Soft Starting of Induction Motor with Torque Control

Nied, Ademir; Oliveira, José de; Campos, Roger Francisco de; Dias, Rogério Pinho; Marques, Luiz Carlos de Souza

doi:10.1109/08ias.2008.212

Cited by 9 publications

(17 citation statements)

References 14 publications

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“…Also, lately, a particular interest is dedicated to communication skills of the drive system with a central monitoring, control and diagnostics centre. That enables an easy integration of the drive into so called expert systems in modern industrial facilities [15][16][17][18][19][20][21][22][23].…”

Section: Discussion and Remarksmentioning

confidence: 99%

“…, the starting time of the motor can be analytically predicted by considering the Klöss relationship [16][17][18][19][20]: . It can be demonstrated [18][19][20][21][22][23][24][25][26] that the first operating point, characterized by the slip s 1 , is a stable one, imposing the steady state of the machine.…”

Section: Considering the Resisting (Load) Torque Zeromentioning

confidence: 99%

“…If one neglects the no load current, the current absorbed by the stator during the start-up equals the value of the rotor current. Using the Klöss relation, the stator current induction motor current becomes [13,14]: Therefore, the current variation absorbed by the motor during the start-up process is described by the relation:   . One may note that the value of current absorbed by the motor tends asymptotically towards a stabilized value, corresponding to the steady-state slip: The above relationship is more a quantitative estimation because both torques are not constant during the start-up process.…”

Section: Considering the Resisting (Load) Torque Zeromentioning

confidence: 99%

“…For motors with higher power units, one may apply, depending on power level the machine and its operating mode, the following classical procedures [1][2][3][4][5]: star-delta starter, rheostat starters, series stator coils, autotransformer starter, or more recently, the usage of static power converters [8][9][10][11][12]. For motors driven by variable-frequency drive, energising is performed implicitly with a voltage-frequency control [9][10][11][12][13][14][15].…”

Section: The Motor Inrush Current Controlmentioning

confidence: 99%

“…The inrush currents associated with the motor connection to the network have values that could exceed the motor rated currents and exhibit special distorted waveforms [7][8][9][10][11][12][13]. These features of these inrush currents additionally stress up both the motor by increasing the losses within the motor and the supply network by adversely affecting the other loads or receptacles, connected at the common coupling point [14][15][16][17]. This paper is going to qualitatively and quantitatively investigate the starting process when the machine is not or light loaded.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Transient State Characterization of Asynchronous Motors in Modern Low-Voltage Electric Installations

Cazacu

Ioniţă

Petrescu

2018

The Scientific Bulletin of Electrical Engineering Faculty

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Low-voltage asynchronous motor is the most common load used in any industrial electric facility. Due to their robustness and reliability, the induction motors have a very large application spectrum and are to be found in a variety of power units. It is assumed that over 70% of total energy used in any electric utility is dedicated to the electric motor drive systems. The paper quantitatively studies the transient state of such motors, which occurs at their start-up. The waveforms characteristics of these inrush currents are predetermined mainly by solving the associated differential equations that describe the dynamic phenomena at their start-up. An experimental investigation on an induction motor of 4 kW is also carried out. Supplementary, different solutions for the energising of these low-voltage motors are presented highlighting their performances and limits. These methods are critically rated according to their mitigation ability of the power quality issues associated with the energizing process.

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Section: Discussion and Remarksmentioning

confidence: 99%

Section: Considering the Resisting (Load) Torque Zeromentioning

confidence: 99%

Section: Considering the Resisting (Load) Torque Zeromentioning

confidence: 99%

Section: The Motor Inrush Current Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transient State Characterization of Asynchronous Motors in Modern Low-Voltage Electric Installations

Cazacu

Ioniţă

Petrescu

2018

The Scientific Bulletin of Electrical Engineering Faculty

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Optimal starting frequency of three‐phase induction motor

Chen

2021

IET Electric Power Appl

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In its applications, the starting performance of a 3-phase induction motor (IM) is very important. The starting torque of the motor should be as high as possible within the safe current range of the motor driver. In the study, the optimal frequency for motor starting is derived from the frequency characteristic of the IM. Through the analysis of the characteristics, the optimal frequency point can be found, which is able to generate the maximum torque per unit drive current. Both theoretical analysis and experiments show that the IM with the optimal starting frequency can generate the maximum torque for a given current. The traditional methods, such as soft-start, can reduce the starting current, but at the expense of lowering starting torque. This starting technology can solve the problem caused by traditional methods, improve the starting performance of the motor system significantly, and lower the requirement for the current redundancy of the motor driver effectively. K E Y W O R D Sinduction motor, optimal starting frequency, optimal starting torque per ampere, starting performance, starting torque, T-type equivalent circuitThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Current limiting soft starter for three phase induction motor drive system using PWM AC chopper

Deraz

Azazi

2017

IET Power Electronics

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This study presents a new current-limiting soft-starter for a three-phase induction motor drive system using pulse width modulation (PWM) AC chopper. A novel configuration of three-phase PWM AC chopper using only four insulated gate bipolar transistors (IGBTs) is also proposed. The proposed control strategy does not require zero crossing detection circuits, which employed in thyristorised soft starters. It requires only one current sensor. The duty ratio of the chopper IGBTs is obtained from the closed-loop current control in order to limit the motor starting current at a preset value. Only two complementary gate pulses are obtained from the control circuit to control the four IGBT switches. The proposed control strategy is characterised by a simple control loop; thus, a low-cost processor can be used due to the low-computation burden. The superiority of the proposed strategy is proved theoretically and confirmed experimentally. The experimental work is developed using a laboratory prototype system composed of DSP-DS1104 digital control board and 1.5 HP induction motor. The proposed starter offers a smooth start-up for the motor speed, torque ripple minimisation, less number of semiconductor switches, less switching and conduction losses, less harmonics and improved input power factor.

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Soft Starting of Induction Motor with Torque Control

Cited by 9 publications

References 14 publications

Transient State Characterization of Asynchronous Motors in Modern Low-Voltage Electric Installations

Transient State Characterization of Asynchronous Motors in Modern Low-Voltage Electric Installations

Optimal starting frequency of three‐phase induction motor

Current limiting soft starter for three phase induction motor drive system using PWM AC chopper

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