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Can you explain in detail the single-phase motor forward and reverse wiring diagram and control?

A general single-phase motor forward and reverse wiring diagram

In a single-phase motor, the main winding is usually larger in wire diameter, smaller in resistance and smaller in number of turns. However, some forward and reverse single-phase motors do not have a main and secondary winding.

The following figure: 1 (2) of the main coil connected to the secondary coil of the 2 (1), so that the positive transmission. In turn 1(2) of the main coil is connected to 1(2) of the secondary coil, so that it is reversed.

Two, the simplest single-phase motor forward and reverse wiring diagram

A single-phase motor, the work of the need for him to forward and reverse, but using the above approach, it is more troublesome to realize the automatic control, the need for devices is also more, so there is a single-phase motor, do not distinguish between the main and secondary coils, that is, the main and secondary coils are the same parameter, the main and secondary coils do not distinguish between this kind of single-phase motor, in addition to this approach with the above The method can also be used in accordance with the following figure using a single-pole double-throw switch to control forward and reverse.

Three, single-phase motor terminal identification

1, for only two terminals of the motor, the internal circuit has been connected, can not control forward and reverse.

2, for the motor with three terminals, control of forward and reverse generally need to first identify the terminals, and then in accordance with the above two ways for wiring control. Generally can be judged in accordance with the following methods:

a, first two two measurements of the resistance of the three lines, remember the maximum value of the two lines and their resistance, the third line is the main and vice of the connection point;

b, respectively, the measurement of the contact point and the resistance of the two terminals (the sum of the two resistances must be equal to the above maximum value). The smaller resistance is the main winding, the larger resistance is the secondary winding.