Difference Between Induction Motor And Synchronous Motor Pdf

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Synchronous motor is a machine whose rotor speed and the speed of the stator magnetic field is equal.

All rotary electric motors, ac, and dc, operate because of the interaction of two magnetic fields. Rotation is caused by the interaction between the two fields. In a simple dc motor, there is a rotating magnetic field whose polarity is reversed every half turn by means of a brush-commutator combination.

Quick Answer: What Is The Difference Between Induction Motor And Synchronous Motor PDF?

Christian Cavallo. Electric motors come in hundreds of sizes, shapes, and varieties, and the sheer amount of choices can be paralyzing when looking for the best option. The first step in finding any motor is determining its power source; is it powered by AC current, or DC? However, both of these categories still contain many kinds of machines, so this article will help further differentiate the AC motor class our article on brushless vs.

AC motors can be split into synchronous motors and induction motors , and this article will give a brief explanation of both, and compare their working characteristics and applications. Induction motors are considered one of, if not the most prolific AC motor used in industry today. They were one of the first electric motors invented, and so have had ample time to be optimized to work in many applications.

They have a relatively simple build, consisting of an outer stator and an inner rotor, which interact via the electromagnetic induction effect to generate mechanical rotation. Specific types of induction motors achieve this rotation in different ways, and please feel free to read our articles on squirrel cage motors , wound rotor motors , and single-phase industrial motors to learn more.

Generally speaking though, the goal of induction motors is to pass an AC current through coils in the stator which will produce a magnetic field, and the oscillating frequency of the AC supply will cause this magnetic field to rotate.

This rotating magnetic field RMF will then induce opposing magnetic fields in the rotor — the free moving armature attached to the output shaft — and cause useful rotation.

These motors are also known as asynchronous motors, as the frequency of their AC current does not directly match the number of rotations of the output shaft. The existence of slip means precise timing is difficult with induction motors. As said before, these motors can be found in household appliances, electric vehicles, and even large mechanized industrial equipment, as they come in hundreds of speeds, torques, voltages, sizes, and forms.

For more information on these machines, learn more in our article all about induction motors. Synchronous motors match the output rotational frequency to the input AC frequency, allowing designers to use these motors in precisely timed applications, such as clocks, rolling mills, record players, and more.

They accomplish this feat by linking the magnetic poles the north-south pairs in every magnetic field of the stator and rotor, so that the stator RMF will turn the rotor at exact, synchronous speeds.

There are many ways to lock these poles, and our articles on reluctance motors and brushless DC motors give specific examples of these mechanisms. Note that the brushless DC motor is not an AC motor; this is because synchronous designs do not inherently have to be powered by AC power, whereas induction motors are typically always fed by AC power.

Synchronous motors are not inherently self-starting — that is, these motors often require motor starters to excite their rotors to full speed. To learn more, feel free to read our article on the types of motor starters. Also, even though their speed is synchronous, the speed of synchronous motors is difficult to change, and requires an AC motor controller to allow designers adjustable motor speeds more information can be found in our article on AC motor controllers.

Since these two types of AC motors are still quite broad, this article will give general comparisons between the operating characteristics of each type, so that designers can use this information to further define the best-suited machine for their specifications. Below, in Table 1, shows a qualitative comparison between certain characteristics shared between induction motors and synchronous motors and visualizes the advantages and disadvantages of each AC motor design.

The complexity or lack thereof of induction motors is the best advantage that they have over synchronous designs. They are very simple to manufacture, operate, and maintain, and is why induction motors are by and large less expensive than synchronous motors. As previously stated, induction motors are generally self-starting while synchronous motors are not. This means that induction motors require less external peripherals to work effectively, bringing down both their cost and complexity.

Power-density is the amount of power typically measured in units of horsepower HP or kilowatts kW generated per unit volume of the motor. Synchronous motors generally have a higher power density than induction motors of comparable size, allowing them to provide more power at a smaller volume. This is great for size-constrained applications and is a reason to choose a synchronous motor over an induction motor. The efficiency depends on the specific motor type and size, but the lack of slip in synchronous motors means there is less energy lost in converting between electrical energy and mechanical energy.

Power-factor is the ratio of working power to apparent power and is given as a percentage to show the efficiency of power distribution and its associated losses. For example: A factory needs to run at kW the working power , and the electrical meter connected to the power supply reads kVA the apparent power, which has units of a kilo-Volt-Ampere, or kVA, and is used to express energy to inductive loads such as motors coils, wires, etc. Oftentimes, synchronous motors are paired in tandem with induction machines to correct the inductive power losses of the induction motor, which represents another huge benefit of synchronous motors.

Finally, a common theme between synchronous motors and induction motors is their price separation. For reasons previously explained, synchronous motors are more expensive to produce, implement, maintain, and repair than induction motors. However, a case can be made that their energy savings and power-factor correction abilities may make up for their higher initial costs.

Whether ot not this holds true will ultimately depend on the specific applications at hand, but should be considered, as total life cycle cost should always be minimized in any project. This article presented a brief comparison between AC induction motors and synchronous motors. For information on other products, consult our additional guides or visit the Thomas Supplier Discovery Platform to locate potential sources of supply or view details on specific products.

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Induction motor vs synchronous: What’s the difference?

A synchronous motor is a constant speed machine, that is, the speed of the motor does not change with the load. This is because the speed of the motor depends on the supply frequency. Due to emerging need for variable speed and hence output frequency, the. In the previous article we came to know that synchronous motors are not self starting so to make them start automatically we should add some globalingredients. They are, 1. Using pony motors. Using small d.

A three phase Synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. The armature winding of the Synchronous motor is energized from an AC source and its field winding from a DC source. Synchronous motor is a machine whose rotor speed and the speed of the stator magnetic field is equal. Asynchronous motor is a machine whose rotor rotates at the speed less than the synchronous speed. Synchronous motor does not have slip.

Synchronous Motor : Types and Applications

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. Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans.

Recieve free updates Via Email! Home Electrical machines Power system Ask a question Contact electricaleasy. Share: Facebook Twitter Linkedin. AC motors can be divided into two main categories - i Synchronous motor and ii Asynchronous motor. An asynchronous motor is popularly called as Induction motor.

Christian Cavallo. Electric motors come in hundreds of sizes, shapes, and varieties, and the sheer amount of choices can be paralyzing when looking for the best option. The first step in finding any motor is determining its power source; is it powered by AC current, or DC? However, both of these categories still contain many kinds of machines, so this article will help further differentiate the AC motor class our article on brushless vs. AC motors can be split into synchronous motors and induction motors , and this article will give a brief explanation of both, and compare their working characteristics and applications.

Synchronous Motors vs. Induction Motors - What's the Difference?

In the electrical systems, we use either in industries, power stations or domestic needs, motors and generators have become a common thing. With the demand for high energy efficient and less power consuming systems, the invention of new models of these electrical devices is seen.

Starting Methods of Synchronous Motor

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Difference between Synchronous motor and Induction motor

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  1. Yoshi O.

    PDF | On Oct 3, , Muhammad Umer Farooq published difference between induction motor and synchronous motor | Find, read and cite all the research you​.

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