Vector Control of an Induction motor

Vector Control of an Induction motor: Vector Control of an Induction motor – The sole idea behind the vector control of induction motor is to have an electrical drive which must offer superior performance than widely used separately excited dc motor in industry. Further such a drive should also emerge as a robust, reliable, maintenance […]

Forced Commutation

Forced Commutation: It was observed from the discussion on choppers and inverters that in thyristor systems fed from dc supply, the forward current does not pass through zero naturally and must therefore be forced to become zero at appropriate instants by means of auxiliary circuitry, called the commutation circuit. Apart from forcing the forward current […]

Sinusoidal Pulse Modulation

Sinusoidal Pulse Modulation: In Sinusoidal Pulse Modulation the pulse-width instead of being uniform as in the waveform of Fig. 11.55 is a sinusoidal function of its angular position with respect to a reference sine wave resulting in a reduction in the harmonic content. The control function consists of a sinusoidal wave obtained from an oscillator […]

Voltage and Harmonic Control of Inverters

Voltage and Harmonic Control of Inverters: In applying Voltage and Harmonic Control of Inverters for motor control both V andf(keeping V/fconstant) need to be varied. Further, the inverters apply essentially nonsinusoidal ac voltage to the motor. External filter circuits cannot be employed due to the difficulty in operating inverters over a wide range of frequencies. […]

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