Design And Construction Of Low Voltage High Power Three-Phase Asynchronous Motors For Industrial Applications

Low voltage high power three-phase asynchronous motor

Figure 1: Low voltage high power three-phase asynchronous motor

Do you know how important low voltage, high power three-phase asynchronous motors are for industrial applications? Asynchronous motors provide reliable and efficient mechanical energy conversion, a key factor in the modern industrial sector. 

As the industrial industry rapidly expands, the demand for efficient motors increases. According to a survey, the production of low voltage, high power three-phase asynchronous motors has grown tremendously in the past couple of years.

Using variable speed drives (VSDs) can improve the efficiency of three-phase asynchronous motors by allowing them to operate at optimal speeds for different load conditions. A study by the US Department of Energy found that using VSDs can save up to 60% of energy in certain applications. 

We crafted this blog post to give more in-depth knowledge about designing and constructing low voltage, high power three-phase asynchronous motors. Let’s look at the design and construction of low voltage, high power three-phase asynchronous motors.

What is low voltage high power three-phase asynchronous motors ?| A basic overview

Figure 2 Low Voltage High Power Three-Phase Asynchronous Motor Drive                     

    Figure 2: Low voltage high power three-phase asynchronous motor drive

Low voltage three-phase asynchronous motor is a type of motor that runs on three-phase power, with the frequency and voltage staying constant regardless of the load. 

Asynchronous motors are designed to be efficient, reliable, and economical; they can perform well even at low speeds and handle high starting currents compared to other motors in the same size range. 

Low voltage means that the motor can be used in areas with limited power supply, and high power means that the motor can easily handle heavy loads.

Construction of a three-phase asynchronous motor

Figure 3 Low Voltage High Power Three Phase Asynchronous Motor Construction

Figure 3: Low voltage high power three phase asynchronous motor construction

To understand how a three-phase asynchronous motor works, it is important to know the components that make up the motor. The core of the engine consists of two main pieces:

1. A Stator

The stat is a stationary component that houses the motor’s windings. When energized, these windings create an electromagnetic field that interacts with the rotor’s magnetic field to rotate the motor.

2. Rotor

The rotor comprises several poles, each containing permanent magnet electromagnets. The rotor interacts with the stator’s magnetic field each time its windings are energized, causing it to rotate. The motor has a small air gap between the rotor and stator, which varies in size from 0.4 mm to 4 mm depending on the motor’s power.

Additionally, a three-phase asynchronous motor has other components such as slip rings (used for additional electrical connections), bearings (which support the rotor and help reduce friction), and an enclosure that houses all these elements. The construction must handle high temperatures, vibrations, dust, and dirt.

Factors that are significant in designing the low voltage high power three-phase asynchronous motor


We all know how important it is to ensure that a low voltage high power three-phase asynchronous motor, also known as an AC induction motor, works efficiently and effectively. 

Designing a motor does not simply select a few parameters and calculate some numbers; it also involves carefully selecting components. The factors that designers consider while designing a low voltage high power three-phase asynchronous motor include:

  • Stator winding arrangement

As we know, the stator winding arrangement is an important factor in determining the operating characteristics of an AC induction motor. This involves carefully selecting the type of stator winding connections, their number, and the number of motor poles. 

This may be done to meet specific performance requirements and ensure efficient power transfer from the stator windings to the rotor.

  • Voltage and Frequency

The voltage and frequency of the AC power supply must also be taken into consideration while designing a three-phase asynchronous motor. 

The motor must have an appropriate voltage rating that is compatible with the power supply and a suitable frequency range to ensure it responds appropriately to varying load conditions.

  • Cooling system

Do you know,

A key factor that affects motor performance is the temperature of its components. AC induction motors are designed with cooling systems such as forced ventilation or liquid cooling to dissipate heat and ensure reliability. This ensures that the electric motor operates within the temperatures specified by the manufacturer.

  • Power supply type

The type of power supply used to operate an asynchronous motor can impact its design performance. AC motors require a polyphase power supply, while DC motors need a single-phase or polyphase source.

If the electric motor is in hazardous areas, it must be certified for use in such environments by an accredited testing laboratory. This certification will ensure that it complies with all safety standards in hazardous environments.

Operating conditions for low voltage three-phase motors

Low-voltage three-phase motors are designed for continuous operation in standard industrial environments. The operating conditions for low-voltage three-phase motors vary by manufacturer, including temperature range, ambient humidity, and altitude levels. 

Keep in mind,

Following these guidelines when installing and operating the motor is important to ensure that it operates within its designed parameters.

  • Stand center height: 355~500mm.
  • Power range: 200 ~ 1400kW
  • Rated voltage: 380V (other voltages on request)
  • Rated frequency: 50Hz (or 60Hz)
  • Protection class: IP55
  • Insulation class: Class F
  • Operating system: S1

Industrial applications for low voltage three-phase motors

Low-voltage three-phase motors are designed for industrial applications requiring continuous operation. Common uses include fans and pumps, compressors, conveyor systems, elevators, and other types of motor-driven machinery.

The efficiency of a motor is an important consideration for industrial applications, as higher efficiency means lower energy consumption and cost savings. According to a study by Schneider Electric, high-efficiency motors can reduce energy consumption by up to 30% compared to standard motors. 

Note that,

Class F (S1) rated motors are the most efficient low voltage three-phase motors, offering up to 4% higher energy savings than other classes.

Industrial applications are not only limited to Class F-rated motors. Various motors suit every application, from general-purpose applications such as fans and pumps to more specialized engines for conveyor systems, elevators, and other motor-driven machinery.

Regardless of the application, selecting a motor with the durable construction and high-efficiency ratings needed to carry the load is important. With a wide selection of motor sizes and power ratings, you can find the right motor for your application needs.


That said, it is not enough to select the right motor. You must also ensure it is properly installed and maintained to guarantee longevity. By working with a knowledgeable partner who offers high-quality motors, you can ensure your industrial application runs smoothly and efficiently for years.

XINNUO Motor, the leader in the motor industry, offers a comprehensive portfolio of motors with superior efficiency ratings and durable constructions that can handle your toughest loading needs. With expert technical support and after-sales services, XINNUO Motors will help you do the job right! Get in touch today to learn how we can help you power up your industrial applications.

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