Research on high torque soft starter of induction motors based on discrete frequency

She, Zhiting; Liu, Juan; Zhang, Bin; Yong-jin, Peng

doi:10.1109/icicip.2010.5564276

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…There is high harmonic in each voltage and frequency division, the high harmonic leads to the waveform distortion. It will severely influence the other electrical devices in the same power network when the voltage is put to the motor directly [3]. The harmonic analysis of B phase voltage and C phase voltage is similar to A phase voltage, and the results is approximately the same.…”

Section: Fig2 a Phase Voltage Waveform At The 2 Nd Frequency Divisionmentioning

confidence: 82%

Harmonic Analyzing and Filtering of Motor Discrete Variable Frequency Soft Starter

Song

Chen

Wang

et al. 2015

AMM

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A large number of harmonic is mainly produced by with the discrete variable frequency soft starter. The harmonic during the motor soft starting is characterized by the high energy consumption and signal interference. Therefore, harmonic analyzing and filtering of motor discrete variable frequency soft starter is presented in this paper to achieve low energy consumption and ensure the motor soft starting stably. The following works have been done in the study: introduce the reason of harmonics appearance, analyze the harmonic, and present the filtering approach. The motor soft starter developed with this filtering approach has been successfully applied to filter out harmonic and to improve the starting performance when the motors draw the heavy-loads. It saves energy, stabilize the voltage of the power supply network.

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Section: Fig2 a Phase Voltage Waveform At The 2 Nd Frequency Divisionmentioning

confidence: 82%

Harmonic Analyzing and Filtering of Motor Discrete Variable Frequency Soft Starter

Song

Chen

Wang

et al. 2015

AMM

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show abstract

“…A, B, C-phase voltage and waveform are provided by the waveform generator to the six pulse generator. The six parallel pulses are accepted by three pairs of the counter-parallel thyristors which are conducted orderly leading to the motor starting smoothly [5,6,7]. The oscilloscope is used to observe the waveform of current and rotational speed.…”

Section: Simulation Model Of Motor Discrete Variable Frequency Soft S...mentioning

confidence: 99%

Modeling and Simulation of Motor Discrete Variable Frequency Soft Starting Based on the Variable Reactance

Song

Chen

Deng

et al. 2014

AMM

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The started motors are characterized by the low staring torque and large currents when the motors draw the heavy-loads. Therefore, a method of motor discrete variable frequency soft starting based on the variable reactance is presented in this paper [1,2]. According to the topological structure and working principle of motor discrete variable frequency soft starting based on the variable reactance, the simulation model of the system has been set up by the Matlab/Simulink tool. Simulation results show that the motor starters developed with this method have been successfully applied to the loads of the drive equipment in the kiln, coal grinding mill or the mine. It can improve the starting performance when the motors draw the heavy-loads., save energy, stabilize the voltage of the power supply network.

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“…Since the frequency of the grid voltage is constant, the operating point of the motor is relatively constant when using soft starters. To drive a motor using soft starters, there are phase control method [10]- [12], predictive control method [13]- [14], and DFC method [15]- [17]. In [10], a method of gradually increasing the applied voltage based on the preset rise time was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…This method can increase efficiency by minimizing losses because only two phases are used, but it has the disadvantage of requiring the motor parameters to be known in advance. In [15]- [17], a method of dividing the grid frequency and applying it to the motor was proposed. This method presented a new method that was different from existing other methods, but research on current limiting and comparing efficiency are still insufficient.…”

Section: Introductionmentioning

confidence: 99%

The Seamless Transition From Discrete Frequency Control to Phase Control Method Using Soft Starter

Jang,

Hyon,

Hwang

et al. 2024

IEEE Access

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Soft starters are used in a variety of industries to safely apply grid voltage to drive induction motors. The soft starter protect the motor from overcurrent and torque that occurs during starting of the motors by regulating the voltage applied to the motor. There are various methods to implement this soft starter, and among them, the discrete frequency control (DFC) method allows for simple operation, but research to limit the motor peak current is still insufficient. In this paper, a new method to limit the current and start the induction motor using the DFC was proposed. The proposed method calculates the feedforward component of the firing angle according to the speed command and add it to the output of additional controller to limit the current. The proposed method has the advantage of seamless transition to the phase control method when the speed command increases and can be implemented without structural change from the conventional phase control method. Using this method, it is implemented without motor parameter information, and the system efficiency is improved. The effectiveness of proposed method was verified through simulations and experiments.INDEX TERMS Soft starter, discrete frequency control (DFC), efficiency, induction motor.

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Research on high torque soft starter of induction motors based on discrete frequency

Cited by 15 publications

References 7 publications

Harmonic Analyzing and Filtering of Motor Discrete Variable Frequency Soft Starter

Harmonic Analyzing and Filtering of Motor Discrete Variable Frequency Soft Starter

Modeling and Simulation of Motor Discrete Variable Frequency Soft Starting Based on the Variable Reactance

The Seamless Transition From Discrete Frequency Control to Phase Control Method Using Soft Starter

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