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B. Ramaswami

Bio: B. Ramaswami is an academic researcher. The author has contributed to research in topics: Thyristor drive & Inverter. The author has an hindex of 1, co-authored 1 publications receiving 6 citations.

Papers
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TL;DR: In this article, the development, design and construction of a variable speed drive using a synchronous motor is described, and the digital simulation based on simplified block diagram is accurate enough for obtaining the responses of the system to step changes in speed reference and load on motor.
Abstract: The development, design and construction of a variable speed drive using a synchronous motor is described in this paper. At first, the operation of motor with a current-fed, motor e. m. f. commutated inverter is explained. The working of control circuitry is explained next with the aid of logic and functional blocks. The power circuit, comprising the converter, inverter and motor has been reduced to simple blocks so that the controller design by hand computations becomes possible. It has also been shown that the digital simulation based on simplified block diagram is accurate enough for obtaining the responses of the system to step changes in speed reference and load on motor.

6 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a steady-state analysis of a three-phase induction motor fed by a DC link inverter commutated by machine-induced EMF is presented, where the active power requirement of the motor is met by the DC link, and the necessary reactive power is supplied by a capacitor bank connected at the motor terminals.
Abstract: A steady-state analysis of a three-phase induction motor fed by a DC link inverter commutated by machine-induced EMF (electromotive force) is presented. The active power requirement of the motor is met by the DC link, and the necessary reactive power is supplied by a capacitor bank connected at the motor terminals. A generalized analytical model is developed for no-load as well as loaded conditions of the motor. The steady-state performance of the motor is numerically evaluated. The computed results are compared with corresponding experimental results for a 4 HP squirrel cage induction motor. The relevant oscillograms of voltage and current waveforms of the inverter and motor are presented and discussed. >

17 citations

01 Jan 2013
TL;DR: In this paper, a brushless DC motor drive system with input shaping using classical control theory is analyzed using time response analysis and the relative stability of this drive system is determined by Bode Plot.
Abstract: The main objective of this work is to analyze the brushless DC (BLDC) motor drive system with input shaping using classical control theory. In this paper, different values of damping ratio are used to understand the generalized drive performance. The transient response of the BLDC motor drive system is analyzed using time response analysis. The dynamic behaviour and steady state performance of the BLDC motor drive system is judged and compared by its steady state error to various standard test signals. The relative stability of this drive system is determined by Bode Plot. These analysis spotlights that it is possible to obtain a finite-time setting response without oscillation in BLDC motor drive by applying input in four steps of different amplitude to the drive system. These analyses are helpful to design a precise speed control system and current control system for BLDC motor drive with fast response. The Matlab/Simulink software is used to perform the simulation. V : q-axis equivalent stator voltage in volts r qs i : q-axis equivalent stator current in amps s L : Equivalent stator self-inductance in henry s R : Equivalent stator winding resistance in ohms P : Number of poles of motor L T : Load torque of motor in N-m m B : Motor viscous friction coefficient in N-m/rad/sec m J : Rotor inertia of motor in Kg-m 2

6 citations

Journal ArticleDOI
TL;DR: In this paper, a microprocessor-based firing control scheme for the constant firing angle of the thyristors of the line commutated converter under a variable frequency source is presented.

4 citations

01 Jan 2014
TL;DR: In this paper, the root locus and root contours of the BLDC drive system are portrayed in order to focus on the complete dynamic response of the system and the steady state performance of the drive system has been investigated by calc ulating its steady-state error to various standard test signals.
Abstract: The demands for BLDC motor drives in industrial applications are rapidly increasing due to its high efficiency, high power factor and lower maintenance . Therefore, it is necessary to design a stable con trol system for BLDC drive system to achieve a quality p erformance. The stability is a major problem in the closed loop BLDC drive system which may cause oscillations of constant or changing amplitude. This paper spotlights the movements of characteristic ro ots of the drive system on s-plane with the variati on of system parameter gain ‘k’. The root locus and root contours of the BLDC drive system are portrayed in this paper which focuses the complete dynamic response of the system. Finally, the steady-state performance of the BLDC drive system has been investigated by calc ulating its steady-state error to various standard test signals. These analyses help a designer to easily v isualize the effects of varying various system para meters on root locations. These analyses give good potenti al design specifications for the control engineers. The Matlab software package is used to analyze the resu lts.

1 citations

Journal ArticleDOI
TL;DR: The optimal control system of BLDC motor drive is a design which spotlights in this paper based on quadratic performance index and helps to realize the BLDC system with practical components.
Abstract: The application of BLDC motor drives in industries is becoming more popular nowadays. An error will occur in the drive that is originated by some disturbances which are the major problems to reduce the stability of the system. To obtain the minimum performance index, the optimal control signal is formulated, which is the main objective of this paper. Based on quadratic performance index, the optimal control system of BLDC motor drive is a design which spotlights in this paper. The complexity of the mathematical expressions has been reduced by using state space approach to the BLDC system. The burden to the control engineers has reduced based on tedious computation by using thus optimal design. To provide the desired operating performance, this optimal design helps to realize the BLDC system with practical components.

1 citations