COPPER BRASS ROTORS
Four types of rotor construction exist today: aluminum die cast (ADC), copper die cast (CuDC), fabricated aluminum bars (AlBar), and fabricated copper bar (CuBar). In general, only the aluminum die-cast, fabricated aluminum, and copper bar rotors are in common use today
The aluminum conductors' electrical resistance could be reduced by simply increasing their thickness, just as using thicker wires in the stator lowers resistance there. Unfortunately, changing the size of the aluminum conductors makes it necessary to change the size and shape of the slots in the laminations through which the aluminum is die cast, and that change would alter the rotor's magnetic properties, making the rotor (and the entire motor) larger.
- Advanatages of Copper Brass Motors are as follows:
- Energy conservation as a result of high efficiency over the entire performance including part load
- The speed torque course is significantly steeper.
- Higher maximum motor performance thanks to a greater number of revolutions at the tipping point.
- Lower additional losses
- A smaller construction volume as compared to an aluminium rotor motor of equal power and efficiency