Category: ELECTRICAL MACHINES

Three Phase Bridge Inverter

Three Phase Bridge Inverter: Three Phase Bridge Inverter – The basic 3-phase inverter is a six-step inverter. A step is defined as a change in the firing sequence. A 3-phase thyristor bridge-inverter is shown in Fig. 11.49. Th1 to Th6 are the six load-carrying thyristors while D1 to D6 are the free-wheeling diodes. Each pair […]

Single Phase Bridge Inverter

Single Phase Bridge Inverter: A serious disadvantage of the Single Phase Bridge Inverter of Fig. 11.46 is that it requires a 3-wire dc supply. This is overcome by the commonly employed full-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 […]

Single Phase Half Bridge Inverter

Single Phase Half Bridge Inverter: Figure 11.46(a) gives the circuit configuration of a Single Phase Half Bridge Inverter. It has two thyristors and two free-wheeling diodes. Each thyristor is gated at frequency f= 1 /T of the ac supply desired. The gating signals of the two thyristors have a phase angle of 180°. From Fig. […]

Phase Control of Induction Motor

Phase Control of Induction Motor: Figure 11.44 shows the schematic representation of  3 Phase Control of Induction Motor. Two thyristors are connected in antiparallel in each line. The firing sequence of the thyristors for all modes of operation is 1, 3′, 2, 1′, 3 and 2′ as shown in Fig. 11.45. The interval between successive […]

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