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Frameless Motor Mounting Practices: Bonding with Structural Adhesives

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 Bonding 1

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KBM-43X03 Mounting Example Bonding 2

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KBM-43X03 Mounting Example Bonding 3

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KBM-43X03 Mounting Example Bonding 4

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KBM-43X03 Mounting Example Bonding 5

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  • Recommended for KBM Frame size 118XX and smaller
  • Recommended Structural Epoxy:
    • 3M Scotchweld 2214
    • Hysol EA934NA
  • 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
    • Slip fit with housing of 0.1-0.2 mm over stator OD max
    • Adhesive grooves with extra slip fit gap of 0.13-0.26 mm
    • Parts will “self-center” during cure by orienting in vertical axis
    • Maximum Cure temperature of 155 C to prevent insulation damage
  • Please Note that:
    • Adhesive manufacture guidelines should be followed
    • Other adhesives can be used
    • Customer ultimately responsible for proper design of:
    • Housing dimensions accounting for thermal effects
    • Proper surface preparation and application of adhesive

KBM-43X03 Mounting Example Bonding 6

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KBM-43X03 Mounting Example Bonding 7

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KBM-43X03 Mounting Example Bonding 8

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Mounting Considerations

Bonding with Structural Adhesives

  • Bearing precision and machining tolerances are dependent more on customer machine requirements than frameless motor mounting requirements
  • Structural adhesives represent a cost-effective, industry proven, 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