PWM Inverter Drive for Modified Single Phase Induction Motors

International Journal of Electronics and Electrical Engineering

Squirrel Cage Induction Motors are the widely used motors for industries due to its robust design, simple construction and low operational costs. The squirrel cage induction motor fed into Sinusoidal Pulse Width Modulation (SPWM) inverter presents the greater advantages on cost and energy efficiency as compared with other industrial solutions for varying speed applications. In the present paper, an open and closed loop 0.5HP, 50Hz, 1725rpm squirrel cage induction motor fed into PWM inverter has been developed and analyzed in the recent MATLAB/Simulink environment. It has been observed from the obtained results of open and closed loop models, the closed loop model gives better results as compare to open loop with reduced harmonics. Four signature parameters of motor have been considered for the analysis purpose in both models (open/close). These are stator current, rotor current, rotor speed and developed electromagnetic torque. The torque control method has been used for controlling the induction motor in closed loop due to its advantages over field-oriented control method.  Index Terms-open loop model, close loop model, induction motor, PWM inverter, MATLAB/Simulink

2015

Abstract— VVVF drives are widely used for speed control of induction motor in many Industries. Phase angle voltage controlled technique is mostly implied for soft start of induction motor however it suffers from drawbacks like retardation of the firing angle which causes lagging power factor at the input side especially at lower speed. In this paper, a new variable voltage control technique is proposed which uses only two high frequency PWM controllable switches for speed control of Induction motor .This method will be suitable for fan, pump and blower load coupled to a single phase induction motor which is used in almost all industries. The advantages of proposed method are its high power factor, high efficiency and less power consumption.The control technique used is easy and convenient. The technique used is economical and can be used in domestic and industrial Applications.

This paper conclude speed control of induction motor the induction motor are use in the industrial drives because they are self starting, reliable and economical they use in the fix and variable speed. The voltage and frequency are varies speed are also varies. This present performance and evaluation of voltage source inverter feed induction motor drive. By varying stator terminal voltage from voltage source inverter. The model are PWM system use to vary voltage and frequency. PWM-Inverter fed 3-phase Induction Motor, and the Torque was found to be constant for various rotor speeds. PWM-Inverter fed 3phase Induction Motor. It was observed that using a Closed-Loop scheme with a Proportional Controller gave a very superior way of controlling the speed of an Induction motor while maintaining a constant maximum torque. Simulation results are obtained using MATLAB/SIMULINK environment for the effectiveness of the study. International Research Journal of Engineering and Technology (IRJET) e

American Journal of Applied Sciences, 2006

An inverter-three-phase squirrel-cage induction motor drive system with improved mechanical characteristics is presented. The proposed system provides mechanical characteristics with constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency. The control algorithm is based on the constant volts per hertz principle using two improvement techniques: keeping maximum torque constant or keeping magnetic flux constant. Performance analysis of the system under different operation conditions was provided. For this purpose, a standard state-space model of three-phase squirrel-cage induction motor, with respect to a synchronously rotating d-q reference frame was derived. The correctness and validity of the derived model of induction motor was verified. The inverter was considered as a static linear element and modeled through its input-output equation based on the modulation index. Three types of controllers were modeled, simulated and experimentally tested. The results show that both suggested control methods improve the system performance. The slip speed has been decreased and the starting torque and maximum torque have been increased. Controller with constant maximum torque can be used in drive systems working with constant load, while controller with constant flux can be used in drive systems working with constant power.

Indonesian Journal of Electrical Engineering and Computer Science, 2022

Harmonic is seen to be an important factor that can influence the performance of different electrical appliances. Earlier studies have regarded the nonsinusoidal power supply as the major source of the harmonic in the induction motors. In this paper, the researcher compared the results generated by a single-phase capacitor induction motor (SIM) using the sinusoidal and nonsinusoidal power supplies. The results in the study could help in comprehensively understanding the impact of the harmonic on the effective performance of the SIM machines when they were powered using a nonsinusoidal power supply. Here, the performance of the SIM when subjected to a maximum load or non-load condition were studied and determined. Furthermore, numerous experimental work was presented to validate the results of the SIM. Power analyses and spectral analysis indicated the actual difference in the overall harmonic wave distortion. It was seen that the current load increased to 89% (i.e., an increase of 11%) when the motor working from the non-sinusoidal source. This investigation highlighted the direct impact of the non-sinusoidal power source on the properties and components of the SIM machine. The vibrations measured under varying conditions and compared the results for the 2 types of power supplies.

Due to the advancement in power semiconductor devices and microprocessors, PWM inverters have been used in today's motor drives. The most commonly used PWM techniques are Sinusoidal pulse width modulation (SPWM) and Space vector pulse width modulation (SVPWM). Sinusoidal PWM technique is complex in digital implementation. Space Vector Pulse Width Modulation (SVPWM) is a digital technique, which increases the output voltage capability and increases DC bus utilization voltage. The output of the inverter can contain large number of voltage harmonics. As aim is to get low THD with sinusoidal output voltage waveform it is proposed to use LC filter. Sinusoidal output waveform is fed to an Induction Motor (IM). An AC drive system performance was simulated and evaluated for variable speed operation from no-load to rated speed under constant torque operation. The performance of motors has been analyzed from no load and full load in this paper. The focus was based on the simulation of power circuits using MATLAB/SIMULINK software.

IET Electric Power Applications, 2008

This paper presents an analytical closed-form mathematical model and analysis of the influence of the DC-bus ripple voltage of the three-phase voltage source inverter (VSI) with the space-vector PWM (SVPWM) on the induction machine phase voltages, currents and torque pulsations. The analytical expressions for the voltage and current space-vectors as a function of the dc-bus voltage pulsation are derived. Using superposition we can determine the separate parts of the motor currents. Next, it is shown, that dc-link voltage ripple components may cause large torque pulsation. The proposed analytical method is based on the mixed p-z approach, enabling presentation of the results in lucid and closed-form. To verify the effectiveness of the proposed analytical model, experimental results based on laboratory setup were obtained.

This paper presents the analysis of the sinusoidal pulse width modulation (SPWM) and space-vector modulation (SVPWM). The analysis involves the relationship between modulation signals and space vectors and the switching patterns of spacevector modulation and the trigger of power electronic device .All the relationships provides a bidirectional bridge for the transformation between sinusoidal PWM modulators and space-vector modulation modulators. It is noted that all the drawn conclusions are independent of the load type. Nevertheless, the implementations of both SPWM and SVPWM circuits are carried out using three phase induction motor as a load.

IEEE Transactions on Industrial Electronics, 1994

Abstruct-Improved reliability and fault tolerant operation of converter systems are extremely important for industrial ac drives. The paper considers variable frequency variable voltage operation of a three-phase induction motor in single-phase mode for two common faults of a three-phase inverter, i.e., open base drive and device short-circuit. The motor performance has been extensively analyzed in single-phase mode and remedial strategies have been developed to neutralize large second and other lower order harmonic pulsating t0rques.h a single-phase open loop volts/Hz control mode of a faulty three-phase inverter, it has been demonstrated that odd harmonic voltages at appropriate phase angles can be injected to neutralize the low frequency pulsating torques so as to permit smooth drive operation. It has been shown that the pulsating torque can be further reduced by load dependent flux programming rather than operating with constant rated flux.