A self-starting synchronous reluctance motor rotor and a 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, the rotor core is divided by a circle with a diameter DI, a part of the circle larger than the DI is an outer side of the rotor, a part of the circle smaller than the DI is an inner side of the rotor, and a ratio of a sum of widths of all magnetic barriers on the Q-axis located on the outer side of the rotor to a sum of widths of all rotor magnetic barriers on the Q-axis is: according to the application, the rotor Q-axis magnetic circuit can be reasonably designed and distributed, the area of the Q-axis filling slot on the outer side of the rotor is designed, the proportion of the Q-axis filling slot width on the outer side of the Q-axis in the Q-axis magnetic circuit is constrained, and the starting capability of the motor can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor. Background Technology

[0002] Self-starting synchronous reluctance motors combine the characteristics of both asynchronous motors and synchronous reluctance motors, and have the following basic features:

[0003] Air slots are formed along the axial direction inside the rotor. These air slots are called magnetic barrier slots. The iron core portion formed between every two layers of magnetic barrier slots is called a magnetic channel.

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

[0005] The rotor has end rings at both ends of the axial direction. The end rings are made of the same material as 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] Each pole of the rotor forms two symmetrical axes, the D-axis and the Q-axis. The axis that is approximately parallel to the magnetic channel is called the D-axis, and the axis that is approximately perpendicular to the magnetic channel is called the Q-axis.

[0007] Self-starting synchronous reluctance motors combine the advantages of asynchronous motors (no inverter required for direct starting, no magnets on the rotor, high reliability) with the advantages of synchronous reluctance motors (stable operation in sync, high efficiency, high power density). In industrial applications, they represent a breakthrough in energy efficiency for fixed-frequency motors (IE4) while also offering lower costs.

[0008] The starting process of a self-starting synchronous reluctance motor is divided into two parts: starting and pulling in. The starting stage mainly relies on the asynchronous torque generated by the rotor bars cutting the stator magnetic field lines. In the pulling in stage, the asynchronous torque is very small because the stator and rotor slip is close to 0, making pulling in difficult.

[0009] Increasing the area of ​​the filling slot can effectively increase the amount of conductor bars, reduce rotor resistance, and increase the pulling capacity. However, the filling slot will occupy the space of the magnetic channel, thus affecting the torque output and overload capacity. In particular, the rotor Q-axis space is tight, and the shaft hole also occupies part of the magnetic circuit.

[0010] Because existing self-starting synchronous reluctance motors have technical problems such as difficulty in starting, this 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 technical problem to be solved by the present invention is to overcome the defect of difficulty in starting 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 address the above problems, the present invention provides a self-starting synchronous reluctance motor rotor, comprising:

[0013] The rotor core has air slots to form a magnetic barrier layer. The rotor core includes a D-axis and a Q-axis. The magnetic barrier layer has multiple layers along the Q-axis, and the rotor core is divided into circles with a diameter DI. The portion of the circle larger than DI is the outer side of the rotor, and the portion smaller than DI is the inner side. Where D R The outer diameter of the rotor core;

[0014] The number of all the aforementioned magnetic barrier layers is 1 to N. B The number of magnetic barrier layers on the outer side of the rotor is n to N. B Where n≥1, the N B The number of all magnetic barrier layers in the rotor core under each pole;

[0015] The widths of all the magnetic barrier layers on the Q-axis are B q1 B q2 B qNB The widths of all the magnetic barrier layers located on the Q-axis outside the rotor are B, respectively. qn B qNB ;

[0016] The ratio of the sum of the widths of all magnetic barrier layers located outside the rotor on the Q-axis to the sum of the widths of all rotor magnetic barrier layers on the Q-axis is:

[0017] In some embodiments, the total magnetic circuit width on the Q-axis is Tq, and the sum of the widths of all the magnetic barrier layers on the Q-axis accounts for the proportion of the total magnetic circuit width on the Q-axis as follows:

[0018] In some embodiments, the rotor core further includes a shaft hole located radially inside it, where Tq is the radius of the rotor core minus the radius of the shaft hole.

[0019] In some embodiments, the rotor core is formed by axially stacking rotor laminations.

[0020] In some embodiments, the number of magnetic barrier layers is equal to the number of poles of the motor rotor.

[0021] In some embodiments, the magnetic barrier layer on the outer side of the rotor is a filled groove, and the magnetic barrier layer on the inner side of the rotor is a non-filled groove; and some or all of the filled grooves are filled with a conductive but non-magnetic material, i.e., a conductor bar.

[0022] In some embodiments, the guide bar is a cast aluminum structure, formed in the filling groove by casting.

[0023] In some embodiments, end rings made of conductive but non-magnetic material are placed at both ends of the rotor core along its axial direction, and all or part of the conductor bars are short-circuited together through the end rings to form a circuit.

[0024] In some embodiments, the portion between two adjacent magnetic barrier layers is a magnetic channel layer; the width of each magnetic channel layer on the Q axis is Wq1, Wq2, ..., Wqn.

[0025] The present invention also provides a self-starting synchronous reluctance motor, which includes the self-starting synchronous reluctance motor rotor described in any of the preceding claims.

[0026] The self-starting synchronous reluctance motor rotor and the self-starting synchronous reluctance motor provided by this invention have the following beneficial effects:

[0027] 1. The present invention sets the ratio of the sum of the widths of all magnetic barrier layers located outside the rotor on the Q-axis to the sum of the widths of all rotor magnetic barrier layers on the Q-axis as follows: This allows for the rational design and allocation of the rotor's Q-axis magnetic circuit, the design of the area of ​​the Q-axis filling slot on the outside of the rotor, and the constraint of the proportion of the width of the Q-axis filling slot on the outside of the rotor in the Q-axis magnetic circuit, which can effectively improve the motor's starting capability.

[0028] 2. The present invention further defines the proportion of the sum of the widths of all the magnetic barrier layers on the Q-axis to the total magnetic circuit width on the Q-axis as follows: It can constrain the proportion of Q-axis magnetic barriers in the Q-axis magnetic circuit, ensure that the shaft hole is as small as possible while ensuring structural strength, ensure sufficient magnetic conduction channels, and ensure unobstructed magnetic circuit, thereby effectively improving torque output. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the magnetic barrier and magnetic conduction channel of the rotor of the self-starting synchronous reluctance motor of the present invention;

[0030] Figure 2 This is a schematic diagram of the inner and outer portions of the rotor of the self-starting synchronous reluctance motor of the present invention.

[0031] Figure 3 This is a schematic diagram of the magnetic barrier layer width of the rotor of the self-starting synchronous reluctance motor of the present invention;

[0032] Figure 4 This is a graph showing the effect of the area of ​​the outer filling groove of the Q-axis rotor of the present invention on the starting capability.

[0033] Figure 5This is a graph showing the effect of the Q-axis magnetic barrier ratio on torque output according to the present invention.

[0034] Figure 6 This is a schematic diagram of the guide bar and end ring of the present invention.

[0035] The reference numerals in the attached figures are as follows:

[0036] 1. Rotor core; 11. Rotor outer side; 12. Rotor inner side; 13. Shaft hole; 2. Magnetic barrier layer; 21. Filling groove; 22. Unfilled groove; 3. Conductor bar; 4. End ring; 5. Magnetic channel layer. Detailed Implementation

[0037] like Figure 1-6 As shown, the present invention provides a self-starting synchronous reluctance motor rotor, which includes:

[0038] The rotor core 1 has air slots formed to create a magnetic barrier layer 2. Based on the shape of the magnetic barrier layer 2, the D-axis is the radial direction of the rotor core parallel to the magnetic barrier layer, and the Q-axis is the radial direction of the rotor core perpendicular to the magnetic barrier layer. The magnetic barrier layer 2 has multiple layers along the Q-axis, and the rotor core is divided into circles with a diameter DI. The portion of the circle larger than DI is the outer side 11 of the rotor, and the portion smaller than DI is the inner side 12 of the rotor. Where D R The outer diameter of the rotor core 1;

[0039] The number of all magnetic barrier layers 2 is 1 to NB, and the number of magnetic barrier layers on the outer side 11 of the rotor is n to NB; where n≥1, and NB is the total number of magnetic barrier layers of the rotor core 1 under each pole;

[0040] The widths of all the magnetic barrier layers 2 on the Q-axis are B, respectively. q1 B q2 B qNB The widths of all the magnetic barrier layers 2 located on the Q-axis outside the rotor are B, respectively. qn B qNB (Note: B) qNB The subscripts "qNB" and "qN" in the text B "All parameters refer to the same parameter, and all other parameters are the same as described in this explanation."

[0041] The ratio of the sum of the widths of all magnetic barrier layers 2 located outside the rotor on the Q-axis to the sum of the widths of all rotor magnetic barrier layers on the Q-axis is: Right now Where i ranges from n to NB, and j ranges from 1 to NB.

[0042] This invention sets the ratio of the sum of the widths of all magnetic barrier layers located outside the rotor on the Q-axis to the sum of the widths of all rotor magnetic barrier layers on the Q-axis as follows: This allows for the rational design and allocation of the rotor's Q-axis magnetic circuit, the design of the area of ​​the Q-axis filling slot on the outside of the rotor, and the constraint of the proportion of the width of the Q-axis filling slot on the outside of the rotor in the Q-axis magnetic circuit, which can effectively improve the motor's starting capability.

[0043] The rotor is divided into circles with diameter DI as the reference point; the portion larger than DI is the outer side of the rotor, and the portion smaller than DI is the inner side.

[0044] The number of magnetic barrier layers on the rotor is 1 to NB, of which the number of magnetic barrier layers on the outer side of the rotor is n to NB;

[0045] The Q-axis magnetic circuit has all magnetic barrier layers on the outside of the rotor as follows:

[0046] 1. The percentage of the width of the outer magnetic barrier layer on the Q-axis to the total width of all magnetic barriers on the Q-axis.

[0047] The larger the area of ​​the filling groove / guide bar on the outer side of the Q-axis rotor, the stronger the motor's starting capability. However, as the filling groove increases to a certain extent, the rate of increase in starting capability slows down. Specific beneficial effects include... Figure 4 ;

[0048] In some embodiments, the total magnetic circuit width on the Q-axis is Tq, and the sum of the widths of all the magnetic barrier layers 2 on the Q-axis accounts for the proportion of the total magnetic circuit width on the Q-axis as follows: The present invention further defines the proportion of the sum of the widths of all the magnetic barrier layers on the Q-axis to the total magnetic circuit width on the Q-axis as follows: It can constrain the proportion of Q-axis magnetic barriers in the Q-axis magnetic circuit, ensure that the shaft hole is as small as possible while ensuring structural strength, ensure sufficient magnetic conduction channels, and ensure unobstructed magnetic circuit, thereby effectively improving torque output.

[0049] 2. The percentage of all magnetic barrier widths along the Q-axis in the total magnetic circuit along the Q-axis.

[0050] To increase the width of the magnetic barrier slots on the outer side of the Q-axis rotor, while an excessively large Q-axis magnetic barrier would compress the Q-axis magnetic conduction channel space, the total width of the Q-axis magnetic barrier must be constrained. As the width of the Q-axis magnetic barrier increases, the torque output gradually decreases, and the magnetic barrier cannot be zero. Specific beneficial effects include... Figure 5 ;

[0051] The above two points require that the width of the outer magnetic barrier of the Q-axis rotor be as wide as possible to ensure its aluminum casting amount and improve its starting capability; at the same time, the magnetic guide channel of the Q-axis should be wide enough to ensure the motor output capability.

[0052] 1. This invention constrains the proportion of the width of the outer filling groove of the Q-axis rotor in the Q-axis magnetic circuit, thereby improving starting capability;

[0053] 2. This invention constrains the proportion of Q-axis magnetic barriers in the Q-axis magnetic circuit, ensuring sufficient magnetic conduction channels and improving torque output.

[0054] 3. The rotor magnetic barrier of the present invention: air slots formed on the rotor;

[0055] 4. The rotor magnetic channel of the present invention: the portion between the air slots of each layer of the rotor is called the magnetic channel layer;

[0056] 5. The D-axis / Q-axis of the present invention: According to the shape of the air groove, the radial direction parallel to the air groove is called the D-axis, and the radial direction perpendicular to the air groove is called the Q-axis;

[0057] 6. The outer side of the rotor of the present invention: the area covered by a ring with an outer diameter of DR and an inner diameter of DI on the outer side of the rotor;

[0058] 7. The inner side of the rotor of the present invention: the area covered by the ring with a constraint outer diameter of DR and an inner diameter of DSFT is the inner side of the rotor;

[0059] 8. The starting energy inertia multiple of the present invention: the ratio of the maximum starting inertia to the inertia of the motor itself.

[0060] In some embodiments, the rotor core 1 further includes a shaft hole 13 located radially inside it, and Tq is the radius of the rotor core 1 minus the radius of the shaft hole 13. This is a preferred method for calculating Tq in this invention, namely, the total magnetic circuit width on the Q-axis is the radius of the rotor core 1 minus the radius of the shaft hole 13.

[0061] In some embodiments, the rotor core 1 is formed by axially stacking rotor laminations. The present invention enables the formation of a rotor core through lamination stacking.

[0062] In some embodiments, the rotor core has multiple sets of identical air slots, and the number of sets of the magnetic barrier layer 2 is equal to the number of poles of the motor rotor. This is a preferred form of the number of sets of magnetic barrier layers in this invention, which corresponds to the number of poles of the motor rotor to ensure the formation of effective self-starting synchronous magnetic reluctance, ensuring sufficient starting and running capability of the motor. As illustrated in the figures of this invention, it includes two poles, one above the D-axis and one below the D-axis.

[0063] In some embodiments, the air slot is divided into multiple layers along the Q-axis. The magnetic barrier layer 2 on the outer side 11 of the rotor is a filled slot 21, and the magnetic barrier layer 2 on the inner side 12 of the rotor is a non-filled slot 22. Part or all of the filled slots 21 are filled with a conductive but non-magnetic material, i.e., conductor strips 3. The magnetic barrier layer on the outer side of the rotor in this invention is preferably a filled slot to fill with conductive but non-magnetic conductor strips, providing conductivity. The magnetic barrier layer on the inner side of the rotor is not filled with conductor strips. The magnetic barrier layer on the outer side of the rotor filled with conductor strips can play an effective starting role; therefore, its width should be as wide as possible. However, if it becomes too wide, the starting capability slows down. See [reference needed]. Figure 4 .

[0064] In some embodiments, the guide bar 3 is a cast aluminum structure, formed within the filling groove by casting. This is a preferred structural form of the guide bar of the present invention, which can effectively fix the guide bar while being electrically conductive but not magnetically conductive. More preferably, all or part of the magnetic barrier grooves are filled with cast aluminum.

[0065] In some embodiments, end rings 4 made of conductive but non-magnetic material are placed at both axial ends of the rotor core 1, and all or part of the conductor bars 3 are short-circuited together through the end rings to form a circuit. The present invention also enables the end rings to form a circuit connection with the conductor bars, creating a conductive circuit. The motor end rings are preferably circular or other regular or irregular shapes.

[0066] In some embodiments, the portion between two adjacent magnetic barrier layers 2 is a magnetic channel layer 5; the width of each magnetic channel layer 5 on the Q axis is Wq1, Wq2, ..., Wqn.

[0067] The present invention also provides a self-starting synchronous reluctance motor, which includes the self-starting synchronous reluctance motor rotor described in any of the preceding claims.

[0068] The motor of the present invention comprises a rotor core 1 formed by axially stacking rotor laminations;

[0069] The rotor core has multiple sets of identical air slots, and the number of air slot sets is equal to the number of rotor poles.

[0070] The air slots are divided into multiple layers along the Q-axis, with the outer air slot of the rotor being a filling slot 21.

[0071] The air slots are partially or completely filled with a conductive but non-magnetic material, which is called a conductor bar 3;

[0072] The rotor has end rings 4 made of conductive but non-magnetic material placed at both ends;

[0073] All or some of the conductors are short-circuited together through end rings to form a loop;

[0074] The air slots are divided into multiple layers along the Q axis. Based on the shape of the air slots, the radial direction parallel to the air slots is called the D axis, and the radial direction perpendicular to the air slots is called the Q axis.

[0075] Each air slot on the rotor is called the magnetic barrier layer 2, and the part between two adjacent air slots is called the magnetic channel layer 5.

[0076] The widths of the magnetic channel layers on the Q-axis are Wq1, Wq2, ..., Wqn;

[0077] The widths of each magnetic barrier layer on the Q-axis are Bq1, Bq2, ..., Bqn;

[0078] The total magnetic circuit Tq of the Q-axis is the rotor radius minus the shaft hole radius;

[0079] The inner circle of the rotor core is called the shaft hole 13;

[0080] The number of rotor magnetic barrier layers per pole is NB.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A self-starting synchronous reluctance motor rotor, characterized in that: include: A rotor core (1) has air slots formed on it to create a magnetic barrier layer (2). The rotor core (1) includes a D-axis and a Q-axis. The magnetic barrier layer (2) has multiple layers along the Q-axis and is divided into circles with a diameter DI. The portion of the circle larger than DI is the outer side (11) of the rotor, and the portion of the circle smaller than DI is the inner side (12) of the rotor. D R The outer diameter of the rotor core (1); The number of all the aforementioned magnetic barrier layers (2) is 1 to N. B The number of magnetic barrier layers on the outer side (11) of the rotor is n~N. B Where n≥1, the N B The number of all magnetic barrier layers in the rotor core (1) under each pole; The widths of all the magnetic barrier layers (2) on the Q-axis are B respectively. q1 B q2 B qNB The widths of all the magnetic barrier layers (2) located on the Q-axis outside the rotor are B, respectively. qn B qNB ; The ratio of the sum of the widths of all magnetic barrier layers (2) located outside the rotor on the Q-axis to the sum of the widths of all rotor magnetic barrier layers on the Q-axis is: .

2. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The total magnetic circuit width on the Q-axis is Tq, and the sum of the widths of all the magnetic barrier layers (2) on the Q-axis accounts for the proportion of the total magnetic circuit width on the Q-axis as follows: .

3. The self-starting synchronous reluctance motor rotor according to claim 2, characterized in that: The rotor core (1) also includes a shaft hole (13) located on its radial inner side, and Tq is the radius of the rotor core (1) minus the radius of the shaft hole (13).

4. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The rotor core (1) is formed by axially stacking rotor laminations.

5. The self-starting synchronous reluctance motor rotor according to any one of claims 1-4, characterized in that: The magnetic barrier layer (2) on the outer side (11) of the rotor is a filled groove (21), and the magnetic barrier layer (2) on the inner side (12) of the rotor is a non-filled groove (22); and some or all of the filled grooves (21) are filled with conductive but non-magnetic materials, namely conductor strips (3).

6. The self-starting synchronous reluctance motor rotor according to claim 5, characterized in that: The guide bar (3) is a cast aluminum structure and is formed in the filling groove by casting.

7. The self-starting synchronous reluctance motor rotor according to claim 5, characterized in that: The rotor core (1) has end rings (4) made of conductive but non-magnetic material placed at both ends of its axial direction. All or part of the conductor bars (3) are short-circuited together through the end rings to form a circuit.

8. The rotor of the self-starting synchronous reluctance motor according to any one of claims 1-4, characterized in that: The portion between two adjacent magnetic barrier layers (2) is a magnetic channel layer (5).

9. A self-starting synchronous reluctance motor, characterized in that: The rotor of the self-starting synchronous reluctance motor included in any one of claims 1-8.

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