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Motor Control

Single Phase Bridge Inverter

Single Phase Bridge Inverter: A serious disadvantage of the half-Bridge Inverter of Fig. 11.46 is that it requires a 3-wire dc supply. This is overcome by the commonly employed Single Phase Bridge Inverter circuit of Fig. 11.48(a) which needs four thyristors and four free-wheeling diodes. The sequence of thyristor gating and the output waveforms are shown …

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Static Kramer Drive

Static Kramer Drive: The Static Kramer drive system which consists of variable-speed drive system shown in Fig. 11.43 consists of a slipring induction motor and a rectifier-fed dc motor. The machines are connected electrically in cascade. The slip power recovery takes place through the rectifier and the auxiliary dc motor. Torque supplied to the load …

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Static Scherbius Drive Circuit Diagram

Static Scherbius Drive Circuit Diagram: A basic scheme of a Static Scherbius Drive Circuit Diagram converter cascade, that is employed for recovery of slip power in electrical form itself, is given in Fig. 11.42. For achieving both subsynchronous and supersynchronous speed control, converters C1 and C2 must be fully-controlled thyristor bridges, one functioning at slip …

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Three Phase Semi Converter feeding Separately Excited DC Motor

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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DC Motor Control through Converters

DC Motor Control through Converters: DC motor control is conveniently and efficiently achieved by phase-controlled converters wherein the ac input voltage is converted to a controlled dc output. The commutation process, the transfer of current from one thyristor to the other, in these converters is the inexpensive natural or line commutation. As, an incoming thyristor is …

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Thyristor Control of Motors

Thyristor Control of Motors: Thyristor Control of Motors – A variety of thyristor control circuitry has been devised for use in motor control depending upon the type of supply (ac/dc) and the type and size of the motor. For dc motor control, controlled dc power from a constant voltage ac supply is obtained by means …

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