Principle and application of brushless DC water pump

The difference between the brushless DC water pump and the traditional brush water pump is mainly the difference in structure, and therefore there are differences in life, cost, and use. The brushed water pump has carbon brushes, which will wear out during use, so the service life is short and the price is low. The brushless water pump has no carbon brush, and has a relatively long life and high cost.

In terms of driving mode, although both brushless water pumps and brushed water pumps are electric water pumps, the brushless DC water pumps are driven by brushless DC motors, and the brushed water pumps are driven by brushed motors. By default, it is a brushed DC water pump. Said tradition has a brush water pump. The working principle of the two is different.

The difference between the brushless DC water pump and the motor-type water pump is the motor plus the pump body, which can be understood as a split structure. The brushless DC water pump is an integral structure, the driver is inside the pump, and the airtightness is good. In addition, water pumps have different classification methods at different levels. I don’t know what the purpose of the water pump is. Let me show you a brushless DC water pump, which is used in the field of automotive heat dissipation: 24V DC, magnetic drive.

The definition of a brushless DC pump: a machine that uses a DC 4.5V~24V to drive a brushless motor. The rotation of the brushless motor drives the rotation of the impeller, thereby increasing the pressure of the liquid to achieve the effect of transferring the liquid. Brushless DC water pumps can be divided into: brushless motor DC water pumps, brushless DC magnetic drive water pumps.

The brushless DC magnetic drive water pump adopts electronic component commutation without using carbon brush commutation. It adopts high-performance wear-resistant ceramic shaft and ceramic bushing. The bushing is integrated with the magnet by injection molding to avoid wear and tear, so there is no brush. The service life of the DC magnetic water pump is greatly enhanced. The stator part and the rotor part of the magnetically isolated water pump are completely isolated. The stator and the circuit board are potted with epoxy resin, 100% waterproof, the rotor part is made of permanent magnets, and the water pump body is made of environmentally friendly materials, low noise, small size, and performance stability. Various required parameters can be adjusted through the winding of the stator, and it can be operated at a wide voltage.

The definition of a brushless DC pump: a machine that uses a DC 4.5V~24V to drive a brushless motor. The rotation of the brushless motor drives the rotation of the impeller, thereby increasing the pressure of the liquid to achieve the effect of transferring the liquid. Brushless DC water pumps can be divided into: brushless motor DC water pumps, brushless DC magnetic drive water pumps.

The brushless DC magnetic drive water pump adopts electronic component commutation without using carbon brush commutation. It adopts high-performance wear-resistant ceramic shaft and ceramic bushing. The bushing is integrated with the magnet by injection molding to avoid wear and tear, so there is no brush. The service life of the DC magnetic water pump is greatly enhanced. The stator part and the rotor part of the magnetically isolated water pump are completely isolated. The stator and the circuit board are potted with epoxy resin, 100% waterproof, the rotor part is made of permanent magnets, and the water pump body is made of environmentally friendly materials, low noise, small size, and performance stability. Various required parameters can be adjusted through the winding of the stator, and it can be operated at a wide voltage.

When choosing a brushless DC pump, first determine the working voltage, current, head and flow, and the size of the caliber. The maximum head of the pump generally refers to the static head without water flow when the water is pumped to the maximum head. If the customer requires the water to be pumped to a certain level If the height is to maintain a certain water flow, the required lift when selecting the pump must be higher than the specified pumping height. This specific is determined by the supplier according to the actual situation.

Determine the volume and shape requirements (threaded interface, the direction of the water inlet and outlet, the size of the caliber). Determine the working environment (temperature, medium). Determine the functional requirements (time control, motion control, pressure control, flow control, speed control).

The brushless DC water pump uses the principle of a permanent magnet brushless DC motor. An impeller is added to its rotor. The housing structure is designed as a cavity for centrifugal movement of the liquid. Because there is no carbon brush friction, no sparks are generated. ; High efficiency, low power consumption, longer life than brushed motors, and low noise.

Brushless DC water pumps are mainly used in water supply functions such as: coffee machines, tea sets, water heaters/hot water dispensers, water dispensers/beverage machines, foot baths, irrigation systems/equipment, etc. Oil supply function / high efficiency and energy saving, such as: various machine tools, oiling equipment, etc. Heat dissipation/water circulation systems such as: medical systems/equipment, automation equipment, electronic refrigerators, indoor and outdoor small fountains, solar fountains, aquarium fish tanks, hot and cold mattresses, cushions or nursing products, etc. Drainage function such as: mobile air conditioner.

The application of brushless DC water pump in cleaning and flushing functions such as: Washing glass system/equipment of various automobiles. Automobile industry: It is used for cold start of automobile engine below minus 40 degrees in winter, heat dissipation of antifreeze fluid of fuel engine at high temperature of 120 degrees, and water circulation for electric vehicles and electric motorcycles.

When choosing a brushless DC pump, pay attention to the medium: the medium of the pump must be considered. For example, there are chemical pumps that require corrosion resistance, such as clean water pumps, high-temperature pumps, etc., first determine the nature of the medium. Choose the nature of the pump. For example, a centrifugal pump does not have a suction lift, and a diaphragm pump has a suction lift; select the appropriate head flow rate, generally water pumps have such parameters indicated; select the correct voltage and pay attention to the positive and negative poles, and the positive and negative poles of the DC pump It is strictly forbidden to connect the poles in reverse, and the voltage application range is relatively small. Choose the appropriate shape and diameter of the inlet and outlet

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