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Dalan Motor Xiaobian gives you a picture of the wiring method for your reference; 
1: When the oil pump motor is connected to the triangle, there is no neutral point. The specific method is that the head and the tail of the three-phase winding of the motor are connected separately. At this time, there is only one voltage level, the line voltage is equal to the phase voltage, and the line current is equal to the phase current. 1,73 times,
2: The oil pump motor is connected to the star because there is a neutral point (the motor is generally a three-phase symmetrical load, so the neutral line is generally not drawn). The specific method is that the three tails of the three-phase winding of the motor are connected together, and the three heads are connected. The power supply, at this time, has two voltage levels, namely the line voltage and the phase voltage, and the line voltage is equal to about 1.73 times the phase voltage, and the line current is equal to the phase current.
3: It should be noted that the motor with the star connection cannot be connected to a triangle. (If it is connected to a triangle, the phase voltage will rise to about 1.73 times, and the motor will burn out when running for a long time).
4: The oil pump motor with the original delta connection cannot be connected to a star shape. (If it is connected to a star, the phase voltage is reduced to about 1.73 times, which does not reach the normal power. If the rated load is used, then it is overloaded. For a long time, it will inevitably burn the motor).
5: In China, the smaller motors below 3-4KW (kW) are all specified to be connected to a star shape. The larger motors above are specified to be connected in a triangle.
6: Why are the larger power motors connected in a triangle? The advantage is that when the light load is started, in order to facilitate the step-down start (the star is connected at the start, the triangle is changed during the operation, and the motor start time is extremely short and connected to the star. The advantage is that the starting current can be reduced to 1/3, etc.).
The star-connected phase current is equal to the line current, the line voltage is 3 times the root of the phase voltage, the delta connection, the line voltage is equal to the phase voltage, the line current is 3 times the root of the phase current, and the connection is connected to the three-phase symmetric load. Can increase the operating voltage per phase, increase power,
The delta connection helps to increase the motor power, the disadvantage, the starting current is large, and the winding withstand voltage (380V) is large! Increased insulation rating!
Planetary connection helps to reduce the winding withstand voltage (220V) and reduce the insulation level! Reduced starting current, shortcomings, reduced motor power! Therefore, most of the small power motors below 4KW use planetary connection! Use a delta connection of more than 4KW! The motor with delta connection uses Y-â–³ start at light load start to reduce the starting current! Light load is a condition, because the Y connection torque will become smaller, reducing the starting current is the purpose, using the Y connection method to reduce the starting current!
The power of the delta connection is large, the starting current is also large, the power of the star connection method is small, and the starting current is also small.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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