BLDC MACHINE

 

 

 

The introduction of flux barrier in typical single phase BLDC motor (SS Series) has overcome the limitation of parallel magnetic circuit. However, there is still small amount of leakage flux occurred in the SS Series. Therefore, additional stator is introduced in the rotor side known as double stator. Since it used similar permanent magnet magnetization direction compared with SS Series, it also has parallel magnetic circuit. This new arrangement of magnetic circuit is known as Slotted Rotor Double Stator as shown in Figure 1

                                                                                                                

 

 

 

 

 

 

In Slotted Rotor Double Stator, the unused magnetic circuit in the rotor is connected to the air gap and another source of coil as shown in Figure 2. Even though this double stator is costly for fabrication, the optimum value of produced torque production can be achieved. It has series magnetic circuit per pole. The magnetic circuits are on the outer stator side and in the inner stator side. The outer stator, inner stator and rotor are made of ferromagnetic material. The permanent magnet is arranged back to back to produce differences pole for each slot in stator similar to the single stator topology.