An AC motor is an electric device that converts electrical energy into mechanical energy through electromagnetic induction. The device finds a wide number of applications for both residential and commercial purposes. With the advancement, different types of AC motors have been developed to serve the varying needs of different industries. When dealing with these devices for any purpose, being informed about the varieties is essential to ensure the highest efficiency during operation. Find all types of AC motors here, along with a brief description for assistance in decision-making.
List of All Types of AC Motors
There are a variety of types of AC motors, such as synchronous, asynchronous, repulsion, reluctance and more. The distinct AC motor and its types are described as follows:
Synchronous Motors
These motors are characterised by the similarity in shaft rotation speed and AC current supply. They run at a constant speed equal to the supply frequency and convert electrical energy into mechanical form. They are of two types: excited and non-excited synchronous motors.
They depend on DC excitation to maintain synchronisation. The synchronous motors work with high efficiency at high power levels. However, they can not start on their own. Common applications are in clocks, power plants and industrial machinery.
Single-Phase AC Motor
These run on a single-phase power supply. The single-phase AC motors are smaller in size, generating power in fractional kilowatts. It contains two wires, the hot and neutral wires, and typically a capacitor to start. The single phase motors can offer up to 10 HP power. They are of multiple types: capacitor start, two-valve, shaded pole motors and others.
These electrical devices work on the principle of double revolving electrical field and hence involve two rotating magnetic fields generated in opposite directions. It leads to the production of balanced and counteracting torque, which enhances operational efficiency. These are cost-effective devices used in commercial equipment, industrial loads and even household appliances.
Polyphase AC Motor
Another one among the different types of AC motors, the polyphase motors are available in both two and three-phase operations. They are known for high starting torque, high efficiency and uninterrupted power delivery. They offer smooth operation due to the rotating magnetic field generated by multiple phases. Their reliable performance makes them a preference in industries.
The polyphase motors also require less input current compared to the single phase AC motor for generating the same power output. Accordingly, the three-phase polyphase system generates around 1.5 times more output than single-phase systems. Further, they deliver constant current. These motors find industrial applications in large fans, pumps, cranes, and machines that require high starting torque.
Reluctance Motors
These are simple, robust and cost-effective options capable of delivering high starting torque from a standstill. The reluctance motors are simple in design and lack any brushes, commutators, or permanent magnets. These are also lightweight, exhibit good efficiency at high speeds and have better thermal capabilities. The absence of rotor windings in reluctance motors minimises copper losses, subsequently contributing to high efficiency.
These are single-phase or three-phase motors that depend on reluctance torque. The latter is developed by the interaction between internal and external magnetic fields. The reluctance motors are suitable for operation in high-temperature environments as well. They find applications in home appliances, medical devices, power tools and electric vehicles.
Hysteresis AC Motor
It is among the single-phase synchronous AC motor types that work on the principle of magnetic hysteresis. The hysteresis motor has a special type of rotor comprising semi-permanent magnetic material on the surface and a non-magnetic core. Here, the rotor lacks windings and hence aligns with the rotating magnetic field generated by the stator to offer smooth and constant rotation.
The hysteresis motors are well-known for producing minimal vibration, precise speed control and quiet operation. They are capable of self-starting and delivering constant speed. They are also suitable for low-power applications due to limited torque output. The applications of hysteresis AC motors are witnessed in audio equipment, robotics, medical devices, electric clocks and timers and others.
Repulsion Motor
This is another single-phase motor involving a working mechanism of repulsion between the same magnetic poles. Apart from the main components, the stator and rotor, the repulsion motor also comprises a carbon brush assembly. The repulsion motors are preferred due to their running characteristics being similar to those of induction motors. The general applications can be found in pumps, refrigerators and compressors due to the high starting torque.
Asynchronous Motor
These are also referred to as induction motors and are commonly used among the mentioned AC motors and types. It produces rotational motion or mechanical power via the induced current in the rotor. It operates on the externally supplied AC current to the stator. The asynchronous motors are more efficient and reliable than the synchronous motors. Hence, they are suited for heavy-duty applications.
The asynchronous motors are well-suited for durability and efficiency. These are easy to maintain, scalable, and cost-effective. The asynchronous AC motors find application in transportation, manufacturing and HVAC. They are also widely used in conveyors, lifts and cranes, compressors, pumps and others.
Conclusion
AC motors function across both household appliances and industrial heavy-duty machines. Different types of AC motors exist based on the working principle, components, and other aspects that define their optimum usage. If you are looking for a specific function at your residential or commercial place, insights into AC motor and its types are necessary for effective decision-making. Head now to choose among the variety available at affordable prices. Also, find prices quoted specifically for your demand on top-notch AC motors from the best brands.
FAQs
What is the most popular AC motor?
The popular AC motor is an induction motor which finds applications across industrial machinery, household appliances and vehicles.
How to identify types of motors?
Electric motors possess nameplates that contain details like power source, motion output, and construction to assist in identification.
What is an AC motor with an example?
An AC motor is an electric motor capable of generating mechanical energy using electrical energy. The common example of AC motor usage is in household fans, air conditioners, electric ovens and others.
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