Electric Machine Design : Concepts - 3

DESIGN AND CONSTRUCTIONAL FEATURES OF A ROTATING MACHINE

(A) Design of Rotating Machine:

1. Specification of Rotating Machine:

Rating according to standard, loading type, frame size, starting method, temperature rise, efficiency.

2. Performance of Rotating Machine:

Starting torque, transient behavior, system considerations, no load characteristics, short circuit characteristics, forces under short circuit, losses, optimization.

3. Manufacture of Rotating Machine:

Material procurement, handling and processes, skill and talent, transportation to site.

(B) Constructional features of Rotating Machine:

1. Cores of Rotating Machine:

Material, stator and rotor stampings, clampings, insulation, flux density, core loss, weight.

2. Slots and teeth of Rotating Machine:

Suitable combination, size, space factor, flux density, insulation, core loss, mechanical forces.

3. Windings of Rotating Machine:

Type, current density; conductors, turns, layers strands, insulation, transposition, resistance, I2 R loss, leakage reactance, connections, temperature rise, cooling, slip-rings, commutator, weight

4. Frame of Rotating Machine:

Size, rigidity, fixing, enclosure-type, vibration, weight.

5. Shaft of Rotating Machine:

Size, stiffness, deflection, speed.

6. Bearings of Rotating Machine:

Type, loss, cooling, lubrication.

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