Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-12-03
1987-12-01
Wong, Peter S.
Electrical generator or motor structure
Dynamoelectric
Rotary
188299, 381 71, H02K 524
Patent
active
047106565
ABSTRACT:
A single degree of freedom suspension element exhibiting substantially zero natural frequency of vibration with electronically controllable response comprising the combination of a mechanical spring and an "electromagnetic spring" which axially supports a mass located on a base. The electromagnetic spring includes two identical and symmetrical permanent magnet circuits having adjacent like-polarity poles joined by a permeable magnetic shunt member. The magnet circuits include an air gap between pairs of pole faces and within which prominences of a magnetically permeable armature extend therein and partially short each of the air gaps. An electromagnetic coil is located inwardly of the magnetic shunt between the magnetic circuits and encircles the armature between the prominences. The mechanical spring is coupled to the armature and acts to center the prominences in the air gap. Motion of the armature induces currents in the coil which are velocity dependent and opposed to the motion, yielding a viscous damping effect. Energization of the coil results in a differential magnetic flux in the air gaps, producing differential forces tending to move the armature in a predetermined axial direction.
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patent: 4517505 (1985-05-01), Cunningham
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Rebsch D. L.
Wong Peter S.
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