Pdf squirrel cage induction motor design and the effect of. The motor uses a squirrel cage rotor, which has a laminated iron core with slots. Closedform analysis of squirrelcage induction motors with. What are the advantages of a squirrelcage induction motor. Foot mounted b3 construction 3 phase squirrel cage induction motors suitable for v. Squirrel cage induction motors are very prevalent in industry, in sizes from below 1 kilowatt 1. The reason for the name squirrel cage is because of the type of rotor used in these motors. Pdf design and fabrication of high efficiency squirrel cage. Low and high voltage three phase induction motors m line squirrel cage rotor horizontal date. The starting current is very large, normally 6 to 8 times the rated current.
Method of manufacturing squirrel cage rotors sep 16, 1997. Squirrel cage induction motors are suitable for applications where the drive requires constant speed. However, for clarity reasons, the machine will be referred to as a motor. Threephase squirrel cage induction motors for centrifugal pumps for agricultural applications number of amendments. Therefore a new term is needed to describe the induction motor. Squirrel cage induction motors are widely used in industrial applications than slip ring induction motors due to cheaper in cost, rugged in construction, low maintenance.
Pdf improving squirrel cage induction motor efficiency. Nov 03, 2019 an induction motor also known as an asynchronous motor is a commonly used ac electric motor. Bharat bijlee make crane and hoist duty motors are ideally suitable for short time more details refer brake motors section of the catalogue. An induction motor s rotor can be either wound type or squirrelcage type. Aug 08, 2019 bharat bijlee make crane and hoist duty motors are ideally suitable for short time more details refer brake motors section of the catalogue. An important issue in such effort is the modelling of the induction motor including rotor slot harmonics rsh under symmetrical and asymmetrical conditions, with. Basically, it is the construction of rotor which makes squirrel cage induction motor different from wound type induction motor.
Stator with laminated iron core slots with winding bars ring to short. Pdf three phase squirrel cage induction motor, conctruction. In 1824, the french physicist francois arago formulated the existence of rotating magnetic fields. This is actually an extention to algers model, explained in electric motor handbook, h. Choose a web site to get translated content where available and see local events and offers.
Mostafa elshahed objectives learn a brief history of the electrical power systems construction. This course primarily focuses on building your basic knowle dge of nema threephase induction motors, which are part of. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Normally, we use the motors in industrial drives because they are rugged, reliable and economical. Vvi is a square wave inverter in which voltage and frequency vary in proportion constant volts per hertz. However, it suffers from the disadvantage of a low starting torque. They are the most common type of industrial ac electric motor, being rugged and requiring neither a separate dc power source nor sliprings. Lecture 6 three phase induction motors cairo university. Squirrel cage induction motors are suitable for applications where the drive requires constant speed, low starting torque and no speed control drives. Model repair specifications for low voltage induction motors. The squirrel cage induction motor was designed for an extended service life under very demanding conditions. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrel cage configuration. Almost 95% of the induction motors used is of squirrel cage type. Energy efficient induction motors three phase squirrel cage.
The induction motor is mod eled as six concentric cylindrical layers. Legally binding document step out from the old to the newjawaharlal nehru invent a new india using knowledge. They are particularly suited for applications where the motor must maintain a constant speed, be selfstarting, or there is a desire for low maintenance. Jul 25, 2019 application of squirrel cage induction motor. Pdf design of a threephase squirrelcage induction motor. Menzel squirrel cage induction motors are manufactured for various industries and industrial applications of all kinds. Advantages and disadvantages of squirrel cage induction motor. It has the stator of an induction motor, and the rotor of a dc motor.
Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as well as medium and high voltage up to 25000 kw 25 mw. Rotor for squirrel cage induction motor rankin kennedy, electrical installations, vol ii, 1909. These motors are tested to strict quality control for routine and type tests at every stage of production and are ideally suitable for various. Oct 09, 2016 in simple words, the type of 3 phase induction motor which uses a squirrel cage rotor is called squirrel cage induction motor. It directly connects the contacts of the motor to the full supply voltage. The squirrel cage induction motors are 90% used in various industrial, domestic and commercial applications. A squirrel cage i nduction motor sqim are the most common motors used i n industrial motion control systems, as well as in main powered home appliances because of its simple, rugged d esign, low. Squirrel cage induction motor characteristics squirrel cage induction motor characteristics, pdf file squirrel cage motors squirrel cage motors get their name from the appearance of early rotors. Squirrel cage induction motors menzel elektromotoren. When a 3 phase supply is given to the stator winding it sets up a rotating magnetic field in space. An 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. However, should the motor require service, this manual includes a section that assists the. In order to avoid excessive voltage drops in the supply. The construction of stator of the induction motor is almost the same as other motors.
This instruction manual applies to both motors and induction generators. The three phase squirrel cage induction motors are classified into 6 different standard types based on their electrical characteristics. It is low cost and requires low maintenance in comparison with other motor types. It converts electrical energy into mechanical energy and it is used to provide motion. Threephase squirrelcage induction motors are widely used as industrial drives because they are selfstarting, reliable and economical. A squirrelcage rotor is the rotating part of the common squirrelcage induction motor. Pdf speed control of squirrel cage induction motor sqim. Search wegthreephaseinductionmotorstlinesquirrelcage. An induction motor or asynchronous motor is an ac electric motor in which the electric current.
May 2017 generalpurpose formwound squirrel cage induction motors185 kw 250 hp through 2240 kw 3000 hp, second edition. Keeping the vf ratio constant, when frequency is reduced then that results in constant slipfrequency at running. Motors employing this type of rotor are variously known asphasewound motors or wound motors or as slipring motors. Three phase squirrel cage induction motors ie1 motors maa baa series ie2 motors maq baq series. Motors are available for use on variable frequency inverters. The rotor bars are not insulated from the rotor core because they are made of metals having less resistance than the core. In simple words, the type of 3 phase induction motor which uses a squirrel cage rotor is called squirrel cage induction motor. Some large induction motors use a wound rotor to increase the starting torque and give some speed control for the motor. Dec 10, 2015 watch this video and learn basics of squirrel cage induction motor. So s1f1s2f2, and at starting the slip is equal to 1, so a unique value of. Improving squirrel cage induction motor efficiency. Physical and eventbased modeling physical modeling simscape electrical specialized power systems.
Instead of using a squirrelcage rotor, the rotor is wound with windings that are the same the stator windings. Electric motors and machines, squirrel cage ac induction motor. Designing of three phase squirrel cage induction motor for. The effect of stator slots and teeth is included by a second anisotropic homogeneous medium. But the rotor construction differs with respect to the type of motor. An induction motor can therefore be made without electrical connections to the rotor. A simple explanation of squirrel cage induction motors.
For higher ratings refer to high efficiency large motors with dcca. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. Pwi is a pulse width modulated inverter and the same as the vvi. Particularly, the squirrel cage type is simplicity, robustness and low cost, which has always made it very goodlooking and therefore, captured the leading place in industrial sector. Instead of using a squirrel cage rotor, the rotor is wound with windings that are the same the stator windings. Langheim, conference record, ieee industry applications society annual meeting, 1989, pp 38 44. Watch this video and learn basics of squirrel cage induction motor. Abstract squirrel cage induction motors are mainly employed in almost all applications. They are simple, rugged, and selfstarting, and maintain a reasonably constant speed from light load to full load, set by the frequency of the power supply and the number of poles of the. These motors are suitable for all general applications where an open machine is not applicable due to severe environments such as excessive dirt, dust andor moisture.
They always operate at low power factor which ultimately results in less efficiency. This product is unavailable in cuba, iran, north korea, syria document history. How are high starting torques obtained in a squirrel cage. The rotor of an induction motor can be a squirrel cage rotor or wound. Induction motors installation operation generators. For motors falling outside this description, the more comprehensive model specifications below are recommended.
Amethod of making a squirrel cage rotor of copper material. Differentiate between the various types of generating electric power stations. Menzel squirrel cage motors are available in all standard motor cooling and protection types for lowvoltage from 75 kw as well as medium. Squirrel cage induction machines can be driven by various types of prime movers. Squirrelcage motor definition of squirrelcage motor by. Specifications and standards ie1 maa baa series technical characteristics technical data dimensions ie2 maq baq series technical characteristics technical data dimensions contacts 03 07 07 08 12 15 15 16 18 20. Teco totally enclosed fan cooled squirrel cage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and other international standards. Horizontal squirrel cage mediumvoltage induction motor. Single phase induction motor this singlephase motors are truly twophase machines. Squirrel cage induction motor the engineering projects. Kalsi group product categories squirrel cage induction motors. Pdf tthis paper describes the primary results of a research project whose aim is the efficiency improvement in industrial threephase induction. Describe the construction of a squirrel cage ac motor describe the operation of a rotating magnetic field. At hordu 19 years induction motor manufacturer, we have a range of three phase induction motors that vary in design, technology and production capacity.
Working principle of 3 phase squirrel cage induction motor. List and describe the more commonly used equipment in an electric substation. Motors employing this type of rotor are known as squirrel cage inductionmotors. Based on your location, we recommend that you select.
The conversion process is electromagnetic induction. Slip ring induction motor is made up from wound rotor and squirrel cage induction motor is made up from the squirrel cage rotor. Most of single phase induction motors use squirrel cage rotor as it has a remarkably simple and robust construction enabling it to operate in the most adverse circumstances. As you can see, the 3 phase squirrel cage induction motor could achieve the electromechanical energy conversion simple and straight forward. A motor rating of 10 horse power, 415 volts with 1440 rpm and 4pole is selected for design problem and an equivalent circuit model is developed to find out the various performance parameters like efficiency, starting torque, torque.
Different methods are employed to raise the power factor of the induction motors for maximizing efficiency. December 2014 formwound squirrelcage induction motors500 horsepower and larger, fifth edition. When voltage is applied to the stator winding, a rotating magnetic field is established. Aluminum bars are molded on the slots and shortcircuited at both ends with a ring. Teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and other international standards.
So called because rotor tries to line up with the rotating magnetic field in the stator. Squirrel cage induction motors are very widely used in both fixedspeed and. Generally speaking, there are three different types of inverters. Squirrel cage construction, the rotor winding consists of a number of rotor bars, shortcut by rings from both side, see figure below. The squirrel cage induction motor is the most commonly used motor in industry. It consists of a cylinder of steel laminations, with aluminum or copper. Energy efficient induction motors internet archive. How are squirrel cage induction motors constructed.
Now let us discuss in detail, the most common form of induction motor, the squirrel cage induction motor. The threephase induction motor the squirrelcage induction motor the woundrotor induction motor 3 4. And in the previous article on types of electrical motors, we have classified induction motors based on the type of rotor used. Mainly we discuss a threephase squirrel cage induction motor. The rotor is constructed using a number of single bars shortcircuited by end rings and arranged in a hamsterwheel or squirrelcage configuration. Construction of squirrel cage induction motor explained. Learn the working principle and applications of a squirrel cage induction. This rotating magnetic field has a speed which is known as the synchronous speed this rotating magnetic field induces the voltage in rotor bars and hence shortcircuit currents start flowing in the rotor bars. Using variable voltage variable frequency vvvf drive. Designing squirrel cage rotor slots with high conductivity. Squirrel cage induction motors are commonly used in many industrial applications. Model repair specifications for low voltage induction motors these model repair specifications are intended to cover routine repair and rewind of lowvoltage randomwound threephase ac squirrel cage induction motors. Singlephase induction motors are used extensively for smaller loads, such as household appliances like fans. Squirrel cage rotor almost 90 per cent of induction motors are squirrel cage type.
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