Motor Types And Uses Pdf

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Which is attached to the field with a field coil armature in DC motors, it is called a series motor. Its field coil is made of a low-angle thick wire. Such motors are very high work in the starting.

Different types of motors and their use

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Ratings and uses of three types of motor: Induction motor, Synchronous motor, DC motor. Mahmudul Islam.

Download PDF. A short summary of this paper. A motor is nothing but an electro-mechanical device that converts electrical energy to mechanical energy. In simple words we can say a device that produces rotational force is a motor. The very basic principal of functioning of an electrical motor lies on the fact that force is experienced in the direction perpendicular to magnetic field and the current, when field and current are made to interact with each other.

An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this is the conversion of mechanical energy into electrical energy and is done by an electric generator, which has much in common with a motor.

Found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives, electric motors can be powered by direct current DC sources, such as from batteries, motor vehicles or rectifiers, or by alternating current AC sources, such as from the power grid, inverters or generators.

Small motors may be found in electric watches. General-purpose motors with highly standardized dimensions and characteristics provide convenient mechanical power for industrial use.

The largest of electric motors are used for ship propulsion, pipeline compression and pumped-storage applications with ratings reaching megawatts. Electric motors may be classified by electric power source type, internal construction, application, type of motion output, and so on.

Types of motors Synchronous Motor A synchronous electric motor is an AC motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles.

Synchronous motors contain multiphase AC electromagnets on the stator of the motor that create a magnetic field which rotates in time with the oscillations of the line current. The rotor with permanent magnets or electromagnets turns in step with the stator field at the same rate and as a result, provides the second synchronized rotating magnet field of any AC motor.

A synchronous motor is only considered doubly fed if it is supplied with independently excited multiphase AC electromagnets on both the rotor and stator.

For this purpose they are run without mechanical load on them and in over-excited condition. These machines when over excited delivers the reactive power to grid and helps to improve the power factor of the system.

The reactive power delivered by the synchronous motors can be adjusted by varying the field excitation of the motor. These motors used for power factor correction applications can also be termed as "synchronous condensers". Advantage of synchronous condensers compared to shunt capacitors is that shunt capacitors generate constant reactive power whereas on the other hand synchronous condensers can able to deliver different reactive power levels by varying the excitation of machine.

Ratings of Synchronous motor Power rating of an alternator is defined as the power which can be delivered by an alternator safely and efficiently under some specific conditions. Increasing load, increases losses in alternator, which leads to temperature rise of the machine. The conductor and insulator parts of the machine have some specific over heating withstand limits.

The power rating of an alternator is so specified, that at that maximum load, the temperature rise of different parts of the machine does not cross their specified safe limit. The copper losses i. I2R loss varies with armature current and core losses vary with voltage. The temperature rise or heating of alternator depends upon cumulative effect of copper losses and core losses.

In other words, as the losses of alternator are independent of electrical power factor, hence power factor does not come into picture while power rating of an alternator is calculated or estimated. Although losses of alternator depends upon its KVA or MVA rating but actual output varies with electrical power factor.

The electrical output of an alternator is product of power factor and VA and output is expressed in KW. Sometimes alternators are also rated by its power instead of VA rating. That time electrical power factor of the alternator must be specified too. In addition to KVA rating, an alternator is also rated with voltage, electric current, frequency, speed, number of phase, number of poles, field ampere, excitation voltage, maximum temperature rise limit etc.

Single Phase Induction Motor Single phase induction motor is an AC motor were electrical energy is converted to mechanical energy to perform some physical task. This induction motor requires only one power phase for their proper operation.

They are commonly used in low power applications, in domestic and industrial use. Simple construction, cheap cost, better reliability, eases to repair and better maintenance are some of its markable advantages. The main components of the Single Phase induction motor are stator and rotor. Stator is known to be the stationary part. Usually, the single phase alternating supply is given to the stator winding.

Rotor is the rotating part of the motor. Rotor is connected to the mechanical load with the help of a shaft. Single Phase Induction Motors Applications These are used in low power applications and widely used in domestic applications as well as industrial. In three phase induction motor the power is transferred from stator to rotor winding through induction. The induction motor is also called a synchronous motor as it runs at a speed other than the synchronous speed. Ratings of Induction Motor: 1.

Voltage- typically given in rms value in volts- this is rated voltage you need to feed to motor for getting the best output. Current- usually given in amps this is the current drawn by the motor when it is running. Speed- usually given in rpm- this is the speed with which the shaft rotates if operator gives the rated voltage and frequency. Number of poles - 2,4,6,8 totally depends on your size of machine and its use.

Phases - 1 phase or 3 phase Induction motor. Power factor- usually 0. Miscellaneous details like make company name , model number, manufacturing date, frame size, class of insulation used, value of capacitor used, operating time, efficiency etc. However, controller costs have been trending downward in recent years such that application of brushless dc motors is on the rise and expected to grow.

While they have been successfully applied in the automotive, HVAC, electronic, computer, semiconductor and medical industries, BLDC motors have long been used in industrial applications such as actuators, feed drives for CNC machines, industrial robots, extruder drives, among others. Applications of BLDC Motors Brushless DC motors BLDC are used for a wide variety of application requirements such as varying loads, constant loads and positioning applications in the fields of industrial control, automotive, aviation, automation systems, health care equipment, etc.

Transmission systems are known to introduce less responsiveness and reduced accuracy. Direct-drive linear motors do not exhibit these shortcomings. BLDC linear servomotors consist of a slotted stator with magnetic teeth and a moving actuator, which has permanent magnets and coil windings.

To obtain linear motion, the motor controller excites the coil windings in the actuator causing an interaction of the magnetic fields thereby producing linear motion. As direct-drive linear motors, BLDC motors have the added advantages of maintenance-free operation with no mechanical connections, hysteresis or pitch cyclical error. Servomotors Servomotors are used for mechanical displacement, positioning or precision motion control based upon an input control and output feedback signal that establishes a tightly controlled, stable, closed loop operation.

Servomotor drives are commonly used in machine tool servos, robotic actuator drives, among others. What sets servomotor applications apart from other types of motor control is their inherent high dynamic response, smooth torque production, high reliability and robust control even when there are wide variations in load inertia or motor parameters.

In the past DC stepper motors were used as servomotors; however, since they are operate with open loop control, they typically exhibit torque pulsations. Brushless DC motors are more suitable as servomotors due to the feedback capability of the motor. Actuators for industrial robots Permanent magnet DC motors primarily function as the actuators to move the joints of industrial robots for pick-and-place or tool positioning in assembly, welding and painting operations. It merits noting that when heavy payloads are involved, hydraulic motors are typically used.

BLDC motors are preferred over brushed motors in robotic applications due to their compact size, power density, and maintenance-free characteristics. They also perform more reliably in less favorable or hazardous environments. DC drives are the most popular extruder drive due to their low cost and versatility. Since variations in screw speed can change the dimensions of the final extruded product, a precision motion control system is required to ensure product quality.

Brushless DC servomotors are used for their good heat dissipation, reduced rotor inertia and the advantage of maintenance free operation. The series DC motors are used where high starting torque is required, and variations in speed are possible.

Series motors are not suitable when a constant speed is needed. The reason is that the velocity of series motors varies greatly with varying load. For example — the series motors are used in Traction system, Cranes, air compressors, Vacuum Cleaner, Sewing machine, etc. This type of motor has good speed regulation even as the load varies, but does not have the starting torque of a series DC motor. It is a constant speed motor.

Where the speed is required to remain almost constant from no-load to full load and where the load has to be driven at a number of speeds and any one of which is nearly constant shunt motors are used. This motor is used when both a high starting torque and good speed regulation is needed. The motor can be connected in two arrangements: cumulatively or differentially.

Cumulative compound motors connect the series field to aid the shunt field, which provides higher starting torque but less speed regulation. Differential compound DC motors have good speed regulation and are typically operated at constant speed. In a PMDC motor, permanent magnets located in stator provide magnetic field, instead of stator winding.

The stator is usually made from steel in cylindrical form. Permanent magnets are usually made from rare earth materials or neodymium. They are developed up to about kW for use in various industries. The following applications are given below. Ratings of DC Motor The nameplate ratings of a DC motor refer to the conditions of voltage, current, speed, and power at which the motor is normally operated.

Different Types of Electric Motors

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When the field coil is energized, it creates a magnetic field excitation flux in the air gap, in the direction of the radii of the armature. Disadvantages are high maintenance and low life-span for high intensity uses. According to the most common industry naming conventions of today, there are three dc motor subtypes: Dc brush motors, dc permanent-magnet PM motors, and dc universal motors. DC motors normally have just two leads, one positive and one negative. Field system. Applications of the motor, usage of brushes and the maintenance cost of the motor. Advantages of a brushed DC motor include low initial cost, high reliability, and simple control of motor speed.

Ratings and uses of three types of motor: Induction motor, Synchronous motor, DC motor

Even though annealed at the mill, fully processed material may require further stress relief anneal after stamping. The stresses introduced during punching degrade the material properties around the edges of the lamination, and must be removed to obtain maximum performance. Because of its lower electrical conductivity, aluminum wire requires a 1. Insulation Modern magnet wire typically uses one to four layers of polymer film insulation, often of two different compositions, to provide a tough, continuous insulating layer.

A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy.

Types of DC Motors, Forms, and Uses

Motor Rewinding Pdf. Further details on the service requirements […]. This means that we can control the stepper motor with just 2 pins from our controller, or one for controlling the rotation direction and the other for controlling the steps. The 3 phase motor is a rugged piece of equipment but as with everything man made, there comes a time when this beautiful piece of machinery fails either due to old age, misapplication, mal-operation or. Hi, I need to rewind a single-phase 2 HP brooks motor but someone has massed the winding. The innovative design is packed with features to help you work safer, smarter and faster.

AC motors are highly flexible in many features including speed control VSD - Variable Speed Drives and have a much larger installed base compared to DC motors, some of the key advantages are:. The current trend for VSD is to add more features and programmable logic control PLC functionality, which add advantages but require greater technical expertise during maintenance. In this type of motor, the rotation of the rotor is synchronized with the frequency of the supply current and the speed remains constant under varying loads, so is ideal for driving equipment at a constant speed and are used in high precision positioning devices like robots, instrumentation, machines and process control. Click here for an example Synchronous Motor from RS. This type of motor uses electromagnetic induction from the magnetic field of the stator winding to produce an electric current in the rotor and hence Torque. These are the most common type of AC motor and are important to industry due to their load capacity, with Single-Phase induction motors being used mainly for smaller loads, for example in household appliances whereas, Three-Phase induction motors are used more in industrial applications including compressors, pumps, conveyor systems and lifting gear.

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. Electric motors can be powered by direct current DC sources, such as from batteries, or rectifiers , or by alternating current AC sources, such as a power grid, inverters or electrical generators. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy. Electric motors may be classified by considerations such as power source type, internal construction, application and type of motion output. In addition to AC versus DC types, motors may be brushed or brushless , may be of various phase see single-phase , two-phase , or three-phase , and may be either air-cooled or liquid-cooled. General-purpose motors with standard dimensions and characteristics provide convenient mechanical power for industrial use.


Applications requiring the motor to operate with a specified torque regardless of speed (hand tools, electric power steering, traction, vehicles, etc.) employ torque​.


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As we know, an electric motor plays a vital role in every sector of the industry, and also in a wide range of applications. There are a variety of types of electric motors are available in the market. The selection of these motors can be done based on the operation and voltage and applications. The main function of field winding is to produce the fixed magnetic field, whereas the armature winding looks like a conductor which is arranged within the magnetic field. Because of the magnetic field, the armature winding uses energy to generate an adequate torque to make the motor shaft turn. Currently, the classification of the DC motor can be done based on the winding connections, which means how the two coils in the motor are connected with each other. DC shunt motor works on DC and the windings of this electric motor like the armature windings and field windings are linked in parallel which is known as a shunt.

Premium Membership. Almost all modern industrial and commercial undertakings employ electric drive in preference to mechanical drive because it possesses the following advantages :. However, the above two disadvantages can be overcome by installing diesel-driven DC generators and turbine-driven 3-phase alternators which can be used either in the absence of or on the failure of normal electric supply. Since it has high starting torque and variable speed , it is used for heavy duty applications such as electric locomotives, steel rolling mills, hoists, lifts and cranes. It has high starting torque, large overload capacity and a nearly constant speed. It has high starting torque and large overload capacity.

 Прошу прощения? - проговорил директор. - Халохот был профессионалом высокого уровня, сэр. Мы были свидетелями убийства, поскольку находились всего в пятидесяти метрах от места. Все данные говорят, что Танкадо ни о чем таком даже не подозревал. - Данные? - спросил Бринкерхофф.

 Не несет ответственности? - Глаза Стратмора расширились от изумления.

Он не мог понять, почему Мидж всегда права. Он не заметил отражения, мелькнувшего за оконным стеклом рядом с. Крупная фигура возникла в дверях директорского кабинета. - Иису… - Слова застряли у Бринкерхоффа в глотке.

Долгая пауза. - Сэр… я не нахожу Клауса Шмидта в книге заказов, но, быть может, ваш брат хотел сохранить инкогнито, - наверное, дома его ждет жена? - Он непристойно захохотал. - Да, Клаус женат. Но он очень толстый.

Иногда она видела в нем что-то от Дэвида. У них было много общего: настойчивость, увлеченность своим делом, ум. Иногда ей казалось, что Стратмор без нее пропадет; ее любовь к криптографии помогала коммандеру отвлечься от завихрений политики, напоминая о молодости, отданной взламыванию шифров. Но и она тоже многим была обязана Стратмору: он стал ее защитником в мире рвущихся к власти мужчин, помогал ей делать карьеру, оберегал ее и, как сам часто шутил, делал ее сны явью. Хотя и ненамеренно, именно Стратмор привел Дэвида Беккера в АНБ в тот памятный день, позвонив ему по телефону.

Motor Rewinding Pdf

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    Electric Motors and Drives. Fundamentals, Types and Applications. Third edition. Austin Hughes. Senior Fellow, School of Electronic and Electrical Engineering.

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