ROTOR CORE, ROTOR, ROTATING ELECTRIC MACHINE AND METHOD OF DESIGNING A ROTOR CORE

Claims

1. The rotor core used in the internal permanent magnet motor, wherein a plurality of sets of permanent magnets forming magnetic poles are located in the rotor core in the circumferential direction of the rotor core, in this case, a plurality of insertion cavities are formed in the rotor core, which penetrate through the rotor core in the axial direction of the rotor core and into which permanent magnets are inserted, wherein a flux barrier is formed in the rotor core, which is provided corresponding to at least one magnetic pole of the mentioned plurality of magnetic poles and penetrates through the rotor core in the axial direction, wherein said flux barrier includes a front flux barrier and a rear flux barrier provided with corresponding magnetic poles, wherein the insertion cavities include a first insertion cavity into which a permanent magnet is inserted, located closer to the forward rotating side, of the magnetic poles, and a second insertion cavity into which a permanent magnet is inserted, located closer to the backward rotating side, of the magnetic poles, wherein the front flow barrier is provided, relative to the first insertion cavity, on the outside in the radial direction of the rotor core and on the forward rotating side and is connected to the first insertion cavity, wherein the rear flow barrier is provided, relative to the second insertion cavity, on the outside in the radial direction of the rotor core and on the rearward rotating side and is connected to the second insertion cavity, wherein the rotor core includes a front bridge provided between the outer circumferential surface of the rotor core and the front flow barrier, and a rear bridge provided between the outer circumferential surface of the rotor core and the rear flow barrier, wherein the relative location of the central location θr of the rear bridge with respect to the rear reference location θsr of the rear flow barrier is located rotationally backward relative to the relative location of the central location θf of the front bridge with respect to the front reference location θsf of the front flow barrier, and in this case, the width Wf of the front crossbar differs from the width Wr of the rear crossbar.

2. The rotor core according to item 1, wherein the width Wr of the rear bridge is greater than the width Wf of the front bridge.

3. A rotor containing a rotor core according to claim 1 or 2; a plurality of sets of permanent magnets built into the rotor core, forming a magnetic pole and located in the rotor core in the circumferential direction of the rotor core.

4. A rotating electric machine comprising a ring stator; and a rotor according to claim 3, located in the stator.

5. The rotating electric machine according to claim 4, wherein, when the central angle θs per stator slot is θs=2π / Nslot [rad] (where Nslot is the number of stator slots), the central location θr of the rear bridge is within a first range specified using the central angle θs relative to the rear reference location θsr of the rear flow barrier, the central location θf of the forward bulkhead is within a second range specified using the central angle θs relative to the forward reference location θsf of the forward flow barrier, and The first and second ranges differ according to the width Wf of the front crossbar and the width Wr of the rear crossbar.

6. The rotating electric machine according to claim 5, wherein, when the width Wf of the front bridge is from θs / 8 to 5θs / 24, and the width Wr of the rear bridge is from 7θs / 24 to 3θs / 8, the first range is from -θs / 6 to -θs / 8, and the second range is from -θs / 24 to θs / 24, or the first range is from -θs / 8 to -θs / 12, and the second range is from -θs / 24 to θs / 12.

7. The rotating electric machine according to claim 5, wherein when the width Wf of the front bridge is from θs / 8 to 5θs / 24, and the width Wr of the rear bridge is from 3θs / 8 to 11θs / 24, the first range is from -θs / 8 to -θs / 24, and the second range is from -θs / 24 to θs / 12.

8. The rotating electric machine according to claim 5, wherein, when the width Wf of the front jumper is from 5θs / 24 to 7θs / 24, and the width Wr of the rear jumper is from 7θs / 24 to 3θs / 8, the first range is from -θs / 6 to -θs / 8, and the second range is from -θs / 24 to θs / 12, the first range is from -θs / 8 to -θs / 12, and the second range is from 0 to 5θs / 24, or the first range is from -θs / 12 to -θs / 24, and the second range is from θs / 24 to 5θs / 24.

9. The rotating electric machine according to claim 5, wherein, when the width Wf of the front jumper is from 5θs / 24 to 7θs / 24, and the width Wr of the rear jumper is from 3θs / 8 to 11θs / 24, the first range is from -θs / 6 to -θs / 8, and the second range is from -θs / 12 to 0, the first range is from -θs / 8 to -θs / 12, and the second range is from -θs / 12 to θs / 24, or the first range is from -θs / 12 to θs / 24, and the second range is from -θs / 24 to θs / 8.

10. A method for designing a rotor core according to claim 1 or 2, comprising the step of designing a position and shape with respect to a forward flux barrier and a rear flux barrier based on a magnetic flux in a magnetic pole.

11. The method of designing a rotor core according to claim 10, in which, at said step, the position and shape of the front and rear flux barriers are designed in such a way that when the torque becomes minimum, the rear flux barrier blocks the magnetic flux path in front of the tooth located closest to the rear flux barrier, and the front flux barrier does not block the magnetic flux oriented from the backward rotating side to the tooth located closest to the front flux barrier, and, when the torque becomes maximum, the rear flux barrier blocks the magnetic flux path entering the tooth located closest to the rear flux barrier from the backward rotating side, and the front flux barrier does not block the magnetic flux path in front of the tooth located closest to the front flux barrier, expanding the magnetic flux path in front of the tooth.