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SOLID STATE DRIVES UNIT-II CONVERTER / CHOPPER FED DC MOTOR

SOLID STATE DRIVES UNIT-II CONVERTER / CHOPPER FED DC MOTOR. Contents. Review of dc motor equivalent circuit DC motor speed control Converters used in dc motor drives. SCR “phase-angle controlled” DC drives. By changing the firing angle, variable DC output voltage can be obtained.

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SOLID STATE DRIVES UNIT-II CONVERTER / CHOPPER FED DC MOTOR

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  1. SOLID STATE DRIVESUNIT-IICONVERTER / CHOPPER FED DC MOTOR

  2. Contents • Review of dc motor equivalent circuit • DC motor speed control • Converters used in dc motor drives

  3. SCR “phase-angle controlled” DC drives • By changing the firing angle, variable DC output voltage can be obtained. • Single phase (low power) and three phase (high and very high power) supply can be used • The line current is unidirectional, but the output voltage can reverse polarity. Hence 2- quadrant operation is inherently possible. • 4-quadrant is also possible using “two sets” of controlled rectifiers.

  4. Single phase Full converter fed Dc drive

  5. Three phase converter fed DC drive

  6. Chopper fed DC drives • Supply is DC (maybe from rectified-filtered AC, or some other DC sources). • DC-DC converters (coppers) are used. • suitable for applications requiring position control or fast response, for example in servo applications, robotics, etc. • Normally operate at high frequency – the average output voltage response is significantly faster – the armature current ripple is relatively less than the controlled rectifier • In terms of quadrant of operations, 3 possible configurations are possible: – single quadrant, – two–quadrant and four–quadrant

  7. References G.K. Dubey, ‘Power semi-conductor controlled drives’, prentice hall of india,1989.

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