A reluctance motor rotor structure and reluctance motor

Abstract

The present invention provides a reluctance motor rotor structure and a reluctance motor, wherein the rotor structure includes a rotor, wherein the rotor and a plurality of V-shaped grooves arranged in a ring shape are arranged on the rotor, and two permanent magnets that are relatively inclined are arranged in each V-shaped groove to form the magnetic poles of the rotor, and further includes a magnetic barrier groove arranged outside each V-shaped groove. The magnetic barrier groove plays a shielding role. It can be seen from the above description that by changing the arrangement of the permanent magnets, the amount of permanent magnets used can be reduced, thereby reducing the cost of the rotor and the cost of the motor.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a reluctance motor rotor structure and a reluctance motor. Background Art

[0002] Currently available permanent magnet synchronous rotors are as follows Figure 1 As shown, the rotor is provided with magnets, and the torque is mainly electromagnetic torque. The structure uses more rare earth magnets. The current price of rare earth magnets is high, the cost of motors remains high, and the efficiency of ferrite motors is low. Summary of the invention

[0003] The invention provides a reluctance motor rotor structure and a reluctance motor, which are used to reduce the amount of magnetic steel used and reduce.

[0004] The present invention provides a reluctance motor rotor structure, which includes a rotor, wherein the rotor and a plurality of V-shaped grooves arranged in a ring shape are arranged on the rotor, and two permanent magnets that are relatively inclined are arranged in each V-shaped groove to form the magnetic poles of the rotor, and further includes a magnetic barrier groove arranged outside each V-shaped groove. The magnetic barrier groove plays a shielding role. It can be seen from the above description that by changing the arrangement of the permanent magnets, the amount of permanent magnets used is reduced, thereby reducing the cost of the rotor and the cost of the motor.

[0005] When the permanent magnets are specifically arranged, the V-shaped groove body includes two relatively inclined first groove bodies and a second groove body connecting the two first groove bodies, and the two permanent magnets correspond to the two first groove bodies one by one.

[0006] The opening angle of the V-shaped groove is θ1, and satisfies:

[0007] 360 / (2*P)≤θ1≤1.5*360 / (2*P), wherein P is the number of rotor poles of the rotor.

[0008] When the magnetic barrier groove is specifically set, the magnetic barrier groove and the V-shaped groove body are nested, and the magnetic barrier groove includes: two relatively inclined third groove bodies, and a fourth groove body located between the two third groove bodies, wherein each third groove body is spaced apart from the fourth groove body, and the space between the third groove body and the fourth groove body forms a magnetic bridge that conducts adjacent permanent magnets.

[0009] The width of the fourth slot body is greater than the width of the third slot body.

[0010] The rotor structure also includes an air hole nested with the V-shaped groove body.

[0011] The air hole is an elliptical air hole.

[0012] In a specific configuration, the rotor is a silicon steel sheet rotor.

[0013] The permanent magnet is magnetic steel.

[0014] The present invention also provides a reluctance motor, comprising any of the above-mentioned reluctance motor rotor structures. By arranging a single layer of magnetic steel in the inner V-shaped groove body, the amount of magnetic steel used is reduced, and the cost of the motor is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a reluctance motor rotor structure in the prior art;

[0016] Figure 2 A schematic structural diagram of a reluctance motor rotor structure provided by an embodiment of the present invention;

[0017] Figure 3 A schematic structural diagram of another reluctance motor rotor structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In order to facilitate understanding of the reluctance motor rotor structure provided in the embodiment of the present application, its application scenario is first explained. In the embodiment of the present application, the reluctance motor rotor 10 is applied to the reluctance motor, which is a continuously running electrical transmission device. Its structure and working principle are very different from those of traditional AC and DC motors. It does not rely on the interaction of the magnetic field generated by the stator and rotor 10 winding currents to generate torque, but relies on the "minimum magnetic resistance principle" to generate torque. The reluctance motor rotor 10 is mainly composed of two parts, a rotor and a permanent magnet arranged on the rotor. As Figure 1 As shown in Figure 1 FIG. 2 shows a structure of a reluctance motor rotor in the prior art. Figure 1 It can be seen that the magnetic steel ring 2 on the rotor 1 is arranged around the rotor 1, which requires more magnetic steel, resulting in a larger amount of magnetic steel, which in turn affects the cost of the entire motor.

[0020] In the embodiment of the present invention, in order to reduce the cost of the motor, the arrangement of the permanent magnet is improved. Figure 2 .like Figure 2As shown in the figure, in the reluctance electrode rotor structure provided in the embodiment of the present invention, a rotor 10 is included, and the rotor 10 is a silicon steel sheet rotor 10, which is made of silicon steel sheets. A plurality of V-shaped grooves 11 are arranged on the rotor 10 in a ring shape and are used to accommodate permanent magnets to form magnetic poles of the rotor 10. Figure 2 In the structure shown in , the number of the V-shaped grooves 11 is six, and the opening direction of each V-shaped groove 11 faces outward.

[0021] When the V-shaped groove 11 is specifically set, Figure 2 As shown in , each V-shaped groove body 11 includes two relatively inclined first groove bodies 111 and a second groove body 112 connecting the two first groove bodies 111. The two first groove bodies 111 are relatively inclined toward the outside, thereby forming a structure with a large opening and a small bottom. In addition, when the opening angle is formed, that is, the relative inclination angle between the two first groove bodies 111, it refers to the opening angle of the V-shaped groove body 11. The opening angle is set to θ1. When the opening of the V-shaped groove body 11 is specifically set, θ1 satisfies: 360 / (2*P)≤θ1≤1.5*360 / (2*P), wherein P is the number of poles of the rotor 10. As shown Figure 2 As shown in , when the number of rotor poles is 6, 30°≤θ1≤45° is satisfied. Figure 3 In the structure shown in , the number of poles of the rotor 10 is 4, and in this case, 45°≤θ1≤67.5° is satisfied. Figure 2 ,exist Figure 2 In the structure shown, the second slot body 112 is used to connect the two first slot bodies 111, and in a specific configuration, the widths of the two first slot bodies 111 and the second slot body 112 are the same. In addition, the first slot body 111 and the second slot body 112 form an axisymmetric structure.

[0022] When the permanent magnet is specifically arranged, the permanent magnet is fixed in the V-shaped groove body 11. When the permanent magnet is specifically arranged, Figure 2 As shown in , each permanent magnet is arranged in one-to-one correspondence with the first slot body 111, and is fixed in the first slot body 111 by embedding, and as shown in Figure 2 As shown in , the length direction of the permanent magnet is arranged along the direction of the first slot body 111. As a result, the two permanent magnets forming the magnetic poles are arranged in the same manner as the first slot body 111. You can refer to the above description of the relative position relationship of the first slot body 111. When setting the permanent magnet, the opening formed by the two permanent magnets is also θ1, which also satisfies the relationship of 360 / (2*P)≤θ1≤1.5*360 / (2*P), which will not be described in detail here. In addition, the permanent magnet is made of magnetic steel when it is specifically set. Figure 1 Compared with the magnetic steel of each magnetic pole formed as shown in the figure, Figure 1A long section of magnetic steel 2 is used to form the magnetic pole. Figure 2 As shown in the figure, in the present invention, two shorter magnetic steels are used to form the magnetic poles, and only two magnetic steels are arranged on both sides of the V-shaped groove body 11. This design can increase the salient pole rate of the motor, so that the motor can ensure that the motor efficiency meets the requirements under lower back electromotive force conditions by utilizing part of the magnetic resistance torque, thereby reducing the amount of magnetic steel used and thus reducing the cost of the motor.

[0023] In addition, the rotor structure further includes a magnetic barrier slot 12, and when arranged, the magnetic barrier slot 12 is arranged outside each V-shaped slot body 11. Figure 2 As shown in , when the magnetic barrier slots 12 are arranged, the magnetic barrier slots 12 are nested with the V-shaped slot bodies 11. When the number of the V-shaped slot bodies 11 is 6, the number of the corresponding magnetic barrier slots 12 is also 6. The structure of each magnetic barrier slot 12 includes: two relatively inclined third slot bodies 121, and a fourth slot body 122 located between the two third slot bodies 121, wherein each third slot body 121 is spaced apart from the fourth slot body 122, and the space between the third slot body 121 and the fourth slot body 122 forms a magnetic bridge 14 that conducts adjacent permanent magnets. As shown in Figure 2 As shown in , the shape of the fourth slot body 122 is similar to that of the V-shaped slot body 11, including a horizontal portion and two relatively inclined inclined portions. When the magnetic barrier slot 12 is nested with the V-shaped slot, the third slot body 121 and the inclined portion are correspondingly located on the outside of the first slot body 111, and the horizontal portion of the fourth slot body is located on the outside of the second slot body 112. And in the specific setting, the width of the first slot body 111 is the same as the width of the third slot body 121 and the inclined portion, while the width of the horizontal portion of the fourth slot body 122 is greater than the width of the second slot body 112. Similarly, the width L1 of the horizontal portion of the fourth slot body 122 is also greater than the width L2 of the third slot body 121. In addition, when the magnetic conductive bridge 14 is set, the magnetic conductive bridge 14 is the gap between the third slot body 121 and the inclined portion located on the same side as it. In addition, a magnetic barrier groove 12 is arranged outside the V-shaped groove body 11, and a magnetic bridge 14 is arranged near the bottom position of the V-shaped groove body 11 (the position of the second groove body 112), and the thickness of the bottom of the magnetic barrier groove 12 is greater than the thickness of the grooves on both sides, thereby increasing the motor salient pole ratio, reducing the d-axis inductance, and increasing the q-axis inductance, that is, increasing (L d -L q ), according to the motor torque formula T em =p[ψ m i q +(L d -L q )i d i q ], which improves the utilization rate of reluctance torque and enhances motor efficiency.

[0024] In addition, when the rotor structure is specifically set, the rotor structure also includes an air hole 13 nested with the V-shaped groove body 11. Figure 2 As shown in , the air hole 13 corresponds to the V-shaped groove body 11 one by one. And it is located in the area wrapped by the V-shaped groove body 11. When the air hole 13 is specifically set, the air hole 13 is an elliptical air hole 13, and the long axis direction of the air hole 13 is parallel to the length direction of the second groove body 112. Thus, by weakening the sudden change of the magnetic field, reducing torque fluctuations and reducing noise.

[0025] In addition, the present invention also provides a reluctance motor, including any of the above reluctance motor rotor structures. By arranging a single layer of magnetic steel on the inner V-shaped groove 11, the amount of magnetic steel used is reduced, and the cost of the motor is reduced.

[0026] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A reluctance motor rotor structure, characterized in that: The invention comprises a rotor, and a plurality of V-shaped grooves arranged in an annular shape on the rotor, wherein each V-shaped groove is provided with two permanent magnets inclined relative to each other; and further comprises a magnetic barrier groove arranged outside each V-shaped groove; The magnetic barrier slot is nested with the V-shaped slot body, and the magnetic barrier slot includes: two relatively inclined third slot bodies, and a fourth slot body located between the two third slot bodies, wherein each third slot body is spaced apart from the fourth slot body, and the space between the third slot body and the fourth slot body forms a magnetic bridge that conducts adjacent permanent magnets; The fourth slot body comprises a horizontal portion and two relatively inclined portions; the width of the horizontal portion is greater than the width of the third slot body; The magnetic conductive bridge is a gap between the third slot body and the inclined portion located on the same side thereof.

2. The reluctance motor rotor structure according to claim 1, characterized in that: The V-shaped groove body includes two relatively inclined first groove bodies and a second groove body connected to the two first groove bodies, and the two permanent magnets correspond to the two first groove bodies one by one.

3. The reluctance motor rotor structure according to claim 1, characterized in that: The opening angle of the V-shaped groove is θ1, and satisfies: 360 / (2*P)≤θ1≤1.5*360 / (2*P), wherein P is the number of rotor poles of the rotor.

4. The reluctance motor rotor structure according to claim 1, characterized in that: The width of the fourth slot body is greater than the width of the third slot body.

5. The reluctance motor rotor structure according to claim 1, characterized in that: It also includes an air hole nested with the V-shaped groove body.

6. The reluctance motor rotor structure according to claim 5, characterized in that: The air hole is an elliptical air hole.

7. The reluctance motor rotor structure according to claim 1, characterized in that: The rotor is a silicon steel sheet rotor.

8. The reluctance motor rotor structure according to claim 1, characterized in that: The permanent magnet is magnetic steel.

9. A reluctance motor, characterized in that: It comprises the reluctance motor rotor structure as claimed in any one of claims 1 to 8.

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