I think it may be useful to add the following explanation:
1. Polyphase systems were originally introduced to solve the problem of severe vibration when single-phase generators were loaded inductively. Balanced polyphase systems make reactive loads draw power from the generator at a uniform rate so that the machine runs smoothly when driven with a uniform torque.
2. All the advantages of polyphase systems are available when three phases are used and generally there is little to be gained by using more than three.
The above information is in the Services Textbook of Electrical Engineering.
I think it may be useful to add the following explanation:
1. Polyphase systems were originally introduced to solve the problem of severe vibration when single-phase generators were loaded inductively. Balanced polyphase systems make reactive loads draw power from the generator at a uniform rate so that the machine runs smoothly when driven with a uniform torque.
2. All the advantages of polyphase systems are available when three phases are used and generally there is little to be gained by using more than three.
The above information is in the Services Textbook of Electrical Engineering.
