Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-10-20
1997-12-09
Stephen, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
H02K 709
Patent
active
056964129
ABSTRACT:
A sensorless active magnetic bearing suitable for use in rotating machinery and seals, contemplates a circuit and a process for actively controlling the position of an object using magnetic forces without mechanical contact between the object suspended 10 and the components of the magnetic positioner, and without the necessity for discrete sensors for determining the position of the object suspended. Electromagnets L.sub.1 and L.sub.2 are placed in an ordered coaxial array surrounding an object to be suspended, and impart magnetic forces while simultaneously detecting the position of the object in accurate registration with the position of the corresponding electromagnets. In one embodiment constructed according the principles of the present invention, the currents to the electromagnets are controlled by switching amplifiers 20 that switch the amplitudes of the supply voltages applied across the coils of electromagnets L.sub.1, L.sub.2. When two or more electromagnets are placed electrically in series, the absolute magnitude of the voltage developed across a coil indicates its relative inductance. The position of the member along an axis may be detected by comparing the absolute magnitude of the voltage drops of the two electromagnets located on either side of the member being supported and along that axis because the inductance of the electromagnet varies with its distance from the supported member. In another embodiment constructed according these principles, a single electromagnet L.sub.1 is placed electrically in series with a reference coil L.sub.ref and the absolute magnitude of the voltage across the reference coil may be used to detect the position of the member being supported.
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Bushnell Esq. Robert E.
Link Jonathon
Stephen Steven L.
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