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What are the advantages of using an asynchronous motor?

The advantages of using an asynchronous motor include a simple and robust design, low maintenance requirements, and high reliability. Additionally, asynchronous motors are suitable for a range of applications, from low to high power, making them a versatile choice for various industries.
  • Asynchronous motors are simple in design, with few moving parts inside the body. They require no electrical connection between the stator and rotor and no brushes, slip rings, or permanent magnets. This simple design minimizes maintenance requirements and makes asynchronous motors highly reliable and durable. They typically last for many years, with minimal service required.
  • The simple construction of asynchronous motors results in low manufacturing costs. They are the lowest-cost type of motor to produce, especially in high-volume production. This makes them suitable for many cost-sensitive applications.
  • Asynchronous motors have high efficiency, converting most of the electrical energy into mechanical energy, especially for larger sizes. For very large motors, efficiencies of over 95% can be achieved. High efficiency helps minimize energy use and reduce operating costs. The speed of an asynchronous motor can be changed by using a frequency converter to control the frequency of the input power. This ability to adjust speed may be valuable for certain applications. Torque output also remains fairly constant over a wide speed range.
  • Once connected to the power supply, the asynchronous motors start by themselves. They do not require an external starting mechanism. The rotating magnetic field induced in the stator is sufficient to start the rotor spinning and accelerate it to operating speed.
  • Asynchronous motors can withstand harsh operating conditions and physical abuse. They can operate in harsh conditions without significant degradation in performance. Because they do not have slip rings, brushes, or permanent magnets, components that have limited tolerance to harsh environments, they are highly resistant to environmental contaminants.


In summary, asynchronous motors are prized for their reliability, low cost, efficiency, variable speed capability, self-starting ability, and rugged construction. For these reasons, they dominate most motor applications, especially those involving larger motors, and will probably continue to be an industrial workhorse.

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