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Dual Converter Control of DC Separately Excited Motor

DC Motor Drives, Fundamentals of Electrical Drives

Dual Converter Control of DC Separately Excited Motor: A Dual Converter Control of DC Separately Excited Motor (Fig. 5.35) consists of two fully-controlled rectifiers connected in anti-parallel across the armature. For power ratings upto around 10 kW, sigle-phase fully-controlled rectifiers can be used. For higher ratings, three-phase fully controlled rectifiers are employed. Rectifier A, which …

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Performance of DC Motors Operating on Phase Controlled Converters

Control of Electric Motors

Performance of DC Motors Operating on Phase Controlled Converters: The nature of the output voltage and output current of a phase controlled converters impains the performance of the dc motor operating on these con­verters. The output of the converter is in the form of pulses. The average voltage is superimposed by an ac ripple which …

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Three Phase Semi Converter feeding Separately Excited DC Motor

Electrical Machines, Motor Control

Three Phase Semi Converter feeding Separately Excited DC Motor: Large-kW motors are fed from 3-phase supply through three Phase Converters. In a three Phase Semi Converter, the ripple frequency of the motor terminal voltage is higher than that in the single-phase converter, as a result the filtering requirements for smoothing out the motor current are …

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High Voltage DC Transmission Interview Questions and Answers

Electrical Power Engineering Interview Questions and Answers, Interview Questions and Answers

High Voltage DC Transmission Interview Questions and Answers: 1. Why is voltage regulation better in case of dc transmission ? Ans. Because of absence of inductance in dc systems. 2. Why there is no limit on the length of the cable for dc system while it is in case of ac system ? Ans. Because …

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Power Converters Interview Questions and Answers

Electronics Engineering Interview Questions and Answers, Interview Questions and Answers

Power Converters Interview Questions and Answers: 1. What is freewheeling diode? Ans. Freewheeling diode is a bypass or commutating diode. It is connected across motor terminals to allow for dissipation of energy stored in motor inductance and to provide for continuity of motor current when the thyristors are blocked. It also provides protection against transient overvoltages. …

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Digital to Analog and Analog to Digital Converters Interview Questions and Answers

Electronics Engineering Interview Questions and Answers, Interview Questions and Answers

Digital to Analog and Analog to Digital Converters Interview Questions and Answers: 1. Why conversion of an analog signal into an equivalent digital signal is essential? Ans. Because most sensors have analog output while much data processing is accomplished with digital computers, analog-to­-digital conversion is essential. 2. What is digital-to-analog conversion? Ans. Basically, D/A conversion is the …

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Three Phase Cycloconverter Circuit Diagram and its Workings

Electronics Engineering, Power Converters

Three Phase Cycloconverter Circuit Diagram and its Workings: A cycloconverter converts ac at one frequency to an ac of another frequency. Cycloconverters can be classified as single-phase to single-phase, three-phase to single-phase and three-phase to 3-phase devices. They can also be classed as step-up and step-down cycloconverters. A step-up cycloconverter provides an output whose frequency …

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