and low noise.

Its basic working principle is as follows:

1. Permanent magnet rotor

The rotating part of the water pump adopts a rotor made of permanent magnet material, which will generate a stable magnetic field under the action of an external current.

2. Brushless DC motor drive

There is a stator winding around the rotor. By applying an appropriate DC voltage to the stator through an electronic controller, a rotating magnetic field can be generated to drive the rotor to rotate. This brushless DC motor drive method can accurately control the rotor speed.

3. Impeller pumping

The rotation of the rotor drives the coolant to circulate in the pump body through the impeller. The centrifugal force of the impeller sucks the liquid from the pump inlet and discharges it from the pump outlet under high-speed rotation.

4. Electronic control

The entire water pump system is centrally managed by an electronic controller. The controller can adjust the motor speed in real time according to the feedback signal of the temperature sensor, thereby accurately controlling the flow and pressure of the coolant to achieve the best cooling effect.

Compared with traditional mechanical water pumps, brushless DC water pumps have the following advantages:

1. Low noise: no mechanical friction and impact, noise can be reduced by more than 80%

2. Long life: no regular maintenance is required

3. Small size: high integration, easy to install

4. Fast response: can adjust the speed instantly to improve cooling efficiency

In short, brushless DC water pumps play an increasingly important role in the cooling of new energy vehicle batteries and motor electronic control systems with their excellent performance parameters. With the continuous advancement of technology, it will surely occupy an important position in future electric vehicle applications.