Question

What is the frame used in the standard frames?

(a) set of standard values

(b) mechanical structure required to house a rotor of given outside diameter

(c) mechanical structure required to house a stator of given outside diameter

(d) mechanical structure required to house a stator of given outside length

The question was asked by my college director while I was bunking the class.

This intriguing question originated from Separation of D and L, Standard Frames topic in section General Concepts and Constraints in Design of Rotating Machines of Design of Electrical Machines

Answer 1

Right answer is (c) mechanical structure required to house a stator of given outside diameter

The explanation: The frame is a mechanical structure required to house a stator of given outside diameter. The frame also includes housing the bearings, end covers, terminal box and maximum length.