CN114513067A - Self-starting synchronous reluctance motor rotor, motor and compressor - Google Patents

Abstract

The invention provides a self-starting synchronous reluctance motor rotor, a motor and a compressor, wherein the self-starting synchronous reluctance motor rotor comprises a rotor core and an end ring, the rotor core comprises a first rotor punching sheet and a second rotor punching sheet, the first rotor punching sheet is provided with a first filling groove, a second filling groove and a slit groove, the first filling groove and the slit groove are arranged in the same layer, and the second filling groove is positioned on the outermost layer in the q-axis direction of the rotor and is not in the same layer with the slit groove; the second rotor punching sheet can cover all or part of the second filling groove on the first rotor punching sheet. According to the invention, harmonic waves generated by eddy currents in the second filling groove can be reduced, the harmonic content of the motor is reduced, the problems of the torque pulse rate and the vibration noise of the motor are solved, and the running reliability of the motor is improved; by effectively reducing the magnetic field harmonic wave, the problems of torque pulsation and vibration noise caused by the harmonic wave are avoided.

Description

Self-starting synchronous reluctance motor rotor, motor and compressor

Technical Field

The invention relates to the technical field of motors, in particular to a self-starting synchronous reluctance motor rotor, a motor and a compressor.

Background

The self-starting synchronous reluctance motor combines the advantages of an asynchronous motor on the basis of the synchronous reluctance motor, can realize the self-starting of the motor by means of asynchronous torque generated by a rotor conducting bar under the condition of no need of a controller, and can also run efficiently at a synchronous rotating speed. Compared with an asynchronous motor, the self-starting synchronous reluctance motor runs at a synchronous rotating speed, the rotor loss is low, and the motor efficiency is obviously improved; compared with a self-starting permanent magnet synchronous motor, the self-starting synchronous reluctance motor does not use rare earth permanent magnet materials, the manufacturing cost of the motor is low, and the risk of demagnetization is avoided. However, the rotor of the self-starting synchronous reluctance motor is often designed into a multi-layer magnetic barrier structure, the magnetic structure of the rotor is complex, and the harmonic content is large during the operation of the motor, which is not favorable for the performance of stable operation of the motor.

The invention provides a self-starting synchronous reluctance motor rotor, a motor and a compressor, which are researched and designed because the self-starting synchronous reluctance motor in the prior art has the technical problems of complicated rotor magnetic circuit structure, large harmonic content during the operation of the motor, unfavorable performance for the stable operation of the motor and the like.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of complex rotor magnetic circuit structure, large harmonic content during the operation of the motor and unfavorable performance for the stable operation of the motor of the self-starting synchronous reluctance motor in the prior art, thereby providing the self-starting synchronous reluctance motor rotor, the motor and the compressor.

In order to solve the problems, the invention provides a self-starting synchronous reluctance motor rotor which comprises a rotor core and an end ring, wherein the rotor core comprises a first rotor punching sheet and a second rotor punching sheet, the first rotor punching sheet is provided with a first filling groove, a second filling groove and a slit groove, the first filling groove and the slit groove are arranged in the same layer, and the second filling groove is positioned on the outermost layer of the rotor in the q-axis direction and is not in the same layer as the slit groove; the second rotor punching sheet can cover all or part of the second filling groove on the first rotor punching sheet.

In some embodiments, a third filling groove is formed in the second rotor punching sheet, the third filling groove is opposite to the first filling groove, a fourth filling groove is formed in the second rotor punching sheet, or no fourth filling groove is formed in the second rotor punching sheet, when the fourth filling groove is formed, the fourth filling groove is opposite to the second filling groove, and the number of the fourth filling grooves is smaller than that of the second filling grooves, so that the second filling groove is partially covered; and when the fourth filling groove is not arranged, the second rotor punching sheet can cover the second filling groove completely.

In some embodiments, the second filling groove is composed of an integral groove or a plurality of segmented grooves, and when the second filling groove is composed of an integral groove, no fourth filling groove is arranged on the second rotor punching sheet at a position opposite to the second filling groove; when the second filling groove is composed of a plurality of segmented grooves, the segmented grooves are communicated into a whole, a fourth filling groove is not arranged or at least one fourth filling groove is arranged at a position, opposite to the second filling groove, on the second rotor punching sheet, and the at least one fourth filling groove is partially opposite or completely opposite to the second filling groove so as to partially or completely shield the second filling groove.

In some embodiments, a first shaft hole is formed in a central position of the first rotor punching sheet, a second shaft hole is formed in a central position of the second rotor punching sheet, and the second shaft hole is opposite to the first shaft hole.

In some embodiments, the first rotor punching sheet and the second rotor punching sheet are stacked, the second rotor punching sheets are located at two axial ends of the rotor core, and the axial stacking height of the second rotor punching sheet at each end is not less than the thickness of a single first rotor punching sheet.

In some embodiments, the length, width or area of some or all of the filling grooves on the second rotor sheet is not greater than the filling grooves at the same position on the first rotor sheet, the filling grooves on the second rotor sheet include a third filling groove and a fourth filling groove, and the filling grooves on the first rotor sheet include a first filling groove and a second filling groove.

In some embodiments, the maximum width of the outer contour of the second rotor sheet is not greater than the diameter of the outer circle of the first rotor sheet, the second axial hole of the second rotor sheet is in an elliptical shape, the major axis of the ellipse is located on the q axis, the minor axis of the ellipse is located on the d axis, and the ratio k1/k2 of the lengths of the major axis and the minor axis ranges from 1.1 to 1.5.

In some embodiments, the width kd of the second rotor punching sheet on the d axis is larger than the width kq of the second rotor punching sheet on the q axis, and 1.1-2.8 of kd/kq.

In some embodiments, in the direction of the d-axis, a distance between the width of the second axial hole inner edge of the second rotor sheet and the third filling groove is greater than or equal to 1 time greater than a distance between the width of a first dividing rib located at a position of the first rotor sheet opposite to the inner edge, and the first dividing rib is located between the slit groove and the first filling groove.

In some embodiments, the plurality of slit grooves in a region of the first rotor sheet opposite to the second axial hole of the second rotor sheet gradually decrease in area in a direction outward of the d-axis.

In some embodiments, the total area of the plurality of slot slots in the region of the first rotor sheet opposite the second axial hole of the second rotor sheet accounts for at least 40% of the total motor flow aperture area; the total area of the motor flow holes comprises the sum of the area of the stator flow holes and the area of the rotor flow holes.

In some embodiments, a maximum width of an outer profile of the end ring is not greater than a maximum width of an outer profile of the second rotor sheet, and a maximum distance from a center of the rotor core to an end face of the end ring in the axial direction is not less than a maximum distance from the center of the rotor core to an end face of the second rotor sheet; and/or the presence of a gas in the gas,

the end ring is of an unequal-width structure, the width md of the end ring along the d-axis direction is greater than the width mq of the end ring along the q-axis direction, and md/mq is more than or equal to 1.1 and less than or equal to 2.8.

In some embodiments, when no fourth filling groove is provided on the second rotor sheet, the first filling groove and the slit groove on the first rotor sheet together constitute a multilayer barrier layer structure of the rotor;

when a fourth filling groove is formed in the second rotor punching sheet, the first filling groove, the slit groove and the second filling groove in the first rotor punching sheet jointly form a multilayer magnetic barrier layer structure of the rotor.

In some embodiments, in each layer of the magnetic barrier layer structure composed of the first filling groove and the slit groove, a first dividing rib exists between the first filling groove and the slit groove, the width L of the first dividing rib on the same layer along the d-axis direction, the width of the end part of the first filling groove connected with the first dividing rib, which is arranged on the same layer with the first dividing rib, is M, the width between L and M is more than 0.2M and less than 0.35M, the width of the end part of the slit groove close to the first dividing rib, which is arranged on the same layer with the first dividing rib, is K, and the width between K and M is less than or equal to M.

In some embodiments, the second filling groove is composed of a plurality of grooves which are not communicated, and a second dividing rib is arranged between two adjacent grooves, the second dividing rib is in an equal-width structure or a non-equal-width structure, the equal-width structure is in a rectangle or a parallelogram, and the non-equal-width structure is in a trapezoid shape.

In some embodiments, the width h1 of the rib between all the first filling grooves and the second filling grooves and the outer circle of the rotor, the rib with the smallest width in the first division ribs and the second division ribs respectively has a width h1 ≧ 0.5 σ, where σ is the width of the air gap between the inner diameter of the motor stator and the outer diameter of the rotor.

In some embodiments, the ratio of the length d1 of the first filling groove along the d-axis direction at the two ends of the slot groove at the outermost layer to the length d2 of the first filling groove along the d-axis direction at the two ends of the adjacent slot groove satisfies 0.2 ≦ d1/d2 ≦ 0.9.

In some embodiments, the ratio of the length d1 of the first filling groove in the d-axis direction at the two ends of the slit groove at the outermost layer to the length d3 of the first filling groove in the d-axis direction at the two ends of the slit groove at the innermost layer satisfies 0.1 ≦ d1/d3 ≦ 0.7.

In some embodiments, the long sides of both end portions of some or all of the slit grooves are parallel to the d-axis; the slit groove comprises at least one of a straight line groove and an arc-shaped groove; when part of the slit groove is a combination of a straight line groove and an arc-shaped groove, the slit groove is composed of a straight line section, an arc line section and a straight line section, the straight line section is parallel to the d axis, and the arc line section protrudes towards the direction far away from the shaft hole; when part of the slit grooves are arc-shaped grooves, the arc line segments protrude towards the side far away from the shaft hole; when the partial slit groove is a straight groove, the long side of the straight groove is arranged parallel to the d-axis and is located closest to the second filling groove.

In some embodiments, the slot groove is composed of an arc line segment and/or a straight line segment, the arc degree of the arc line segment of the slot groove is gradually increased from the rotor shaft hole side to the rotor outer circle side, and the outer arc degree of the slot groove in the same layer is larger than or equal to the inner arc degree.

In some embodiments, the widths of the slit grooves in at least 3 layers of the slit grooves are gradually decreased from the radially inner side to the radially outer side at intermediate positions of the slit grooves.

In some embodiments, the sum of the widths of all slit grooves and the second filling groove is

Σ m2+ m1, the radial width from the outer circle of the first shaft hole to the outer circumference of the rotor is m3, and (∑ m2+ m1)/m3 is 0.2-0.5.

In some embodiments, the distance between arcs on the first rotor punching sheet on two sides of the first shaft hole and two innermost-layer slit grooves on two sides of the first shaft hole along the q-axis direction is S3, the diameter of the first shaft hole is d, and S3/d is 1.2-1.3, and the diameter of an inner arc of each innermost-layer slit groove is 1.5-3 times the diameter d of the first shaft hole.

In some embodiments, the distance between two adjacent first filling grooves on the first rotor punching sheet is S1, and S1 ≧ S2 is satisfied, where S2 is the distance in the q-axis direction at any position in two of the slit grooves opposite to the two adjacent first filling grooves.

In some embodiments, the total area of all of the first and second fill slots comprises 30% to 70% of the total area of all rotor slots, including the first fill slot, the second fill slot, and the slot.

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

the deviation of the inclination angle between the extending direction of the first filling groove and the d axis is not more than 5 degrees, and the deviation of the inclination angle between the extending direction of the second filling groove and the d axis is not more than 5 degrees;

the distance between the middle point of the first filling groove of at least three layers and the middle point of the first filling groove of the outer layer adjacent to the middle point of the first filling groove of at least three layers is gradually increased towards the outer side;

the width of the first filling groove on the same layer deviates from the inside to the outside along the direction of the d axis by not more than 5%;

the widths of the first filling grooves in at least three layers of the first filling grooves continuously decrease from inside to outside along the direction of the q axis;

the ratio of the width of at least 3 layers of the first filling grooves to the width of the middle position of the slit groove on the same layer from inside to outside along the direction of the q axis is more than 1.4;

the area of at least 3 layers of first filling grooves is gradually reduced from inside to outside along the direction of the q axis, and the amplitude of the area reduction is gradually enlarged, wherein the amplitude of the area reduction is defined as the ratio of the areas of the first filling grooves of the two adjacent layers;

the first rotor punching sheet at least comprises 5 filling grooves with different areas.

In some embodiments, the grooves of the first filling groove are filled with conductive and non-conductive materials, all the filling grooves are connected in a self-short circuit mode through end rings at two ends of the rotor to form a squirrel cage structure, and the material of the end rings is the same as that of the filling materials in the first filling groove;

and air is filled in part or all of the second filling grooves, and the conductive and non-conductive materials are prevented from being filled by blocking of the second rotor punching sheet.

In some embodiments, a magnetic conduction channel exists between two adjacent magnetic barrier layer structures, the width of the tail end of each magnetic conduction channel is larger than that of the center of each magnetic conduction channel, and a filling groove is not arranged in the middle area of any magnetic conduction channel;

the width of the middle of at least three layers of magnetic conduction channels gradually decreases from inside to outside along the direction of the q axis;

the width of any one magnetic conduction channel is gradually increased from the middle to two sides, and the width of the magnetic conduction channel is defined as the shortest distance from any point on one arc line to the other arc line.

The invention also provides an electric machine comprising a self-starting synchronous reluctance machine rotor as defined in any one of the preceding claims.

The invention also provides a compressor, which comprises the motor.

The self-starting synchronous reluctance motor rotor, the motor and the compressor provided by the invention have the following beneficial effects:

1. according to the invention, the second rotor punching sheet is arranged to cover the whole or part of the second filling groove on the first rotor punching sheet, and the second filling groove is influenced by eddy current generated in the second filling groove when being filled with conductive and non-conductive materials, so that the harmonic content of the motor can be increased; by effectively reducing the magnetic field harmonic wave, the problems of torque pulsation and vibration noise caused by the harmonic wave are avoided.

2. The invention also reasonably arranges the size position of the slit groove or the filling groove corresponding to each layer of magnetic barrier in the structure of the multiple layers of magnetic barriers on the first rotor punching sheet, thereby avoiding magnetic circuit saturation, reducing the harmonic content of the motor and improving the running reliability of the motor. The self-starting of the motor is realized through the asynchronous torque provided by the rotor conducting bar, the problem that the synchronous reluctance motor needs to be driven by a frequency converter is solved, the loss of the motor is reduced, and the efficiency of the motor is improved;

3. the size of the segmentation rib is limited, so that the structural strength of the rotor cannot be weakened due to the fact that the size of the segmentation rib is too small, the magnetic leakage of the motor cannot be increased due to the fact that the size of the segmentation rib is too large, efficiency is reduced, and the mechanical strength of the rotor can be enhanced through the structural design of the second rotor sheet and the size design of the segmentation rib between the rotor filling groove and the slit groove.

Drawings

Fig. 1 is a structural view of a first rotor segment of a self-starting synchronous reluctance motor rotor according to a first embodiment of the present invention;

fig. 2(a) is a structure diagram of a second rotor sheet according to the first embodiment of the present invention (outer layer full barrier);

fig. 2(b) is a structural view of a second rotor sheet according to the first embodiment of the present invention (outer layer partial barrier 1);

fig. 2(c) is a structural view of a second rotor sheet according to the first embodiment of the present invention (outer layer partial barrier 2);

fig. 3 is an axial view of a rotor core according to a first embodiment of the present invention (with the outer layer fully blocked);

fig. 4 is a structural view of a rotor end ring according to a first embodiment of the present invention;

FIG. 5 is an axial view of the rotor structure of the first embodiment of the present invention;

FIG. 6 is a perspective view of a rotor structure according to a first embodiment of the present invention;

fig. 7 is a structural view of a first rotor segment of a self-starting synchronous reluctance motor rotor according to a second embodiment of the present invention;

fig. 8 is a graph comparing current waveforms for the rotor structure of the present invention and the prior art.

The reference numerals are represented as:

1. a rotor core; 2. a second rotor sheet; 20. a second shaft hole; 21. a third filling groove; 22. a fourth filling groove; 3. an end ring; 4. a first rotor sheet; 5. filling the groove; 51. a first filling groove; 52. a second filling groove; 6. a slit groove; 7. a first shaft hole; 8. a first dividing rib; 82. and a second cutting rib.

Detailed Description

As shown in fig. 1 to 8, the present invention provides a self-starting synchronous reluctance motor rotor, which includes a rotor core 1 and an end ring 3, where the rotor core 1 includes a first rotor sheet 4 and a second rotor sheet 2 (preferably, the rotor core 1 is formed by laminating the first rotor sheet 4 and the second rotor sheet 2), the first rotor sheet 4 is provided with a first filling groove 51, a second filling groove 52 and a slit groove 6, the first filling groove 51 and the slit groove 6 are arranged in the same layer, and the second filling groove 52 is located at the outermost layer in the rotor q-axis direction and is different from the slit groove 6 in the same layer; the second rotor punching sheet 2 can cover all or part of the second filling grooves 52 on the first rotor punching sheet 4.

According to the invention, the second rotor punching sheet is arranged to cover the whole or part of the second filling groove on the first rotor punching sheet, and the second filling groove is influenced by eddy current generated in the second filling groove when being filled with conductive and non-conductive materials, so that the harmonic content of the motor can be increased; by effectively reducing the magnetic field harmonic wave, the problems of torque pulsation and vibration noise caused by the harmonic wave are avoided.

The invention provides a self-starting synchronous reluctance motor rotor structure which can weaken the magnetic field harmonic wave of a motor and has the effect of improving the stable operation performance of the motor through the limitation of a second rotor punching sheet on a second filling groove and the size limitation of a dividing rib between the rotor filling groove and a slit groove.

The invention is specifically explained below with reference to the embodiments in the drawings, fig. 6 is a schematic view of a rotor structure according to a first embodiment of the invention, the rotor structure includes a rotor core 1 and an end ring 3, where the rotor core 1 is formed by laminating a first rotor sheet 4 and a second rotor sheet 2, fig. 1 is a structural view of the first rotor sheet according to the first embodiment of the invention, the first rotor sheet 4 is provided with a filling groove 5, a slit groove 6 and a first shaft hole 7, and the filling groove 5 further includes a second filling groove 52 located at the outermost layer in the rotor q-axis direction and not arranged at the same layer as the slit groove and a first filling groove 51 located at the inner layer of the rotor and arranged at the same layer as the slit groove.

The invention provides a self-starting synchronous reluctance motor rotor structure, which mainly comprises the following points:

the rotor structure comprises a rotor core and an end ring, wherein the rotor core is formed by laminating a first rotor punching sheet and a second rotor punching sheet, a filling groove and a slit groove are formed in the first rotor punching sheet, the filling groove is located on the periphery of the rotor, and the first filling groove and the slit groove or the second filling groove form a multi-layer magnetic barrier layer structure of the rotor.

The second rotor punching sheets are placed at two ends of the iron core stacked by the first rotor punching sheets, the second rotor punching sheets are provided with first filling grooves which are the same as those of the first rotor punching sheets, the second rotor punching sheets are not provided with narrow-slit grooves, and the second rotor punching sheets are not provided with or only provided with partial second filling grooves.

In each layer of magnetic barrier layer structure, a dividing rib is arranged between the slit groove and the filling groove, the width of each layer of dividing rib along the d-axis direction is L, the width of the end part, close to the rib, of the filling groove arranged on the same layer with the dividing rib is M, the width of the end part, close to the rib, of the slit groove on the same layer is K, the condition that L is more than 0.2M and less than 0.35M is met, and K is less than or equal to M.

When the second filling groove is filled with the conductive and non-conductive magnetic materials, the harmonic content of the motor can be increased under the influence of eddy currents generated in the second filling groove. The second rotor punching sheet limits the filling of the conductive non-magnetic material in the second filling groove, so that harmonic waves generated by eddy currents in the second filling groove can be reduced, the harmonic content of the motor is reduced, and the running reliability of the motor is improved.

In the multilayer magnetic barrier structure on the first rotor punching sheet, the size and the position of a narrow slot or a filling slot corresponding to each layer of magnetic barrier are reasonably arranged, so that magnetic circuit saturation is avoided, the harmonic content of the motor is reduced, and the running reliability of the motor is improved.

In addition, the size of the split ribs is limited, so that the structural strength of the rotor cannot be weakened due to the fact that the size of the split ribs is too small, the magnetic leakage of the motor cannot be increased due to the fact that the size of the split ribs is too large, and efficiency is reduced.

In some embodiments, a third filling groove 21 is formed in the second rotor sheet 2, the third filling groove 21 is disposed opposite to the first filling groove 51, a fourth filling groove 22 is disposed or no fourth filling groove 22 is disposed in the second rotor sheet 2, when a fourth filling groove 22 is disposed, the fourth filling groove 22 is opposite to the second filling groove 52, and the number of the fourth filling grooves 22 is smaller than the number of the second filling grooves 52, so as to partially cover the second filling groove 52; when the fourth filling groove 22 is not provided, the second rotor sheet 2 can cover the position of the second filling groove 52 completely. According to the invention, the third filling groove opposite to the first filling groove is formed in the second rotor punching sheet, the first filling groove and the slit form a multi-magnetic-field structure, the starting performance of the motor is influenced, and the function of the conducting bar filled in the second filling groove is the starting function and is the same as that of the first filling groove, so that the second filling groove is shielded through part of the fourth filling groove formed in the second rotor punching sheet or no fourth filling groove formed in the second rotor punching sheet, and the conduction of the second filling groove is reduced or prevented.

Further, the second rotor punching sheet 2 is provided with a third filling groove 21 which is the same as the first filling groove 51 of the first rotor punching sheet 4, but the second rotor punching sheet 2 is not provided with or only provided with a part of the fourth filling groove 22, and the second rotor punching sheet 2 covers a part of or all the filling grooves. The second rotor punching sheet is so set up, and aim at prevents that the second from filling the inslot and filling electrically conductive non-magnetic material through blockking the effect, avoids this region to produce vortex and harmonic magnetic field, reduces motor harmonic content.

In some embodiments, the second filling groove 52 is composed of an integral groove or a plurality of segmented grooves, and when the second filling groove 52 is composed of an integral groove, the fourth filling groove 22 is not disposed on the second rotor sheet 2 at a position opposite to the second filling groove 52; when the second filling groove 52 is composed of a plurality of segmented grooves, the plurality of segmented grooves are communicated into a whole, and a fourth filling groove is not arranged or at least one fourth filling groove is arranged at a position on the second rotor sheet 2 opposite to the second filling groove 52, wherein at least one fourth filling groove 22 is partially or completely not opposite to the second filling groove 52, so as to partially or completely shield the second filling groove 52. This is a preferable configuration of the second filling groove of the present invention, the second filling groove may be an integral groove structure (second embodiment, see fig. 7), or may be a segmented groove structure (first embodiment, see fig. 1), the fourth filling groove 22 may be absent (see fig. 2(a)) to form a complete block of the second filling groove, the fourth filling groove 22 may be a multi-segment structure (see fig. 2(b)) to form a partial block of the second filling groove, and the fourth filling groove 22 may be a single-segment structure (see fig. 2(c)) to form a partial block of the second filling groove.

Fig. 7 is a structural diagram of a rotor sheet according to a second embodiment of the present invention, and as shown in the diagram, a second filling groove 52 is arranged between a slot groove at the outermost layer of the rotor and the outer circle of the rotor, and the second filling groove may adopt a communicating structure, that is, a dividing rib in the middle of a segmented second filling groove in the first embodiment is eliminated, the second filling grooves are communicated into a whole, and the second filling groove is not filled with an electrically and magnetically conductive material through the blocking effect of the second rotor sheet. In the second embodiment, the second filling groove is set to be a communicating structure, so that the d-axis magnetic resistance difference value and the q-axis magnetic resistance difference value can be increased, the magnetic resistance torque is fully utilized, and meanwhile, under the action of the second rotor punching sheet, the effect of reducing the magnetic field harmonic waves of the motor can be achieved.

The second filling grooves 52 of the present invention are not limited to be composed of a plurality of divided grooves or be formed by a plurality of grooves connected together into a whole, and when the second filling grooves 52 are composed of a plurality of divided grooves, there is no or only a part of the fourth filling grooves 22 on the same position on the second rotor sheet 2; when the second filling grooves 52 are communicated into a whole, the fourth filling grooves 22 are not arranged at the same position on the second rotor punching sheet 2 or the fourth filling grooves are arranged at the same position on the second rotor punching sheet but the number of the fourth filling grooves is smaller than that of the second filling grooves. Through the blocking effect of the second rotor punching sheet, the area of the second filling groove on the first rotor punching sheet cannot be completely filled, and therefore the harmonic content of the motor can be reduced.

In some embodiments, a first shaft hole 7 is formed in a central position of the first rotor punching sheet 4, a second shaft hole 20 is formed in a central position of the second rotor punching sheet 2, and the second shaft hole 20 is opposite to the first shaft hole 7. The first shaft hole of the first rotor punching sheet is preferably circular, the second shaft hole of the second rotor punching sheet is preferably elliptical, and the second shaft hole is preferably larger than the first shaft hole in area and can allow a rotating shaft to pass through.

In some embodiments, the first rotor punching sheet 4 and the second rotor punching sheet 2 are laminated, the second rotor punching sheets 2 are located at two axial ends of the rotor core 1, and the axial stacking height of the second rotor punching sheet 2 at each end is not less than the thickness of a single first rotor punching sheet 4. The first rotor punching sheet and the second rotor punching sheet are in the optimal structure form, the second rotor punching sheets are further placed at two ends of the rotor core, and the axial stacking height of the second rotor punching sheet at each end is not less than the thickness of the single first rotor punching sheet. The second rotor punching sheet only has the effect of blocking the filling effect of the second filling groove on the rotor core, and the height of the second rotor punching sheet is not too large.

In some embodiments, the length, width or area of some or all of the filling grooves on the second rotor sheet is not greater than the filling grooves at the same position on the first rotor sheet, the filling grooves on the second rotor sheet include a third filling groove and a fourth filling groove, and the filling grooves on the first rotor sheet include a first filling groove and a second filling groove. The area and the like of the filling groove on the second rotor punching sheet are not too large, otherwise, the filling material is easy to permeate into the slit groove in the rotor manufacturing process, and the material waste is caused.

In some embodiments, the maximum width of the outer contour of the second rotor sheet 2 is not greater than the diameter of the outer circle of the first rotor sheet 4, the second axial hole 20 of the second rotor sheet 2 is an ellipse, the major axis of the ellipse is located on the q axis, the minor axis of the ellipse is located on the d axis, and the ratio k1/k2 of the lengths of the major axis and the minor axis ranges from 1.1 to 1.5. The second rotor punching sheet is used as a part of a rotor core, the outer contour of the second rotor punching sheet is not larger than the outer circle of the rotor core, and an air gap with a certain width is formed between the second rotor punching sheet and a stator; the q-axis direction of the inner contour of the rotor core corresponds to the slit groove of the rotor core, and the q-axis width of the rotor core is not less than the d-axis width, so that the slit grooves with enough area are in direct contact with air to form circulation holes, and the heat dissipation of the rotor is increased.

In some embodiments, the width kd of the second rotor punching sheet 2 on the d axis is greater than the width kq thereof on the q axis, and 1.1 ≦ kd/kq ≦ 2.8, and more preferably 1.2 ≦ kd/kq ≦ 1.8. By the arrangement, the second rotor punching sheet can only block one part of the filling groove and the slit groove, and most of the slit groove is exposed to be used as the circulation hole.

In some embodiments, in the direction of the d axis, the distance between the inner edge of the second shaft hole 20 of the second rotor sheet 2 and the third filling groove 21 is greater than 1 time or more of the distance between the width of the first dividing rib 8 at the position of the first rotor sheet opposite to the inner edge, and the first dividing rib 8 is located between the slit groove and the first filling groove 51. The first dividing rib is used for separating the distance between the first filling groove and the slit groove, so that the width of the first dividing rib is ensured, and the filling effect of the filling material in the manufacturing process can be better ensured.

In some embodiments, the plurality of slit grooves 6 in the region of the first rotor punching sheet 4 opposite to the second shaft hole 20 of the second rotor punching sheet 2 gradually decrease in area in the d-axis outward direction; and the total area of the plurality of slit grooves 6 in the area of the first rotor punching sheet 4 opposite to the second shaft hole 20 of the second rotor punching sheet 2 accounts for at least 40% of the total area of the motor flow hole; the total area of the motor flow holes comprises the sum of the area of the stator flow holes and the area of the rotor flow holes. The narrow slit groove on the rotor not only serves as a magnetic barrier, but also can serve as a circulation hole, the area proportion of the narrow slit groove in the inner hole of the second rotor punching sheet is guaranteed, the circulation hole on the rotor can be fully utilized, and the heat dissipation of the motor is facilitated.

In some embodiments, the maximum width of the outer contour of the end ring 3 is not greater than the maximum width of the outer contour of the second rotor sheet 2, and the maximum distance from the center of the rotor core 1 to the end face of the end ring 3 along the axial direction is not less than the maximum distance from the center of the rotor core 1 to the end face of the second rotor sheet 2; the maximum width of the outer contour of the end ring is not greater than that of the outer contour of the second rotor sheet, so that the part, which is not the second rotor sheet covering surface, of the rotor core is ensured, the stress is generated when materials are filled, and the local deformation is reduced; the maximum distance from the center of the rotor core to the end face of the end ring is not less than the maximum distance from the center of the rotor core to the end face of the second rotor punching sheet, the end ring with a certain volume of the rotor is guaranteed, and the starting capability of the motor is improved.

The end ring 3 is in a non-uniform width structure, the width md of the end ring along the d-axis direction is greater than the width mq along the q-axis direction, md/mq is more than or equal to 1.1 and less than or equal to 2.8, and md/mq is more preferably more than or equal to 1.2 and less than or equal to 1.8. The width ratios of the end rings in different directions can be ensured to be in the range, the material consumption of the end rings can be ensured, the starting capability of the motor is improved, most areas of the slit grooves can be reserved to be used as circulation holes, and the heat dissipation capability of the motor is improved.

In some embodiments, when the fourth filling groove 22 is not disposed on the second rotor sheet 2, the first filling groove 51 and the slit groove 6 on the first rotor sheet 4 together form a multilayer magnetic barrier layer structure of the rotor;

when the fourth filling groove 22 is formed in the second rotor punching sheet 2, the first filling groove 51, the slit groove 6 and the second filling groove 52 in the first rotor punching sheet 4 jointly form a multilayer magnetic barrier layer structure of the rotor.

The structure of the multilayer magnetic barrier layer enables a magnetic resistance difference between d and q axes on the rotor, and therefore magnetic resistance torque is generated.

In some embodiments, in each magnetic barrier layer structure composed of a first filling groove and a slit groove, a first dividing rib 8 is present between the first filling groove and the slit groove, a width L of the first dividing rib in the direction of the d axis in the same layer, a width of an end portion of the first filling groove 51 in the same layer as the first dividing rib, which is connected to the first dividing rib 8, is M, a width between L and M satisfies 0.2M < L < 0.35M, a width of an end portion of the slit groove 6 in the same layer as the first dividing rib, which is close to the first dividing rib 8, is K, and a width between K and M satisfies K ≦ M. The existence of the first division rib can enhance the mechanical strength of the rotor, enhance the safety and reliability of the motor, limit the size range of the rib and prevent excessive magnetic leakage.

In some embodiments, the second filling groove 52 is composed of a plurality of grooves that are not connected, and a second dividing rib 82 is disposed between two adjacent grooves, the second dividing rib 82 is in a uniform width structure or a non-uniform width structure, the uniform width structure is in a rectangular shape or a parallelogram shape, and the non-uniform width structure is in a trapezoid shape, preferably a rectangular dividing rib in the uniform width structure. With this arrangement, the structural strength can be enhanced while reducing the magnetic flux leakage as much as possible.

In some embodiments, the width h1 of the rib between the outer circle of the rotor and each of the first filling groove 51 and the second filling groove 52, and the rib with the smallest width among the first divided ribs 8 and the second divided ribs 82 satisfies h1 ≧ 0.5 σ, where σ is the width of the air gap between the inner diameter of the stator of the motor and the outer diameter of the rotor. The segmentation ribs in the areas on the rotor mainly enhance the structural strength of the rotor, and are not suitable to be too small, otherwise, the rotor is at risk of deformation when the motor runs.

In some embodiments, the ratio of the length d1 of the first filling groove 51 at the two ends of the outermost slit groove 6 in the d-axis direction to the length d2 of the first filling groove 51 at the two ends of the adjacent slit groove 6 in the d-axis direction satisfies 0.2 ≦ d1/d2 ≦ 0.9, and more preferably 0.45 ≦ d1/d2 ≦ 0.65.

In some embodiments, the ratio of the length d1 of the first filling groove 51 in the d-axis direction at both ends of the slit groove 6 at the outermost layer to the length d3 of the first filling groove 51 in the d-axis direction at both ends of the slit groove 6 at the innermost layer satisfies 0.1. ltoreq. d1/d 3. ltoreq.0.7, more preferably 0.3. ltoreq. d1/d 3. ltoreq.0.5. The length of the first filling groove along the d-axis direction is set within the range, so that the area of the first filling groove can be ensured, the area of the first filling groove is not too large or too small, the filling material is increased and wasted due to the too large area, and the starting performance of the motor is affected due to the too small area.

In some embodiments, the long sides of both end portions of some or all of the slit grooves 6 are parallel to the d-axis; by the arrangement, the space inside the rotor can be fully utilized, and more slit grooves can be arranged on the rotor;

the slit groove 6 includes at least one of a linear groove and an arc-shaped groove; when part of the slit groove is a combination of a straight line groove and an arc-shaped groove, the slit groove is composed of a straight line section, an arc line section and a straight line section, the straight line section is parallel to the d axis, and the arc line section protrudes towards the direction far away from the shaft hole; when part of the slit grooves are arc-shaped grooves, the arc line segments protrude towards the side far away from the shaft hole; when the partial slit groove is a straight groove, the long side of the straight groove is arranged parallel to the d-axis and is located closest to the second filling groove (i.e., located between the second filling groove and the special-shaped groove); the setting can also ensure the space utilization rate on the rotor, and is favorable for the smoothness of a magnetic circuit structure on the rotor, thereby better utilizing the reluctance torque.

In some embodiments, the slit grooves 6 are composed of arc line segments and/or straight line segments, the arc degree of the arc line segments of the slit grooves 6 becomes gradually larger from the rotor shaft hole side to the rotor outer circle side, and the outer arc degree of the slit grooves 6 in the same layer is larger than or equal to the inner arc degree. The shaft hole is formed in the middle of the rotor, the slit groove is arranged in such a way, the utilization rate of the rotor space can be increased, the salient pole ratio of the rotor structure is improved, and therefore the reluctance torque of the motor is improved.

In some embodiments, the widths of the slit grooves in at least 3 layers of the slit grooves 6 are gradually decreased from the radially inner side to the radially outer side at intermediate positions. The arrangement is to reasonably arrange the position of the slit groove.

In some embodiments, the sum of the widths of all the slit grooves and the second filling grooves 52 is Σ m2+ m1, the radial width from the outer circle of the first shaft hole to the outer circumference of the rotor is m3, Σ m2+ m1/m3 is 0.2 to 0.5, more preferably 0.3 to 0.4. The purpose is that select reasonable magnetic barrier to account for than, can enough guarantee the magnetic barrier width, guarantee reasonable magnetic flow passageway again, when increasing the motor salient pole ratio, prevent the magnetic circuit supersaturation, further reduce magnetic field harmonic.

In some embodiments, the distance between arcs on the first rotor sheet 4 on both sides of the first shaft hole 7 in the q-axis direction between two innermost slit grooves 6 on both sides of the first shaft hole 7 is S3, the diameter of the first shaft hole 7 is d, and S3/d is 1.2-1.3, and the diameter of an inner arc of the innermost slit groove is 1.5-3 times the diameter d of the first shaft hole 7. So set up, guarantee that the magnetic conduction passageway between inlayer slot and the shaft hole has enough region, just can avoid magnetic conduction passageway magnetic saturation to appear, guarantee simultaneously that rotor structural strength is within safety range.

In some embodiments, the distance between two adjacent first filling grooves 51 on the first rotor sheet 4 is S1, and S1 ≧ S2 is satisfied, where S2 is the distance in the q-axis direction at any position in two slit grooves 6 opposite to the two adjacent first filling grooves. So set up, also in order to guarantee the unobstructed of rotor magnetic channel, avoid the saturation.

In some embodiments, the total area of all of the first and second filling grooves comprises 30% to 70% of the total area of all rotor grooves, including the first filling grooves, the second filling grooves and the slit grooves, more preferably 35% to 50%. The purpose is to ensure a certain proportion of the area of the filling groove, so that the motor has certain on-load starting capability.

In some embodiments, the included angle α 1 between the two ends of the second filling groove 52 and the connecting line of the rotor center satisfies 20 ° ≦ α 1 ≦ 60 °; the second filled slot may act as a magnetic barrier layer, increasing the reluctance difference between the d and q axes of the motor, thereby increasing the motor reluctance torque.

The deviation of the inclination angle between the extending direction of the first filling groove and the d axis is not more than 5 degrees, and the deviation of the inclination angle between the extending direction of the second filling groove 52 and the d axis is not more than 5 degrees;

the distance from the middle point of the first filling groove 51 of at least three layers to the middle point of the first filling groove 51 of the outer layer adjacent to the middle point is gradually increased towards the outer side;

the width of the first filling groove 51 in the same layer deviates from the inside to the outside along the d-axis direction by not more than 5%;

the widths of the first filling grooves of the at least three layers of the first filling grooves 51 decrease continuously from the inside to the outside in the direction of the q-axis;

by the arrangement, the rotor space can be fully utilized, so that the magnetic density distribution on the rotor is uniform, the use of filling materials can be properly reduced under the condition of not influencing the starting capability, and the aim of reducing the manufacturing cost is fulfilled.

The ratio of the width of at least 3 layers of the first filling grooves to the width of the slit grooves in the same layer from inside to outside along the direction of the q axis is more than 1.4, preferably 1.5-3.0; the area of at least 3 layers of first filling grooves is gradually reduced from inside to outside along the direction of the q axis, and the area reduction amplitude is gradually enlarged, wherein the area reduction amplitude is defined as the ratio of the areas of the first filling grooves of the two adjacent layers.

With the arrangement, the space position in the middle area of the slit groove is small by combining the characteristics of the rotor magnetic circuit structure, the width of the middle position of the slit groove can be properly reduced, and the space of the position of the first filling groove is large, so that the width of the first filling groove can be designed to be relatively large.

The first rotor punching sheet at least comprises 5 filling grooves with different areas.

In some embodiments, the first filling grooves 51 are filled with an electrically and magnetically conductive material, preferably aluminum or aluminum alloy, and all the filling grooves are connected by self-short-circuiting through end rings at both ends of the rotor to form a squirrel cage structure, and the material of the end rings is the same as that of the first filling grooves 51.

The aluminum has good conductivity, relatively low market price and is suitable for being applied to the field of industrial motors; the self-short-circuited squirrel-cage structure provides asynchronous torque in the starting stage of the motor so as to realize the self-starting of the motor.

Air is filled in part or all of the second filling grooves 52, and the conductive and non-conductive material is prevented from being filled by the blocking of the second rotor punching sheet 2.

In some embodiments, a magnetic conduction channel exists between two adjacent magnetic barrier layer structures, the width of the tail end of each magnetic conduction channel is larger than that of the center of each magnetic conduction channel, and a filling groove is not arranged in the middle area of any magnetic conduction channel; to ensure the smoothness of the magnetic conduction channel

The width of the middle of at least three layers of magnetic conduction channels gradually decreases from inside to outside along the direction of the q axis;

the width of any one magnetic conduction channel is gradually increased from the middle to two sides, wherein the width of the magnetic conduction channel is defined as the shortest distance from any point on one arc line to the other arc line.

So set up, also in order to guarantee the unobstructed of magnetic conduction passageway to make full use of reluctance torque.

The invention also provides an electric machine comprising a self-starting synchronous reluctance machine rotor as defined in any one of the preceding claims.

The invention provides a self-starting synchronous reluctance motor rotor structure, which realizes the self-starting of a motor through asynchronous torque provided by a rotor conducting bar, solves the problem that the synchronous reluctance motor needs to be driven by a frequency converter, reduces the loss of the motor and improves the efficiency of the motor;

the invention provides a self-starting synchronous reluctance motor rotor structure which can effectively reduce magnetic field harmonic waves generated when a motor runs and improve the problems of torque pulse rate and vibration noise of the motor.

Through the combined design of the filling groove and the slit groove, the synchronous reluctance motor can realize self-starting, the loss of a controller is saved, and the efficiency of the motor is improved.

Through the shape and position design of the slit groove and the filling groove on the first rotor punching sheet and the second rotor punching sheet, the magnetic field harmonic wave is effectively reduced, and the problems of torque pulsation and vibration noise caused by the harmonic wave are avoided.

Through the structural design of the second rotor punching sheet and the size design of the segmentation ribs between the rotor filling grooves and the slit grooves, the mechanical strength of the rotor can be enhanced.

The invention also provides a compressor which comprises the motor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several 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 (30)

1. A self-starting synchronous reluctance motor rotor is characterized in that:

the rotor punching sheet structure comprises a rotor core (1) and an end ring (3), wherein the rotor core (1) comprises a first rotor punching sheet (4) and a second rotor punching sheet (2), a first filling groove (51), a second filling groove (52) and a slit groove (6) are arranged on the first rotor punching sheet (4), the first filling groove (51) and the slit groove (6) are arranged in the same layer, and the second filling groove (52) is located on the outermost layer of the rotor q-axis direction and is not in the same layer as the slit groove (6); the second rotor punching sheet (2) can cover the second filling groove (52) on the first rotor punching sheet (4) completely or partially.

2. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

a third filling groove (21) is formed in the second rotor punching sheet (2), the third filling groove (21) is arranged opposite to the first filling groove (51), a fourth filling groove (22) is formed in the second rotor punching sheet (2) or no fourth filling groove (22) is formed in the second rotor punching sheet, when the fourth filling groove (22) is formed, the fourth filling groove (22) is opposite to the second filling groove (52), and the number of the fourth filling groove (22) is smaller than that of the second filling groove (52), so that the second filling groove (52) is partially covered; when the fourth filling groove (22) is not arranged, the second rotor punching sheet (2) can completely cover the position of the second filling groove (52).

3. The self-starting synchronous reluctance machine rotor of claim 2, wherein:

the second filling groove (52) is composed of an integral groove or a plurality of segmented grooves, and when the second filling groove (52) is composed of an integral groove, a fourth filling groove (22) is not arranged at the position, opposite to the second filling groove (52), of the second rotor punching sheet (2); when the second filling groove (52) is composed of a plurality of segmented grooves, the segmented grooves are communicated into a whole, no fourth filling groove or at least one fourth filling groove is arranged at the position, opposite to the second filling groove (52), on the second rotor punching sheet (2), wherein at least one fourth filling groove (22) is opposite to or not opposite to part of the second filling groove (52) so as to shield the second filling groove (52) partially or completely.

4. The self-starting synchronous reluctance machine rotor of claim 2, wherein:

the central point of first rotor punching (4) puts and sets up first shaft hole (7), the central point of second rotor punching (2) puts and sets up second shaft hole (20), second shaft hole (20) with first shaft hole (7) set up relatively.

5. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the first rotor punching sheet (4) and the second rotor punching sheet (2) are overlapped and pressed, the second rotor punching sheet (2) is located at the two axial ends of the rotor core (1), and the axial overlapping height of the second rotor punching sheet (2) at each end is not smaller than the thickness of the single first rotor punching sheet (4).

6. The self-starting synchronous reluctance machine rotor of claim 2, wherein:

the length, the width or the area of part or all of the filling grooves on the second rotor punching sheet are not larger than the filling grooves at the same positions on the first rotor punching sheet, the filling grooves on the second rotor punching sheet comprise a third filling groove and a fourth filling groove, and the filling grooves on the first rotor punching sheet comprise a first filling groove and a second filling groove.

7. The self-starting synchronous reluctance machine rotor of claim 4, wherein:

the maximum width of the outer contour of the second rotor punching sheet (2) is not larger than the diameter of the outer circle of the first rotor punching sheet (4), the second shaft hole (20) of the second rotor punching sheet (2) is in an elliptical shape, the major axis of the ellipse is located on the q axis, the minor axis of the ellipse is located on the d axis, and the length ratio k1/k2 of the major axis to the minor axis ranges from 1.1 to 1.5.

8. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the width kd of the second rotor punching sheet (2) on the d axis is larger than the width kq of the second rotor punching sheet on the q axis, and kd/kq is more than or equal to 1.1 and less than or equal to 2.8.

9. The self-starting synchronous reluctance machine rotor of claim 4, wherein:

along the direction of a d axis, the width distance from the inner edge of the second shaft hole (20) of the second rotor punching sheet (2) to the third filling groove (21) is more than 1 time of the width distance of a first dividing rib (8) at the position of the first rotor punching sheet opposite to the inner edge, and the first dividing rib (8) is positioned between the slit groove (6) and the first filling groove (51).

10. The self-starting synchronous reluctance machine rotor of claim 4, wherein:

the area of the plurality of slit grooves (6) in the area of the first rotor punching sheet (4) opposite to the second shaft hole (20) of the second rotor punching sheet (2) is gradually reduced along the direction of the d shaft outwards.

11. The self-starting synchronous reluctance machine rotor of claim 4, wherein:

the total area of the plurality of slit grooves (6) in the area of the first rotor punching sheet (4) opposite to the second shaft hole (20) of the second rotor punching sheet (2) accounts for at least 40% of the total area of the motor flow hole; the total area of the motor flow holes comprises the sum of the area of the stator flow holes and the area of the rotor flow holes.

12. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the maximum width of the outer contour of the end ring (3) is not more than the maximum width of the outer contour of the second rotor punching (2), and the maximum distance from the center of the rotor core (1) to the end face of the end ring (3) along the axial direction is not less than the maximum distance from the center of the rotor core (1) to the end face of the second rotor punching (2); and/or the presence of a gas in the gas,

the end ring (3) is of an unequal-width structure, the width md of the end ring along the d-axis direction is greater than the width mq along the q-axis direction, and md/mq is more than or equal to 1.1 and less than or equal to 2.8.

13. The self-starting synchronous reluctance machine rotor of claim 2, wherein:

when the second rotor punching sheet (2) is not provided with a fourth filling groove (22), the first filling groove (51) and the slit groove (6) on the first rotor punching sheet (4) jointly form a multilayer magnetic barrier layer structure of the rotor;

when a fourth filling groove (22) is formed in the second rotor punching sheet (2), the first filling groove (51), the slit groove (6) and the second filling groove (52) in the first rotor punching sheet (4) jointly form a multilayer magnetic barrier layer structure of the rotor.

14. The self-starting synchronous reluctance machine rotor of claim 13, wherein:

in each magnetic barrier layer structure consisting of a first filling groove and a slit groove, a first dividing rib (8) is arranged between the first filling groove and the slit groove, the width L of the first dividing rib on the same layer along the d-axis direction, the width of the end part, connected with the first dividing rib, of the first filling groove (51) arranged on the same layer with the first dividing rib is M, the width between L and M is more than 0.2M and less than 0.35M, the width of the end part, close to the first dividing rib (8), of the slit groove (6) arranged on the same layer with the first dividing rib is K, and the width between K and M is less than or equal to M.

15. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the second filling groove (52) is composed of a plurality of grooves which are not communicated, a second division rib (82) is arranged between every two adjacent grooves, the second division rib (82) is of an equal-width structure or an unequal-width structure, the equal-width structure is a rectangle or a parallelogram and the like, and the unequal-width structure is a trapezoid.

16. The self-starting synchronous reluctance machine rotor of claim 15, wherein:

the width h1 of the rib between all the first filling grooves (51) and all the second filling grooves (52) and the outer circle of the rotor, and the rib with the smallest width in the first division ribs (8) and the second division ribs (82) meets the condition that h1 is more than or equal to 0.5 sigma, wherein sigma is the width of an air gap between the inner diameter of the motor stator and the outer diameter of the rotor.

17. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the ratio of the length d1 of the first filling groove (51) at the two ends of the outermost slit groove (6) along the d-axis direction to the length d2 of the first filling groove (51) at the two ends of the adjacent slit groove (6) along the d-axis direction satisfies 0.2-0. 1/d 2-0.9.

18. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the ratio of the length d1 of the first filling groove (51) at the two ends of the slit groove (6) at the outermost layer along the d-axis direction to the length d3 of the first filling groove (51) at the two ends of the slit groove (6) at the innermost layer along the d-axis direction satisfies 0.1-d 1/d 3-0.7.

19. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the long sides of the two end parts of part or all of the slit grooves (6) are parallel to the d axis; the slit groove (6) comprises at least one of a linear groove and an arc-shaped groove; when part of the slit groove is a combination of a straight line groove and an arc-shaped groove, the slit groove is composed of a straight line section, an arc line section and a straight line section, the straight line section is parallel to the d axis, and the arc line section protrudes towards the direction far away from the shaft hole; when part of the slit grooves are arc-shaped grooves, the arc line segments protrude towards the side far away from the shaft hole; when the partial slit groove is a straight groove, the long side of the straight groove is arranged parallel to the d-axis and is located closest to the second filling groove.

20. The self-starting synchronous reluctance machine rotor of claim 19, wherein:

the slot groove (6) is composed of arc line segments and/or straight line segments, the radian of the arc line segments of the slot groove (6) is gradually increased from the rotor shaft hole side to the rotor excircle side, and the radian of the outer arcs of the slot grooves (6) on the same layer is larger than or equal to that of the inner arcs.

21. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the widths of the slit grooves in the middle positions of at least 3 layers of the slit grooves (6) are gradually reduced from the radial inner side to the radial outer side.

22. The self-starting synchronous reluctance machine rotor of claim 4, wherein:

the sum of the widths of all the slit grooves and the second filling grooves (52) is sigma m2+ m1, the radial width from the outer circle of the first shaft hole to the outer circumference of the rotor is m3, and (sigma m2+ m1)/m3 is 0.2-0.5.

23. The self-starting synchronous reluctance machine rotor of claim 4, wherein:

in two innermost layer slit grooves (6) on the first rotor punching sheet (4) and located on two sides of the first shaft hole (7), the distance between arcs close to the first shaft hole (7) side and the distance between the arcs along the q-axis direction is S3, the diameter of the first shaft hole (7) is d, S3/d is 1.2-1.3, and the diameter of an inner arc of the innermost layer slit groove is 1.5-3 times of the diameter d of the first shaft hole (7).

24. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the distance between two adjacent first filling grooves (51) on the first rotor punching sheet (4) is S1, S1 is more than or equal to S2, wherein S2 is the distance along the q-axis direction at any position of two slit grooves (6) opposite to the two adjacent first filling grooves.

25. The self-starting synchronous reluctance machine rotor of claim 1, wherein:

the total area of all the first filling grooves and the second filling grooves accounts for 30 to 70 percent of the total area of all the rotor grooves, including the first filling grooves, the second filling grooves and the slit grooves.

26. A self-starting synchronous reluctance machine rotor according to any one of claims 1 to 25, wherein:

the included angle alpha 1 between the two ends of the second filling groove (52) and the connecting line of the centers of the rotors meets the condition that alpha 1 is more than or equal to 20 degrees and less than or equal to 60 degrees;

the deviation of the inclination angle between the extending direction of the first filling groove and the d axis is not more than 5 degrees, and the deviation of the inclination angle between the extending direction of the second filling groove (52) and the d axis is not more than 5 degrees;

the distance between the middle point of the first filling groove (51) of at least three layers and the middle point of the first filling groove (51) of the outer layer adjacent to the middle point of the first filling groove is gradually increased towards the outer side;

the width of the first filling groove (51) on the same layer deviates from the inside to the outside along the d-axis direction by not more than 5%;

the widths of the first filling grooves of the at least three layers of the first filling grooves (51) continuously decrease from inside to outside along the direction of the q-axis;

the ratio of the width of at least 3 layers of the first filling grooves to the width of the middle position of the slit groove on the same layer from inside to outside along the direction of the q axis is more than 1.4;

the area of at least 3 layers of first filling grooves is gradually reduced from inside to outside along the direction of the q axis, and the amplitude of the area reduction is gradually enlarged, wherein the amplitude of the area reduction is defined as the ratio of the areas of the first filling grooves of the two adjacent layers;

the first rotor punching sheet at least comprises 5 filling grooves with different areas.

27. A self-starting synchronous reluctance machine rotor according to any one of claims 1 to 26, wherein:

the grooves of the first filling grooves (51) are filled with conductive and non-magnetic materials, all the filling grooves are in self-short circuit connection through end rings at two ends of the rotor to form a squirrel cage structure, and the end ring materials are the same as the filling materials in the first filling grooves (51);

air is filled in part or all of the second filling grooves (52), and the second rotor punching sheet (2) is blocked to prevent the conductive and non-conductive material from being filled.

28. The self-starting synchronous reluctance machine rotor of claim 13, wherein:

magnetic conduction channels are arranged between every two adjacent magnetic barrier layer structures, the width of the tail ends of all the magnetic conduction channels is larger than that of the centers of the magnetic conduction channels, and no filling groove is arranged in the middle area of any magnetic conduction channel;

the width of the middle of at least three layers of magnetic conduction channels gradually decreases from inside to outside along the direction of the q axis;

the width of any one magnetic conduction channel is gradually increased from the middle to two sides, wherein the width of the magnetic conduction channel is defined as the shortest distance from any point on one arc line to the other arc line.

29. An electrical machine comprising a self-starting synchronous reluctance machine rotor according to any one of claims 1 to 28.

30. A compressor comprising the motor of claim 29.

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