
B-65342EN/01 2.SPINDLE DESIGNING AND MOTOR MOUNTING
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2.2 SHRINKING THE ROTOR
2.2.1 Safety Information
• The outline flow for process is shown below.
Rotor, Side ring
Balancing spindle
Assemble into the spindle
Shaft
Shrink fit a rotor
Finish machining
• The way to fix a rotor on the spindle must be shrink fitting.
• Rotor and side rings are finished machining before shipment. Do
not machine rotor and rings.
• "Finish machining" in above means that of bearing part or the
part except motor.
In the machining, cover the rotor with some flexible sheet so that
the rotor not to catch cutting chips on its surface. Furthermore,
cover the rotor in industrial wrap so that the rotor doesn’t get wet
with cutting fluid.
• When shrink fitting a rotor, the actual temperature of the rotor
must be measured directly so that the temperature never to
exceed 150°C. If rotor temperature exceeds 150°C, internal
magnet may be damaged. If you use an electric oven, measure
the distribution of temperature inside of the oven. The rotor is
never exposed to a hot wind directly. Never use the induction
heater.
• Shaft should be cooled to 0°C or less.
• When the rotor is left temporarily for some preparations, the
rotor should be wound by some thick soft non-magnetic material,
such as corrugated cardboard etc., with the thickness of more
than 30mm. And rope off the rotor, call attention that the rotor
has strong magnetic force. to keep away from a person to access
the rotor. Wrap is to prevent the rotor from caching metal chips
on its surface, and soft material or corrugated cardboards is the
buffer material for the safely.