LG GR-K192AF Service Manual - Page 48

Characteristics of each part 9-1-5. Motor (mechanical room) (1) Function • Motor cooling (mechanical room) This is the part used for circulating the air within the mechanical room and applies to the wire condenser type. This operates when the compressor operates and the heated refrigerant from the compressor lowers the temperature when passing through the wire condenser and also reduces the temperature of the compressor to improve the performance. (2) Operating principle and characteristic • Characteristic The motor applied to the refrigerator is the shading pole motor of the inductive motors. As shown below, it is a 2 pole device with one pole composed of 2 parts. On the small pole called the shading pole, wire is connected (shorted) called the shading coil. In accordance with the characteristics of the AC motor, the motor switches between + and - to operate but because in the 2 pole device, the N and S pole changes within both poles without left and right rotation, the device cannot rotate without help from an external device. Therefore the shading pole and coil creates the rotating direction for operation. The shading pole motor cannot rotate in reverse direction. Therefore the rotating direction must be set during assembly to rotate in the desired direction. Main coil Shading Pole Stator Shading Coil Rotor Bobbin part - 48 -