초록 ▼

An exemplary permanent-magnet synchronous machine is disclosed with a stator and a rotor located at the distance of the air gap (δ1) from the stator. The rotor is supported on the shaft in a rotating arrangement, and a maximum value has been determined for the eccentricity between the stator and the

An exemplary permanent-magnet synchronous machine is disclosed with a stator and a rotor located at the distance of the air gap (δ1) from the stator. The rotor is supported on the shaft in a rotating arrangement, and a maximum value has been determined for the eccentricity between the stator and the rotor. The value is higher than one-tenth of the air gap. The magnetization of the synchronous machine is arranged with permanent magnets fitted in the rotor for creating a magnetic flux (φ) which is closed via the stator, the air gap (δ1), and the rotor. A relation H≧(10*ε−δ)*μr applies between the thickness of the permanent magnet and the maximum value of eccentricity ε, wherein δ is the dimensioning value of the air gap and μr is the relative permeability of the permanent magnet.

대표청구항 ▼

1. A permanent-magnet synchronous machine, comprising: a stator; anda rotor located at a distance of an air gap (δ1) from the stator, which rotor is supported in a rotating arrangement on a shaft, whereby a maximum value has been specified for eccentricity between the stator and the rotor, which max

1. A permanent-magnet synchronous machine, comprising: a stator; anda rotor located at a distance of an air gap (δ1) from the stator, which rotor is supported in a rotating arrangement on a shaft, whereby a maximum value has been specified for eccentricity between the stator and the rotor, which maximum value is higher than one-tenth of the air gap, whereby magnetization of the synchronous machine is arranged with permanent magnets fitted in the rotor, which are of thickness H in a direction of a magnetic flux and which are used for creating the magnetic flux (φ) which is closed via the stator, the air gap (δ1) and the rotor, wherein between the permanent magnet's thickness H and the maximum value of eccentricity ε it applies a formula: H≧(10*ε−δ)*μr, where δ is a dimensioning value of the air gap, and μr is relative permeability of the permanent magnet. 2. A synchronous machine according to claim 1, wherein the maximum value of eccentricity ε is half of the air gap (δ1). 3. A synchronous machine according to claim 2, wherein the permanent magnet's relative permeability μr is less than 3.5 and the permanent magnet's thickness (H) is at most ten times the dimensioning value of the air gap. 4. A synchronous machine according to claim 3, wherein the maximum value of eccentricity ε is half of the dimensioning value of the air gap, the permanent magnet's relative permeability μr is approximately 1, and the permanent magnet's thickness is higher than the air gap's dimensioning value multiplied with a factor of 3. 5. A synchronous machine according to claim 4 wherein the rotor's eccentricity ranges between 0.2 times the air gap's dimensioning value, and 0.5 times the air gap's dimensioning value. 6. A synchronous machine according to claim 5, wherein the rotor of the synchronous machine is supported onto a shaft of a driving machine connected to it. 7. A synchronous machine according to claim 6, wherein the permanent magnets are fitted on an outer surface of the rotor. 8. A synchronous machine according claim 7, wherein the permanent magnets are fitted in a V shape in the rotor. 9. A synchronous machine according claim 6, wherein the permanent magnets are embedded inside a magnetically conductive core of the rotor. 10. A synchronous machine according claim 9, wherein the permanent magnets are fitted in a V shape in the rotor. 11. A synchronous machine according to claim 1, wherein the permanent magnet's relative permeability μr is less than 3.5 and the permanent magnet's thickness (H) is at most ten times the dimensioning value of the air gap. 12. A synchronous machine according to claim 1, wherein the maximum value of eccentricity ε is half of the dimensioning value of the air gap, the permanent magnet's relative permeability μr is approximately 1, and the permanent magnet's thickness is higher than the air gaps's dimensioning value multiplied with a factor of 3. 13. A synchronous machine according to claim 1, wherein the rotor's eccentricity ranges between 0.2 times the air gap's dimensioning value, and 0.5 times the air gap's dimensioning value. 14. A synchronous machine according to claim 1, wherein the rotor of the synchronous machine is supported onto a shaft of a driving machine connected to it. 15. A synchronous machine according to claim 1, wherein the permanent magnets are fitted on an outer surface of the rotor. 16. A synchronous machine according to claim 1, wherein the permanent magnets are embedded inside a magnetically conductive core of the rotor. 17. A synchronous machine according claim 16, wherein the permanent magnets are fitted in a V shape in the rotor. 18. A method for manufacturing and installing a permanent-magnet synchronous machine having a stator and a rotor supported in a rotating arrangement at a distance of an air gap (δ1) from the stator, comprising: installing the rotor eccentrically in relation to the stator so that its largest allowed eccentricity is at least one-tenth of the air gap, the rotor having permanent magnets with a thickness of H in a direction of a magnetic flux; andmanufacturing and installing the rotor so that between the permanent magnet's thickness H, the rotor's highest allowed eccentricity ε and the air gap's dimensioning value δ a formula is applied as follows: H≧(10*ε−δ)*μr, where μr is relative permeability of the permanent magnet. 19. A method according to claim 18, comprising: manufacturing a rotor support in relation to the stator with such a tolerance that the rotor's highest allowed eccentricity ranges between 0.2 times the dimensioning value of the air gap and 0.5 times the dimensioning value of the air gap.