Margin Angle Control of Synchronous Motors: The commutation Margin Angle Control of Synchronous Motors is defined as the angle measured from the end of commutation to the crossing of the phase voltage which was under commutation (natural firing instant). For satisfactory operation, without commutation failure, this margin angle must be greater than the turn off …
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 …
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: 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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Field Oriented Control of Three Phase Induction Motor: The stator current of an induction motor has the functions of producing the required air gap flux (magnetisation) as well as developing the required torque to drive the load. An Field Oriented Control of Three Phase Induction Motor motor will have its operation similar to that of …
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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 …
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 …
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 …
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 …
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 …