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US 6,365,996 B2Granted
Radial active magnetic bearing apparatus and a method for operating the same
AssigneeLust Antriebstechnik GmbH
InventorReto Schöb
Life of this patent
Estimating the term…
Abstract
A radial, active magnetic bearing apparatus comprising at least three electromagnets which are distributedly arranged is excited by a three-phase rotary current controller.
Claims9
A radial, active magnetic Maxwell-bearing apparatus comprising at least three electromagnets which are distributedly arranged, wherein said apparatus further comprises:
- a three-phase rotary current controller for supplying a current to the electromagnets;
- a position sensor for measuring the position of the rotor in two radial directions;
- and
- a programmable microprocessor, wherein the microprocessor stores a desired value of the position of the rotor in two directions, calculates control deviations in two directions, calculates desired current values for the three-phase rotary current controller by a two- to three-phase transformation, and provides the calculated current values to the three-phase rotary current controller so that the electromagnets are supplied with current in such a manner that the position of the rotor corresponds to the desired value stored, and
- wherein the current supplied to each electromagnet is dependent upon the current supplied to the other electromagnets.
2 more elements
A method of operation of a magnetic Maxwell-bearing apparatus, the method comprising:
- providing a magnetic Maxwell-bearing apparatus comprising at least three electromagnets which are distributedly arranged, wherein a three-phase rotary current controller is provided for supplying a current to the electromagnets, wherein the current supplied to each electromagnet is dependent on the current supplied to the other electromagnets;
- predetermining a position of the rotor in an x-direction and in a y-direction by a desired value;
- measuring a position of the rotor by a position sensor in a x-direction and a y-direction;
- calculating control deviations in the x-direction and in the y-direction;
- calculating desired current values by a two- to three-phase transformation for a three-phase rotary current controller;
- and
- providing the calculated desired current values to the three-phase rotary current controller so that the coils of the electromagnets are supplied with current in such a manner that the position of the rotor corresponds to the predetermined desired value.
4 more elements
Dependencies are inferred from the claim text.