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3 Phase Motors

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A 3-phase motor refers to an electrical-to-mechanical energy conversion mechanism that can convert an input of 3-phase electrical power to produce an output of mechanical energy. Read More…

3 Phase Motors 3 phase motors are a type of electric motor that operates based upon a three-phase electrical load, which is a common form of electric power transmission.
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Leading Manufacturers

Stratham, NH  |  844-338-8114

We manufacture motors, motion control and rotating products for OEMs. The electric motors obtainable through us include AC motors, AC/DC motors, brushless DC motors, stepper motors.

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ElectroCraft, Inc. $$$

Monroe, WI  |  608-325-9161

Since our inception in 1932, Carter Motor manufactures AC universal motors, small motors, DC universal motors, DC permanent magnet motors, DC shunt wound motors and gearmotors, and many others. All of our products are designed and assembled here in the USA. Our team is here to help you determine the best motor to fit your application and to ensure the process is efficient and stress-free. We are ISO 9001:2015 certified.

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Carter Motor Company $$$

Reedsburg, WI  |  608-524-4341

Hankscraft OEM is recognized as a Six Sigma Black Belt-certified, low risk manufacturer. Founded in 1920, Hankscraft has been producing dependable, high-value components and complete turn-key solutions for Fortune 500 companies and others where manufacturability and profitability are key.

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Hankscraft, Inc. $$$

Milwaukee, WI  |  800-466-6398

Dietz Electric is a full-service company specializing in the manufacture of high-quality electric motors, AC and DC motors, brushless motors, special motors, servo motors, hazardous area motors, custom motor designs, modifications and repairs. We also stock several name-brand electric motors. Our experienced staff enables us to deal with difficult and demanding motor applications.

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Dietz Electric Co., Inc. $$$

Burton, MI  |  877-986-6867

Electric Motor Warehouse offers a complete online catalog of electric motors and swimming pool pumps. We carry all the name brand manufacturers you know and trust. All of our products are brand new and we ship 99% of our orders within 24 hours. Our website has hundreds of competitively-priced products listed with more being added all the time and we sell directly to customers. We're here to help!

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Electric Motor Warehouse $$$

Duluth, GA  |  800-275-4934

America’s largest electric motor company brings you electric motors built to make your specific agricultural, industrial or commercial processes run with efficiency & reliability. Fractional, explosion proof, NEMA, severe duty, pump & DC motors are just a few of our ISO 14001 certified electric motors.

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WEG Electric Corp. $$$
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What Is a 3-Phase Motor?

A 3-phase motor refers to an electrical-to-mechanical energy conversion mechanism that can convert an input of 3-phase electrical power to produce an output of mechanical energy.

3-Phase Motor

The motor consists of a rotating rotor and a stator. The stator winding receives the 3-phase supply of electrical energy and drives the rotor windings through electromagnetic induction.

How 3-Phase Motors Function

As the 3-phase stator winding receives a balanced supply of 3 phase electrical energy, a rotating magnetic field is produced in the motor. The rotating magnetic field rotates around the stator at a synchronous speed that is denoted by:

Synchronous speed = 120 f / P

Where f is the frequency of rotation and P is the number of poles.

3 Phase Motor Working Principle

Since the rotors carry a current and are in the magnetic field produced by the stator winding, they experience a mechanical force. The combined forces experienced on all the rotor conductors result in a torque which drives the rotors in the direction of the rotating magnetic field.

Types of 3-Phase Motors

There are two main types of 3-phase motors: the squirrel cage and the slip ring motors. The differences are mainly based on rotor windings.

Squirrel Cage Motor

The structure of this rotor assembly resembles the shape of a squirrel cage. The construction is simple and rugged and consists of a cylindrical laminated core rotor with slots on the external periphery. The squirrel cage has rotor bars instead of the expected rotor windings.

Squirrel Cage Rotor

The bars are made of aluminum, copper, or brass. The rotor bars are welded or braced with the end rings for mechanical support. Normally the bars are short-circuited to add external resistance to the circuitry.

This type of motor does not use slip rings or brushes, making construction simpler and very robust.

Slip Ring Motor

Slip ring induction motors are also referred to as wound motor rotors. It consists of a laminated cylindrical core with slots on the outside periphery and the rotor winding placed within them.

The winding is wound so the number of poles in the rotor winding is equal to the stator winding. The end terminals of the rotor windings are then connected to the slip rings.

Slip Ring Motor

An external resistance can be connected easily to the rotor circuit through the brushes and slip rings. This is important in controlling the speed and torque of the motor.

Applications of 3-Phase Motors

Slip ring motors are usually used for devices like plunger pumps, cranes, conveyors, crushers, or elevators. In addition, slip ring induction motors are commonly used for loads that need a very high initial torque and usually for cases where the starting current is low.

They are also ideal for the carriage of loads that require speed control and altering the spin rate. Squirrel cage motors have a normal initial torque with a high starting current. The motors are commonly used in appliances like electric blowers, fans, and centrifugal pumps.

Crane Motor

Advantages of 3-Phase Motors

3-phase motors have a simple and rather rugged construction. Once set up, they do not require extensive maintenance and are therefore less expensive.

3-phase motors have very high efficiency and a favorable power factor. Thus, for a given load, they draw fewer volt-amperes.

3-phase motors also have a self-starting torque.

These types of motors, if accurately set, can be left out to work automatically without the need for human control but rather scheduled maintenance after a specified duration.

Typical examples are the case of conveyor belts and building elevators that can function automatically without constant control.

Single-phase systems can yield pulsating power, but 3-phase systems yield a more stable power supply.

3 Phase Motors Informational Video

 

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