Three-phase brushless dc pumps and sta (single phase) brushless dc pumps contrast: three-phase brushless dc pumps adopt six slots of the stator, which has three of magnetic field, the pump is controlled by MCU, intelligent detection position to the reversing, no additional sensors, so the pump inside the pump body can not in any electronic components, circuit boards and external aluminum radiator shell sealing, high temperature inside the pump body of the eddy current will not affect the circuit board.
External pump circuit boards, after all the inside of the pump body material for high temperature can be used in more than 100 degrees of boiling water. Pumps with reverse connect protection, jammed protection, over flow pressure protection, smart program or manual control of motor speed, etc. And the same volume of water pump driven by three-phase control mode of pump power can be much higher than two phase. (three-phase dc and three-phase ac are completely different concepts, three-phase dc power supply mode and the common dc is the same, one is a negative, and three-phase ac is three line, three phase dc missing one phase is used to implement sensorless position detection, so that you can remove the pump internal sensor) popular in terms of three phase dc can be called brushless dc sensorless smart pumps.
Two phase dc water pump is hall element is used to detect the position, again through the drive plate reversing. Built-in pump control circuit boards, hall-effect sensors detect the location and provide directional signals, and the more power is the higher the temperature of the eddy current inside the pump body, sometimes have reached more than 100 degrees, but in general electronic components heat resistance is 85 degrees, so two phase dc pumps generally only do current 2 a below, and use the water had better not more than 60 ~ 70 degrees, otherwise the pump reliability cannot be guaranteed.
Two kinds of water pump performance contrast:
Can only do the current of power: two phase 2 a maximum power under 50 w. Three phase can be more than 2 a maximum power 95 w
Heat resistance: two phase 60 degrees, three-phase 100 degrees (three-phase circuit board is external, so can be used at high temperature)
Impact resistance: two phase reversing impact, has a large starting current, three-phase program is reversing, no impact, and it is soft start, small startup current.
Protection: three-phase dc pumps have jammed protection, reverse connection protection and so on.
Vibration resistance: two phase commutation for hall element detection position, not strong vibration resistance.
Three-phase dc for the program to the reversing, strong vibration resistance.
Controllability: two phase dc pumps can speed through adjustable voltage, when the system to process control, difficult to achieve,
The high cost. Three-phase pump can also be through the adjustable voltage to change speed, but the three-phase pump can also lead to control signal, can realize the PWM speed regulation, 0 to 5 v analog signal control, manual control, fast response, and it is easy to implement.