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A Buyer’s Guide to AC Motor!

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The word “Motor” is derived from the Latin word “Movere” which means to move. Electrical energy is transformed into mechanical energy via a motor. A type of motor that converts AC (alternating current) into mechanical power is called an AC motor. AC motor stands for Alternating Current motor. Alternating current motors or simply known as AC motors, are utilized in a wide range of applications.

If you are interested to know more about these advanced gadgets, then you are at the right place. Read on to know more about AC motors.

AC Motor:

A type of motor that uses an electromagnetic induction process to convert the alternating current into mechanical power is called an AC motor. As the name indicates, an AC is used to power this motor. These are the most common types of motors available in the market. Why? Because they are relatively inexpensive and simple to manufacture. Also, they are very reliable. If we talk about their work, they work by following the principle of Electromagnetic Induction.

Electromagnetic Induction can be defined as

The production of an electromotive force across an electrical conductor in a changing magnetic field is called magnetic or electromagnetic induction”

An alternating motor can be single-phase or three-phase. The first AC motor was invented by Nikola Tesla in 1997. Enough talking generally about alternating motors. Now, let’s dive into its structure.

Important Parts of AC Motor:

Several important parts, including stator, rotor, exterior drum, etc, play an important role in the working of AC motors. Damage to any part can result in faulty working of the machine or the machine may not work at all. Some important parts of the AC motor are listed hereunder:


The most important part of an AC motor is the stator. It is a solid metal axle consisting of a coil and wire loop. Besides that, it also has a connector and squirrel cage. Now, you will be wondering what a Squirrel cage is?

It is a cylindrical shaped cage that fits around the shaft with bars extending between its two ends. End rings are attached at the ether end of the cage in order to create a short circuit.

However, it is not present in every AC motor. The stator received direct electricity. Numerous plates made up of copper extend out from the stator’s center.


Another important part of an AC motor is the rotor. The AC motor’s rotor is not connected to the external electricity source. The stator plays an important role in strengthening the rotor. The rotor of a  3-phase induction motor can be wrapped or squirrel cage.

Rotors of AC motors are divided into two categories:

Phase wound rotor

Squirrel cage rotor

If the motor is equipped with a squirrel cage motor, then it would be called a squirrel cage induction motor. Similarly, if the motor is equipped with a phase wound rotor, it will be known as a phase wound induction motor.


Besides the stator and rotor, the shaft also plays an important role in the proper functioning of the motor. It is the rotating part of the motor that helps in connecting the load to the rotor. It is generally made from steel and is supported by bearings in the motor.


Penultimately, the bearings are used to support the shaft in the motor. Their main function is to rotate the shaft freely.  They can be made up of bronze or steel.


Lastly, as suggested by the name, the enclosure protects the internal component of the motor from environmental damage. It is generally made of plastic or metal.

How Alternating Motor Works?

The working of alternating motor is discussed hereunder:

Alternating motor works on the principle of Lorentz Force Equation. According to this equation:

When a current-carrying conductor is subjected to a magnetic field, it generates magnetic lines of force. “

Generally, Lorentz Force is the combination of magnetic and electric fields on a point charge due to the effect of electromagnetic waves.

Due to the effect of the Lorentz equation, when an AC is transmitted to the coil of the rotor, it experiences some force. As a result of this force, torque is generated in a dextral direction. Ultimately, this allows the rotor to rotate.

In ordinary AC motors, the field winding is present on the stator. However, the armature winding rotors are present on the rotor. The efficiency of a machine is directly proportional to the size of the machine. As the size of the machine increases, so does the size of brushes and commutators.

Note: The rotor and stator windings are housed on the armature in the accurate configuration to prevent the above issues.

How Many Types of AC Motors Are There?

There are two basic types of AC motors.

1.Induction motor

2.Synchronous motor

Induction Motor:

The motor that works by using an electromagnetic induction process to convert the electrical energy into mechanical energy is called an induction motor. An induction motor works on the principle of Faraday’s Law of Electromagnetic Induction. Each coil on the rotor is short-circuited, which is cut by the magnetic flux from the stator. The power flows through the coils of the rotor due to the fact that they are short-circuited.

Besides the fundamental parts, the induction motor includes a core, terminal box, and winding.

The induction motor is further classified as single-phase induction and two-phase induction.

Single-Phase Induction Motor:

The type of motor that specifically operates on single-phase alternating current power is called a single-phase induction motor. They are commonly used in home applications, including air conditioners, fans, and refrigerators.

Two-phase Induction Motor:

They are more efficient and robust compared to single-phase induction motors. They are used in industrial equipment including pumps, heavy machinery, and conveyor systems.

Synchronous Motor:

A type of AC motor that generates mechanical energy from electrical energy and works only at synchronous speeds is called a synchronous motor. No induction current is required for these types of motor. Synchronous motors use electromagnets on the stator. The role of electromagnets is to generate a spinning magnetic field.

The important part of the synchronous motor includes the following:


2.Rotor field winding

3.DC excitation

4.Stator armature winding

5.3-phase AC supply

How Are AC Motors Different From DC Motors?

Doubtlessly, AC motors are different from DC motors in several parameters. Interested to know how they are different and special from DC motors? Continue reading:

Power Source:

AC Motor: This type of motor only operates with an alternating current. Input of electric motor’s play an important role in generation of mechanical energy from electrical energy.

DC Motor: On the other hand, a direct current is supplied to such motors to function. The battery and power supply are two important examples of DC power sources.

Position of Armature:

AC Motor: It has a rotating magnetic field with stationary armatures.

DC Motor: It has rotating armatures with a stationary magnetic field.

Current Input:

AC Motor: This type of motor uses alternating current.

DC Motor: This type of motor uses direct current.

Load Change:

AC Motor: Alternating current motors are useful when variable torque and high speed is required.

DC Motor: Direct current motors are best for applications when high torque and moderate speed are required.


AC Motor: They are less efficient compared to direct current motors. Their efficiency is compromised due to motor slip and loss of induction current.

DC Motor: They are highly efficient compared to alternating current motors. They are highly efficient because they do not generate induction currents. Furthermore, no motor slip occurs in such motors.

What are the Applications of AC Motors?

AC motors for sale find their place in numerous applications. They are used in the following industrial equipment:

1. Pumps and compressors

2. Fans and blowers

3. Conveyors

4. Machine tools, including lathes, milling machines, grinding machines, drilling machines, etc.

5. Crane and hoist drives, including overhead cranes, construction hoists, and gantry cranes.

6. Industrial robotic equipment, including assembly robots, robotic arms for welding, packaging robots, etc.

7. Injection molding and extruders

Commercial applications of AC motors include the following:

1. HVAC systems

2. Elevators and escalators

3. Food and beverage processing equipment, including mixing machines, conveyor bolts, etc.

4. Textile machines, including weaving machines, spinning machines, etc.

5. Printing machines

If we talk about their use in residential applications, they can be found in the following equipment:

1. Washing machines

2. Ceiling fans

3. Power tools

4. Garage door openers, etc.

Besides being used in commercial and industrial applications, they are widely used in the transportation sector in the following applications:

1. Electric vehicles, including both hybrid electric vehicles (HEVs) and electric vehicles (EVs)

2. Golf carts

3. Railway systems

4. Marine applications

Best Supplier of AC Motor:

If you want to buy an AC motor from a professional company and are looking for a leading company with a great reputation in the industry, then look no further. Why? Because we have got you. Gzdongyi is a professional company engaged in the research and development, production, sales and services of motor controllers.

Our company specializes in the production of various tram accessories, including AC motors for domestic and foreign markets. So what are you waiting for? Contact us today to get a quote!

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