Three-phase asynchronous motor using a multimeter to find and connect to the triangle method
Let's set up each pole-phase group, no matter how many poles your motor is, each group of coils has a "head" and "tail", the definition of "head and tail" is in accordance with the direction of the current. The definition of "head and tail" means that the direction of the current is the same for all the coils. After connecting all the phases in series, we are left with six wires, i.e. each phase has a "head" and a "tail". We define the head of the first item as number 1, the head of the second item as number 2, the head of the third item as number 3, the tail of the first item as number 4, the tail of the second item as number 5, and the tail of the third item as number 6. In order to ensure that the difference in phase is 120 degrees, we will switch the definitions of the head and tail of the second item.
If it is lower than 3KW motor, we can connect the tail in series, connected to the star, if higher than 3KW motor we have to the first parallel connection connected to the corner, the corner of the line sequence is 1 and 6 parallel, that is, the first head and the third item of the tail parallel; 2 and 4 parallel, that is, the second head and the first item of the tail parallel; 3 and 5 parallel, that is, the third head and the second head and the second item of the tail parallel. Each of the three groups is connected to three-phase electricity, which is an angle connection. If the motor has a 6-position terminal block, as shown below, just connect the wires according to this definition and then connect them in phase with the copper tabs.
Use a multimeter to measure the three machine phase group, DC resistance value is the same big, in accordance with the above way to find the head and tail can be, three head in the motor inside against one side, three tail in the relative position against one side, it is easy to find.
The simplest is to use the multimeter on and off gear to measure the six wires between the two, through the instructions are the same set of windings to find out the head and tail of the three groups, the same letter of the 1 and 2 for the head and tail, and then define the upper end of the W2,U2,V2 lower end of the U1,V1,W1,.
