How to connect the star triangle connection of the motor, and how to change the star connection of t

Six binding posts, each pair of upper and lower rows are connected and connected with a phase wire (such as phase A), the other two pairs are the same wiring is a corner connection, the upper (or below) row of three binding posts are shorted together, and the lower three binding posts are connected to the ABC phase wire respectively, which is the star connection.

The line current of the star connection is equal to the phase current, and the line voltage is a multiple of the phase voltage;

The line voltage of the triangle method is equal to the phase voltage, and the phase current is a multiple of the line current;

Therefore, when the winding is connected into a star, the voltage from the phase line to the neutral point is 220V, while the triangle connection method has no neutral point, only the connection between the wires, and the voltage is 380V (according to the general mains to understand).

Generally, the motor of 3kw and below adopts star connection, and the above one uses the triangle connection method. There are also motor nameplates marked with 220V Y380V. It means that when the line voltage is 220V, the star is used, and when the line voltage is 380V, a triangle connection is used.

For example, if the three heating tubes are connected in a star shape, they must use 220V, otherwise they will not reach the rated calorific value, and if the three heating tubes are connected in a triangle, they must be 380V, otherwise they will burn out.

First look at how many poles your motor is (if you don't know, look at the speed, divide by 3000 by the speed), and the poles are connected together every few -1 wire winding lines to set up as a phase, until the phase coincides with the end of the phase; Then complete the three connected together, and connect the ABC phase of the power supply in turn! If the direction of rotation is incorrect, any two phase wires can be transposed and connected!

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What is the difference between the star connection and the triangle connection of the motor?

Triphasic. AC asynchronous motor, triangular connection method.

See Hand Chart of Hands. It should be noted that, according to the standard, the power of less than 3 kilowatts (including 3 kilowatts) of satellite connectors; 380 volts, corner joint; 220 volts. The power is more than 3 kilowatts, and the satellite connection is 660 volts; Corner connection 380 volts. The bib connection method of the motor should not be changed at will.

Disassemble the three transverse connecting pieces, change the vertical state to connect them, and the three differential closed phase lines of the power supply will not move.

Hello, r1=r12*r13 (r12+r13+r23) r2=r12*r23 (r12+r13+r23) r3=r23*r13 (r12+r13+r23) where is the connection formula of the three-phase load at the three corners of the triangle connection, which is divided into two types: star and triangle connection. When the rated voltage of the load is equal to the phase voltage of the power supply, the load should be connected into a star; When the rated voltage is equal to the line voltage of the power supply, it should be connected into a triangle. When the triangle is connected, the negative hand load is directly connected between the two live wires, and the line voltage is beared, and when the star is connected, the load is connected in series between the two live wires, and it bears half of the line voltage (phase voltage), because the load is connected in series between the two live wires is a vector relationship, so the phase voltage is not half of the two live wires, but 1 times 220V.

Star connection: line voltage = phase voltage line current = phase current triangle connection: line voltage = phase voltage line current = phase current star connection:

The current input end of the three coils in the failed circuit is the first end, the output end is the wrong end, the three end ends are connected together, and the other three ends are connected to the three-phase power supply called star connection. Triangular star connection: The first end of each coil is connected to the other coil end to form three parallel terminals.

The connection of these three terminals to the three-phase power supply is called a three-phase star connection. The Y-type connection is also known as the star connection, the voltage of the winding is 220V, and the triangle connection is 380V, which is almost double.

If the motor junction box has a connecting piece, change the installation method of the connecting piece on the pin prudently, if there is no connecting piece dust macro, you should use a multimeter to distinguish the winding, and then judge the beginning and end, and then do the connection, and finally explain that the design of the loss brother respects the method of star connection of the motor below 3kw, can not use the triangle connection method to use the motor.

The physical diagram of the star connection and the triangle connection of the motor:

The star wiring method of the motor is: the six taps of the winding of the motor, the three-phase are separated according to the end of each group, and the tail end of the three-phase winding (that is, the end head) is connected together to form the point of the loop. The head of the three-phase winding of the motor (head wire) is the terminal and the power cord port.

The triangular wiring method of the motor winding is: the six taps of the three-phase winding of the motor, the head and tail of each phase of the three-phase winding of the three phases are clearly distinguished, and the head and tail of each phase winding of the three-phase winding are connected in parallel (that is, the head and tail of each phase of the three-phase are connected), and after the head and tail of each phase of the three-phase are connected, it is the terminal of the power supply.

Due to the small output power, the star connection method is often used for small power, large torque motors, or large power motors at the beginning, so that the loss of the machine is small, and the triangle connection is used after normal operation. This is what is often referred to as the star - the triangular priming. It should be noted that the original star-shaped motor can not be connected into a triangle, (if it is connected into a triangle, the phase voltage will rise to about a number of times, and the motor will inevitably be burned out after long-term operation).

The star connection method is equivalent to the stator winding has a certain series connection, and the phase voltage acting on the stator winding is 220V, while the delta connection method is equivalent to the stator winding has a certain parallel connection, and the voltage acting on the stator winding is 380V. For example, I want to design a 100W motor, we know that P=UI, the power is equal to the voltage multiplied by the current, I will now choose the corresponding voltage and current, for example, you can choose 1000V multiplied by the current. Obviously, this is impossible, because the 1000V voltage requires a high insulation level, the thickness of the enameled wire insulation layer should be very thick, and the 1000V voltage will produce current, and the enameled wire resistance will be very large, that is, the enameled wire is very thin, and it has to be wound around many times, which is unreasonable, and the most reasonable configuration may be 100V voltage multiplied by 1A current, so that the motor structure volume is the most reasonable.

Now there are only two options, 380V and 220V, and obviously I will choose 220V, which is the star connection.

In the same way, I am designing a 10kw motor, can I choose a 100V voltage multiplied by 100A current? Obviously, no, because at 100V to produce 100A current, the diameter of my enameled wire is very thick, and probably my optimal configuration is 500V voltage multiplied by 20A current. Now there are only two options, 380V and 220V, and obviously I will choose 380V, which is the triangle connection.

This sentence is the reason why the small motor chooses the star connection, while the large motor chooses the triangle connection.

Star connection in the motor junction box:

Connect the first end of the three-phase winding of the three-phase motor W1, U1 and V1, and the end U2, V2 and W2 are connected to the live wire respectively. It is to connect the upper row of the junction box, and the lower three are connected to the live wire, as shown in the figure below for the star connection in the motor junction box.

The star triangle start of the motor is the most common starting method of the asynchronous motor Because the starting current of the asynchronous motor is large during the start-up process, the motor with large capacity can use the "star triangle replacement start". This is a simple step-down start-up method, the stator winding is connected into a star shape at the start-up, and then connected into a triangle after the start-up, which can reduce the starting current and reduce its impact on the power grid. This starting method is called star-delta decompression start, or star-delta start for short.

There are several ways to do this.

1.Star wiring. In fact, it is to connect all the ends of the clicking coils together. It's U2, V2, W2! It is to connect U2, V2, and W2 together.

2.The triangle connection method is to connect U2 to W1, W2 to V1, and V2 to U1