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  • Help with IEC Motor frame sizes

    Discussion in 'The main mechanical design forum' started by cwsink, May 29, 2012.

    1. cwsink

      cwsink New Member

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      Can anyone tell me more about the IEC motor frame sizes? More specifically, I'm not sure what the designation IEC B5 90 S/L would mean. How does it compare to a B5 90 frame?

      Thanks,

      craig
       
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    3. PWASS

      PWASS Well-Known Member

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      Craig

      90 is the motor frame size, the shaft centre is 90mm from the feet.

      The 'B5' designation is the type of mounting, B3 is foot mounted only, B5 is large front flange (D Flange) with no feet, B14 is small front face (C Face) with no feet, B35 is as B5 but with feet and B34 is as B14 with feet.

      The S and L denote the motor length (S = Short, L = Long) on this frame size L is 30mm longer than S.

      At nominal 1500RPM (50Hz) a 90S frame is 1.1 Kw and a 90L frame is 1.5Kw.
       
    4. cwsink

      cwsink New Member

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      Thanks Peter. Couple further questions. You said the L is 30mm longer than the S. What exactly is longer? The motor body?

      Also, is there ever a designation that is B5 90 without the S or L?

      Thanks,
       
    5. PWASS

      PWASS Well-Known Member

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      Craig

      For a given frame size, the shaft diameter, shaft length and foot mounting holes remain constant, the change in length is at the rear of the motor body, behind the motor feet.

      B5 90 is the basic frame size and mounting details without reference to the motor power output and speed.
       

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