Difference between 2-phase and 3-phase

We’ve written a Brushless DC Pump Definitive Guide to cover this topic. Please visit it and get a comprehensive view of brushless DC pumps.

Both 2-phase and 3-phase brushless DC pumps use low voltage DC power sources instead of 110V or 220V AC power. 3-phase brushless DC pump allows a significant increase in the pump’s rated power to improve the performance. And it can work in a higher temperature environment.

Three-phase brushless DC technology is an excellent upgrade of two-phase brushless DC technology.

2-phase brushless DC motor


The two-phase motor has a 4-slots stator and two pairs of magnetic fields. It must put a hall sensor inside of the pump body to check the rotor position. So we need to put the circuit inside of the pump.

When the pump was working, the motor’s current will cause a high temperature (sometimes even more than 100 Celsius). In general, the electronic component’s temperature resistance is 85 Celsius.

So we usually produce a two-phase pump’s current of 2 amperes or less and need to guarantee the environmental temperature is less than 60~70 Celsius. Otherwise, the pump’s reliability cannot be ensured.

3-phase brushless DC motor

The three-phase brushless DC motor has a 6-slots stator and three pairs of magnetic fields. The pump use MCU control, and intelligent commutation position detection without additional sensors.

So we do not need to put any electronic component inside of the pump body. We put all the circuits outside of the pump body, using the Aluminum case potting with epoxy.

Therefore, the high temperatures generated by the motor work will not influence the circuit. Meanwhile, we replaced all the pump’s materials with high-temperature-resistant materials; then the pump can be used in hot water even more than 100 Celsius.

Advantages of 3-phase brushless DC pump

A three-phase brushless DC pump has many advantages over a two-phase brushless DC pump.

When we use a three-phase brushless DC motor driven instead of a two-phase, we can make the pump power much higher, which means a much larger flow rate and higher head.

Due to the use of MCU, we can add many program functions to the pump, such as Reverse protection, stuck protection, over-current protection, manual speed control, gifted program, and so on.


Some things need to attend, three-phase DC is entirely different from three-phase AC. Three-phase DC has the same power supply as the two-phase DC, and it has two power cables, one positive and one negative. However, the three-phase AC has three power cables.

How to distinguish our two-phase and three-phase pumps? 

And view our Model Code Instruction here.

3 phase vs 2 phase brushless dc pump


We are focused on brushless DC water pump's R&D and production from 2009. A water pump manufacturer with about 100 highly technical, skilled employees in Shenzhen of China.
We've chosen to provide customers with comprehensive and flexible solutions according to customers' needs and win at the product quality.
Our passion lies in helping start-ups grow from "Zero to One." So if you have any questions need to discuss with our engineer-turned sales consultant, don't let anything stop you move forward.
bldc pump product catalog cover 2024 400x500

Get our full Product Catalog (PDF File)

Before you go, grab your free BLDC Pump Product Catalog! Quick sign-up below to find innovative pump solutions that might be just what you need in the future.

Tell us your requests to get solution. Let's push things forward.

Submit a Quick Quote

    bldc pump product catalog cover 2024 400x500

    Grab Free Product Catalog

    Before you go, grab your free BLDC Pump Product Catalog! Quick sign-up below to find innovative pump solutions that might be just what you need in the future.