Motor rotor, self-starting synchronous reluctance motor and compressor

Abstract

A motor rotor, a self-starting synchronous reluctance motor, and a compressor are provided. The motor rotor includes a rotor core, the rotor core includes a first rotor punching plate (1), the first rotor punching plate (1) is provided with a fill groove and a rotor groove (2), the fill groove includes a second fill groove (32) and a first fill groove (31), the first rotor punching plate (1) is provided with a plurality of magnetic barrier layers spaced apart along the q axis, the plurality of magnetic barrier layers includes two outer magnetic barrier layers and a plurality of inner magnetic barrier layers located between the two outer magnetic barrier layers, the outer magnetic barrier layers include a first fill groove (31), the inner magnetic barrier layers include a rotor groove (2) and a second fill groove (32) located at both ends of the rotor groove (2), and the inner magnetic barrier layers of the same layer have a dividing rib (5) between the second fill groove (32) and the rotor groove (2).

Claims

1. A motor rotor, comprising a rotor core, the rotor core comprising a first rotor punching plate (1), the first rotor punching plate (1) having a filling groove and a rotor groove (2), the filling groove comprising a second filling groove (32) and a first filling groove (31), the first rotor punching plate (1) having a plurality of magnetic barrier layers spaced apart along a q-axis, the plurality of magnetic barrier layers comprising two outer magnetic barrier layers and a plurality of inner magnetic barrier layers positioned between the two outer magnetic barrier layers, the outer magnetic barrier layers comprising a first filling groove (31), the inner magnetic barrier layers comprising a rotor groove (2) and a rotor groove (2) at both ends of the rotor groove (2). a second filling groove (32) located in an inner magnetic barrier layer of the same layer, a dividing rib (5) between the second filling groove (32) and the rotor groove (2), a center point being located on an axial plane on which the side edge of the dividing rib (5) closer to the outer circle of the rotor is located, a distance in the d-axis direction between two of said center points corresponding to two dividing ribs (5) in any two adjacent magnetic barrier layers is L, a maximum distance in the q-axis direction of a magnetic conductive channel formed between the filling grooves in the two adjacent magnetic barrier layers is W, and 0≦L<2W is satisfied.

2. 2. The motor rotor of claim 1, wherein 0≦L<W.

3. 3. The motor rotor of claim 2, wherein 0≦L≦0.8W.

4. 2. The motor rotor according to claim 1, characterized in that the width in the d-axis direction of the dividing rib (5) in the inner magnetic barrier layer adjacent to the first filling groove (31) is L1, the first rotor punching plate (1) has an axial hole (4), the width in the d-axis direction of the dividing rib (5) in the inner magnetic barrier layer adjacent to the axial hole (4) is L2, L1 is equal to or greater than L2, and L1 ≧ 0.5 * σ.

5. A motor rotor as described in claim 1, characterized in that the center point is located on an axial plane where the side edge of the dividing rib (5) closer to the outer circle of the rotor is located, the distance in the d-axis direction between the two center points corresponding to the dividing rib (5) of the outermost magnetic barrier layer closer to the outer circle side of the rotor and the dividing rib (5) of the adjacent magnetic barrier layer is k7, the distance in the d-axis direction between the two center points corresponding to the dividing rib (5) of the outermost magnetic barrier layer closer to the outer circle side of the rotor and the dividing rib (5) of the innermost magnetic barrier layer closer to the axial hole side of the rotor is k8, and 0≦k7 / k8≦0.

6.

6. The motor rotor of claim 1, characterized in that the filling groove is located on the outer periphery of the rotor, the distance between the second filling groove (32) in the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the rotor is L3, the distance between the first filling groove (31) in the outermost magnetic barrier layer close to the outer circle side of the rotor and the outer circle of the rotor is L4, L4≧L3 and 0≦L3≦2.5σ, and / or the maximum width in the q-axis direction of the end of the filling groove close to the outer circle side of the rotor is less than or equal to the maximum width in the q-axis direction of the region of the filling groove close to the q-axis of the rotor.

7. 7. The motor rotor according to claim 6, characterized in that the width deviation of the filling groove in the q-axis direction from the outer circle side of the rotor to the q-axis of the rotor is 5% or less, and / or the ratio of the maximum width to the minimum width of the filling groove in the q-axis direction is τ, where 1≦τ≦2.

8. 2. The motor rotor according to claim 1, characterized in that the maximum width in the d-axis direction of the second filling grooves (32) in each inner magnetic barrier layer gradually increases along a direction from the outer circle of the rotor on the q-axis toward the center of the axial hole (4).

9. A motor rotor as described in claim 8, characterized in that the maximum width of each second filling groove (32) in the d-axis direction increases continuously for at least three layers along the direction from the outer circle of the rotor on the q-axis toward the center of the axial hole (4), and / or the maximum width of each second filling groove (32) in the d-axis direction decreases continuously from the second inner magnetic barrier layer close to the d-axis to the magnetic barrier layer closer to the outer circle of the rotor along the direction from the center of the axial hole (4) on the q-axis toward the outer circle of the rotor.

10. The motor rotor according to claim 1, characterized in that the rotor groove (2) is composed of an arc portion and / or a straight portion, the radius of curvature of the arc portion of the rotor groove (2) gradually increases from the axial hole side to the outer circle side of the rotor, and the radius of curvature of the outer arc of the rotor groove of the same layer is larger than the radius of curvature of the inner arc, the arc portion protrudes from the axial hole toward the outer circle of the rotor, or both ends of the rotor groove (2) extend toward the outer circle of the rotor in a direction parallel to the d axis to form straight portions, some or all of both ends of the rotor groove (2) are parallel to the d axis, and the width of the rotor groove (2) gradually increases from the center position of the rotor groove (2) to both ends.

11. 11. The motor rotor according to claim 10, characterized in that along the direction from the center of the axial hole (4) of the q-axis toward the outer circle of the rotor, the width of the rotor groove (2) in the q-axis direction becomes smaller in at least three consecutive layers, the width of the rotor groove (2) in the q-axis direction is m2, the width of the first filling groove (31) in the q-axis direction is m1, the sum of the widths of all the rotor grooves (2) and the first filling groove (31) in the q-axis direction is (m1 + Σm2), the width from the hole wall of the axial hole (4) to the outer circle of the first rotor punching plate is m3, and (m1 + Σm2) / m3 = 0.2 to 0.

5.

12. The motor rotor according to claim 1, characterized in that the filling grooves in the first rotor punching plate (1) have at least five kinds of filling grooves with different filling areas, and / or the total filling area of ​​the first filling groove (31) and the second filling groove (32) accounts for 30% to 70% of the total cross-sectional area of ​​the first filling groove (31), the second filling groove (32) and the rotor groove (2).

13. 2. The motor rotor of claim 1, wherein a minimum width of a magnetic conductive channel between two adjacent filled grooves in two adjacent magnetic barrier layers is W1, W1≧d, and d is a minimum width of a magnetic conductive channel between rotor grooves in two adjacent magnetic barrier layers.

14. 14. The motor rotor of claim 13, wherein W1 / d>1.

15.

15. The motor rotor of claim 1, characterized in that the minimum distance in the q-axis direction of the magnetic conductive channel between two adjacent rotor grooves (2) in two adjacent magnetic barrier layers is h1, h1≧1.5h2, and h2 is the minimum width in the q-axis direction of the magnetic barrier layer that has a smaller width in the q-axis direction of the rotor groove (2) among the two adjacent magnetic barrier layers, and / or the width in the d-axis direction of the first filling groove (31) is smaller than the width in the d-axis direction between the ends of two second filling grooves (32) in the magnetic barrier layer adjacent to it that are closer to the rotor groove (2).

16. The motor rotor of claim 1, characterized in that the ratio of the distance L5 from the inner wall of the first filling groove (31) to the center of the rotor in the q-axis direction to the radius Rr of the rotor satisfies 0.82≦L5 / Rr≦0.96, and / or the ratio of the distance in the q-axis direction of the side edge close to the axial hole side of the innermost two magnetic barrier layers close to the axial hole side to the width of the rotation shaft in the q-axis direction is greater than 1.2, and / or the ratio of the diameter of the arc portion of the side edge close to the axial hole side of the innermost magnetic barrier layer close to the axial hole side to the width of the rotation shaft in the q-axis direction is greater than 2.

17. 2. The motor rotor according to claim 1, characterized in that the first filling groove (31) has a maximum thickness in the q-axis direction k, the second filling groove (32) in the magnetic barrier layer adjacent thereto has a maximum thickness in the q-axis direction k1, and the magnetic conductive channel connected thereto has a minimum thickness in the q-axis direction k2, wherein 1<k / k1≦2 and / or 0.8<k / k2≦1.

6.

18. 2. The motor rotor according to claim 1, wherein a magnetic conductive channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conductive channel in the q-axis direction gradually decreases along a direction from the center of the q-axis axial hole (4) toward the outer circle of the rotor.

19. 19. The motor rotor according to claim 18, characterized in that the width of each magnetic conductive channel in the q-axis direction decreases for at least three consecutive layers along the direction from the center of the axial hole (4) of the q-axis toward the outer circle of the rotor, and / or the magnetic conductive channel is formed between two adjacent magnetic barrier layers, and the width of the magnetic conductive channel gradually increases from the q-axis to both sides of the q-axis for a magnetic conductive channel consisting of an arc portion and a straight portion.

20. 2. The motor rotor of claim 1, wherein in each magnetic barrier layer, the ratio of the width of the rotor groove (2) in the q-axis direction to the width of the end of the rotor groove (2) close to the filling groove is τ1, and τ1 gradually increases from the innermost magnetic barrier layer to the outermost magnetic barrier layer.

21. 2. The motor rotor according to claim 1, wherein in each magnetic barrier layer, the ratio of the maximum width of the filling groove in the q-axis direction to the width of the rotor groove (2) in the q-axis direction is τ2, and τ2>1.

4.

22. The motor rotor of claim 1, characterized in that in the magnetic barrier layer of the outer layer close to the outer circle side of the rotor, the width in the d-axis direction between the ends of the two second filling grooves (32) located at both ends of the rotor groove (2) close to the rotor groove (2) is k3, and in the magnetic barrier layer of the inner layer adjacent thereto and close to the shaft hole side, the width in the d-axis direction between the ends of the two second filling grooves (32) located at both ends of the rotor groove (2) close to the rotor groove (2) is k4, wherein 0.5≦k3 / k4≦1, or 0.5≦k4 / k3≦1.

23. The motor rotor of claim 1, characterized in that the width in the d-axis direction between the ends of the two second filling grooves (31) at both ends of the outermost layer rotor groove (2) close to the rotor groove (2) is k5, and the width in the d-axis direction between the ends of the two second filling grooves (32) at both ends of the innermost layer rotor groove (2) close to the rotor shaft hole side is k6, wherein 0.5≦k5 / k6≦1, or 0.5≦k6 / k5≦1.

24. 2. The motor rotor according to claim 1, characterized in that the included angle between the lines connecting both ends of the first filling groove (31) and the center of the rotor is α1, and 20°≦α1≦60°, and / or the number of the first filling grooves (31) is n, and n≧1, and / or the deviation in parallelism between the longitudinal extension direction of the filling groove and the d-axis is 5% or less.

25. 2. The motor rotor according to claim 1, characterized in that the maximum width of the axial hole (4) of the first rotor punching plate in the q-axis direction is equal to or less than the maximum width of the axial hole (4) in the d-axis direction, and / or the axial hole (4) is composed of a circular arc portion and / or a straight portion.

26. 2. The motor rotor according to claim 1, wherein the rotor core further includes a second rotor punching plate (10), the second rotor punching plate (10) being disposed between the end ring (12) and the first rotor punching plate (1), and the second rotor punching plate (10) is provided with a communicating groove (11) corresponding to the filling groove.

27. 27. The motor rotor according to claim 26, characterized in that the maximum width of the outer contour of the second rotor punching plate (10) is equal to or smaller than the outer diameter of the first rotor punching plate (1), the maximum width of the inner hole of the second rotor punching plate (10) in the q-axis direction is equal to or larger than the maximum width of the inner hole in the d-axis direction, and / or the axial thickness of the second rotor punching plate (10) is equal to or larger than the thickness of one of the first rotor punching plates (1).

28. The motor rotor according to claim 27, characterized in that the ratio of the maximum width in the q-axis direction of the inner hole of the second rotor punching plate (10) to the maximum width in the d-axis direction is 1 to 1.5, and / or the radial width between the inner hole of the second rotor punching plate (10) and its outer circle is smallest in the q-axis direction, and the radial width kd2 of the second rotor punching plate (10) in the d-axis direction and its radial width kq2 in the q-axis direction satisfy 1.1≦kd2 / kq2≦2.

8.

29. 29. The motor rotor of claim 28, wherein 1.2≦kd2 / kq2≦1.

8.

30. 27. Motor rotor according to claim 26, characterized in that the total cross-sectional area of ​​the communicating grooves (11) in the second rotor punching plate (10) is equal to or less than the total cross-sectional area of ​​the filling grooves in the first rotor punching plate (1).

31. 31. A motor rotor according to claim 30, characterized in that the communicating grooves (11) provided in the second rotor punching plate (10) are located at the same position as the filling grooves provided in the first rotor punching plate (1), and the cross-sectional area of ​​a single communicating groove (11) in the second rotor punching plate (10) is equal to or less than the cross-sectional area of ​​a single filling groove in the first rotor punching plate (1) located at the same position.

32. The motor rotor according to claim 26, characterized in that the width in the d-axis direction between the inner hole of the second rotor punching plate (10) and the communicating groove (11) is greater than the width in the d-axis direction of the dividing rib (5) between the communicating groove (11) and the corresponding rotor groove (2).

33. 27. The motor rotor according to claim 26, characterized in that the total cross-sectional area of ​​the rotor grooves (2) in the first rotor punching plate (1) located on the inner peripheral side of the inner hole of the second rotor punching plate (10) accounts for at least 20% of the total flow area of ​​the flow grooves of the motor, and / or the total cross-sectional area of ​​the rotor grooves (2) in the first rotor punching plate (1) located in the inner hole of the second rotor punching plate (10) accounts for at least 30% of the total cross-sectional area of ​​the rotor grooves (2).

34. The motor rotor according to claim 33, characterized in that the total cross-sectional area of ​​the rotor grooves (2) in the first rotor punching plate (1) located on the inner peripheral side of the inner hole of the second rotor punching plate (10) accounts for 25% to 40% of the total flow area of ​​the flow grooves of the motor, and / or the total cross-sectional area of ​​the rotor grooves (2) in the first rotor punching plate (1) located within the inner hole of the second rotor punching plate (10) accounts for 45% to 65% of the total cross-sectional area of ​​the rotor grooves (2).

35. 27. The motor rotor according to claim 26, characterized in that the cross-sectional area of ​​the rotor groove (2) of each layer of the magnetic barrier layer in the first rotor punching plate (1) located on the inner peripheral side of the inner hole of the second rotor punching plate (10) gradually decreases along the direction from the center of the rotor axial hole (4) toward the outer circle of the rotor.

36. 27. The motor rotor according to claim 26, characterized in that the maximum width of the outer contour of the end ring (12) is equal to or smaller than the maximum width of the outer contour of the second rotor punching plate (10), the maximum distance from the center of the rotor axial hole (4) to the end face of the end ring (12) is equal to or larger than the maximum distance from the center of the rotor axial hole (4) to the end face of the second rotor punching plate (10), and / or the radial width in the d-axis direction between the inner hole and the outer circle of the end ring (12) is k9 and the radial width in the q-axis direction is k10, with 1.1≦k9 / k10≦2.

8.

37. 37. The motor rotor of claim 36, wherein 1.2≦k9 / k10≦1.

8.

38. 27. The motor rotor of claim 26, characterized in that the end ring (12) is fitted with a balance block, the balance block being located on the larger radial width side between the inner hole and the outer circle of the end ring (12).

39. 2. The motor rotor according to claim 1, characterized in that at least a part of the filling grooves is filled with a conductive non-magnetic material, and a short circuit is realized via end rings (12) at both ends of the second rotor punching plate (10) to form a cage; and / or the d-axis and the q-axis equally divide the first rotor punching plate (1) from the center of the axial hole (4) into four quadrants, and in the first quadrant, the minimum distance from the geometric center of the dividing rib (5) to the d-axis is kd1 and the minimum distance from the geometric center of the dividing rib (5) to the q-axis is kq1, where kq1=-ν*kd1+λ, 0.28≦ν≦0.46, 28≦λ≦33.

40. A self-starting synchronous reluctance motor comprising a stator and a motor rotor according to any one of claims 1 to 39.

41. 41. The self-starting synchronous reluctance motor of claim 40, wherein the width of the air gap formed between the rotor core and the stator is σ, and 0≦L<8σ.

42. 42. The self-starting synchronous reluctance motor of claim 41, wherein 0≦L≦6σ.

43. The motor rotor according to claim 40, characterized in that, from the axial hole side to the outer circle side of the rotor, the length of the curve between the ends close to the two second filling grooves (32) of the rotor grooves (2) of each layer gradually decreases, and the decrease rate of the length of the curve of adjacent rotor grooves (2) is 5% to 25%, and / or the dividing rib (5) has a minimum width L2 in the d-axis direction, L2≧0.5*σ, and σ is the width of the air gap formed between the rotor core and the stator.

44. 41. A compressor comprising the self-starting synchronous reluctance motor of claim 40.

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