| 摘要 |
A magnetic device (2) containing a soft magnetic yoke member (3) in its magnetic circuit. The yoke member carries a magnetic flux ( PHI ) produced by a magnetic-field-generating device (7,8) and generates a magnetic stray field (Hs). To reduce this stray field, the present invention surrounds a section (3c) of the yoke member (3) by a compensating-field winding (13), which is electrically excited so that, in addition to the flux ( PHI ) produced by the device (7,8) in the yoke member (3), a supplemental flux ( PHI ') of such magnitude is created that the magnetic dipole moment of the yoke member (3) that produces the stray field (Hs) is at least partially compensated for.
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