There are two main ways of connecting the motor, star connection and delta connection.
Star connection method is to connect the three ends of the three-phase coil of the motor together as a common end, and the three front ends lead three connection lines. As shown in the figure, the phase A load is represented by u1u2, the phase B load is represented by v1v2, and the phase C load is represented by w1w2, that is, u2 and v2 are connected together with w2, and the three wires of u1, v1, and w1 are drawn) the voltage of each phase coil is received. It is the phase voltage of 220 volts, that is, the voltage between the live line and the neutral line (neutral line).
The delta connection is the connection method in which the beginning and end of each phase of the three-phase coil of the motor are sequentially connected. Figure A phase load is represented by u1u2, phase B load is represented by v1v2, phase C load is represented by w1w2, phase A is connected by u1 and w2, phase B is connected by v1 and u2, phase C is connected by w1 and v2, and three are extracted. The line is also u1, v1, w1, and the voltage that each phase coil is subjected to is the line voltage of 380 volts, that is, the voltage between the live line and the live line.
This calculator is only suitable for purely resistive loads such as electric heaters. It is not applicable to loads such as motors and transformers.