Structure diagram of drum washing machine motor drive circuit

Structure diagram of drum washing machine motor drive circuit

Shown is the structure diagram of the motor drive circuit of the drum washing machine . The motor used in this circuit is a two-speed motor, with
2 sets of windings installed in the motor. During the washing process, the low-speed winding works to drive the drum to wash the clothes, so it can also be called the washing motor winding
. During the dehydration process, the high-speed winding works to drive the drum to run at high speed and throw out the moisture in the clothes. Therefore, it can also be called a dehydration motor
winding.
    The two-speed motor consists of 2 sets of windings, of which the l2 supply winding is the washing motor winding and consists of three types of windings: main winding, auxiliary winding and common winding
. The 2-pole winding is the dehydration motor winding, which consists of two types of windings: the main winding and the auxiliary winding.
    The main and auxiliary windings of the washing motor winding control the forward and reverse direction of the motor, so they have the same wire diameter, number of turns, pole pitch and pitch
. The wire diameter, number of turns, pole pitch and pitch of the common winding are different from those of the main and auxiliary windings. These three types of windings adopt Y-shaped connection method, and the three types of windings are at an angle of 1200
degrees.
    The dehydration motor winding can only run in one direction, so there is a clear difference between the main and auxiliary windings. The main winding has a thick wire diameter, a small number of turns, and
a small DC resistance value; the secondary winding has a thin wire diameter, a large number of turns, and a large DC resistance value.
    The common ends of the two sets of motor windings are connected together to form the common end of the two-speed motor. Two-speed motors use a starting capacitor
controlled by the contact pads of a programmable controller. When the washing motor winding (12-pole winding) is connected, the washing machine drives the drum to run at low speed to complete
the washing function. When the dehydration motor winding (2-pole winding) is connected, the washing machine drives the drum to run at high speed to complete the dehydration function. And
controlled by the program controller, the two sets of motor windings are interlocked with each other, and the two sets of motor windings are not allowed to be connected and operated at the same time.
    In addition to the electric motor that drives the pulsator disc shaft, there is also a synchronous motor in the electric program controller. The working environment and characteristics of this motor
require a motor with small size, low power and stable speed, so permanent magnet DC motors are usually used .