Regarding the connection method of the motor terminal, the following is a summary of the difference between the single-phase and three-phase connection and the difference between the three terminals and the six terminals, and share with the electrician friends, I hope to help you in the actual operation. .
Single-phase motor terminal connectionU2 is connected to V1, a capacitor is connected between V2 and U1, the power line is connected to U1, and the power supply is connected to U2.
Use 2 micro-capacitors for motor capacity below 40W and 4 micro-capacitors for 60~120W.
The positive transmission is connected to the zero-fire line and connected to U1/U2. The reverse connection removes the connecting piece, connects z1-z2, u1-u2, and then connects z1 and u1 to the zero-fire line respectively.
Three-phase motor terminals have two types of wiring operation.
The first type is a star (Y) connection, the first or the last end of the three-phase stator winding of the motor is connected, and the other three phases are respectively connected to the UVW three-phase alternating current, which is suitable for three-phase asynchronous induction of three kilowatts or less. Electric motor.
The second type is a triangular (â–³) connection method, that is, the first and the last ends of the three-phase stator windings are connected, and the connection between the first end of the first phase winding and the tail end of the third phase winding can be regarded as a U phase, and the second winding end and the second winding The tail end of one winding may be connected to the V phase, and the first end of the third winding and the tail end of the second winding may be connected to the W phase, respectively, and are respectively connected to the UVW three-phase AC power supply, and are suitable for three-phase asynchronous of 4kw and above. Induction motor. However, the wiring method of the motor should be based on the actual nameplate wiring.
The three-phase winding of the three-phase asynchronous motor has six terminals, which are connected to the six wires of the junction box and marked with symbols D1, D2, D3, D4, D5, D6, where D1 and D4, D2 and D5 Each of D3 and D6 is a phase, called A, B, C three-phase winding, as shown in Figure 1.
There are two ways to connect three-phase asynchronous motors. One is a delta connection, which is indicated by the symbol "â–³"; the other is a star connection, which is indicated by the symbol "Y". The so-called delta connection is to connect the upper and lower columns of the six terminals of the junction box with metal pieces, and then connect the power separately, as shown in Figure 2 (a). The so-called star connection is to connect the above three terminals with metal pieces, and the next three terminals are connected to the power supply separately, as shown in Figure 2 (b).
Figure 1 Schematic diagram of the six wire ends in the junction box
Figure 2 Motor winding triangle or star connection
In the way of connecting the three-phase winding of the motor, it depends on the voltage and wiring method indicated on the nameplate. If the nameplate is marked with voltage 220/3 80V, the connection △/Y indicates that the motor has two wiring modes, which are suitable for two. Different voltages. If the power supply voltage is 220V, it should be connected to a triangle. If it is mistakenly connected into a star, the voltage on the winding connected to each phase will drop from 220V to 220/√3=127V. The motor will not start because the voltage is too low. If it is still subjected to the rated load, it will easily cause overload. burn. If the power supply voltage is 380V, it should be connected to a star shape. If it is mistakenly connected into a triangle, each phase winding will withstand a voltage of 380V, causing the stator current to increase and burn the winding. Therefore, the correct wiring method should be such that the normal voltage of the motor must be equal to or close to the rated voltage of the motor.
3 terminal posts and 6 terminal posts motor connection and difference3 wire column wiring only need to connect the 380V three-phase power line directly to the three-column. The position of two of them can change the steering of the motor, and the two-wire connection of the 6-column terminal and the corner connection. If it is a star connection, the three terminals are connected horizontally to the midpoint, and the wiring of the other three columns can be wired according to the above-mentioned three-column wiring method.
If it is a corner joint, the upper and lower two columns of the six columns are connected together to form three groups. Note that the speed and power of the star connection and the corner connection are different.
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