A three-phase induction motor has two parts. They are self-starting. The induction motor will run at a slight less speed due to "slip" which is what gives the motor its torque. Bearing Fault: In three phase induction motor two sets of bearings are installed inside of motor housing, for the supporting the motor shaft.The main purposes of these bearings are, to rotate the motor shaft freely and reduce the fiction. In the case of a three-phase induction motor, the stator holds symmetrically distributed three-phase winding in its slots. An induction motor can therefore be made without electrical connections to the rotor. Stator frame can be constructed using cast iron, aluminum, or rolled steel. Three phase induction motors are further divided into two types; Squirrel Cage Induction Motor and Wound Rotor Induction Motor based on the construction of rotor. Three phase induction motor or asynchronous motor, with output 3 hp/2.2kW, working voltage 380V 50Hz, rated speed 6P 940rpm, nominal torque 22.35Nm. 3 phase induction motors are of two types, squirrel cage and slip ring motors. Three-phase induction motors are widely used in industrial and commercial drives because they are rugged, reliable and economical. The speed of an induction motor is a function of speed or no rotations of the field, in other words, the frequency and the number of magnetic poles created on the stator . Squirrel cage motors are widely used on ships due to their rugged construction and simple design, few e.g. 3-phase AC induction motors are comprised of the stator and rotor. Example fans,blowers, cranes,traction .It is a ac motor. The torque-speed characteristic of an induction motor can be significantly changed by designing For industrial and mining applications, 3-phase AC induction motors are the prime movers for the vast majority of machines. 3 Phase Induction Motor Construction. Polyphase induction motor MCQ With Explanation | In case of 3 phase induction motors the ratio of core length to pole pitch for minimum cost is taken as PRINCIPLE OF WORKING In a three-phase induction motor, the stator is wound with a three-phase winding for P number of poles. An induction motor which connects with a 3-phase supply called 3-phase induction motor. Approximately twice the earlier current. 3 Phase Induction Motor: These 3 phase motor is supplied with 3 three-phase AC supply and is widely used in ships for heavier loads. 3 Phase Induction motor control using variable frequency drive(VFD) Variable Frequency drive or VFD is the most popular and has found widespread use in industrial and domestic applications because of its ease of implementation. • The electric energy generated purchased by consumers for different needs. This energy is converted to different forms: –Lighting (indoor/outdoor – CFL, incandescent, This implies that by suitably varying the clock frequency of IC 4035, we can effectively change the operating 3-phase frequency of the induction motor. In the motor nameplate, the company provides the motor is 15 KW 3 phase induction motor. An induction motor can be, Squirrel cage induction motor; Slip ring induction motor; The induction motor is started by itself that we know. Enter the rated volts, amps, power, and efficiency to find the current flowing through the motor. As the current passes through the coils on opposite sides of the stator, a two-pole electromagnet is established, creating a two-pole motor. The stator is a tubular iron frame that consists of a laminated and slotted stator core. One single-phase wattmeter plus miscellaneous apparatus as needed . Now, let us see how we can achieve speed variation in this motor. Three Phase Induction Motors MCQs with Explanatory Answers 1. They have very simple and rugged (almost unbreakable) construction; they are very reliable and having low cost; they have high efficiency and good power factor If the frequency of 3-phase supply to the stator of 3-phase induction motor is increased, then The rotational speed of the shaft and the applied torque is dependent on the operating frequency and the number of pole pairs in the motor’s windings. The motor draws more current from remaining two supply lines. The poles for which the winding is made could be 2, 4, 6, 8, … etc. Figure 3 Rotor Mass Unbalance Fault. The volts of the motor … Due to single phasing the induction motor performance severely effected. One dynamometer with torque controller . The following are the effects of single phasing. Production of a rotating magnetic field. Induction motors are generally two types as we see in the previous article. 1. Since this motor has very wide applications and speed control of 3 phase induction motor can give an added advantage. 3-Phase Induction Motors EE 340 . The speed of a three phase induction motor is given by, N = N s (1-s) and N s = 120f/P This shows the speed of three phase induction motor depends upon synchronous speed (N s) and slip(s).The synchronous speed of induction motor depends upon supply frequency and the number of stator poles. Difference Between Single Phase and Three Phase Induction Motor The Single Phase and Three Phase Induction Motor is differentiated on the various factors in this article such as the Supply on which they operate, their starting torque, maintenance, features, the efficiency of the motor, their power factors and the example where the two motors are used. The torque and speed characteristic is seriously affected when a 3-phase motor operates on a single phase. In both cases,… Where does the power go? Basic Construction of 3 Phase Induction Motor. The stator frame provides necessary mechanical protection and support for stator laminated core, windings, and other arrangements for ventilation. First of all, I am going to discuss about the construction of 3 Phase Induction Motor and then I will throw some light on its working. The Eff of the motor is 0.89 and PF is 0.85. Three-Phase Induction Motor Revised: April 11, 2013 6 of 10 The impedances of the circuits shown in Figure 5 are found from no-load and blocked-rotor tests. The stator of an induction motor consists of a number of overlapping windings offset by an electrical angle of 120°. Cheap 3 phase induction motor features optimum structure, high reliability, low noise, easy to install and simple to operate. Small 3 - phase induction motors cost less than half the equivalent d.c. machines, and sizes from 3 to 50 h.p., including the slip-ring type, average about two-thirds the cost of the d.c. machine of similar output. Stator. Full descriptions of the circuits and the tests are found in Reference 1. These two parts are stator and rotor. For example 5.5kW, 400v, 2 pole motor will run at approximately 2880 rpm. When a three phase induction motor - connected to a single phase power supply using the Steinmetz connection - operates in a practical no-load condition, not all windings consume active power. The 3 phase signals are applied across the 4049 IC gates for producing the required HIN, LIN feeds for the full -bridge driver network. Single Phase induction Motor Three Phase Induction Motor; Power Source: Single Phase (1-phase) Only: Generally requires more than a single phase power source (like 3-phase supply). Thus, at normal supply voltage, like in transformers, the initial current taken by the primary is very large for a short while. A three phase induction motor runs on a three phase AC supply.3 phase induction motors are extensively used for various industrial applications because of their following advantages - . For a four pole machine, 60 x 50 / 2 = 1500 rpm so the same size motor at 5.5kW, 400v but 4 poles will have a nominal speed of 1500rpm but will run near 1455 rpm. When the 3 phase supply is provided to the stator, a magnetic field is produced which rotates the rotor and motor starts. 3-phase AC induction motors. During operation, a current is applied through the stator, which induces a magnetic field and leads to the rotation of the rotor. Initial Data . 3 Phase Motor Current Calculation Formula Explained In the below image I have shown a 3 phase motor nameplate. One Phase Sequence Indicator . An induction motor, 3 phase induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. High starting torque: The staring torque of induction motor is very high which makes motor useful for operations where load is applied before the starting of the motor.3 phase induction motors will have self starting torque unlike synchronous motors. An induction motor is similar to a poly-phase transformer whose secondary is short circuited. They can be used in control of motors used in conveyors and other machinery. 2. Single-phase induction motors are used extensively for smaller loads, such as household appliances like the vacuum cleaner, fans, washing machine, centrifugal pump, blowers, washing machine, small toys, etc. In a 3-phase AC induction motor, there are three stator windings, each usually in two halves, with the rotor winding short-circuited by end rings. One 208 Volt, 0.75 HP, 3-phase induction motor . Manufacturer of Induction Motor - Three Phase Induction Motor, AC Induction Motor, Crompton Induction Motor offered by Nexa Engineering Solutions, Pune, Maharashtra. A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections.. Efficiency : Low as only one winding has to carry all the current 3 Phase Induction Motor current calculator is used to calculate the rated and full load amperes of the motor. MS100L1-4 3 Phase Induction Motor Squirrel Cage 3HP 2.2KW 400V 60HZ IE1 Efficiency Aluminium Housing 3 Phase Induction Motor 0.75KW 1HP Capacitor Running For Gear Box Copper Wire MS802-2 0.75kw 400V Three Phase Induction Motor Starting Mechanism: They are NOT self-starting. 2. A double squirrel-cage induction motor has two rotors moving in opposite direction two parallel windings in the stator two parallel windings in the rotor two series windings in the stator 2. The starting torque of a squirrel-cage induction motor is low negligible same as the full-load torque slightly more than full-load torque 3. The rotor which is placed inside the stator is either squirrel-cage type or slip-ring type. Record all nameplate information for the induction motor. 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