Development Of High Efficiency Brushless DC Motor With New Manufacturing Method Of Stator For Compressors

To promote energy saving, we developed a high efficiency brushless DC motor with a new manufacturing method of a stator for compressors. This motor consists of a concentrated winding stator and an interior permanent magnet rotor. The stator has the core structure that we call “a joint-lapped core”. The joint-lapped core is able to open and bend in reverse. While winding the coil, the joint-lapped core is bent in reverse on the connecting joint axis. The coils are wound around the teeth in aligned position. After that, it is bent to form cylindrical core shape. This manufacturing method reduced copper loss. Furthermore, we adopted a 6-pole motor in place of a conventional 4-pole. As a result, iron loss was also reduced, and the high efficiency brushless DC motor was achieved. The noise was also been reduced because of the 6-pole motor.