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AC motors are driven by an alternating current and are a highly efficient way of turning electrical energy into mechanical motion. AC motors differ from DC (Direct Current) Motors in that they are brushless, meaning less need for maintenance and a typically longer life expectancy. Unlike DC motors, the output speed for AC motors is typically controlled by a frequency drive control.

### What are the types of AC motors?

The RS Range of AC motors includes the following:

- **AC induction motors** are typically used in kitchen appliances, automobiles and industrial machinery, induction motors have an output rotation speed that is proportional to the applied frequency of the alternate current.
- **AC synchronous motors** are so-called because the speed of the rotor is proportional to the stator, synchronous AC motors are used where accuracy is an important factor, such as clocks and timers.
- **AC squirrel cage motors** are a type of induction motor that uses a cage rotor instead of a wound rotor, and as such is considered to be more rugged and less maintenance heavy. Squirrel cage induction motors are often used in applications where a low starting torque is required and no speed control is needed, such as pumps and air compressors.
- **AC shaded pole motors** are a single-phase squirrel cage motor that uses an auxiliary winding composed of either a copper ring or bar, called a shading coil. Unlike standard squirrel cage motors, they are suited for multiple speeds and are often used in fans.
- **AC geared motors** integrate a gear reducer with an electric AC motor to deliver high torque at low speed or low horsepower. Operating at low speed allows these motors to exert greater power.
- **AC servo motors** feature a rotary actuator that allows for precise control of angular position. The motor is attached by gears to the control wheel, as the motor rotates, the position sensors resistance changes, so the control circuit can precisely regulate movement.
- **AC Stepper Motors** are commonly used as an output in electronic circuits, it divides a full rotation into a number of equal steps.

 **Applications** 

- Appliances.
- Compressor drives and systems.
- Computers.
- Conveyor systems.
- Fans and air conditioners.
- Hydraulic and irrigation pumps.
- Transportation equipment.

For more information, check out our [AC motors guide](/web/content/discovery/ideas-and-advice/ac-motors-guide).



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AC Motors | AC Induction & Geared Motors | RS

AC Motors

Siemens 1FL6044 Synchronous AC Motor 230 V, Flange Mount Mounting

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Siemens 1FL6042 Synchronous AC Motor 230 V, Flange Mount Mounting

Siemens 1FL6054 Synchronous Servo Motor 1 Phase, 230 V

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Synchronous AC Motors | RS

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Single phase motors are a type of AC motor that uses electromagnetic principles to create useful rotational energy, they operate in a similar way to 3 phase motors but are simplified. These motors need less maintenance than 3 phase motors, and will normally last longer. Single phase motors are used in equipment and machines that are smaller in size and require lower horsepower.Types of single Phase Motor <ul><li>Split phase motor.</li><li>Capacitor start motor.</li><li>Capacitor start capacitor run motor.</li><li>Permanent split capacitor (PSC) motor.</li><li>Shaded pole motor</li></ul>;Applications:<ul><li>Pumps</li><li>Fans</li><li>Refrigerators</li><li>Compressors</li><li>Portable Drills</li></ul>

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Squirrel Cage Motors | RS

Squirrel cage motors are a type of induction motor. They are called squirrel cages because the shape of their rotor &ndash; the inner component connected to the output shaft looks like a cage. squirrel cage motors work no differently than most other induction motors and only differ in the specific interaction between rotor and stator. These motors are particularly suited for applications where the motor must maintain a constant speed, be self-starting, or there is a desire for low maintenance.Applications<ul><li>Centrifugal pumps</li><li>Industrial drives (e.g. to run conveyor belts)</li><li>Large blowers and fans</li><li>Machine tools</li><li>Lathes and other turning equipment</li></ul>&

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3 Phase Motors | RS

3 Phase motors are AC Motors that are either an induction motor (also known as an asynchronous motor) or a synchronous motor. These motors are designed to run on the three-phase alternating current (AC) power used in many industrial applications. AC electricity changes direction from negative to positive and back many times a second.The motors feature 3 main components:<ul><li>Stator</li><li>Rotor</li><li>Enclosure</li></ul>Applications of 3-Phase Induction Motors:<ul><li>Pumps and submersible</li><li>Pressing machine</li><li>Lathe machine</li><li>Grinding machine</li><li>Conveyor</li><li>Flour mills</li><li>Compressor</li><li>Low mechanical power applications</li></ul>

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AC Induction Motors | RS

Induction motors are also known as &lsquo;asynchronous motors&rsquo; because they operate at a speed less than their synchronous speed. The advantage of AC induction motors is their simplicity. Induction Motors have only one moving part, the rotor, which makes them low-cost, quiet, long-lasting, and relatively trouble free.Applications<ul><li>Water Pumps</li><li>Kitchen Appliances</li><li>Fans and Air Conditioners</li><li>Industrial Machinery</li></ul>

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