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Everest XCR - Product manual | Wiring and Connections
INGENIA | 2020-10-01 00:04:38 44
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9.3.5.2 DC Motor
9.3.5.3 Motor Choke
In applications where electromagnetic compatibility is needed, the use of an external common mode choke is
necessary for the motor phases. Please see this document to understand why this is relevant Electromagnetic
Interference Issues With Servo Drive Systems .
Note that on applications where the drive is mounted inside the motor or actuator the choke and cable shields may
be removed. While the actuator enclosure will provide shielding against radiated EMC, the need or not of common
mode choke will depend on motor construction, especially capacitive coupling between windings and housing as
well as EMC requirements.
Some choke wiring recommendations are:
Place the choke as close to the drive as possible. The objective is to cancel the noise close to its source (the
switching power stage).
Make sure the chosen choke
does not saturate at the maximum operating phase current . If this happens,
the choke temperature would increase rapidly.
Make only 1 or 2 turns of the motor cables. More than 2 reduces its effectiveness as the capacitive coupling
between wires bypasses the choke effect.
PE conductor should never pass through the choke.
Avoid contact of the toroid core with a grounding point.
The next table shows recommended chokes for the Everest XCR.
Type Manufacturer Part number Remarks
Wide frequency oval ferrite cable
core Laird Technology 28B0773-050 Single turn. Preferred option.
Wide frequency cylindrical
ferrite cable core Laird Technology 28B0999-000 Double turn option. Higher
attenuation.
In case of doing 2 turns, space the phases 120º apart. Start each phase wire in the same rotating direction, wrapping
all phases clockwise or anticlockwise. This will add the common-mode flux and increase its impedance.