ELECTRIC DRIVES

Stepper Motor Classification

Stepper Motor Classification: The Stepper Motor Classification based on the construction and principle of operation. These are Variable reluctance motors Permanent magnet motors Hybrid stepping motors Claw pole motors with permanent magnets The stepper motors are used for linear motors also. These are also classified as ‘variable reluctance motors’ and ‘permanent magnet motors’. Variable Reluctance […]

Margin Angle Control of Synchronous Motors

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

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

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. […]

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 […]

Field Oriented Control of Three Phase Induction Motor

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 […]

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 […]

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 […]

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 […]

Applications and Functions of Microprocessors in Electric Drives

Applications and Functions of Microprocessors in Electric Drives: With the remarkable progress in the area of microelectronics, reliable and powerful microprocessors have come to be more widely used in the control of electrical drives. A few of the Applications and Functions of Microprocessors in Electric Drives can be listed as follows: Static Ward Leonard control […]

Hardware Systems Versus Microprocessor Control

Hardware Systems Versus Microprocessor Control: The Hardware Systems Versus Microprocessor Control control of electric drives offers the following advantages when compared to the dedicated hardware control. As has already been discussed, the use of microprocessors reduces the com­plexity of the system. The software supported control using microprocessors to perform the functions of controllers eventually result in […]

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