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Technical Data
Rotor Construction
- rotor core consists of
a solid stack of thin high-grade (low-loss) fully processed coated silicon
steel laminations
- core is pressed and
held together with two heavy rotor endplates and studs
- shaft is shrunk with a
heavy interference fit to prevent core movement under all operating
conditions
- copper or copper alloy
bars (depending on the design requirements) are used to achieve specified
torque and high efficiency
- bars are tightly fitted
in the slots and are permanently locked in the slot by a "swaging"
process, in order to prevent vibrations and broken bars
- bars are brazed to
resistance rings at each end of the rotor
- bar extensions between
the core and resistance ring is banded with a glass tape (which is saturated
with a resin) and oven cured to "rock hard" consistency to prevent
any tooth vibration of the lamination occurring
- rotor is turned to its
proper size to achieve the required air gap
- cooling fans are
mounted on each end of the rotor, some rotors have the cooling fans
integrally cast with the resistance rings
- rotor is dynamically
balanced in two places to very low levels of residual unbalance, the balance
weights are permanently welded in place
- rotors are coated with
a red epoxy insulating varnish or other protective coatings (as per customer
specifications) to prevent corrosion
- all rotors are
"stiff shaft" construction with the critical speed at least 25%
above the running speed
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us: sales@etimotors.com |
