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Frameless Motor Mounting Practices: Clamping and Bolting

Embedded Motion Technology - Frameless  Mounting Considerations

  • The benefits of Improved System Performance, Reduced Maintenance, Smaller Mechanical Footprint, Higher System Efficiency are understood
  • Customer still has a key question in mind …  
  • I like the frameless design concept but how do I mount the motor components into my machine?

Mechanical Mounting Considerations

  • Customer’s own bearings
  • Customer’s shafting / drivetrain
  • Bearing precision and machining tolerances are dependent more on customer machine requirements than frameless motor mounting requirements
  • Run-out more dependent on customer requirements
  • Air gap of 0.015” – 0.075” (0.38 mm – 1.9 mm) each side   of rotor needed for frameless motor 
  • Mounting; Bonding, Clamping, and Shrink fit options discussed in some detail in the KBM Selection Guide

Radial Running Clearance – “AirGap”

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KBM-43X03 Mounting Example Clamping & Bolting 1

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KBM-43X03 Mounting Example Clamping & Bolting 2

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KBM-43X03 Mounting Example Clamping & Bolting 3

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KBM-43X03 Mounting Example Clamping & Bolting 4

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KBM-43X03 Mounting Example Clamping & Bolting 5

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KBM-43X03 Mounting Example Clamping & Bolting 6

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KBM-43X03 Mounting Example Clamping & Bolting 7

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Clamping

  • Recommended for KBM Frame size 118XX and smaller
  • Designed for easy removal or maintenance acces•
  • Design Recommendations
    • Cylindrical cup shape customer housing
    • Locating shoulder for precise location
    • Lead in chamfer to aid in assembly operation
    • Maintain clearance over potted winding surfaces > 2 mm
    • Precise Location Slip Fit with housing of 0.10-0.05 mm over stator OD typical
    • Maintain gap behind clamp ring to allow for compression on stator
    • Engage at least half of the stator shoulder with the clamping ring
  • Please Note that:
    • Engineering Best Practices should be followed for determining the number and size of clamping ring bolts as required for the torque capacity of motor

KBM-43X03 Mounting Example Clamping & Bolting 8

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KBM-43X03 Mounting Example Clamping & Bolting 9

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KBM-43X03 Rotor Bolting Example

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Clamping & Bolting:

  • Bearing precision and machining tolerances are dependent more on customer machine requirements than frameless motor mounting requirements
  • Clamping and bolting represent a cost-effective, easily removable, and mechanically sound approach to frameless motor mounting
  • Several mounting options; Bonding, Clamping, and Shrink fit options are discussed in some detail in the KBM Selection Guide