Self-starting synchronous reluctance motor rotor and self-starting synchronous reluctance motor

Abstract

The application provides a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor. The self-starting synchronous reluctance motor rotor comprises a rotor core, air slots are formed on the rotor core to form magnetic barrier layers, and a part between two adjacent magnetic barrier layers is a magnetic flux conducting channel; the magnetic flux conducting channel comprises a parallel section segment parallel to a D-axis and a non-parallel section segment not parallel to the D-axis, a width of the non-parallel section segment along a radial direction of the rotor core is W R , and in the non-parallel section segment of the same magnetic flux conducting channel, a width of a widest part of the non-parallel section segment is W Rmax , a width of a narrowest part of the non-parallel section segment is W Rmin , and |W Rmax -W Rmin |≤20mm; and according to the application, the magnetic circuit can be ensured to be uniform in magnetic resistance when passing through each layer of the magnetic flux conducting channel, local saturation or early saturation can be avoided, the rated load and heavy load performance of the motor can be improved, the overload capacity can be improved, and the torque output, the overload capacity and the overall efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor. Background Art

[0002] The self-starting synchronous reluctance motor has the characteristics of both asynchronous motor and synchronous reluctance motor, and has the following basic features:

[0003] Air slots are opened in the rotor along the axial direction. These air slots are called magnetic barrier slots. The core part formed between every two layers of magnetic barrier slots is called magnetic channel.

[0004] The magnetic barrier slot is fully or partially filled with conductive non-magnetic material (such as aluminum), which is called a conductive bar;

[0005] There are end rings at both ends of the rotor axial direction. The material of the end rings is the same as that of the guide bars. The end rings at both ends of the rotor are connected to all or part of the guide bars in the rotor slots to form a short circuit loop.

[0006] Self-starting synchronous reluctance motors combine the advantages of asynchronous motors—direct starting without an inverter, lack of rotor magnets, and high reliability—with the stable operation, high efficiency, and high power density of synchronous reluctance motors. In the industrial sector, this represents a breakthrough in fixed-frequency motors' IE4 energy efficiency, while also offering lower costs.

[0007] The rotor of the self-starting synchronous reluctance motor is provided with multiple layers of air slots. The middle part between two adjacent air slots is a magnetic channel. The magnetic channel starts from the part parallel to the D axis, passes through the part not parallel to the D axis (the part is perpendicular to the Q axis when passing through the Q axis, or the tangent of the arc is perpendicular to the Q axis), and finally ends at the part parallel to the D axis that is symmetrical about the starting part.

[0008] Since the D-axis magnetic circuit has no axial hole restriction and the Q-axis magnetic circuit has axial hole restriction, the available space for the two magnetic channels is limited, resulting in the Q-axis magnetic channel being farther away from the D-axis than the D-axis magnetic channel and the Q-axis magnetic channel being narrower.

[0009] The magnetic channel is the main part of the motor's main magnetic circuit in the rotor. The width of the magnetic channel, the distribution of each layer of magnetic channels, and the smoothness of the transition between the D-axis and Q-axis parts of each layer of magnetic channels will affect the motor's torque output, overload capacity, and efficiency.

[0010] Since the self-starting synchronous reluctance motor in the prior art has technical problems such as low torque output, low overload capacity and low overall efficiency, the present invention studies and designs a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor. Summary of the Invention

[0011] Therefore, the present application aims to solve the technical problem of overcoming the defects of small torque output, small overload capacity and low efficiency of the self-starting synchronous reluctance motor in the prior art, thereby providing a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor.

[0012] To solve the above problems, the present application provides a self-starting synchronous reluctance motor rotor, comprising:

[0013] A rotor core, wherein air slots are formed on the rotor core to form magnetic barrier layers, and a portion between two adjacent magnetic barrier layers is a magnetic flux guide channel; the magnetic flux guide channel comprises parallel sections parallel to the D-axis and non-parallel sections not parallel to the D-axis, the width of the non-parallel sections along the radial direction of the rotor core is W R , and in the same non-parallel section of the magnetic flux guide channel, the width of the widest part of the non-parallel section is W Rmax , the width of the narrowest part of the non-parallel section is W Rmin , and |W Rmax -W Rmin |≤20mm; and

[0014] In some embodiments, the width of each parallel section in the same magnetic flux guide channel is equal.

[0015] In some embodiments, in the same magnetic flux guide channel, the position where the parallel section meets the non-parallel section is a smooth transition structure.

[0016] In some embodiments, in the same magnetic flux guide channel, the position where the parallel section meets the non-parallel section is a non-smooth transition structure.

[0017] In some embodiments, in the magnetic flux guide channel, the non-parallel section comprises a Q-axis magnetic flux guide section at the Q-axis, and further comprises a transition section, one end of the transition section is connected to the Q-axis magnetic flux guide section, and the other end of the transition section is connected to the parallel section, and the transition section is a circular arc structure.

[0018] In some embodiments, in the magnetic flux guide channel, the non-parallel section comprises a Q-axis magnetic flux guide section at the Q-axis, and further comprises a transition section, one end of the transition section is connected to the Q-axis magnetic flux guide section, and the other end of the transition section is connected to the parallel section, and the transition section is a multi-section structure.

[0019] In some embodiments, the rotor core is axially stacked by rotor lamination.

[0020] In some embodiments, the magnetic barrier layers are filled with electrically conductive and magnetically non-conductive material, i.e., a conducting bar.

[0021] In some embodiments, the rotor core has end rings of electrically conductive non-magnetic material placed at the axial ends of the rotor core, and all or part of the conductive bars are short-circuited together through the end rings to form a loop.

[0022] The application also provides a self-starting synchronous reluctance motor rotor comprising any one of the self-starting synchronous reluctance motor rotors described above.

[0023] The self-starting synchronous reluctance motor rotor and the self-starting synchronous reluctance motor provided by the application have the following beneficial effects:

[0024] In the non-parallel section of the same magnetic flux channel, the non-parallel section is not of equal width, the width of the widest part is W Rmax , and the width of the narrowest part is W Rmin , and |W Rmax -W Rmin |≤20mm; and The relationship between the maximum width and the minimum width of the magnetic flux channel is constrained, the maximum width and the minimum width of the magnetic flux channel are constrained in the above specific range, the width of the entire magnetic flux channel is effectively ensured to be uniform from the starting section to the ending section, the magnetic resistance is ensured to be uniform when the magnetic circuit passes through each layer of the magnetic flux channel, local saturation or early saturation is avoided, and thus the rated load and the heavy load performance of the motor are improved, the overload capacity is improved, and thus the torque output, the overload capacity and the overall efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a schematic diagram of the magnetic barrier and the magnetic flux channel of the self-starting synchronous reluctance motor rotor of the application;

[0026] Figure 2 FIG. 2 is a specific structural diagram of the magnetic flux channel part of the self-starting synchronous reluctance motor rotor of the application;

[0027] Figure 3 FIG. 3 is a schematic diagram of the width of the magnetic flux channel of the self-starting synchronous reluctance motor rotor of the application;

[0028] Figure 4 FIG. 4 is a curve diagram of the comparison between the motor of the application and a conventional motor in terms of torque output / overload capacity;

[0029] Figure 5 FIG. 5 is a curve diagram of the comparison between the motor of the application and a conventional motor in terms of efficiency.

[0030] The reference signs are as follows:

[0031] 1, rotor core; 2, magnetic barrier layer; 3, magnetic flux channel; 31, parallel section; 32, non-parallel section; 33, Q-axis magnetic flux section; 34, transition section. DETAILED DESCRIPTION

[0032] like Figures 1-5 As shown, the present invention provides a self-starting synchronous reluctance motor rotor, which includes:

[0033] A rotor core 1 is provided with air slots to form a magnetic barrier layer 2, and a portion between two adjacent layers of the magnetic barrier layer 2 is a magnetic channel 3; the direction of high magnetic permeability is the D axis, and the direction of low magnetic permeability is the Q axis; two adjacent rotor poles are symmetrical about the D axis, and within the same pole are symmetrical about the Q axis; according to the shape of the magnetic barrier layer 2, the D axis is an axis parallel to the magnetic barrier layer in the radial direction of the rotor core, and the Q axis is an axis perpendicular to the magnetic barrier layer in the radial direction of the rotor core; the magnetic barrier layer 2 has multiple layers along the Q axis, and the magnetic channel 3 includes a parallel segment 31 parallel to the D axis and a non-parallel segment 32 not parallel to the D axis, and the width of the non-parallel segment 32 along the radial direction of the rotor core 1 is W R , and in the non-parallel section 32 of the same magnetic channel 3, the width of the widest part of the non-parallel section 32 is W Rmax The width of the narrowest part of the non-parallel section 32 is W Rmin , and has |W Rmax -W Rmin |≤20mm; and

[0034] In the non-parallel sections of the same magnetic channel, the width of the non-parallel sections is different, and the width of the widest section is W. Rmax , the width of the narrowest part is W Rmin , and has |W Rmax -W Rmin |≤20mm; and It can constrain the relationship between the maximum width and the minimum width of the magnetic channel, constrain the maximum width and the minimum width of the magnetic channel within the above-mentioned specific range, effectively ensure that the width of the entire magnetic channel is uniform from the starting section to the ending section, and ensure that the magnetic resistance of the magnetic circuit is uniform when passing through each layer of the magnetic channel, avoiding local saturation or premature saturation, thereby improving the rated load and heavy-load performance of the motor, improving the overload capacity, and thus improving the torque output, overload capacity and overall machine efficiency.

[0035] The present invention sets the width of the magnetic channel and constrains the relationship between the maximum width and the minimum width of the magnetic channel to ensure that the width of the entire magnetic channel from the starting section to the ending section is uniform, thereby improving torque output, overload capacity and overall machine efficiency.

[0036] 1. Define the width of the magnetic channel, constrain the ratio of the maximum width to the minimum width of the magnetic channel, and the maximum difference between the maximum width and the minimum width;

[0037] 2. D-axis flux guide channel is parallel to D-axis.

[0038] In some embodiments, the width of each parallel section 31 in the same flux guide channel 3 is equal. By setting the parallel sections of the same flux guide channel to have equal width, the magnetic circuits can be effectively balanced, so that the magnetic fields between the magnetic circuits are equal in size, making the magnetic field distribution uniform across the entire rotor, further ensuring that the magnetic resistance is uniform when the magnetic circuit passes through each layer of flux guide channel, avoiding local saturation or premature saturation, thereby improving the motor's rated load and heavy load performance, and improving the overload capacity.

[0039] 1. Rotor magnetic barrier: each layer of air slot opened on the rotor;

[0040] 2. Rotor flux guide channel: the part between each layer of air slot on the rotor is called flux guide channel layer;

[0041] 3. Conductor bar: conductive and non-magnetic material filled in the rotor air slot;

[0042] 4. End ring: set at both ends of the rotor, made of the same material as the conductor bar and forms a loop with the rotor conductor bar short circuit;

[0043] 5. D-axis flux guide channel (parallel section 31): the part of the flux guide channel parallel to the D-axis;

[0044] 6. Q-axis flux guide channel (Q-axis flux guide section 33): the part of the flux guide channel not parallel to the D-axis and parallel to the Q-axis.

[0045] In some embodiments, in the same flux guide channel 3, the position where the parallel section 31 meets the non-parallel section 32 is a smooth transition structure. By setting the joint between the parallel section and the non-parallel section as a smooth transition structure, the invention can ensure that the magnetic circuit can produce a smooth and natural transition when passing from the parallel section to the non-parallel section or vice versa, preventing the occurrence of large magnetic resistance and reducing magnetic flux loss.

[0046] 1. Non-parallel D-axis flux guide channel (non-parallel section 32), the width in the radial direction is WR, this part of the flux guide channel is not equal in width, the widest part W rmax of each layer of flux guide channel rmin , the narrowest part W Rmax , |W Rmin -W |≤20mm;

[0047] 2. D-axis flux guide channel (parallel section 31) is equal in width;

[0048] 3. The parallel D-axis portion (parallel portion segment 31) to the non-parallel D-axis portion (non-parallel portion segment 32) of each layer magnetic conduction channel can adopt a smooth transition or a non-smooth transition;

[0049] The above ensures that the magnetic resistance is uniform when the magnetic path passes through each layer magnetic conduction channel, avoiding local saturation or premature saturation, thereby improving the rated load and overload performance of the motor and improving the overload capacity.

[0050] In some embodiments, the position where the parallel portion segment 31 and the non-parallel portion segment 32 meet in the same magnetic conduction channel 3 is a non-smooth transition structure. The present application can ensure the normal flow of the magnetic path by setting the position where the parallel portion segment and the non-parallel portion segment meet as a non-smooth transition structure.

[0051] In some embodiments, the non-parallel portion segment 32 in the magnetic conduction channel 3 includes a Q-axis magnetic conduction segment 33 located at the Q-axis, and the non-parallel portion segment 32 further includes a transition segment 34 connected to the Q-axis magnetic conduction segment 33 at one end and to the parallel portion segment 31 at the other end, and the transition segment 34 is a circular arc structure. The present application can form a smooth magnetic flux flow path by setting the transition segment between the Q-axis magnetic conduction segment in the non-parallel portion segment and the non-parallel portion segment as a circular arc structure, preventing the occurrence of a large magnetic resistance, and reducing magnetic flux loss.

[0052] In some embodiments, the non-parallel portion segment 32 in the magnetic conduction channel 3 includes a Q-axis magnetic conduction segment 33 located at the Q-axis, and the non-parallel portion segment 32 further includes a transition segment 34 connected to the Q-axis magnetic conduction segment 33 at one end and to the parallel portion segment 31 at the other end, and the transition segment 34 is a multi-segment structure. The present application can form a smooth magnetic flux flow path by setting the transition segment between the Q-axis magnetic conduction segment in the non-parallel portion segment and the non-parallel portion segment as a multi-segment structure, preventing the occurrence of a large magnetic resistance, and reducing magnetic flux loss.

[0053] In some embodiments, the rotor core 1 is formed by axially stacking rotor laminations; the number of groups of the magnetic barrier layer 2 is equal to the number of poles of the motor rotor, as shown in the drawings of the present disclosure, including 2 poles above and below the D-axis, i.e. 2 poles above and below the D-axis.

[0054] In some embodiments, the magnetic barrier layer 2 is filled with electrically conductive and magnetically non-conductive material, i.e. a conducting strip.

[0055] Preferably, the conducting strip is a cast aluminum structure formed in the filling groove by casting.

[0056] In some embodiments, the rotor core 1 is provided with end rings made of electrically conductive and magnetically non-conductive material at the axial ends of the rotor core 1, and all or part of the conductive bars are short-circuited together through the end rings to form a loop.

[0057] The motor of the present application is formed by a rotor core of rotor lamination axially stacked;

[0058] The rotor core is provided with a plurality of groups of identical air slots, and the number of groups of air slots is equal to the number of rotor poles.

[0059] Each layer of air slots on the rotor is referred to as a magnetic barrier layer 2, and the portion between adjacent two layers of air slots is referred to as a magnetic flux channel 3.

[0060] All the air slots are filled with electrically conductive and magnetically non-conductive material, referred to as conductive bars (not shown).

[0061] End rings (not shown) made of electrically conductive and magnetically non-conductive material are placed at the two ends of the rotor.

[0062] All or part of the conductive bars are short-circuited together through the end rings to form a loop.

[0063] The air slots are divided into multiple layers along the Q-axis, and according to the shape of the air slots, the radial direction parallel to the air slots is referred to as the D-axis, and the radial direction perpendicular to the air slots is referred to as the Q-axis.

[0064] Each layer of magnetic flux channels is divided into two parts, one part is parallel to the D-axis (parallel part segment 31), and the other part is not parallel to the D-axis (non-parallel part segment 32).

[0065] The present application also provides a self-starting synchronous reluctance motor rotor.

[0066] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be considered as the protection scope of the present application.

Claims

1. A self-starting synchronous reluctance motor rotor, characterized in that: include: A rotor core (1) is provided with air slots to form a magnetic barrier layer (2), and the portion between two adjacent layers of the magnetic barrier layer (2) is a magnetic channel (3); the direction of high magnetic permeability is the D axis, and the direction of low magnetic permeability is the Q axis; two adjacent rotor poles are symmetrical about the D axis, and the same pole is symmetrical about the Q axis; according to the shape of the magnetic barrier layer (2), the D axis is an axis parallel to the magnetic barrier layer in the radial direction of the rotor core (1), and the Q axis is an axis perpendicular to the magnetic barrier layer (2) in the radial direction of the rotor core (1); the magnetic barrier layer (2) has multiple layers along the Q axis; the magnetic channel (3) includes a parallel section (31) parallel to the D axis and a non-parallel section (32) not parallel to the D axis, and the width of the non-parallel section (32) along the radial direction of the rotor core (1) is W R , and in the non-parallel section (32) of the same magnetic channel (3), the width of the widest part of the non-parallel section (32) is W Rmax The width of the narrowest part of the non-parallel segment (32) is W Rmin , and has |W Rmax -W Rmin |≤20mm; and 2. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The widths of the parallel sections (31) in the same magnetic conductive channel (3) are all equal.

3. The self-starting synchronous reluctance motor rotor according to claim 2, characterized in that: In the same magnetic conductive channel (3), the position where the parallel section (31) and the non-parallel section (32) meet is a smooth transition structure.

4. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: In the same magnetic conductive channel (3), the position where the parallel section (31) and the non-parallel section (32) meet is a non-smooth transition structure.

5. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: In the magnetic conductive channel (3), the non-parallel section (32) includes a Q-axis magnetic conductive section (33) located at the Q-axis, and the non-parallel section (32) further includes a transition section (34), one end of the transition section (34) is connected to the Q-axis magnetic conductive section (33), and the other end is connected to the parallel section (31), and the transition section (34) is an arc-shaped structure.

6. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: In the magnetic conductive channel (3), the non-parallel section (32) includes a Q-axis magnetic conductive section (33) located at the Q-axis, and the non-parallel section (32) further includes a transition section (34), one end of the transition section (34) is connected to the Q-axis magnetic conductive section (33), and the other end is connected to the parallel section (31), and the transition section (34) is a multi-segmented structure.

7. The self-starting synchronous reluctance motor rotor according to any one of claims 1 to 6, characterized in that: The rotor core (1) is formed by axially stacking rotor punchings.

8. The self-starting synchronous reluctance motor rotor according to any one of claims 1 to 6, characterized in that: The magnetic barrier layer (2) is filled with conductive but non-magnetic material, namely conductive strips.

9. The self-starting synchronous reluctance motor rotor according to claim 8, characterized in that: End rings made of conductive and non-magnetic materials are placed at both axial ends of the rotor core (1), and all or part of the conductive bars are short-circuited together through the end rings to form a loop.

10. A self-starting synchronous reluctance motor, characterized in that: The invention comprises a self-starting synchronous reluctance motor rotor according to any one of claims 1 to 9.

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