Induction Motor Drives

Braking of Induction Motor Drive

Braking of Induction Motor Drive: Following methods are employed for Braking of Induction Motor Drive: Regenerative braking Plugging or reverse voltage braking Dynamic (or rheostatic) braking further categorised as: ac dynamic braking self-excited braking using capacitors dc dynamic braking zero sequence braking Regenerative Braking: The power input to an induction motor is given by where […]

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Starting of Induction Motor Drives

Starting of Induction Motor Drives: Starting of Induction Motor Drives arrangement is chosen based on the load requirements and nature of supply (weak or stiff). It may be required to have following features: Motor should develop enough starting torque to overcome friction, load torque and inertia of motor-load system, and thus, complete the starting process

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Harmonic Equivalent Circuit of Induction Motor

Harmonic Equivalent Circuit of Induction Motor: When fed from an inverter or cycloconverter, the motor terminal voltage is non-sinusoidal but it has half-wave symmetry. A non-sinusoidal waveform can be resolved into fundamental and harmonic components using Fourier analysis. Because of half-wave symmetry only odd harmonics will be present. The Harmonic Equivalent Circuit of Induction Motor

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Unbalanced Rotor Impedance Operation

Unbalanced Rotor Impedance Operation: Earlier Unbalanced Rotor Impedance Operation were employed for starting and speed control. They are not in use any more. However, a loose contact in the rotor circuit can cause unbalance in the rotor resistance. It is therefore useful to examine the effect of unbalance on motor performance. Unbalanced Rotor Impedance Operation

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Unbalanced Source Voltages Operations

Unbalanced Source Voltages Operations: As Supply voltage may sometimes become unbalanced, it is useful to know the effect of Unbalanced Source Voltages Operations on motor performance. Further, motor terminal voltage may be unbalanced intentionally for speed control or starting as described later. A three-phase set of Unbalanced Source Voltages Operations (Va,Vb and Vc) can be resolved

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Three Phase Induction Motors

Three Phase Induction Motors: Three Phase Induction Motors are of two types: squirrel-case and wound-rotor. In squirrel-cage, the rotor consists of longitudinal conductor-bars shorted by circular connectors at the two ends while in wound-rotor motor, the rotor also has a balanced three-phase distributed winding having same poles as stator winding. However, in both, stator carries

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