Magnetic bearing device and magnetic bearing control device

A magnetic bearing control device for controlling a magnetic bearing device which magnetically levitates a rotary shaft without coming in contact therewith, comprising:

• model type identifying means for identifying a model type of the magnetic bearing device from among different model types;
• first memory means for storing characteristic values of the magnetic bearing device corresponding to the model type;
• connecting means for accessing the model type identifying means and for the first memory means;
• second memory means which is rewritable for storing the model type of the magnetic bearing device and characteristic values of the magnetic bearing device;
• obtaining means for obtaining the model type from the model type identifying means through the connecting means and obtaining the characteristic values of the magnetic bearing device from the first memory means through the connecting means;
• renewal means for renewing contents of the second memory means with contents of the first memory means if the model type and the characteristic values obtained by the obtaining means differ from the model type and the characteristic values stored in the second memory means;
• and
• a controlling section for controlling the magnetic bearing device in accordance with the characteristic values stored in the second memory means.

A magnetic bearing control device for controlling a magnetic bearing device which magnetically levitates a rotary shaft without coming into contact therewith, comprising:

• model type identifying means for identifying a model type of the magnetic bearing device from among different model types;
• first memory means for storing characteristic values of the magnetic bearing device corresponding to the model type;
• connecting means for accessing the model type identifying means and the first memory means;
• second memory means which is rewritable for storing the model type of the magnetic bearing device and characteristic values of the magnetic bearing device;
• obtaining means for obtaining the model type from the model type identifying means through the connecting means and obtaining the characteristic values of the magnetic bearing device from the first memory means through the connecting means;
• judgment means for judging whether or not contents of the first memory means and the second memory means are normal;
• renewal means for renewing contents of one of the first and second memory means with contents of the other memory means when the judgment means judges that contents of the one memory means are abnormal and the contents of the other memory means are normal;
• and
• a controlling section for controlling the magnetic bearing device in accordance with the characteristic values stored in the second memory means.

A magnetic bearing control device for controlling a magnetic bearing device which magnetically levitates a rotary shaft without coming into contact therewith, comprising:

• model type identifying means for identifying a model type of the magnetic bearing device from among different model types;
• first memory means for storing characteristic values of the magnetic bearing device corresponding to the model type;
• connecting means for accessing the model type identifying means and the first memory means;
• second memory means which is rewritable for storing the model type of the magnetic bearing device and characteristic values of the magnetic bearing device;
• obtaining means for obtaining the model type from the model type identifying means through the connecting means and obtaining the characteristic values of the magnetic bearing device from the first memory means through the connecting means;
• judgment means for judging whether or not contents of the first memory means and for the second memory means are abnormal;
• third memory means for storing characteristic values of magnetic bearings of each of the different model types;
• renewal means for reading the characteristic values corresponding to the model type from the third memory means and renewing the contents of the first and second memory means if the judgment means judges that contents of the first memory means and the second memory means are abnormal;
• and
• a controlling section for controlling the magnetic bearing device in accordance with the characteristic values stored in the second memory means.

A vacuum pump, comprising:

• a motor;
• a rotary body rotated by the motor and having a plurality of rotor blades along an axial direction thereof, each rotor blade extending in a radial direction of the rotary body and being rotated by the motor;
• a stator having a plurality of fixed blades confronting the rotor blades with a small gap between confronting blades;
• a casing for containing the motor, the rotary body, the rotor blades, the stator, and the fixed blades, and having a base portion;
• an inlet port for receiving a gas;
• an outlet port for discharging the gas;
• and a magnetic bearing device for magnetically levitating the rotary body, the magnetic bearing device comprising means for magnetically levitating the rotary body without coming into contact therewith, model type identifying means for identifying a model type of the magnetic bearing device from among different model types, first memory means for storing characteristic values of the magnetic bearing device corresponding to the model type, and connecting means for connecting the model type identifying means and the first memory means to an external device during use of the magnetic bearing device to permit the external device to determine the model type of the magnetic bearing device from the model type identifying means, to compare the characteristic values stored in the first memory means with external data corresponding to the model type, and to replace the characteristic values stored in the first memory means with the external data when the comparison result indicates that the characteristic values are erroneous.

A vacuum pump, comprising:

• a motor;
• a rotary body rotated by the motor and having a plurality of rotor blades along an axial direction thereof, each rotor blade extending in a radial direction of the rotary body and being rotated by the motor;
• a stator having a plurality of fixed blades confronting the rotor blades with a small gap between confronting blades;
• a casing for containing the motor, the rotary body, the rotor blades, the stator, and the fixed blades, and having a base portion;
• an inlet port for receiving a gas;
• an outlet port for discharging the gas;
• and a magnetic bearing control device for magnetically levitating the rotary body, the magnetic bearing device comprising model type identifying means for identifying a model type of the magnetic bearing device from among different model types, first memory means for storing characteristic values of the magnetic bearing device corresponding to the model type, connecting means for accessing the model type identifying means and the first memory means, second memory means which is rewritable for storing the model type of the magnetic bearing device and characteristic values of the magnetic bearing device, obtaining means for obtaining the model type from the model type identifying means through the connecting means and obtaining the characteristic values of the magnetic bearing device from the first memory means through the connecting means, renewal means for renewing contents of the second memory means with contents of the first memory means if the model type and the characteristic values obtained by the obtaining means differ from the model type and the characteristic values stored in the second memory means, and a controlling section for controlling the magnetic bearing device in accordance with the characteristic values stored in the second memory means.

A magnetic bearing device comprising:

• electromagnets for magnetically levitating a rotary shaft without coming into contact therewith;
• a model type identifying device from which a model type of the magnetic bearing device can be determined from among different model types;
• a first memory for storing characteristic data of the magnetic bearing device;
• and a connector for enabling a connection to be made to an external controller during use of the magnetic bearing device to permit the external controller to control the electromagnets, to determine the model type of the magnetic bearing device, and to compare the characteristic data with external data to determine if the characteristic data or the external data is erroneous.