A self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor

Abstract

This disclosure provides a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor. The self-starting synchronous reluctance motor rotor includes: a rotor core, on which air slots are formed to create magnetic barrier layers. Based on the shape of the magnetic barrier layers, the radial direction parallel to the magnetic barrier layers is called the D-axis, and the radial direction perpendicular to the magnetic barrier layers is called the Q-axis. The portion between two adjacent magnetic barrier layers forms a magnetic conduction channel. The pole arc angle An of the nth magnetic barrier layer on the D-axis is the angle between the midpoints of the radial outer circles of the two magnetic conduction channels adjacent to the nth magnetic barrier layer on the D-axis and the lines connecting them to the rotor axis, where n≥1. The stator slot pole arc angle As is the central angle of each stator slot. The first magnetic barrier pole arc angle A1 is: A... S ≤A1≤2×A S Where p is the number of pole pairs of the motor rotor. According to this disclosure, the magnetic circuit width of the D-axis can be effectively guaranteed, thereby effectively improving torque output and enhancing the motor's output capability.

Description

Technical Field

[0001] This disclosure 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] 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.

[0007] 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 it difficult to pull in.

[0008] The main magnetic circuit of a reluctance motor is divided into multiple layers, and magnetic field distortion is easily formed at the connection between the stator magnetic circuit and the rotor magnetic circuit, resulting in torque pulsation.

[0009] Because existing self-starting synchronous reluctance motors have technical problems such as low torque output, resulting in low motor output capability, this disclosure studies and designs a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor.

[0010] Public content

[0011] Therefore, the technical problem to be solved by this disclosure is to overcome the defect of low torque output in the existing self-starting synchronous reluctance motor, which results in low output capability of the motor, and thus provide a self-starting synchronous reluctance motor rotor and a self-starting synchronous reluctance motor.

[0012] To address the aforementioned problems, this disclosure provides a self-starting synchronous reluctance motor rotor, comprising:

[0013] The rotor core has air slots to form magnetic barrier layers; the portion between two adjacent magnetic barrier layers is a magnetic conduction channel; the pole arc angle An of the nth magnetic barrier layer on the D-axis is the angle between the midpoint of the radial outer circle of the two magnetic conduction channels adjacent to the nth magnetic barrier layer on the D-axis and the line connecting them to the rotor axis center, where n≥1; the pole arc angle As of the stator slot is the central angle of each stator slot; and the pole arc angle A1 of the first magnetic barrier layer is:

[0014] Where p is the number of pole pairs of the motor rotor.

[0015] In some implementations, the magnetic barrier arc angle from the second to the penultimate layer is:

[0016]

[0017] In some implementations, the outermost magnetic barrier arc angle A NB The outermost magnetic barrier is a magnetic barrier layer located radially at the outermost end in the direction of the Q axis, and the polar arc angle A of the outermost magnetic barrier is... NB The angle between the midpoint of the arc of the radial outer circle of the magnetic channel adjacent to the outermost magnetic barrier, the line connecting the rotor shaft center, and the Q axis;

[0018]

[0019] In some implementations, the magnetic barrier pole arc angles of each layer radially outward along the Q-axis are A1, ..., A1, ... NB The 1≤n≤NB, where NB is the number of rotor magnetic barrier layers per pole.

[0020] In some implementations, the number of stator slots is NS, and the stator slot polar arc angle As is the polar arc angle occupied by each stator slot.

[0021] In some embodiments, the rotor core is formed by axially stacking rotor laminations.

[0022] In some embodiments, the magnetic barrier layer is divided into multiple layers along the Q-axis, and the magnetic barrier layer that is closer to the radial outer circle relative to the rotor axis is a filling groove; the filling groove is filled with a conductive but non-magnetic material, i.e., a conductor bar.

[0023] In some embodiments, the guide bar is a cast aluminum structure, formed in the filling groove by casting.

[0024] 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.

[0025] This disclosure 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 in this disclosure have the following beneficial effects:

[0027] 1. This disclosure defines the first magnetic barrier polar arc angle A1 as: Since the first layer of magnetic barrier pole arc determines the position of each layer of magnetic barrier group on the rotor relative to the stator, such a constraint condition can effectively constrain the angle of the first layer of magnetic barrier pole arc, thereby effectively ensuring the width of the D-axis magnetic circuit, thus effectively improving the torque output and enhancing the output capability of the motor; and as A1 increases, the torque output increases, but when A1 increases to a certain extent, the increase in torque slows down.

[0028] 2. This disclosure also sets the magnetic barrier polar arc angle from the second layer to the penultimate layer as follows: It can effectively constrain the pole arc angles of the second to penultimate magnetic barriers. After confirming the overall position of the magnetic barrier slots with the first line, the intermediate magnetic barriers are reasonably arranged. The pole arcs of each layer of magnetic barriers are within the above range and are slightly larger than the stator slot pole arcs. This prevents magnetic field distortion at the connection between the stator magnetic circuit and the rotor magnetic circuit, ensuring a smooth and gradual transition of the magnetic field, and effectively reducing torque pulsation. When An is within the constrained range, the torque pulsation is significantly low. If An is too large or too small, it will lead to an increase in torque pulsation.

[0029] 3. This disclosure also specifies the outermost magnetic barrier polar arc angle A. NB Set to: By increasing the angle of the outermost magnetic barrier arc, the area of ​​the filling slot and the amount of filling conductor can be increased, thereby enhancing the starting capability. As ANB increases, the filling slot and filling conductor increase, and the starting capability is enhanced accordingly. However, when ANB increases to a certain extent, the enhancement of the starting capability becomes less significant, so an upper limit is set.

[0030] 4. This disclosure can effectively improve torque output capability and reduce torque pulsation by constraining the proportion of each layer of magnetic barriers on the outer circle pole arc of the rotor; at the same time, it constrains the outermost magnetic barrier of the Q-axis to be as large as possible to ensure sufficient cast aluminum amount and improve starting capability. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the magnetic barriers and magnetic conduction channels of the rotor of the self-starting synchronous reluctance motor disclosed herein;

[0032] Figure 2 This is a schematic diagram of the structure of each magnetic barrier pole arc of the rotor of the self-starting synchronous reluctance motor disclosed herein;

[0033] Figure 3 This is a schematic diagram of the stator slot pole arc of the self-starting synchronous reluctance motor disclosed herein;

[0034] Figure 4 This is a graph showing the relationship between the A1 magnetic barrier pole arc angle and torque output in this disclosure.

[0035] Figure 5 This is a graph showing the relationship between the An magnetic barrier pole arc angle and torque pulsation in this disclosure.

[0036] Figure 6 For the purpose of this disclosure A NB / A S A graph showing the relationship between the impact on starting capability;

[0037] Figure 7 This is a schematic diagram of the guide bar and end ring of this disclosure.

[0038] The reference numerals in the attached figures are as follows:

[0039] 1. Rotor core; 10. Shaft hole; 2. Magnetic barrier layer; 3. Magnetic guide channel; 4. Conductor bar; 5. End ring; 6. Stator; 61. Stator slot. Detailed Implementation

[0040] like Figure 1-7 As shown, this disclosure provides a self-starting synchronous reluctance motor rotor, which includes:

[0041] The rotor core 1 has air slots to form magnetic barrier layers 2. Based on the shape of the magnetic barrier layers 2, the direction of high permeability is the D-axis, and the direction of low permeability is the Q-axis. Two adjacent rotor poles are symmetrical about the D-axis, and within the same pole, they are symmetrical about the Q-axis. The portion between two adjacent magnetic barrier layers 2 forms a magnetic channel 3. The arc angle An of the nth magnetic barrier layer on the D-axis is the angle between the midpoint of the radial outer circle of the two magnetic channels adjacent to the nth magnetic barrier layer on the D-axis and the line connecting them to the rotor axis, where n ≥ 1. The arc angle As of the stator slot is the central angle of each stator slot. The arc angle A1 of the first magnetic barrier layer is:

[0042] Where p is the number of pole pairs of the motor rotor.

[0043] This disclosure defines the first magnetic barrier polar arc angle A1 as: Since the first layer of magnetic barrier pole arcs determines the overall position of each layer of magnetic barrier groups on the rotor relative to the stator, this constraint effectively constrains the angle of the first layer of magnetic barrier pole arcs, thereby effectively ensuring the width of the D-axis magnetic circuit, thus effectively improving torque output and enhancing the motor's output capability; furthermore, as A1 increases, the torque output increases, but after A1 increases to a certain extent, the increase in torque slows down. Figure 4 Torque output: As A1 increases, the torque output increases. However, once A1 increases to a certain extent, the increase in torque slows down.

[0044] This disclosure effectively improves torque output capability and reduces torque pulsation by constraining the proportion of each layer of magnetic barriers on the outer circular pole arc of the rotor; at the same time, it constrains the outermost magnetic barrier of the Q-axis to be as large as possible to ensure sufficient cast aluminum amount and improve starting capability.

[0045] Keywords:

[0046] 1. Rotor magnetic barriers: The various layers of air slots opened on the rotor;

[0047] 2. Rotor magnetic channel: The portion between the air slots of each layer of the rotor is called the magnetic channel;

[0048] 3. Magnetic barrier group: All magnetic barrier arcs under one pole;

[0049] 4. Magnetic barrier arc angle: The angle between the midpoints of two magnetic channels adjacent to a certain magnetic barrier layer, with the rotor axis as the center of the circle;

[0050] 5. Stator slot polar arc: The stator slot polar arc angle is the polar arc angle occupied by each stator slot.

[0051] The motor disclosed herein comprises a rotor core 1 formed by axially stacking rotor laminations;

[0052] The rotor core has multiple sets of identical air slots (magnetic barrier layer 2), and the number of air slots is equal to the number of rotor poles;

[0053] The air slots are divided into multiple layers along the Q-axis, with the outer air slots of the rotor being filled slots.

[0054] The air slots are partially or completely filled with a conductive but non-magnetic material, which is called conductor bar 4;

[0055] The rotor has end rings 5 ​​made of conductive but non-magnetic material placed at both ends;

[0056] All or some of the conductors are short-circuited together through end rings to form a loop;

[0057] 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.

[0058] Each air slot on the rotor is called a magnetic barrier layer 2, and the part between two adjacent air slots is called a magnetic channel 3.

[0059] The magnetic barrier arc angle is the angle between the midpoints of two magnetically conductive channels adjacent to a certain magnetic barrier layer, with the rotor axis as the center of the circle;

[0060] The number of stator slots is N S The number of rotor magnetic barrier layers per pole is N B ;

[0061] The magnetic barrier pole angles of each layer radially outward along the Q-axis are A1, ..., A. NB ;

[0062] Where the polar arc angle A NB This is half the polar arc angle of the last magnetic barrier;

[0063] The stator slot polar arc angle is the polar arc angle occupied by each stator slot.

[0064] In some implementations, the magnetic barrier arc angle from the second to the penultimate layer is:

[0065]

[0066] This disclosure also sets the magnetic barrier polar arc angles from the second to the penultimate layer as follows: This effectively constrains the pole arc angles of the second to penultimate magnetic barriers. After confirming the overall position of the magnetic barrier slots using the first method, the intermediate magnetic barriers are rationally arranged, with the pole arcs of each layer located within the aforementioned range and slightly larger than the stator slot pole arcs. This prevents magnetic field distortion at the connection between the stator and rotor magnetic circuits, ensuring a smooth and gradual transition of the magnetic field and effectively reducing torque ripple. Within the constrained range, An results in significantly lower torque ripple; however, excessively large or small An leads to increased torque ripple. Figure 5 Torque ripple: When An is within the constraint range, torque ripple is significantly low. If An is too large or too small, torque ripple will increase.

[0067] 1. This disclosure constrains the first layer of magnetic barrier pole arcs and determines the position of the entire magnetic barrier group, which can improve torque output capability and motor output capability;

[0068] 2. This disclosure constrains the magnetic barrier pole arc angles of the second to penultimate layers to determine the relative positions of the magnetic barriers in each layer; the magnetic barrier slot and half of each of the magnetically conductive channels of the two adjacent layers form the magnetic barrier pole arc. Precise design of the magnetic barrier pole arc can reduce torque pulsation.

[0069] 3. By constraining the outermost magnetic barrier arc, the amount of filler conductor is increased to ensure sufficient conductor filling, thereby improving starting capability and torque output.

[0070] In some implementations, the outermost magnetic barrier arc angle A NB The outermost magnetic barrier is a magnetic barrier layer located radially at the outermost end in the direction of the Q axis, and the polar arc angle A of the outermost magnetic barrier is... NB The angle between the midpoint of the arc of the radial outer circle of the magnetic channel adjacent to the outermost magnetic barrier, the line connecting the rotor shaft center, and the Q-axis;

[0071]

[0072] This disclosure also involves the outermost magnetic barrier polar arc angle A.NB Set to: By increasing the angle of the outermost magnetic barrier arc, the area of ​​the filling slot and the amount of filling conductor can be increased, thereby enhancing the starting capability. As ANB increases, the filling slot and filling conductor increase, and the starting capability is enhanced accordingly. However, when ANB increases to a certain extent, the enhancement of the starting capability becomes less significant, so an upper limit is set.

[0073] like Figure 6 Starting capacity: As ANB increases, the filling groove and filling conductor increase, and the starting capacity is enhanced accordingly. However, when ANB increases to a certain extent, the enhancement of starting capacity becomes less significant.

[0074] In some implementations, the magnetic barrier pole arc angles of each layer radially outward along the Q-axis are A1, ..., A1, ... NB The 1≤n≤NB, where NB is the number of rotor magnetic barrier layers per pole.

[0075] In some implementations, the number of stator slots is NS, and the stator slot polar arc angle As is the polar arc angle occupied by each stator slot.

[0076] 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 the number of poles of the motor rotor, as illustrated in the figures of this disclosure, including two poles, one above the D-axis and one below the D-axis.

[0077] In some embodiments, the magnetic barrier layer 2 is divided into multiple layers along the Q axis, and the magnetic barrier layer 2 that is closer to the radial outer circle relative to the rotor axis is a filling groove; the filling groove is filled with a conductive but non-magnetic material, namely a conductor strip 4.

[0078] In some embodiments, the guide bar 4 is a cast aluminum structure, formed in the filling groove by casting.

[0079] The motor described in this invention can be made of cast aluminum in all magnetic barrier slots or cast aluminum in some magnetic barrier slots;

[0080] The motor end ring described in this invention can be circular or other regular or irregular shapes.

[0081] In some embodiments, end rings 5 ​​made of conductive but non-magnetic material are placed at both ends of the rotor core 1 along its axial direction, and all or part of the conductor bars 4 are short-circuited together through the end rings 5 ​​to form a circuit.

[0082] This disclosure also provides a self-starting synchronous reluctance motor, which includes the self-starting synchronous reluctance motor rotor as described in any of the preceding claims, and further includes a stator 6, the stator 6 including stator slots 61.

[0083] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure. The above description is only a preferred embodiment of this disclosure. 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 this disclosure, and these improvements and modifications should also be considered within the protection scope of this disclosure.

Claims

1. A self-starting synchronous reluctance motor rotor, characterized in that: include: The rotor core (1) has air slots to form a magnetic barrier layer (2); the portion between two adjacent magnetic barrier layers (2) is a magnetic channel (3); the pole arc angle An of the nth magnetic barrier layer on the D-axis is: the angle between the midpoint of the radial outer circle of the two magnetic channels adjacent to the nth magnetic barrier layer on the D-axis and the line connecting them to the rotor axis, where n≥1; the pole arc angle As of the stator slot is the central angle of each stator slot; and the pole arc angle A1 of the first magnetic barrier layer is: ; Where p is the number of pole pairs of the motor rotor.

2. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The magnetic barrier arc angles from the second to the penultimate layer are: ； 。 3. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: Outermost magnetic barrier polar arc angle A NB The outermost magnetic barrier is a magnetic barrier layer located radially at the outermost end in the direction of the Q axis, and the polar arc angle A of the outermost magnetic barrier is... NB The angle between the line connecting the midpoint of the radial outer arc of the magnetic channel adjacent to the outermost magnetic barrier and the rotor shaft center and the Q axis; ； 。 4. The self-starting synchronous reluctance motor rotor according to claim 3, characterized in that: The magnetic barrier pole arc angles of each layer radially outward along the Q-axis are A1, ..., A1, ... NB , 1≤n≤NB, where NB is the total number of rotor magnetic barrier layers per pole.

5. The self-starting synchronous reluctance motor rotor according to claim 1, characterized in that: The number of stator slots is N S , .

6. The self-starting synchronous reluctance motor rotor according to any one of claims 1-5, characterized in that: The rotor core (1) is formed by axially stacking rotor laminations.

7. The self-starting synchronous reluctance motor rotor according to any one of claims 1-5, characterized in that: The magnetic barrier layer (2) is divided into multiple layers along the Q axis, and the magnetic barrier layer (2) that is closer to the radial outer circle relative to the rotor axis is a filling groove; the filling groove is filled with a conductive but non-magnetic material, namely a conductor strip (4).

8. The self-starting synchronous reluctance motor rotor according to claim 7, characterized in that: The guide bar (4) is a cast aluminum structure and is formed in the filling groove by casting.

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

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

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