CN216851461U - Motor rotor and self-starting synchronous reluctance motor and compressor thereof - Google Patents

Abstract

The utility model provides a motor rotor and from starting synchronous reluctance motor thereof, a compressor, motor rotor wherein, including rotor core, last packing groove and the slit groove of having seted up of rotor core, the packing groove includes that the second fills groove and first packing groove, outside magnetic barrier layer includes first packing groove, inboard magnetic barrier layer includes the slit groove and is in the second packing groove at the both ends in slit groove, in the same in situ side magnetic barrier layer, the muscle of cutting apart has between second packing groove and the slit groove, in the first quadrant that d axle and q axle constitute, cut apart the muscle center and satisfy Wq axle for d axle and q axle distance relation and be- ν Wd + λ, wherein Wq is for cutting apart the distance of muscle center to q axle, Wd is for cutting apart the distance of muscle center to d axle, 0.28 ≤ ν is ≤ 0.46, 28 ≤ λ ≤ 33. According to the utility model discloses, inject the position and the width of cutting apart the muscle, can increase the area that the second packing groove bore pressure when filler material for the deformation of rotor in manufacturing process reduces, reduces the technology degree of difficulty.

Description

Motor rotor and self-starting synchronous reluctance motor and compressor thereof

Technical Field

The utility model belongs to the technical field of motor design, concretely relates to electric motor rotor and self-starting synchronous reluctance motor, compressor thereof.

Background

The self-starting synchronous reluctance motor combines the advantages of an asynchronous motor on the basis of the synchronous reluctance motor, realizes self-starting through asynchronous torque generated by a rotor conducting bar, and does not need to be driven by a frequency converter. Compared with an asynchronous motor, the motor can realize constant-speed operation, the loss of a rotor is low, and the efficiency in synchronous operation is improved; compared with an asynchronous starting permanent magnet synchronous motor, the motor does not use permanent magnet materials, is low in cost and does not have the problem of demagnetization of permanent magnets. However, the problem of pressure deformation easily occurs in the manufacturing process of the motor rotor core due to the multi-layer magnetic barrier layer structure of the self-starting synchronous reluctance motor.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides an electric motor rotor and from starting synchronous reluctance motor, compressor thereof can overcome the electric motor rotor of the synchronous reluctance motor that starts among the correlation technique and have the multilayer magnetic barrier layer, leads to producing the not enough of pressure deformation easily in electric motor rotor core manufacturing process.

In order to solve the problems, the utility model provides a motor rotor, including rotor core, the last packing groove and the slit groove of having seted up of rotor core, the packing groove includes second packing groove and first packing groove, rotor core is last to be provided with along its q axle spaced multilayer magnetic barrier layer, multilayer magnetic barrier layer includes two outside magnetic barrier layers and the multilayer is in the inboard magnetic barrier layer between two outside magnetic barrier layers, outside magnetic barrier layer includes first packing groove, inboard magnetic barrier layer includes the slit groove and is in the second packing groove of the both ends in the slit groove, in the same in situ side magnetic barrier layer, second packing groove and slit groove have the segmentation muscle, in the first of d axle and q axle constitution, the segmentation muscle center satisfies Wq ═ Wd + lambda for d axle and q axle distance relation, wherein Wq is for cutting apart the distance of muscle center to q axle, Wd is for cutting apart the distance of muscle center to d axle, nu is more than or equal to 0.28 and less than or equal to 0.46, and lambda is more than or equal to 28 and less than or equal to 33.

In some embodiments, the distance between the side edges of the dividing ribs in the two adjacent magnetic barrier layers, which are close to the outer circle side of the rotor, along the d-axis direction is L, the maximum distance between the magnetic conduction channels formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis direction is W, and L is greater than or equal to 0 and less than 2W.

In some embodiments, 0 ≦ L < W.

In some embodiments, 0 ≦ L ≦ 0.8W.

In some embodiments, the width of the air gap formed between the stator inner diameter and the rotor outer diameter is σ, and 0 ≦ L < 8 σ.

In some embodiments, 0 ≦ L ≦ 6 σ.

In some embodiments, the width of the segmentation rib of the magnetic barrier layer consisting of the outermost slit groove and the second filling groove close to the outer circle side of the rotor along the d-axis direction is L1, the width of the segmentation rib of the innermost magnetic barrier layer close to the shaft hole side along the d-axis direction is L2, L1 is more than or equal to L2, L1 is more than or equal to 0.5 sigma, and sigma is the width of an air gap between the stator and the rotor; and/or the magnetic barrier structure under one rotor pole is symmetrically arranged around the q axis and is radially arranged by more than two layers.

In some embodiments, the minimum width d1 of the magnetic channel between two adjacent second filling grooves is greater than the minimum width d2 of the magnetic channel formed between the slit grooves corresponding to the two second filling grooves, and d1 is greater than or equal to 1.15d 2.

In some embodiments, 1.2d2 ≦ d1 ≦ 1.35d 2.

In some embodiments, the minimum distance d3 along the q-axis direction of two adjacent magnetic barrier layers is d3 ≧ 1.5d4, and d4 is the minimum width along the q-axis direction of the magnetic barrier layer with the smaller width along the q-axis direction.

In some embodiments, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel in the q-axis direction gradually decreases towards the direction away from the d-axis.

In some embodiments, the width of each magnetic conduction channel in the q-axis direction is continuously reduced by at least three layers towards the direction away from the d-axis; and/or a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and for any magnetic conduction channel, the width of the magnetic conduction channel is gradually increased from the q axis to the two sides of the q axis.

In some embodiments, the width along the d-axis direction of the second filling grooves at both ends of the slot groove at the outermost layer near the outer circle of the rotor is L3, the width along the d-axis direction of the second filling grooves at both ends of the slot groove at the side near the shaft hole adjacent thereto is L4, and 0.2 ≦ L3/L4 ≦ 0.9; and/or the width of the second filling groove at two ends of the innermost layer slit groove close to the shaft hole side along the d-axis direction is L5, and L3/L5 is more than or equal to 0.1 and less than or equal to 0.7.

In some embodiments, 0.45 ≦ L3/L4 ≦ 0.65; and/or, L3/L5 is more than or equal to 0.3 and less than or equal to 0.35.

In some embodiments, in the outermost magnetic barrier layer near the outer circumferential side of the rotor, a distance in the d-axis direction between the dividing rib between the slit groove and the filling groove and the dividing rib between the slit groove and the filling groove adjacent to the outermost magnetic barrier layer is L6, a distance in the d-axis direction between the dividing rib between the slit groove and the filling groove of the outermost magnetic barrier layer and the dividing rib between the slit groove and the filling groove of the innermost magnetic barrier layer near the axial hole side of the rotor is L7, and then a ratio of L6 to L7 satisfies 0 ≦ L6/L7 ≦ 0.6.

In some embodiments, 0 ≦ L6/L7 ≦ 0.4.

In some embodiments, 0 ≦ L6/L7 ≦ 0.2.

In some embodiments, the ratio of the width of the slit groove on the q axis to the width of the slit groove near the end of the filling groove in each of the barrier layers is τ 1, and τ 1 gradually increases from the innermost barrier layer to the outermost barrier layer; and/or in each layer of magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slit groove on the q-axis is tau 2, and the tau 2 is more than 1.4.

In some embodiments, 1.5 < τ 2 < 3.0.

In some embodiments, the slit groove consists of arc line segments and/or straight line segments, the arc segments are arranged at intervals along a q axis, the radian of the arc line segments of the slit groove is gradually increased from the axial hole side of the rotor to the excircle side of the rotor, and the radian of the outer arc of the slit groove on the same layer is greater than that of the inner arc of the slit groove on the same layer; alternatively, both ends of the slit groove extend substantially in the d-axis direction, and the width of the slit groove gradually increases from the middle position of the slit groove toward both ends.

In some embodiments, the ends of some or all of the slit grooves are parallel to the d-axis.

In some embodiments, the partial slit grooves are irregularly shaped grooves, and each irregularly shaped groove includes a first straight groove section, an arc groove section, and a second straight groove section connected in sequence, and the first straight groove section and the second straight groove section are both parallel to the d axis, and the arc groove section protrudes toward the side away from the shaft hole.

In some embodiments, when part or all of the slit grooves are arc-shaped grooves, the arc-shaped grooves are arranged avoiding the shaft hole, and the arc-shaped grooves protrude towards one side far away from the shaft hole; and/or the partial slit groove is a linear groove which is arranged in parallel to the d axis and is positioned between the first filling groove and the special-shaped groove.

In some embodiments, from the rotor shaft hole side to the rotor excircle side, the curve length between the end parts of each layer of slit grooves close to the two second filling grooves gradually decreases, and the curve length decreasing proportion of the adjacent slit grooves is 5% -20%; and/or the interval d5 between the filling groove and the outer circle of the rotor meets the condition that d5 is more than or equal to 0.5 sigma, and the sigma is the width of an air gap between the inner diameter of the stator and the outer diameter of the rotor.

In some embodiments, the filling grooves extend at an angle that deviates by no more than 5% from being parallel to the d-axis; and/or the width of the end part of the filling groove close to the outer circle side of the rotor along the q-axis direction is not larger than the width of the end part of the filling groove close to the inner hole side of the rotor along the q-axis direction.

In some embodiments, the width of the filling groove in the q-axis direction deviates by no more than 5% from the outer circumferential side of the rotor to the q-axis of the rotor.

In some embodiments, at least five types of the filling grooves having different filling areas are formed in the rotor core; and/or the total filling area of the first filling groove and the second filling groove accounts for 30-70% of the total area of the first filling groove, the second filling groove and the slit groove.

In some embodiments, the total filling area of the first filling groove and the second filling groove accounts for 35% to 50% of the total area of the first filling groove, the second filling groove and the slit groove.

In some embodiments, the ratio τ between the maximum thickness and the minimum thickness of all filled trenches along the q-axis direction is 1 ≦ τ ≦ 2.

In some embodiments, 1.3 ≦ τ ≦ 1.5.

In some embodiments, the maximum thickness of each second filling groove in the q-axis direction gradually increases toward the d-axis direction.

In some embodiments, the maximum width of each second filling groove in the q-axis direction increases continuously by at least three layers toward the d-axis direction.

In some embodiments, the maximum width of each second filling groove in the q-axis direction decreases continuously in a direction away from the d-axis from the second layer of the magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer circumferential side of the rotor.

In some embodiments, the grooves of the first filling groove and the second filling groove are filled with conductive and non-conductive materials, and the filling grooves are connected in a self-short circuit mode through end rings at two ends of the rotor core to form a squirrel cage structure; and/or the first filling groove is positioned in the q-axis direction of the periphery of the rotor and extends along the direction parallel to the d axis, the first filling groove comprises n q-axis filling grooves, and n is more than or equal to 1.

In some embodiments, ribs are arranged between two adjacent q-axis filling grooves, the number m of the ribs is equal to or more than 3, the ratio of m to the radius Rr of the rotor is equal to or more than 0.07, the sum of the widths of the ribs along the d-axis direction is equal to or more than 0.045, and the ratio of the sum of the widths of the ribs in the d-axis direction is equal to or more than 0.045, and L8 is the width of each rib.

In some embodiments, the width difference between the ribs is within 20%, and the minimum value L9 of the width of each rib should satisfy L9 ≧ σ, σ being the width of the air gap between the stator inner diameter and the rotor outer diameter.

In some embodiments, the included angle between the two ends of the first filling groove and the connecting line of the center of the rotor is alpha 1, and alpha 1 is more than or equal to 20 degrees and less than or equal to 60 degrees.

In some embodiments, 30 ≦ α 1 ≦ 50.

In some embodiments, 30 ≦ α 1 ≦ 35.

In some embodiments, a width of the first filling groove in the d-axis direction is smaller than a width in the d-axis direction between end portions of two second filling grooves in adjacent magnetic barrier layers on a side close to the slit groove.

In some embodiments, the ratio of the distance L10 from the rotor center in the q-axis direction to the rotor radius Rr of the first filling groove satisfies 0.82 ≦ L10/Rr ≦ 0.96; and/or the ratio of the distance of the side edges, close to the shaft hole side, of the two innermost magnetic barrier layers close to the shaft hole side on the q axis to the width of the rotating shaft on the q axis is more than 1.2; and/or the ratio of the diameter of an arc line segment of the side edge of the innermost magnetic barrier layer close to the shaft hole side and close to the shaft hole side to the width of the rotating shaft on the q axis is more than 2; and/or the maximum width of the shaft hole in the q-axis direction is not greater than the maximum width of the shaft hole in the d-axis direction.

The utility model also provides a self-starting synchronous reluctance motor, including foretell electric motor rotor.

The utility model also provides a compressor, including foretell synchronous reluctance motor that starts.

The utility model provides a pair of electric motor rotor and self-starting synchronous reluctance motor, compressor thereof prescribe a limit to and cut apart the position and the width of muscle, can increase the area that the second filled the groove and bear pressure when filling material for the deformation of rotor in manufacturing process reduces, reduces the technology degree of difficulty.

Drawings

Fig. 1 is a schematic structural view (axial direction) of a rotor core of a motor rotor according to an embodiment of the present invention;

fig. 2 is a schematic structural view (axial direction) of a rotor core of a motor rotor according to another embodiment of the present invention;

fig. 3 is a motor efficiency comparison between the motor adopting the technical scheme of the present invention and the prior art.

The reference numerals are represented as:

1. a rotor core; 21. a first filling groove; 22. a second filling groove; 3. a slit groove; 4. a shaft hole; 5. cutting ribs; 6. and (5) ribs.

Detailed Description

Referring to fig. 1 to fig. 3 in combination, according to an embodiment of the present invention, the present invention provides a self-starting synchronous reluctance motor rotor, which includes a rotor core 1 stacked with rotor punching sheets. The utility model discloses a to the second in every layer of magnetic barrier layer fill between groove 22 and the slit groove 3 cut apart the position of muscle 5 and the design of width, can strengthen the mechanical strength of rotor, reduce the pressure deformation of rotor in manufacturing process, can reduce the second simultaneously and fill the magnetic leakage between groove 22 and the slit groove 3, promote motor efficiency.

The utility model discloses in, the multilayer magnetic barrier layer structure of rotor is constituteed to second packing groove 22 and slit groove 3 or first packing groove 21 on rotor core 1. In each magnetic barrier layer structure composed of the second filling groove 22 and the slit groove 3, the dividing rib 5 is arranged between the second filling groove 22 and the slit groove 3. In a first quadrant formed by dq axes, the distance relation between the center of the segmentation rib 5 and a d axis and a q axis of the rotor meets Wq ═ v × Wd + lambda, wherein Wq is the distance between the center of the segmentation rib 5 and the q axis, Wd is the distance between the center of the segmentation rib 5 and the d axis, the coefficient v meets the requirement that v is more than or equal to 0.28 and less than or equal to 0.46 (dimensionless), and the coefficient lambda meets the requirement that lambda is more than or equal to 28 and less than or equal to 33 (the dimension is consistent with Wq and Wd). The segmentation ribs 5 can enhance the mechanical strength of the rotor, reduce the deformation of the rotor in the manufacturing process and reduce the process difficulty. The position and the width of the segmentation rib 5 are limited, so that the area of the second filling groove 22 bearing pressure during filling materials can be increased, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced. Fig. 3 shows that the utility model discloses the technique contrasts with prior art motor efficiency, the utility model discloses the technique can resist the pressure deformation that causes in the rotor manufacturing process, strengthens the mechanical strength of rotor, promotes motor efficiency simultaneously.

In some embodiments, the distance between the side edges of the dividing ribs 5 in two adjacent magnetic barrier layers close to the outer circle side of the rotor along the d-axis direction is L, and the maximum distance between the magnetic conduction channels formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis direction is W, then L should satisfy 0 ≦ L ≦ 2W, more preferably 0 ≦ L ≦ W, and most preferably 0 ≦ L ≦ 0.8W. The minimum distance between the rotor filling grooves is limited, on one hand, the saturation of the magnetic conduction channels between the filling grooves can be reduced, on the other hand, the relative positions of the magnetic conduction channels and the stator teeth can be staggered, so that the harmonic waves of the motor can be reduced, the torque pulsation is reduced, the harmonic loss is reduced, and the efficiency and the running stability of the motor are improved.

In some embodiments, the width of the air gap formed between the stator inner diameter and the rotor outer diameter is σ, then L should satisfy 0 ≦ L ≦ 8 σ, and more preferably 0 ≦ L ≦ 6 σ. The relative distance of the segmentation ribs 5 between each filling groove and the slit groove 3 of the rotor is limited, the area of bearing pressure between two adjacent magnetic barrier layers can be increased, the effect of mutual support is formed, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

In some embodiments, the width of the split rib 5 of the magnetic barrier layer composed of the outermost slit groove 3 and the second filling groove 22 close to the outer circumferential side of the rotor in the d-axis direction is L1, the width of the split rib 5 of the innermost magnetic barrier layer close to the axial hole side in the d-axis direction is L2, L1 is not less than L2, and L1 is not less than 0.5 σ, and σ is the width of the air gap between the stator and the rotor. The minimum width of the segmentation ribs 5 is limited, so that the processing difficulty can be reduced, and the mechanical strength of the rotor is improved; l1 is more than or equal to L2, the magnetic flux leakage of the inner layer magnetic barrier layer can be reduced, and the motor efficiency is improved.

In some embodiments, the plane on which the side of the dividing rib 5 is located is parallel to or intersects with the plane on which the q-axis is located, i.e., the shape of the dividing rib 5 is not limited to being rectangular or quadrangular or arc-shaped.

The utility model discloses in, magnetic barrier layer structure under a rotor utmost point is about q axle symmetric arrangement, and along radially arranging 2 layers and above.

In some embodiments, the minimum width d1 of the magnetic channel between two adjacent second filling grooves 22 is greater than the minimum width d2 of the magnetic channel formed between the slit grooves 3 corresponding to the two second filling grooves 22, and d1 and d2 satisfy d1 ≧ 1.15d2, and more preferably, 1.2d2 ≦ d1 ≦ 1.35d 2. The purpose is to ensure that enough width is left between the filling grooves, and avoid magnetic field saturation from occurring and influencing the magnetic flux circulation of the channels between the magnetic barrier layers.

In some embodiments, the minimum distance d3 along the q-axis direction of two adjacent magnetic barrier layers should satisfy d3 ≧ 1.5d4, and d4 is the minimum width along the q-axis direction of the magnetic barrier layer with the smaller width along the q-axis direction. The minimum distance between adjacent magnetic barrier layers is limited, the processing difficulty of the rotor can be reduced, and the uniformity and the unsaturation degree of the magnetic density distribution of the rotor are ensured.

In some embodiments, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel in the q-axis direction is approximately gradually reduced towards the direction far away from the d-axis; more preferably, the width of each magnetic conduction channel in the q-axis direction is continuously reduced by at least three layers towards the direction far away from the d-axis. And a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and for any magnetic conduction channel, the width of the magnetic conduction channel is gradually increased from the upper part of the q axis to two sides of the q axis (the definition of the width of the magnetic conduction channel is that the shortest distance from each point on one side edge of the two side edges of the magnetic conduction channel to the other side edge). The effect of the magnetic conduction channel and the stator which are closer to the shaft hole 4 is larger, and the influence on the performance of the motor is larger. This setting guarantees to be close to shaft hole side guide magnetic channel width on the basis of rational utilization rotor space, helps promoting motor performance.

In some embodiments, the second filling grooves 22 at both ends of the outermost slit groove 3 near the outer circumference of the rotor have a width L3 in the d-axis direction; the width of the second filling grooves 22 at both ends of the slit groove 3 adjacent thereto on the side close to the shaft hole in the d-axis direction is L4, L3 and L4 should satisfy 0.2. ltoreq. L3/L4. ltoreq.0.9, more preferably, 0.45. ltoreq. L3/L4. ltoreq.0.65. Under the condition of being limited by the rotor space, the arrangement can increase the area of the filling groove and improve the starting capability of the motor.

In some embodiments, the second filling grooves 22 at both ends of the outermost slit groove 3 near the outer circumference of the rotor have a width L3 in the d-axis direction; the width of the second filling grooves 22 at both ends of the innermost slit groove 3 near the shaft hole side in the d-axis direction is L5, L3 and L5 should satisfy 0.1. ltoreq.L 3/L5. ltoreq.0.7, more preferably, 0.3. ltoreq.L 3/L5. ltoreq.0.35. Under the condition of being limited by the rotor space, the arrangement can increase the area of the filling groove and improve the starting capability of the motor.

In some embodiments, in the outermost magnetic barrier layer near the outer circumferential side of the rotor, the distance in the d-axis direction between the dividing rib 5 between the slit groove 3 and the filling groove and the dividing rib 5 between the slit groove 3 and the filling groove adjacent to the outermost magnetic barrier layer is L6; the distance between the dividing rib 5 between the slit groove 3 and the filling groove of the outermost layer magnetic barrier layer and the dividing rib 5 between the slit groove 3 and the filling groove of the innermost layer magnetic barrier layer close to the rotor shaft hole side along the d-axis direction is L7, then the ratio of L6 and L7 satisfies 0L 6/L7 and 0.6, more preferably 0L 6/L7 and 0.4, and most preferably 0L 6/L7 and 0.2. The minimum relative distance and the maximum relative distance of the segmentation ribs 5 between each filling groove and the slit groove 3 of the rotor are limited, the area of bearing pressure between magnetic barrier layers can be increased, the effect of mutual support is formed, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

In some embodiments, the ratio of the width of the slit groove 3 in the q axis to the width of the slit groove 3 near the end of the filling groove in each of the magnetic barrier layers is τ 1, and τ 1 is generally gradually increased from the innermost magnetic barrier layer to the outermost magnetic barrier layer. In each magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slit groove 3 on the q-axis is tau 2, tau 2 is more than 1.4, preferably tau 2 is more than 1.5 and less than 3.0, the width of a magnetic conduction channel between the inner magnetic barrier layers is ensured, the proportion of the magnetic barrier layers is ensured, and the performance of the motor is improved.

In some embodiments, the slit grooves 3 are composed of arc line segments and/or straight line segments, and are arranged at intervals along the q axis, the radian of the arc line segments of the slit grooves 3 is gradually increased from the rotor shaft hole side to the rotor outer circle side, and the radian of the outer arc of the slit groove 3 on the same layer is larger than that of the inner arc of the slit groove 3 on the same layer; or both ends of the slit groove 3 extend substantially in the d-axis direction, and the width of the slit groove 3 gradually increases from the middle position (q-axis) of the slit groove 3 to both ends (d-axis). Open in the middle of the rotor has shaft hole 4, and such setting mode can increase the utilization ratio in rotor space, and rational arrangement slot 3 to increase rotor salient pole ratio, promote motor reluctance torque.

In some embodiments, the two ends of part or all of the slit grooves 3 are parallel to the d-axis, and this arrangement can increase the utilization rate of the rotor space, arrange the slit grooves 3 reasonably, and at the same time, ensure the width of the magnetic conduction channel, and help to improve the performance of the motor.

In some embodiments, the slit groove 3 is one or more of a linear groove or an arcuate groove or a profiled groove.

In some embodiments, the partial slit grooves 3 are irregularly shaped grooves, and each irregularly shaped groove includes a first straight groove section, an arc groove section, and a second straight groove section connected in sequence, and the first straight groove section and the second straight groove section are both parallel to the d-axis, and the arc groove section protrudes toward the side away from the shaft hole 4. When part or all of the narrow slits 3 are arc-shaped grooves, the arc-shaped grooves avoid the arrangement of the shaft hole 4, and the arc-shaped grooves protrude towards one side far away from the shaft hole 4. The partial slit groove 3 is a linear groove which is arranged parallel to the d-axis and which is located between the first filling groove 21 and the profiled groove. The arrangement mode can ensure the width of the magnetic guide channel close to the side of the shaft hole on the basis of reasonably utilizing the rotor space, and is beneficial to improving the performance of the motor.

In some embodiments, the curve length between the end portions of each layer of the slit grooves 3 near the two second filling grooves 22 gradually decreases from the rotor shaft hole side to the rotor outer circumferential side, and the curve length of the adjacent slit grooves 3 decreases by a proportion of 5% to 20%. The shaft hole 4 is arranged in the middle of the rotor, so that the purpose of setting is to ensure the proportion of the magnetic barrier layer under the condition of reasonably utilizing the space of the rotor, and the performance of the motor is improved.

In some embodiments, the spacing d5 between the filled slots and the outer circle of the rotor satisfies d5 ≧ 0.5 σ, σ being the width of the air gap between the stator inner diameter and the rotor outer diameter. Under the condition of guaranteeing rotor mechanical strength, reduce motor magnetic leakage, promote motor efficiency.

In some embodiments, the extending direction of the filling grooves is parallel to the d axis, the angle deviation is not more than 5%, and a smooth magnetic conduction channel can be formed between the adjacent filling grooves.

In some embodiments, the width of the end part of the filling groove close to the outer circle side of the rotor along the q-axis direction is not more than the width of the end part of the filling groove close to the inner hole side of the rotor along the q-axis direction, more preferably, the width of the filling groove along the q-axis direction is approximately equal from the outer circle side of the rotor to the q-axis position of the rotor, the width deviation is not more than 5%, the magnetic channel width between the rotor magnetic barrier layers close to the air gap is ensured, and the rotor saturation is reduced.

In some embodiments, the rotor structure comprises at least five filling grooves with different areas; the total area of the filling grooves (the first filling groove 21, the second filling groove 22) should account for 30% -70% of the total area of the rotor grooves (the first filling groove 21, the second filling groove 22, the slit groove 3), and more preferably, the ratio is 35% -50%, so as to ensure a certain ratio of the filling groove area, and enable the motor to have a certain load starting capability.

In some embodiments, the ratio τ between the maximum thickness and the minimum thickness of all the filled trenches in the q-axis direction satisfies 1 ≦ τ ≦ 2, and more preferably, the ratio should satisfy 1.3 ≦ τ ≦ 1.5. The ratio is limited, on one hand, the efficiency cannot be influenced because the width of the magnetic conduction channel is too small due to the fact that the thickness of the filling groove is too large in the q-axis direction, and on the other hand, the starting cannot be influenced because the area of the filling groove is too small due to the fact that the thickness of the filling groove is too small in the q-axis direction.

In some embodiments, the maximum thickness of each second filling groove 22 in the q-axis direction is generally gradually increased toward the d-axis direction; more preferably, the maximum width of each second filling groove 22 in the q-axis direction increases continuously by at least 3 layers toward the d-axis direction; optimally, the maximum width of each second filling groove 22 in the q-axis direction decreases continuously from the second layer of the magnetic barrier layer close to the d-axis to the magnetic barrier layer close to the outer circle side of the rotor in the direction away from the d-axis. By the arrangement, the amount of cast aluminum with a proper area can be ensured under the condition of reasonably utilizing the space of the rotor, and the starting capability of the motor is improved.

In some embodiments, the first filling grooves 21 and the second filling grooves 22 are filled with an electrically and magnetically conductive material, preferably aluminum or aluminum alloy, and the filling grooves are self-short-circuited by end rings at both ends of the rotor to form a squirrel cage structure, wherein the material of the end rings is the same as that of the filling grooves. The squirrel-cage structure with self-short circuit provides asynchronous torque at the starting stage of the motor so as to realize the self-starting of the motor; the multi-layer magnetic barrier layer structure provides reluctance torque for the motor so as to realize synchronous operation of the motor.

In some embodiments, the first filling grooves 21 are located in the q-axis direction of the rotor outer periphery and extend in a direction parallel to the d-axis, and may be arranged in blocks or may be arranged in blocks. By the arrangement, a smooth magnetic conduction channel can be formed between the adjacent magnetic barrier layers.

In some embodiments, the first fill slot 21 comprises a plurality of q-axis fill slots, i.e., n ≧ 1, n being the number of q-axis fill slots the first fill slot 21 comprises. The outermost magnetic barrier layer composed of the first filling grooves 21 near the outer circumferential side of the rotor is the most easily deformable portion of the rotor, and the deformation of the rotor at this position can be reduced by dividing the outermost first filling grooves 21 into a plurality of q-axis filling grooves.

In some embodiments, ribs 6 are arranged in blocks between adjacent q-axis filling grooves, the number m of the ribs is equal to or larger than 3, the ratio of m to the radius Rr of the rotor is equal to or larger than 0.07, meanwhile, the sum of the widths of the ribs 6 along the d-axis direction sigma L8 and the ratio of the radius Rr of the rotor are equal to or larger than 0.045 sigma L8/Rr, and L8 is the width of the ribs 6. The outermost magnetic barrier layer composed of the first filling grooves 21 near the outer circumferential side of the rotor is the most easily deformable portion of the rotor, and the deformation of the rotor at this position can be reduced by dividing the outermost first filling grooves 21 into a plurality of q-axis filling grooves. And meanwhile, the total width of the ribs 6 between the q-axis filling grooves is limited, so that the stress area of the outermost magnetic barrier layer of the rotor can be ensured, the mechanical strength of the rotor is further enhanced, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

In some embodiments, the width difference between the ribs 6 is within ± 20%, and the minimum value L9 of the width of each rib 6 should satisfy L9 ≧ σ, which is the width of the air gap between the stator inner diameter and the rotor outer diameter, to reduce local deformation of the rotor at the outermost magnetic barrier layer

In some embodiments, different portions of the same rib 6 have equal or unequal widths in the d-axis direction. The same rib 6 may be provided with a larger width in the d-axis direction at a portion where the risk of local deformation is large, and a smaller width in the d-axis direction at a portion where the risk of local deformation is small.

In some embodiments, the included angle α 1 between the two ends of the first filling groove 21 and the connecting line of the rotor center should satisfy 20 ° ≦ α 1 ≦ 60 °, more preferably, α 1 should satisfy 30 ° ≦ α 1 ≦ 50 °, and most preferably, α 1 should satisfy 30 ° ≦ α 1 ≦ 35 °. With the arrangement, the first filling groove 21 forms a magnetic barrier layer and serves as a filling groove, so that the magnetic barrier layer can be used as a magnetic barrier layer to increase the reluctance torque of the motor, and can also be used as a starting squirrel cage for improving the starting performance of the motor.

In some embodiments, the width of the independent filling groove in the d-axis direction is smaller than the width in the d-axis direction between the end portions of the two second filling grooves 22 in the adjacent magnetic barrier layers adjacent thereto on the side close to the slit groove 3. The width of the first filling groove 21 in the d-axis direction is limited to avoid deformation of the rotor toward the axial hole side or the outer circle side due to an excessive width.

In some embodiments, the ratio of the distance L10 from the rotor center in the q-axis direction of the first filling groove 21 to the rotor radius Rr satisfies 0.82 ≦ L10/Rr ≦ 0.96. The ratio of the distance of the side edges of the two innermost magnetic barrier layers close to the shaft hole side on the q axis to the width of the rotating shaft on the q axis is more than 1.2. The ratio of the diameter of an arc line segment of the side edge of the innermost magnetic barrier layer close to the shaft hole side and close to the shaft hole side to the width of the rotating shaft on the q axis is more than 2. If L10/Rr is too small, the outermost magnetic conduction channel is too narrow, the loss of the motor is increased, and the efficiency is reduced; if L10/Rr is too large, the distance between the first filling groove 21 and the outer circumference of the rotor becomes too small, which increases the difficulty of machining.

In some embodiments, the maximum width of the shaft hole 4 in the q-axis direction is not greater than the maximum width of the shaft hole 4 in the d-axis direction. The slot grooves 3 are arranged in the q-axis direction, and the utilization rate of the rotor space can be increased by the arrangement mode, so that the slot grooves 3 are reasonably arranged, the rotor salient pole ratio is increased, and the motor reluctance torque is improved.

In some embodiments, the axial bore 4 is comprised of arc and/or straight segments.

As shown in fig. 2, the difference from the rotor core 1 shown in fig. 1 is that the rotor core 1 in the figure has a first filling groove 21 in a one-piece arrangement structure, and the shaft hole of the first filling groove is in an oval shape or a shape similar to the oval shape and composed of multiple straight lines.

It should be noted that, in the present invention, the length, width, thickness, diameter, etc. of the structure related to the rotor core 1 can all be measured in mm.

According to the utility model discloses an embodiment still provides a from starting synchronous reluctance motor, especially a from starting synchronous reluctance two-pole electric machine, including foretell electric motor rotor, the load inertia that this motor shaft output is connected is less than 60% of the pivot system inertia of motor itself.

According to the utility model discloses an embodiment still provides a compressor, including foretell synchronous reluctance machine that starts.

The utility model provides a self-starting synchronous reluctance motor rotor, which realizes the self-starting of the motor through the asynchronous torque provided by the rotor conducting bar (i.e. the filling groove is filled to form a component), solves the problem that the synchronous reluctance motor needs the driving of a frequency converter, reduces the loss of the motor and improves the efficiency of the motor; the motor rotor can reduce the harmonic wave of the motor, reduce the torque pulsation, reduce the harmonic loss and improve the efficiency and the operation stability of the motor; the mechanical strength of the rotor can be enhanced, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

According to the utility model discloses an embodiment still provides a from starting synchronous reluctance motor, especially a from starting synchronous reluctance two-pole motor, including foretell electric motor rotor, the load inertia that this motor shaft output is connected is less than 60% of the pivot system inertia of motor itself.

According to the utility model discloses an embodiment still provides a compressor, including foretell synchronous reluctance machine that starts.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (43)

1. A motor rotor is characterized by comprising a rotor core (1), wherein the rotor core (1) is provided with a filling groove and a slit groove (3), the filling groove comprises a second filling groove (22) and a first filling groove (21), the rotor core (1) is provided with a plurality of magnetic barrier layers spaced along a q axis of the rotor core, the plurality of magnetic barrier layers comprise 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 comprise a first filling groove (21), the inner magnetic barrier layers comprise a slit groove (3) and second filling grooves (22) positioned at two ends of the slit groove (3), a dividing rib (5) is arranged between the second filling groove (22) and the slit groove (3) in the same inner magnetic barrier layer, the center of the dividing rib (5) in a first quadrant formed by a d axis and a q axis meets the relation of the distance between the d axis and the q axis which is-v + lambda, wherein Wq is the distance from the center of the segmentation rib (5) to the q axis, Wd is the distance from the center of the segmentation rib (5) to the d axis, v is more than or equal to 0.28 and less than or equal to 0.46, and lambda is more than or equal to 28 and less than or equal to 33.

2. The motor rotor as recited in claim 1, characterized in that the distance along the direction of the axis d of the side edge of the dividing rib (5) close to the outer circle of the rotor in two adjacent magnetic barrier layers is L, the maximum distance along the direction of the axis q of the magnetic conduction channel formed between the filling grooves in the two adjacent magnetic barrier layers is W, and L is more than or equal to 0 and less than 2W.

3. An electric machine rotor as claimed in claim 2, characterized in that 0 ≦ L < W.

4. A rotor according to claim 3, characterised in that 0. ltoreq. L.ltoreq.0.8W.

5. An electric machine rotor as claimed in claim 2, characterized in that the width of the air gap formed between the stator inner diameter and the rotor outer diameter is σ, 0 ≦ L < 8 σ.

6. An electric machine rotor, according to claim 5, characterized in that 0 ≦ L ≦ 6 σ.

7. The electric machine rotor according to claim 1, characterized in that the width in the d-axis direction of the division rib (5) of the magnetic barrier layer composed of the outermost slit groove (3) near the outer circle side of the rotor and the second filling groove (22) is L1, the width in the d-axis direction of the division rib (5) of the innermost magnetic barrier layer near the shaft hole side is L2, L1 is not less than L2, and L1 is not less than 0.5 σ, σ is the width of the air gap between the stator and the rotor; and/or the magnetic barrier structure under one rotor pole is symmetrically arranged around the q axis and is radially arranged by more than two layers.

8. The electric machine rotor according to claim 1, characterized in that the minimum width d1 of the magnetic channel between two adjacent second filling grooves (22) is greater than the minimum width d2 of the magnetic channel formed between the slit grooves (3) corresponding to the two second filling grooves (22), and d1 is greater than or equal to 1.15d 2.

9. The motor rotor as claimed in claim 8, wherein 1.2d2 ≦ d1 ≦ 1.35d 2.

10. The rotor of claim 1, wherein the minimum distance d3 along the q-axis direction of two adjacent magnetic barrier layers, d3 is more than or equal to 1.5d4, and d4 is the minimum width along the q-axis direction of the magnetic barrier layer with smaller width along the q-axis direction in the two adjacent magnetic barrier layers.

11. The electric machine rotor of claim 1, wherein the magnetic conductive channels are formed between two adjacent magnetic barrier layers, and the width of each magnetic conductive channel in the direction of the q axis gradually decreases in the direction away from the d axis.

12. The electric machine rotor of claim 11, wherein the width of each of the magnetic-conductive channels in the direction of the q-axis decreases continuously in a direction away from the d-axis by at least three layers; and/or a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and for any magnetic conduction channel, the width of the magnetic conduction channel is gradually increased from the q axis to the two sides of the q axis.

13. The motor rotor according to claim 1, characterized in that the width in the d-axis direction of the second filling grooves (22) at both ends of the outermost slot groove (3) near the outer circle of the rotor is L3, the width in the d-axis direction of the second filling groove (22) at both ends of the slot groove (3) near the shaft hole side adjacent thereto is L4, 0.2 ≦ L3/L4 ≦ 0.9; and/or the width of the second filling groove (22) at the two ends of the innermost layer slit groove (3) close to the shaft hole side along the d-axis direction is L5, and the L3/L5 is more than or equal to 0.1 and less than or equal to 0.7.

14. The electric machine rotor of claim 13, wherein 0.45 ≦ L3/L4 ≦ 0.65; and/or, L3/L5 is more than or equal to 0.3 and less than or equal to 0.35.

15. The rotor of an electric motor according to claim 1, wherein in the outermost magnetic barrier layer near the outer circumferential side of the rotor, the distance in the d-axis direction between the dividing ribs (5) between the slit grooves (3) and the filling grooves and the slit grooves (3) and the dividing ribs (5) between the filling grooves adjacent to the outermost magnetic barrier layer is L6, the distance in the d-axis direction between the dividing ribs (5) between the slit grooves (3) and the filling grooves of the outermost magnetic barrier layer and the dividing ribs (5) between the slit grooves (3) and the filling grooves of the innermost magnetic barrier layer near the rotor shaft hole side is L7, and the ratio of L6 to L7 satisfies 0. ltoreq. L6/L7. ltoreq. 0.6.

16. The rotor as claimed in claim 15, wherein 0 ≦ L6/L7 ≦ 0.4.

17. The rotor as claimed in claim 16, wherein 0 ≦ L6/L7 ≦ 0.2.

18. The rotor of an electric machine according to claim 1, characterized in that in each layer of the magnetic barrier layers, the ratio of the width of the slot groove (3) in the q axis to the width of the slot groove (3) near the end of the filling groove is τ 1, τ 1 increasing from the innermost layer of the magnetic barrier layer to the outermost layer of the magnetic barrier layer; and/or in each layer of magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slit groove (3) on the q-axis is tau 2, and the tau 2 is more than 1.4.

19. An electric machine rotor as claimed in claim 18, characterized in that 1.5 < τ 2 < 3.0.

20. A motor rotor according to claim 1, characterised in that the slot slots (3) are made up of arc segments and/or straight segments and are spaced along the q axis, the arc of the arc segments of the slot slots (3) gradually increases from the rotor shaft bore side to the rotor outer circumference side, and the outer arc of the slot slots (3) of the same layer is greater than the inner arc; alternatively, both ends of the slit groove (3) extend substantially in the d-axis direction, and the width of the slit groove (3) gradually increases from the middle position of the slit groove (3) to both ends.

21. An electric machine rotor, according to claim 1, characterised in that the two ends of some or all of the slot slots (3) are parallel to the d-axis.

22. An electric machine rotor according to claim 1, characterised in that the partial slot grooves (3) are profiled grooves, and each profiled groove comprises a first straight groove section, an arc groove section and a second straight groove section connected in sequence, and both the first straight groove section and the second straight groove section are parallel to the d-axis, and the arc groove section protrudes towards the side away from the shaft hole (4).

23. The motor rotor according to claim 1, characterized in that when some or all of the slot grooves (3) are arc-shaped grooves, the arc-shaped grooves are arranged to avoid the shaft hole (4), and the arc-shaped grooves protrude towards the side far away from the shaft hole (4); and/or the partial slit grooves (3) are linear grooves which are arranged in parallel to the d axis and are positioned between the first filling groove (21) and the special-shaped grooves.

24. The motor rotor as recited in claim 1, characterized in that the curve length between the ends of each layer of slit grooves (3) close to the two second filling grooves (22) is gradually decreased from the rotor shaft hole side to the rotor outer circle side, and the curve length decreasing proportion of the adjacent slit grooves (3) is 5% -20%; and/or the interval d5 between the filling groove and the outer circle of the rotor meets the condition that d5 is more than or equal to 0.5 sigma, and the sigma is the width of an air gap between the inner diameter of the stator and the outer diameter of the rotor.

25. An electric machine rotor as claimed in claim 1, characterised in that the filling slot extends parallel to the d-axis with an angular deviation of not more than 5%; and/or the width of the end part of the filling groove close to the outer circle side of the rotor along the q-axis direction is not larger than the width of the end part of the filling groove close to the inner hole side of the rotor along the q-axis direction.

26. The electric machine rotor of claim 25, wherein the width of the filling groove in the q-axis direction deviates by no more than 5% from the outer circumferential side of the rotor to the q-axis of the rotor.

27. The rotor of an electric machine according to claim 1, characterized in that the rotor core (1) has at least five filling slots with different filling areas; and/or the total filling area of the first filling groove (21) and the second filling groove (22) accounts for 30-70% of the total area of the first filling groove (21), the second filling groove (22) and the slit groove (3).

28. An electric machine rotor, according to claim 27, characterised in that the total filling area of the first filling groove (21) and the second filling groove (22) amounts to 35-50% of the total area of the first filling groove (21), the second filling groove (22) and the slot groove (3).

29. An electric machine rotor, as claimed in claim 1, characterized in that the ratio τ between the maximum thickness and the minimum thickness of all the filled slots in the direction of the q-axis is 1 ≦ τ ≦ 2.

30. An electric machine rotor as claimed in claim 29, characterized in that τ is 1.3 ≦ 1.5.

31. The electric machine rotor as recited in claim 1, characterized in that the maximum thickness of each second filling groove (22) in the direction of the q-axis gradually increases towards the direction of the d-axis.

32. A rotor according to claim 31, characterised in that the maximum width of each second filling slot (22) in the direction of the q-axis increases continuously in the direction towards the d-axis for at least three levels.

33. An electric machine rotor according to claim 32, characterized in that the maximum width of each second filling groove (22) in the direction of the q axis decreases continuously in the direction away from the d axis from the second layer of the magnetic barrier layer near the d axis to the magnetic barrier layer near the outer circumferential side of the rotor.

34. The motor rotor as recited in claim 1, characterized in that the slots of the first filling slot (21) and the second filling slot (22) are filled with conductive and non-conductive material, and the filling slots are self-short-circuited by end rings at two ends of the rotor core (1) to form a squirrel cage structure; and/or the first filling groove (21) is positioned in the q-axis direction of the outer periphery of the rotor and extends along the direction parallel to the d axis, the first filling groove (21) comprises n q-axis filling grooves, and n is more than or equal to 1.

35. An electric machine rotor according to claim 34, characterized in that there are ribs (6) between two adjacent q-axis filled slots, the number m of which satisfies m ≧ 3, and the ratio of m to the rotor radius Rr ≧ 0.07, and the sum Σ L8 of the widths of the ribs (6) in the d-axis direction and the ratio of the rotor radius Rr ∑ L8/Rr ≧ 0.045, L8 being the width of the rib (6).

36. An electric machine rotor, according to claim 34, characterized in that the width difference between the ribs (6) is within ± 20%, the minimum value L9 of the width of each rib (6) being such that L9 ≧ σ, σ being the width of the air gap between the stator inner diameter and the rotor outer diameter.

37. An electric machine rotor according to claim 1, characterised in that the angle between the two ends of the first filling groove (21) and the line connecting the centre of the rotor is α 1, 20 ° ≦ α 1 ≦ 60 °.

38. The electric machine rotor as recited in claim 37, wherein α 1 is 30 ° ≦ 50 °.

39. The electric machine rotor as recited in claim 38, wherein 30 ° ≦ α 1 ≦ 35 °.

40. An electric machine rotor according to claim 1, characterized in that the width of the first filling groove (21) in the d-axis direction is smaller than the width in the d-axis direction between the end portions of two second filling grooves (22) in the adjacent magnetic barrier layers on the side close to the slit groove (3).

41. The electric machine rotor as recited in claim 1, characterized in that the ratio of the distance L10 from the rotor center in the q-axis direction of the first filling groove (21) to the rotor radius Rr satisfies 0.82 ≦ L10/Rr ≦ 0.96; and/or the ratio of the distance of the side edges, close to the shaft hole side, of the two innermost magnetic barrier layers close to the shaft hole side on the q axis to the width of the rotating shaft on the q axis is more than 1.2; and/or the ratio of the diameter of an arc line segment of the side edge of the innermost magnetic barrier layer close to the shaft hole side and close to the shaft hole side to the width of the rotating shaft on the q axis is more than 2; and/or the maximum width of the shaft hole (4) in the q-axis direction is not greater than the maximum width of the shaft hole (4) in the d-axis direction.

42. A self-starting synchronous reluctance machine comprising an electric machine rotor according to any one of claims 1 to 41.

43. A compressor comprising the self-starting synchronous reluctance motor of claim 42.

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