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"Another technique for reducing stray
magnetic fields from a transformer is the use of a
conductive “flux strap” (also sometimes called a
“belly band”, “flux band”, or “hum strap”). This
copper band, illustrated in Fig. 27, provides a
path for the eddy currents that result from the
leakage inductance magnetic dipole. The current
flowing in the flux strap then creates an opposing
magnetic dipole which tends to cancel the
original field at close proximity to the
transformer."
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