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Frame of induction motor is made of
Silicon steel
Cast iron
Aluminum
Copper
Cast iron
The frame (or yoke) of an induction motor is typically made of cast iron to provide the necessary mechanical support and structural rigidity to the motor assembly. It acts as a protective housing for the stator core and windings while providing a low-reluctance path for the magnetic flux.
The frame (or yoke) of an induction motor is typically made of cast iron to provide the necessary mechanical support and structural rigidity to the motor assembly. It acts as a protective housing for the stator core and windings while providing a low-reluctance path for the magnetic flux.
PeтАЛ=KeтАЛBm2тАЛf2t2 тАФ Eddy current loss formula for the stator core
╬ж=4.44fNVтАЛ тАФ Magnetic flux relation in the stator
The motor frame provides mechanical protection to the internal components. In smaller machines, it is often cast as part of the body, whereas in large machines, it is fabricated from steel plates. While it does not participate in the active electromagnetic energy conversion, it houses the stator core, which is laminated with silicon steel to minimize eddy current losses (PeтАЛ=KeтАЛBm2тАЛf2t2).
Cast iron provides high compressive strength and vibration damping.
The stator core, housed inside the frame, uses silicon steel laminations to reduce hysteresis and eddy current losses.
The frame protects the internal components from environmental factors.
For very large machines, fabricated steel is used instead of cast iron to reduce total weight.
High structural rigidity
Excellent vibration damping properties
Cost-effective for mass production
Heavy weight compared to aluminum or fabricated steel
Brittle nature compared to steel
Industrial conveyor systems
Pump and fan drives
General purpose induction motors
Cast iron is chosen primarily for mechanical stability; silicon steel is used for the magnetic circuit (stator core).
Aluminum is sometimes used for frames in smaller motors to reduce weight (die-cast frames), but cast iron remains the standard for durability in larger industrial motors.
B is correct тАФ Cast iron is the preferred material for the frame of an induction motor due to its mechanical strength and vibration damping characteristics.
Always differentiate between the frame (mechanical support) and the stator core (magnetic path). The frame is for structural integrity, while the core requires high-permeability, low-loss material like silicon steel.