Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-01-27
1993-06-01
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
318615, 32420723, H02K 709
Patent
active
052163083
ABSTRACT:
A magnetic bearing structure utilizes two adjacent electromagnetic bearings to provide controlled radial, thrust and moment load support of a shaft relative to a housing. The first bearing generates a high density controllable magnetic field to radially flux couple the shaft to the housing. A second bearing generates a high density controllable magnetic field to axially flux couple the shaft to the housing. In a preferred form, the first bearing circumferentially surrounds the shaft and includes a stator ring associated with the housing which holds several electromagnetic coils radially spaced from the shaft. Power supplied to the coils generates a radially polarized electromagnetic field surrounding the shaft. A pair of additional electromagnetic coils, or permanent magnets, circumferentially extend around the shaft to generate an axially polarized, constant flux magnetic field. Substantially all of the magnetic flux generated by both flux generation sources is directed radially through a primary air gap between the shaft and the stator ring to provide radial support for the shaft. The second bearing includes two coil housings between which a thrust disc associated with the shaft extends. Two arcuate permanent magnets within the disc generate a constant flux radially polarized magnetic field. Three pairs of electromagnetic coils, each subtending a 120 degree arc, are placed within the coil housings to generate an axially polarized, controllable magnetic field. Magnetic flux generated by the permanent magnets and the paired electromagnetic coils axially couples the shaft to the housing.
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Avcon-Advanced Controls Technology, Inc.
Skudy R.
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