Six Key Components That Make Up Your Industrial Electric Motor

Do you know what makes your industrial electric motor run smoothly and efficiently? Understanding the fundamental components of your motor is crucial for ensuring optimal performance and longevity. The six key components that are the backbone of every industrial electric motor: are the stator, rotor, bearings, enclosure, and cooling system.


The stator is one of the main parts of the motor. It consists of an iron core, windings and insulating materials. During the operation of the motor, the current transmitted from the stator winding forms a rotating magnetic field, causing the rotor to rotate.

Stators come in two main types: single-phase and three-phase stators.

Three-Phase Stators

Three-phase stators are the workhorses of industrial applications. They have three windings, each offset by 120 degrees, resulting in a rotating magnetic field with consistent torque production. These motors widely apply to manufacturing, HVAC systems, and heavy machinery.

Single-Phase Stators

They have a single winding that produces a pulsating magnetic field, which initiates motor rotation. Single-phase motors are prevalent in household appliances like fans and washing machines.


The rotor is another important component of the motor. It usually consists of two parts, including the rotor core and copper coil. Under the action of the magnetic field transmitted by the stator, the rotor will produce rotational motion, driving the driven equipment or machine to work.

Rotors come in two primary types: squirrel cage and wound rotors.

Squirrel-Cage Rotors

The rotor winding consists of multiple guide bars inserted into the rotor slot and two circular end rings. Small and medium-sized rotors generally use cast aluminum. For motors above 100KW, they are welded with copper bars and copper end rings.

Wound Rotors

Double-layer windings are mostly used, and the three-phase windings are connected in a star shape. The three terminal wires are connected to three copper (or steel) slip rings mounted on the rotating shaft and are connected to the external circuit through brushes.

synchronous reluctance motors and switched reluctance motors


Bearings are an important part of the industrial motor that supports the rotor. Its main function is to support the rotation of the rotor, reduce friction and wear, and reduce the noise when the motor is running. With ball bearings and roller bearings being the most common.

Ball Bearings

Ball bearings consist of small, rotating metal balls situated between two rings. They offer low friction and precise motion control, making them suitable for applications demanding high-speed operation and minimal heat generation.

Roller Bearings

Roller shafts, as the name suggests, use cylindrical rollers instead of balls to distribute the load. They excel in handling heavy radial and axial loads and often apply to industrial machinery and large motors.


The enclosure is a component of the motor that protects the stator and rotor. It can prevent dust and foreign matter from entering the inside of the motor. It also plays a role in sealing and fixing the stator winding. End caps are usually divided into two, namely front end cap and rear end cap.

Cooling System

The cooler dissipates heat from the stator and rotor inside the motor. Avoid damage to the internal components of the motor due to temperature rise, thereby ensuring the stable operation of the motor.

Terminal Box

The terminal box is a component of the industrial motor that connects the circuit and the power supply. It typically sits on the outer part of the motor housing and provides a secure and accessible point for connecting the motor’s internal wiring to external power sources and control systems.


The above are the six important components of the industrial electric motor. Together, they constitute the core structure and working principle of the electric motor, ensuring the normal operation and working efficiency of the electric motor.


Why are windings important in industrial electric motors?

Windings in the motor generate magnetic fields when electric current passes through them, essential for the motor’s operation.

What are the benefits of industrial motors?

High output power

Strong durability

quick response

High precision and controllability

What is the primary function of the rotor in an electric motor?

The primary function of the rotor in an electric motor is to generate mechanical motion or rotation. The rotor is the rotating component of the motor, and it interacts with the magnetic field produced by the stator (the stationary part of the motor).

When an electric current is passed through the windings in the stator, it creates a magnetic field that exerts a force on the rotor. This electromagnetic interaction between the stator’s magnetic field and the rotor causes the rotor to spin.

How can I ensure the longevity and optimal performance of my industrial electric motor?

Regular maintenance of electric motors, including inspections, lubrication of bearings, monitoring of winding insulation, and cleanliness of the commutator (in DC motors), is essential to extend the motor’s operational lifespan and maintain efficiency.

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