Advantages And Disadvantages Of Speed Control Of Induction Motor

where ia is the armature current. The voltage across the inductor is proportional to the change of current through the coil with respect to time and can be written as

Starting Current of both motors were different, when analyzed using ETAP. Starting current of Induction motor was more than that of the synchronous motor. However Induction motor is used for Stable operation in running condition [1]

Figure 1: An example of PWM in AC motor drive. The smoothness of the resultant sinusoidal waveform can be controlled by the width and number of modulated impulses.

Using Field Oriented Control, current control is largely unaffected by speed of rotation of the motor[6].In the scheme of filed oriented control motor currents and voltages obtained from the motor are transformed into d-q reference frame. Measured currents from three stator phases these currents which are now in the stator reference frame are converted into two phase using Clarke transformations which are further converted into the corresponding rotor reference frame using Park transformation. The resultant current obtained is dc which is easier for the PI controllers to operate.

As car manufacturers continue to innovate at a rapid rate, many attempts to produce practical electric cars have occurred and continue to occur.

Because of its linear characteristics and ease of controlling it's speed by simple power electronic circuit. The main obstacle for this type of system which has prompted the researchers to focus their studies toward AC machine, such as induction and synchronous machine. The availability of the variable speed drives for induction motor made it dominated in industry. Despite this, the small efficiency in induction motor especially those which have low power rating. The PMBDCM with predominant performance is found to be the solution for the drawbacks of the AC and Induction motors. The characteristics of the PMBDCM is similar to the separately excited DC motor, the difference in controller of PMBDCM which is the same of AC motor controller [2] [6].

Simulation of the proposed converter & the results using MATLAB & Simulink can be seen in this

the most straightforward gadget that can be connected to CNC machines since it can change over advanced information into real mechanical relocation. It is not important to have any simple to-computerized converter nor criticism gadget for the control framework. They are in a perfect world suited to open circle frameworks. In any case, Stepping engines are not generally utilized as a part of machine devices because of the accompanying disadvantages moderate rate, low torque, low determination and simple to slip if there should be an occurrence of over-burden. Samples of venturing engine application are the attractive head of floppy-plate drive and hard circle drive of PC, daisy-wheel sort printer, X-Y tape control, and CNC EDM Wire-cut machine

D.C Motor is used for variable speed operation because in dc motor torque and flux that can be control independently and that is achieved by armature and field current control respectively. D.C motor has many advantages delivering high starting torque, ease of control and non linear performance. But due to certain disadvantage of dc machine such as mechanical commutator and brush holder required time to time maintenance [1] .So cost of the drive system is increases. But now D.C Motor is less used in industrial applications. Because of low cost, better performance and the requirement of maintenance is less as compared to D.C Motor it make the asynchronous motor advantageous in many industrial applications. SCIM are most widely used than all the rest of the electric motor as they have all the advantages of A.C Motors and are cheaper in cost as compared to slip ring induction motor. Because of absence of slip rings, brush maintenance duration and cost associated with the wear and tear of brush are minimized. Because of these advantages, the induction motor is used in element of most of the electrical drive system for all the conditions like starting, braking, change in speed and speed reversal. To achieve the maximum efficiency of the induction motor drive, so many techniques are developed in the last few years. Now a day’s high switching frequency converters are used for changing the frequency, phase and amplitude of the input to an A.C. Motor can be changed, hence the speed and motor torque can be controlled. With the help of power electronic it is possible to

Now a days, the switching power supply market is flourishing quickly. The trend is for DC-AC converters with low cost, higher efficiency, power saving that enable maximum features. In this project, a single-stage three-switch buck-boost inverter is designed, where stepping up, stepping down and inversion operation will takes place in single stage. This proposed inverter will overcome all the drawbacks of traditional one. Coupled inductor plays a very important role in energy transfer and eliminates the use of line frequency transformer. As the inverter having only three switches, the controlling of switches also easier than conventional one. And it has also advantages like compact design, reduced switching losses, component size, and cost.

In this chapter, an overview of the state of the art system of an induction motor is carried out. It looks at various induction motor control methodologies utilizing current and voltage control to control the flux and the torque of the dynamic system. Highlight of the current and future challenges of induction motor drives are presented. To do that, a general principle of induction motor drives is discussed first follow by phase controlled of induction motor drives, frequency controlled of induction motor, and vector controlled of induction motor.

A notable application of Nikola Tesla’s Alternating Current induction motor is the Electric Vehicle (EV). EVs are powered by an electric motor rather than a conventional gasoline engine. It is important to make the distinction between an EV and a hybrid, plug-in hybrid, or hydrogen fuel cell car. For our analysis, an EV is a vehicle that is completely driven by an electric motor, which is powered by a large battery, such as the BMW i3 and the Tesla Model S.

Hence, the proposed variable switching frequency PWM reduces the switching instances within a fundamental cycle by lowering the effective switching frequency, while maintaining the output current ripple within a pre-defined range.

Validate the proposed control strategies over a wide operating range of the drive, for steady state and transient operation.

Based on the modelling of SRM magnetic circuit, three models of SRM are found in literature: linear model, nonlinear model without mutual inductances, and nonlinear model with mutual inductances. Linear models in [6,7] are designed and simulated readily. On contrast nonlinear models are obtained after a large set of experimental tests to obtain the magnetic characteristics [8-15], or from a finite element method (FEM) analysis [16-18], which takes into consideration the saturation of rotor and stator materials. The nonlinear model is preferable when accurate precision is wanted. The converter used with SRM requires at least one switch per phase due to unidirectional phase current. This is a big advantage when compared to the converters for AC motor drives. Some configurations of converters used in SRM drives are presented in [19-22]. The half-bridge asymmetric converter is the most widely used for SRM drive applications, because of its high