Assertion: coil relay | /r/HasAspect | shading ring
Facets:
value: in order to cause a magnetic field
type: PURPOSE
value: typically
type: DEGREE
Source sentences:
text: They also typically have a shading ring that acts as a shorted turn in order to cause a magnetic field 90° out of phase with that from the coil, so that the total magnitude of flux does not drop to zero at the zero crossings.