Microprocessors and Control of Electric Drives

Inverter Control using Terminal Voltage Sensing

Inverter Control using Terminal Voltage Sensing: The Inverter Control using Terminal Voltage Sensing of the synchronous motor is obtained using the triggering pulses to the inverter which are synchronized with the rotor position. These signals are obtained by processing the phase reference signals P1,P2,P3 and a high frequency signal S4 obtained from a shaft encoder. This shaft encoder …

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Microprocessor Control of a Current source Inverter Fed Synchronous Motor

Microprocessor Control of a Current source Inverter Fed Synchronous Motor: A drive system employing a Current source Inverter Fed Synchronous Motor has the following features: A four quadrant drive can be accomplished very easily. A self control, which synchronises the gating pulses of the inverter with rotor position, provides an improved steady-state and dynamic performance. …

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Microprocessor Control of Synchronous Motor Drives

Microprocessor Control of Synchronous Motor Drives: Variable speed drives employing Microprocessor Control of Synchronous Motor Drives are becoming very popu­lar in industrial applications. They are an immediate solution for high power reversible drives and are becoming competitors to dc and induction motor drives. The Microprocessor Control of Synchronous Motor Drives operates at leading power factors …

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Control of DC Drives Using Microprocessors

Control of DC Drives Using Microprocessors: The dc motors fed from thyristor converters for variable speeds are being ex­tensively used in general industrial applications. A dual converter, which is a combination of two antiparallel connected three phase/single phase bridge converters, provides a reversible Control of DC Drives Using Microprocessors with regenerative facilities. The re­sponse of …

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Function Generation and Linearisation

Function Generation and Linearisation: An important aspect of the closed loop control system is the use of Function Generation and Linearisation, e.g. in the control of induction motors there exists a definite non­linear relationship between the stator current and slip frequency to maintain a constant air gap flux. The function generation can be easily carried …

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Feedback Control in Drive System

Feedback Control in Drive System: Feedback Control in Drive System – A closed loop control of a variable speed drive system employing thyristor power converters is normally a discrete time system when a microprocessor is implemented for control purposes The system may be linear or non-linear The power converter itself is a discrete time system …

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Gate Firing Converters

Gate Firing Converters: The firing pulse control unit constitutes the heart of any thyristor power con­verter. The Gate Firing Converters required by the thyristors are often derived from the digital pulses using a simple buffer unit. Analog firing controllers are used in systems with dedicated hardware. They are recommended for constant low frequency operation where …

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Speed Detector

Speed Detector: One important factor in the closed loop control of variable speed drives em­ploying solid state converters is the Speed Detector. In the dedicated hardware control using analog components, the speed sensing is accomplished by means of tachogenerator. For control of the drive using a microprocessor, this ana­log speed signal can be converted to …

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