IEC motor frames refer to the standardized frame sizes for electric motors as specified by the International Electrotechnical Commission (IEC). These standards ensure compatibility and interchangeability of motors and their components across different manufacturers and applications. Below is an overview of IEC motor frames, including their designation and key dimensions:
IEC Motor Frame Sizes and Designations
IEC motor frame sizes are typically specified using a combination of numbers and letters, where the number indicates the motor’s shaft height (in millimeters) and the letter(s) indicate specific configurations or mounting styles. The shaft height is the distance from the base of the motor to the centerline of the shaft.
Common IEC Frame Sizes:
- 56: Shaft height of 56 mm
- 63: Shaft height of 63 mm
- 71: Shaft height of 71 mm
- 80: Shaft height of 80 mm
- 90: Shaft height of 90 mm
- 100: Shaft height of 100 mm
- 112: Shaft height of 112 mm
- 132: Shaft height of 132 mm
- 160: Shaft height of 160 mm
- 180: Shaft height of 180 mm
- 200: Shaft height of 200 mm
- 225: Shaft height of 225 mm
- 250: Shaft height of 250 mm
- 280: Shaft height of 280 mm
- 315: Shaft height of 315 mm
- 355: Shaft height of 355 mm
Key Dimensions and Specifications
Each frame size has specific dimensions for various parts of the motor, including:
- Shaft Diameter (D)
- Shaft Length (L)
- Bolt Hole Diameter
- Bolt Circle Diameter
- Overall Motor Length
- Motor Width
- Mounting Hole Spacing
Example of IEC Frame Specifications (Frame Size 80):
- Shaft Height (H): 80 mm
- Shaft Diameter (D): 19 mm
- Keyway Width (K): 6 mm
- Bolt Hole Diameter (A): 8.5 mm
- Bolt Circle Diameter (B): 100 mm
- Overall Motor Length (L): Varies by manufacturer and motor type
Mounting Configurations
IEC motor frames can come in different mounting configurations, denoted by letters. Common configurations include:
- B3: Foot-mounted
- B5: Flange-mounted
- B14: Face-mounted
- B35: Foot- and flange-mounted
Usage and Applications
IEC standardized motor frames are used in a variety of applications across different industries, including:
- Industrial Machinery
- HVAC Systems
- Pumps and Compressors
- Conveyors
- Fans and Blowers
Conclusion
Understanding IEC motor frames is crucial for selecting the appropriate motor for your application. These standards ensure that motors from different manufacturers can be easily integrated and replaced, facilitating maintenance and enhancing operational efficiency. When selecting a motor, always refer to the specific IEC frame size and configuration to ensure compatibility.
