6
RDD-Series Rotary Direct Drive Bearingless Motor Installation Instructions
Publication RDB-IN002A-EN-P — October 2009
Prolonging Motor Life
Thoughtful design and proper maintenance can increase the life of this motor.
Follow these guidelines to maximize the life of the motor:
• Always provide a drip loop in each cable to carry liquids away from the
connection to the motor.
• If design requirements permit, provide shields that protect the motor
housing, shaft, seals, and their junctions from contamination by foreign
matter or fluids.
• Inspect the motor for damage or wear on a regular basis. If damage or
excessive wear is observed, replace the item.
Preventing Electrical Noise
ElectroMagnetic Interference (EMI), commonly called electrical noise, can reduce
motor performance. Effective techniques to counter EMI include filtering the AC
power, using shielded cables, separating signal cables from power wiring, and
practicing good grounding techniques.
Follow these guidelines to avoid the effects of EMI:
• Isolate the power transformers or install line filters on all AC input power
lines.
• Physically separate signal cables from motor cabling and power wiring.
Do not route signal cables with motor and power wires, or over the vent
openings of servo drives.
• Ground all equipment by using a single-point parallel ground system that
employs ground bus bars or large straps. If necessary, use additional
electrical noise reduction techniques to reduce EMI in noisy environments.
Refer to the System Design for Control of Electrical Noise Reference Manual,
publication
, for additional information on reducing the effects of EMI.
