Introduction to Induction Machine | Use of Induction Motor: The Introduction to Induction Machine is an important class of electric machines which finds wide applicability as a motor in industry and in its single-phase form in several domestic applications. More than … (Read More)

Construction of Induction Motor and Types of Rotor in Induction Motor: The stator of an Construction of Induction Motor is similar to that of a synchronous machine and is wound for three phases, modem practice being to use the two-layer winding. … (Read More)

Principle of Operation of Induction Motor: The Principle of Operation of Induction Motor in Figure 9.4 shows the cross-sectional view of an induction motor. The stator is fed from a 3-phase supply of voltage V/phase and frequency f Hz. The rotor … (Read More)

Induction Motor Equivalent Circuit: The behavior of the induction machine was studied in terms of the basic field phenomenon. The attempt here was purposely focused on the transformer analogy of induction motor. Certain facts established so … (Read More)

Approximate Circuit Model of an Induction Motor: An Approximate Circuit Model of an induction motor, which results in considerable computational ease in analysis, is obtained by shifting the shunt branch in Fig. 9.8(a) to the input terminals as shown in Fig. … (Read More)

Air Gap Power in Induction Motor | Torque and Power Output Equation: Air Gap Power in Induction Motor – The circuit model is shown in Fig. 9.10. The power crossing the terminals ab in this circuit is the electrical power input … (Read More)

Torque Slip Characteristics of Induction Motor: The expression for Torque Slip Characteristics of Induction Motor (T(s)) is easily obtained by finding the Thevenin equivalent of the circuit to the left of ab in Fig. 9.12. The circuit then reduces to Fig. 9.13 … (Read More)

Starting Methods of Induction Motor: At the time of starting the motor slip being unity, the load resistance with reference to the approximate circuit model of Fig. 9.23 is meaning thereby that short-circuit conditions prevail. Therefore, … (Read More)

Crawling and Cogging in Induction Motor: A squirrel-cage rotor may exhibit a peculiar behavior in starting for certain relationships between the number of poles and the stator and rotor slots. With the number of … (Read More)

Speed Control of Induction Motor: Stepless control of speed of induction motors cannot be carried out as efficiently and inexpensively as for dc motors. Various methods of Speed Control of Induction Motor can be visualized by consideration of the speed equation It … (Read More)

Deep Bar Rotor Induction Motor: In this type of Deep Bar Rotor Induction Motor construction, bars of narrow width are laid down in deep semi-enclosed  slots as shown in Fig. 9.52. The magnetic leakage flux pattern set up by the bar current … (Read More)

Double Cage Rotor Induction Motor: A rotor design, which though more expensive gives still better starting, and running performances than the deep-bar design, is the Double Cage Rotor Induction Motor. The double squirrel cage induction motor winding in this design consists … (Read More)

Standard Types of Squirrel Cage Motors: To cater to the different starting and running requirements of a various industrial applications, several Standard Types of Squirrel Cage Motors are available in the market. The torque-speed characteristics of the most common designs are … (Read More)

Induction Generator Transmission Line Diagram: An induction generator is asynchronous in nature because of which it is commonly used as windmill generator as a windmill runs at non-fixed speed. These are used in remote areas to supplement power received from weak … (Read More)

Isolated Induction Generator: An Induction Machine can also work as a generator even if external power supply not available and it is called Isolated Induction Generator. An Isolated Induction Generator feeding a load is shown in Fig. 9.61. The delta-connected capacitors … (Read More)

Dynamic Modelling of Induction Motor: In general, the mechanical time-constant for any machine is much larger than the electrical time constant. Therefore, the Dynamic Modelling of Induction Motor can be simplified by neglecting the electrical transient without any loss of accuracy … (Read More)

Inverted Induction Motor: In a wound rotor induction machine the three-phase supply can be given to the rotor windings through the slip rings and the stator terminals can be shorted (see Fig. 9.68). Such a Rotor Fed Induction Machine is also … (Read More)

Development of a High Efficiency Induction Motor: With ever-increasing energy cost the life-time operating cost of an induction motor can be traded against a high efficiency and high capital cost induction motors. With rising demand for high efficiency or energy efficient … (Read More)

No Load Test of Induction Motor: In this No Load Test of Induction Motor, the motor is run on no-load at rated voltage and frequency. The applied voltage and current and power input to motor are measured by the metering as … (Read More)

Blocked Rotor Test of Induction Motor: This Blocked Rotor Test of Induction Motor is used to determine the series parameters of the Circuit Model Parameters of an induction motor. The circuit is similar to that of a transformer short-circuit test. Short … (Read More)