Magnetic bearing device stably carrying a rotary shaft, program for executing a computer to control the magnetic bearing stably carrying the rotary shaft and computer-readable record medium storing the program
AssigneeNtn Corporation
InventorKoji Yamada
Life of this patent
Estimating the term…
Abstract
A control device estimate a magnitude of a load applied to a magnetic bearing by processing a current instruction (Iref) issued by itself with a low-pass filter. The control device changes a control model in feedback control of the magnetic bearing in accordance with the estimated magnitude of the load, and calculates a control parameter such as a gain in the changed control model. Further, control device sets the calculated control parameter in a feedback controller performing actual feedback control.
Claims25
A magnetic bearing device comprising:
- a rotary shaft carrying a fan rotating at a variable speed in a chamber holding a variable gas pressure;
- a motor rotating said rotary shaft;
- a magnetic bearing holding said rotary shaft;
- and
- a control circuit changing a parameter in feedback control performed for holding said rotary shaft in a position allowing stable rotation of said fan in accordance with a load applied to said magnetic bearing.
A program for executing a computer to perform feedback control on a magnetic bearing such that a rotary shaft carrying a fan rotating at a variable speed in a chamber holding a variable gas pressure is held in a position allowing stable rotation of said fan, said program executing said computer to execute:
- a first step of determining a load applied to said magnetic bearing;
- a second step of changing a parameter in said feedback control in accordance with the determined load;
- and
- a third step of performing said feedback control with said changed parameter.
Dependencies are inferred from the claim text.