Another innovation that merits discussion is laminatedframe
motor technology. Laminated-frame motors consist of
a stack of laminations permanently riveted under controlled
pressure. The cast iron outer frame normally associated with
a NEMA motor is eliminated, allowing more room for
active (torque-producing) magnetic material. Figure 5
shows how the stator frame is constructed.
Another advantage of this construction is that the air
used to cool the motor is in direct contact with the stator
laminations. The heat transfer mechanism in a cast iron
frame motor is highly dependent upon the stator to frame
fit. Laminated frame construction eliminates this issue
In recent years, industry drivers have forced the
development of an optimized, finned, and laminated
motor design. To improve cooling and increase power
density, fins have been added to the exterior of the
stator laminations. These optimized cooling fins
increase the surface area available for heat dissipation,
resulting in improved heat transfer and a power
increase of 20–25% is typical for a given lamination
diameter and core length. Figure 6 shows the increased
surface area achieved by including these cooling fins.
Another innovation that merits discussion is laminatedframemotor technology. Laminated-frame motors consist ofa stack of laminations permanently riveted under controlledpressure. The cast iron outer frame normally associated witha NEMA motor is eliminated, allowing more room foractive (torque-producing) magnetic material. Figure 5shows how the stator frame is constructed.Another advantage of this construction is that the airused to cool the motor is in direct contact with the statorlaminations. The heat transfer mechanism in a cast ironframe motor is highly dependent upon the stator to framefit. Laminated frame construction eliminates this issueIn recent years, industry drivers have forced thedevelopment of an optimized, finned, and laminatedmotor design. To improve cooling and increase powerdensity, fins have been added to the exterior of thestator laminations. These optimized cooling finsincrease the surface area available for heat dissipation,resulting in improved heat transfer and a powerincrease of 20–25% is typical for a given laminationdiameter and core length. Figure 6 shows the increasedsurface area achieved by including these cooling fins.
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