What Are Electric Motor Housing Types and Where Are They Used

Short Answer 

Electric motor housing types are among the fundamental mechanical structures that directly affect a motor's operating performance, durability, and system integration. Selecting a housing that is suitable for the operating environment and mounting configuration contributes to safer operation and a longer service life of the motor. 

Summary

• Electric motor housing types directly affect the motor's durability, thermal management, and operating performance.
• According to the mounting configuration, different housing designs are available, including foot-mounted, flange-mounted, and vertical mounting arrangements.
•  Aluminum and cast iron housing types offer different advantages in terms of weight, durability, and application.
• Enclosed and fan-cooled housings can provide enhanced protection against external factors such as dust, moisture, and temperature.
• The appropriate housing should be selected based on the operating environment, load characteristics, and mounting requirements.

Why Is the Housing Type Important in Electric Motors?

The structure of an electric motor not only holds its components together but also directly determines the motor's resistance to harsh operating conditions and its ability to integrate with the mechanical system. Commonly encountered in engineering applications across the industry, electric motor housing types provide different operational capabilities depending on the material and design of the housing. 

The importance of selecting the appropriate motor housing type for the right project, along with the direct impact of this selection on the application, can be summarized as follows:

• In electric motors, housing types prevent harmful substances such as dust, liquids, moisture, and chemical contaminants present in the operating environment from entering the winding compartment.
• The heat generated during motor operation is dissipated to the surrounding environment through the specially designed cooling fins on the housing surface, ensuring that the system maintains an optimum operating temperature.
• A robust and rigid outer housing absorbs mechanical vibrations generated under high torque and heavy loads, preventing premature wear of the bearing and shaft assembly.
• The housing design directly determines whether the motor will be secured to the driven equipment by means of feet or through a flange connection.

Optimizing the mechanical housing design, as well as the electrical power characteristics, in engineering designs helps ensure the uninterrupted and safe operation of the entire industrial production line.

What Are the Types of Electric Motor Housings? 

Electric motor frame sizes are classified according to IEC frame configurations specified by IEC standards. The types of electric motor housings used in various industrial applications vary depending on the system requirements. 

The motor housing types most commonly used in accordance with IEC standards are as follows:

• 63 Frame: Used in small fan systems and light-duty applications.
• 71 Frame: Preferred for low-power machinery thanks to its compact design.
• 80 Frame: Commonly used in conveyor systems and small pump applications.
• 90 Frame: Preferred for medium-scale industrial applications.
• 100 Frame: Used in systems requiring higher torque.
• 112 Frame: One of the housing configurations commonly preferred for compressors and process applications.
• 132 Frame: Provides a robust industrial motor housing designed for demanding operating conditions.
• 160 Frame: Used in industrial applications requiring high power output.
• 180 Frame and Larger: Preferred for large-scale production lines and heavy industrial systems.

Selecting an electric motor housing type that is appropriate for the intended application is essential to ensuring long service life and safe operation.

Electric Motor Housing Types by Mounting Configuration 

In electric motors, the mounting configuration is one of the fundamental engineering criteria that determines how the motor will be connected to the system and in which position it will operate. 

The main electric motor housing types based on mounting configuration are as follows:

• B3 Foot-mounted Housing: Designed for horizontal mounting. Secured to the foundation by means of mounting feet.
• B5 Flange-mounted Housing: The motor is connected to the system through the flange located on its front face.
• B14 Flange-mounted Housing: Provides a compact mounting arrangement for applications with limited installation space.
• B35 Combined Mounting Housing: Provides the flexibility of both foot-mounted and flange-mounted configurations.
• Vertical Mounting Types: Preferred for pumps and vertical drive applications.
• Horizontal Mounting Types: Commonly used in fans, conveyors, and general industrial systems.
• Housing Selection Based on Mounting Location: Flange-mounted configurations are more commonly preferred in confined spaces, while foot-mounted systems are more frequently used in heavy-duty applications.
• Motor Frame Sizes: IEC frame sizes, including Frame 63, 71, 80, 90, and larger, directly influence the mounting configuration.

Selecting the appropriate mounting type supports more stable motor operation while helping to reduce vibration and alignment issues.

Electric Motor Housing Types by Material 

The housing material used in electric motors directly affects the motor's weight, durability, and operating performance.

The main electric motor housing types based on material are as follows:

• Aluminum Motor Housing: Its lightweight construction facilitates transportation and installation.
• Cast Iron Motor Housing: Provides high durability for heavy industrial applications.

In addition to material selection, the housing design should also incorporate protection features suitable for the motor's operating environment. 

Finned housing designs promote more efficient heat dissipation, while corrosion-resistant surface treatments can extend the service life of the motor in environments exposed to moisture and chemical agents. In addition, robust housing designs provide enhanced protection against vibration, impact, and demanding operating conditions, helping to preserve motor performance.

Selecting a housing design that is appropriate for the intended application is of great importance in industrial environments.

Electric Motor Housing Types by Protection Design 

In electric motors, the cooling and protection design not only controls the motor's operating temperature but also directly affects its resistance to external factors. Selecting an appropriate cooling method helps improve both motor performance and service life.

The main motor housing designs based on the cooling method are as follows:

• IC410 (Non-Ventilated Motor): A motor design that operates by means of natural air circulation without the use of an external fan. Preferred for low-power and specialized applications.
• IC411 (Totally Enclosed Fan-Cooled (TEFC) Housing): One of the most common motor cooling designs, providing airflow over the housing by means of a fan mounted on the motor shaft.
• IC416 (Force-Ventilated Housing): Provides effective cooling by maintaining continuous airflow with the aid of an external, independent fan, making it particularly suitable for inverter-driven and low-speed applications.
• IC611 (Closed-Circuit Cooled Housing): An advanced cooling system in which the internal and external air circuits are isolated from each other, designed for high-power and heavy-duty applications.

In addition to its cooling design, the protective features of the motor housing are also of significant importance. While IP protection ratings define the motor's level of resistance to water and dust, appropriate ventilation designs and housing constructions capable of withstanding high temperatures help ensure more reliable performance under demanding operating conditions.

Selecting a motor with an optimal cooling and protection design enhances operational safety while contributing to the motor's long service life and efficient performance.

Differences Between Electric Motor Housing Types 

Selecting an electric motor housing type that is not suited to the application requirements may result in performance loss, overheating, and mechanical stress. 

The main differences between electric motor housing types are as follows: 

The appropriate motor housing should be selected by taking into consideration the application, load characteristics, and operating environment. 

Where Are Electric Motor Housing Types Used?

Selecting the appropriate electric motor housing type can improve system compatibility, ease of installation, and operational efficiency. The appropriate mounting arrangement should be selected by considering the equipment to which the motor will be connected, its operating position, and the mechanical requirements of the application.

The motor housing types most commonly used according to installation arrangements are as follows:

Selecting a mounting arrangement that is appropriate for the mechanical configuration of the application contributes to the safe operation of the motor and its long-term performance. Therefore, when evaluating mounting types such as B3, B5, B14, B35, and B34, both the operating conditions and system requirements should be taken into consideration. 

How to Select the Right Electric Motor Housing Type

When selecting an electric motor housing type, both the motor power and the physical conditions of the operating environment should be taken into account. For example, enclosed housing designs provide safer operation in dusty and humid environments, while cast iron motor housings offer greater durability for systems operating under heavy loads. 
 

Selecting the appropriate electric motor housing type directly affects the motor's thermal management, vibration stability, and long-term performance. Therefore, electric motor housing types used in different applications should be evaluated based on their mounting configuration, operating orientation, and operational duty.