A rotor core with variable air gap pole wings and a switched reluctance motor

Abstract

The present invention discloses a rotor core with variable air gap pole wings and a switched reluctance motor, belonging to the field of switched reluctance motors. The switched reluctance motor with a rotor core having variable air gap pole wings, while maintaining the same number of phases and number of salient poles of the stator core as the traditional switched reluctance motor, reduces the number of rotor core poles by setting the stator and rotor core pole number ratio to m / n=q, increases the commutation residual angle, reduces the edge air gap by adding pole wings on both sides of the outer end of the salient pole, and sets a gradual air gap between the pole wing and the salient pole of the stator core to generate a gradual inductance, thereby achieving the purpose of reducing the torque pulsation of the switched reluctance motor and reducing the switching efficiency loss, and is mainly used in the field of switched reluctance motors.

Description

[Technical field]

[0001] The invention relates to the field of switched reluctance motors, and in particular to a rotor core with variable air gap pole wings and a switched reluctance motor. [Background technology]

[0002] The main disadvantages of the switched reluctance motor are torque pulsation and noise. The magnetic attraction of the energized salient poles is divided into tangential magnetic attraction and radial magnetic attraction. The tangential magnetic attraction produces torque, while the radial magnetic attraction does not. During the inductance increase process, that is, the process of salient pole alignment, when the excitation is stable, the radial magnetic attraction continues to increase, while the tangential magnetic attraction continues to decrease. When the salient poles are fully aligned, the radial magnetic attraction is the maximum, while the tangential magnetic attraction is zero. Therefore, the radial magnetic attraction is the main cause of torque pulsation and noise in the switched reluctance motor.

[0003] The advantage of the switched reluctance motor is that it is easy to achieve high speed, but high speed requires consideration of the impact of high switching frequency on motor efficiency. The switching frequency is proportional to the number of rotor core poles, and the number of stator core poles is positively correlated with the winding slot full rate. Therefore, the design should ensure a higher number of stator core poles and a lower number of rotor core poles, that is, the stator-rotor core pole ratio is as large as possible. The traditional q-phase switched reluctance motor stator-rotor core pole ratio is m / n=q / (q-1), which has become a theorem. Based on this design, it is impossible to further increase the stator-rotor core pole ratio, such as q / (q-1)=1.5 for 3-phase and q / (q-1)=1.33 for 4-phase. The switching frequency is proportional to the switching efficiency loss.

[0004] Therefore, how to resolve the above contradictions, how to reduce the torque pulsation of the switched reluctance motor, reduce the switching frequency, and reduce the switching efficiency loss under the same number of phases and number of stator core salient poles, is a technical problem that the existing switched reluctance motor needs to solve. [Summary of the invention]

[0005] In order to improve the deficiencies of the prior art, the object of the present invention is to provide a rotor core and a switched reluctance motor with variable air gap pole wings. While maintaining the same number of phases and number of salient poles of the stator core as the traditional switched reluctance motor, the number of rotor poles is reduced by setting the stator and rotor core pole number ratio to m / n=q, thereby increasing the commutation residual angle (BA), adding pole wings on both sides of the outer end of the salient pole to reduce the marginal air gap, and setting a gradual air gap on the pole wing to produce a gradual inductance, thereby achieving the purpose of reducing the torque pulsation of the switched reluctance motor and reducing the switching efficiency loss.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A rotor core with variable air gap pole wings, which is applied to a q-phase switched reluctance motor with a stator core pole number of m, q≥3, comprising a rotor core yoke and a rotor core salient pole, wherein n rotor core salient poles are evenly arranged on the rotor core, n≥2, and m / n=q, and the rotor core salient poles are all provided with a pole body and a pole wing, that is, the middle part of the rotor core salient pole is defined as the pole body, the radial inner end of the pole body is connected to the rotor core yoke, the left and right sides of the radial outer end of the pole body are respectively connected to the pole wing, the pole wing extends outward away from the pole body, and the distance between the radial outer side surface of the pole wing and the center of the rotor core decreases in the extension direction.

[0008] In the present invention, further, the mechanical angle of the pole body of the salient pole of the rotor core is C, the mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, the theoretical mechanical angle of the salient pole of the rotor core is E=180° / m, and 0.6E≤C≤1.3E, 120° / n≤D≤360° / n.

[0009] In the present invention, further, the mechanical angle between the outermost edges of the two pole wings on any salient pole of the rotor core is D, and (120° / n+C)≤D≤(360° / nC).

[0010] In the present invention, further, the radial outer side surface of the pole wing is an arc surface, the two pole wings on the same salient pole of the rotor core are equal in size, symmetrical in structure and on the same arc surface, the center point of the arc surface is set on the center line of the pole body, and the radius r of the arc surface is smaller than the radius R of the rotor core.

[0011] A switched reluctance motor with a rotor core having a variable air gap pole wing, comprising a stator core and a rotor core, wherein the number of phases of the switched reluctance motor is q, q≥3, m salient poles are evenly arranged on the stator core, n salient poles are evenly arranged on the rotor core, n≥2, and m / n=q, then the cross-phase switching mechanical angle is A=360° / qn, the rising inductance zone mechanical angle is B=180° / n, the phase switching residual angle is (BA)=(180°-360° / q) / n, and the rotor core salient poles are all provided with pole bodies and poles. The wing, that is, the middle part of the salient pole of the rotor core is defined as the pole body, the radial inner end of the pole body is connected to the yoke of the rotor core, the left and right sides of the radial outer end of the pole body are respectively connected to the pole wing, the pole wing extends outward away from the pole body, the air gap between the part of the pole wing closest to the pole body and the salient pole of the stator core is the minimum air gap t1 of the pole wing, the air gap between the part of the pole wing farthest from the pole body and the salient pole of the stator core is the maximum air gap t2 of the pole wing, t1<t2, and the air gap of the pole wing in the rotation direction is a variable air gap that decreases from t2 to t1.

[0012] In the present invention, further, the mechanical angle of the pole body of the salient pole of the rotor core is C, the mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, the theoretical mechanical angle of the salient pole of the rotor core is E=180° / m, and 0.6E≤C≤1.3E, 120° / n≤D≤360° / n, so that the magnetic poles are concentrated and the edge air gap is optimized within a reasonable range.

[0013] In the present invention, further, the mechanical angle between the outermost edges of the two pole wings on any salient pole of the rotor core is D, and (120° / n+C)≤D≤(360° / nC), so that the edge air gap is optimized within a reasonable range.

[0014] In the present invention, further, the air gap of the salient pole of the rotor core is s, the air gap of the pole wing edge is u, the air gap of the yoke is v, and the ratio of the maximum air gap to the minimum air gap of the pole wing is in the range of 3≤t2 / t1≤30, and s≤t1<t2≤u<v. Thus, the air gap of the pole wing is optimized within a reasonable range.

[0015] In the present invention, further, the radial outer side surface of the pole wing is an arc surface, the two pole wings on the same salient pole are equal in size, symmetrical in structure and on the same arc surface, the center point of the arc surface is set on the center line of the pole body, and the radius r of the arc surface is smaller than the radius R of the rotor core. The air gap of the pole wing changes evenly and smoothly, thereby making the torque smoother.

[0016] The principle of the present invention is:

[0017] A switched reluctance motor has a phase number of q, a stator core pole number of m, a rotor core pole number of n, a stator-rotor core pole number ratio of m / n, a switching mechanical angle of A=360° / qn, A represents the minimum switching mechanical angle in which each phase is energized and only switches without overlapping, a rising inductance zone mechanical angle of B=180° / n, B represents the maximum mechanical angle allowed for each phase to be energized, and the present invention defines a switching residual angle as (BA)=(180°-360° / q) / n. The larger the switching residual angle, the smaller the radial magnetic attraction during switching, and the smaller the torque pulsation and noise.

[0018] The conventional switched reluctance motor has m / n=q / (q-1), while the switched reluctance motor of the present invention has m / n=q. When the number of phases and the number of salient poles of the stator core are the same as those of the conventional switched reluctance motor, since q>q / (q-1), it is easy to prove that the number of poles of the rotor core of the switched reluctance motor of the present invention is smaller than that of the conventional switched reluctance motor, and it is easy to prove that the commutation residual angle of the switched reluctance motor of the present invention is larger than that of the conventional switched reluctance motor. Therefore, the present invention can effectively reduce torque pulsation and switching efficiency loss.

[0019] Windings need to be installed on the stator core, and the slots and teeth need to occupy a certain space respectively. The slot space determines the ampere-turn magnetic energy product, and the pole body width determines the cross-sectional magnetic energy product. The two cannot be neglected. The salient pole mechanical angle is C, which represents the salient pole arc width. When the salient pole is set in a rectangle, it also represents the salient pole body width. The magnetic circuit always tends to concentrate on the magnetic pole, so the pole body width should be small rather than large. The theoretical mechanical angle of the salient pole is E = 180° / m. In order to ensure that the stator core has a suitable ampere-turn magnetic energy product and cross-sectional magnetic energy product, and to ensure the concentration of the magnetic pole, the actual mechanical angle C of the stator core salient pole and the rotor core salient pole is usually close to the theoretical mechanical angle E of the salient pole, 0.6E≤C≤1.3E, and C=E is preferred. The mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, and 0.6E≤C≤1.3E, 120° / n≤D≤360° / n, so that the magnetic pole is concentrated and the edge air gap is optimized within a reasonable range.

[0020] The switched reluctance motor has a maximum inductance and a minimum inductance. The ratio of the maximum inductance to the minimum inductance is positively correlated with the torque. The maximum inductance is determined by the pole body air gap. The pole body air gap is as small as possible, but it cannot be infinitely small due to assembly conditions. The pole body air gap is usually a constant s; the minimum inductance corresponds to the edge air gap u and the yoke air gap v. The edge air gap u is smaller than the yoke air gap v. The yoke air gap v is mainly considered to ensure the shaft hole strength, and the edge air gap u is mainly considered to ensure that the peak current is at an appropriate value. If the edge air gap u is too large, it will result in insufficient torque and excessive peak current. If the edge air gap u is too small, it will result in too small peak current and insufficient power.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The rotor core of the present invention can reduce the edge air gap when used in a switched reluctance motor by arranging pole wings. By setting the radial outer side surface as an arc surface, and the radius r of the arc surface is smaller than the radius R of the rotor core, the air gap between the salient poles of the stator core when used in the switched reluctance motor is a smooth and gradual air gap, thereby generating a smooth and gradual inductance, thereby achieving the purpose of reducing the torque pulsation of the switched reluctance motor.

[0023] 2. The present invention reduces the number of rotor core poles and increases the commutation residual angle by setting the stator-rotor core pole number ratio, reduces the edge air gap by adding pole wings on both sides of the outer end of the salient pole, and generates a gradual inductance by setting a gradual air gap on the pole wings, thereby achieving the purpose of reducing the torque pulsation of the switched reluctance motor. Since the commutation residual angle is increased by at least one time, the radial magnetic attraction is reduced and the tangential magnetic attraction is increased during commutation, so the torque pulsation is effectively improved, and the measured torque pulsation can be reduced by 25%. At the same time, the switching frequency is reduced by at least one time, and the switching efficiency loss is reduced by about 50%. Calculated based on the switching efficiency loss accounting for 5% of the motor system efficiency loss, the motor system efficiency can be improved by 2.5%.

Brief Description of the Drawings

[0024] Figure 1 The present invention is a schematic structural diagram of a working state of a switched reluctance motor having a rotor core with variable air gap pole wings.

[0025] Figure 2 It is a structural schematic diagram of another working state of the switched reluctance motor with a rotor core having variable air gap pole wings according to the present invention.

[0026] Figure 3 It is a schematic structural diagram of a rotor core with variable air gap pole wings according to the present invention.

[0027] The meanings of the markings in the figure are: 10-stator core, 20-rotor core, 21-pole body, 22-pole wing, 23-rotor core yoke. [Specific implementation method]

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following is a detailed description of the present invention through specific embodiments and in combination with the attached drawings. Figure 1-3 It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In order to reduce the torque pulsation of the switched reluctance motor, the present invention provides a switched reluctance motor with a rotor core having a variable air gap pole wing, such as Figure 1 and Figure 2As shown, it includes a stator core 10 and a rotor core 20, the number of phases is q, q≥3, m salient poles are evenly arranged on the stator core 10, n salient poles are evenly arranged on the rotor core 20, n≥2, and m / n=q is set, then the cross-phase switching mechanical angle is A=360° / qn, the rising inductance zone mechanical angle is B=180° / n, and the commutation residual angle is (BA)=(180°-360° / q) / n; the above-mentioned limitation of the stator-rotor pole number ratio will make the number of salient poles of the stator core 10 unchanged, while the number of salient poles of the rotor core 20 is reduced, and the salient pole alignment coefficient is doubled, but if the salient poles of the rotor core 20 are ordinary rectangular salient poles, it will This causes the edge air gap between the edge of the salient pole of the rotor core 20 and the edge of the salient pole of the stator core 10 to be too large, resulting in insufficient torque and excessive peak current. In order to solve this problem, the present invention further improves the salient pole of the rotor core 20. Specifically, the salient poles of the rotor core 20 are all provided with a pole body 21 and a pole wing 22, that is, the middle part of the salient pole of the rotor core 20 is defined as the pole body 21, and it is preferably an ordinary rectangular salient pole shape, the radial inner end of the pole body 21 is connected to the rotor core yoke 23, the left and right sides of the radial outer end of the pole body 21 are connected to the pole wing 22, and the pole wing 22 extends outward away from the pole body 21 to reduce the edge air gap, thereby ensuring that the edge air gap is within a reasonable range. However, under this setting, if the air gap between the pole wing 22 and the salient pole of the stator core 10 is a fixed air gap, a larger variable inductance and variable reluctance cannot be generated. Therefore, the present application creatively makes further improvements to the pole wing 22, and assumes that the air gap between the part of the pole wing 22 closest to the pole body 21 and the salient pole of the stator core 10 is the minimum air gap t1 of the pole wing, and the air gap between the part of the pole wing 22 farthest from the pole body 21 and the salient pole of the stator core 10 is the maximum air gap t2 of the pole wing, t1<t2, and the air gap of the pole wing 22 in the rotation direction is a variable air gap that decreases from t2 to t1, and a gradually changing inductance is generated by the variable air gap, so as to achieve the purpose of normal operation of the switched reluctance motor and reducing the torque pulsation of the switched reluctance motor.

[0030] Due to the above technical improvements, the present invention obtains a new rotor core structure, namely, a rotor core 20 with variable air gap pole wings, which is applied to a q-phase switched reluctance motor with a stator core pole number of m, q ≥ 3, see Figure 3, which includes a rotor core yoke 23 and a rotor core salient pole. The outer side of the rotor core yoke 23 is evenly provided with n salient poles, n≥2, and m / n=q. The rotor core salient poles are all provided with a pole body 21 and a pole wing 22, that is, the middle part of the rotor core salient pole is defined as the pole body 21, and the pole body 21 is preferably an ordinary rectangular salient pole shape. The radial inner end of the pole body 21 is connected to the rotor core yoke 23, and the left and right sides of the radial outer end of the pole body 21 are respectively connected to the pole wing 22. The pole wing 22 extends to the outside away from the pole body 21, and the distance between the radial outer side surface of the pole wing and the center of the rotor core decreases in the extension direction. When the above-mentioned rotor core 20 is applied to a switched reluctance motor, compared with the rectangular salient pole structure, the increase of the pole wing 22 can reduce the edge air gap. By decreasing the distance between the radial outer side of the pole wing and the center of the rotor core, the air gap between the salient pole of the stator core 10 when applied to the switched reluctance motor is a gradually changing variable air gap, thereby generating a gradual inductance, thereby achieving the purpose of reducing the torque pulsation of the switched reluctance motor.

[0031] In some preferred embodiments, the rotor core 20 is optimized, the mechanical angle of the pole body of the rotor core salient pole is C, the mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, the theoretical mechanical angle of the rotor core salient pole is E=180° / m, and 0.6E≤C≤1.3E, 120° / n≤D≤360° / n; thereby concentrating the magnetic poles and optimizing the edge air gap within a reasonable range.

[0032] In some preferred embodiments, the mechanical angle between the outermost edges of the two pole wings 22 on any salient pole of the rotor core 20 is D, and (120° / n+C)≤D≤(360° / nC). The limitation on the size of the angle D ensures that the pole wings 22 have a certain width, and further limits the edge air gap between the edge of the pole wings 22 and the salient pole of the stator core 10 to a reasonable range, so as to ensure the normal operation of the motor and reduce torque pulsation.

[0033] In some preferred embodiments, it is assumed that the air gap of the salient pole body of the rotor core 20 is s, that is, the distance between the outer end of the pole body 21 and the salient pole end of the stator core 10 is s; it is assumed that the air gap at the edge of the pole wing is u, that is, when the stator salient pole is aligned with the rotor slot, the closest distance between the edge of the pole wing 22 and the edge of the adjacent salient pole of the stator core 10 is u; it is assumed that the air gap of the stator yoke is v, that is, the distance between the rotor core yoke 23 and the salient pole end of the stator core 10 is v, then the ratio of the maximum air gap to the minimum air gap of the pole wing is in the range of 3≤t2 / t1≤30, and s≤t1<t2≤u<v is set in the present invention, so that the pole wing air gap is optimized within a reasonable range, ensuring that the peak current, power, etc. are at better values.

[0034] In some preferred embodiments, the radial outer side surface of the pole wing 22 is an arc surface, and the two pole wings 22 on the same salient pole are equal in size, symmetrical in structure and on the same arc surface, the center point of the arc surface is set on the center line of the pole body 21, and the radius r of the arc surface is smaller than the radius R of the rotor core 20. This setting makes the pole wing air gap change evenly and smoothly, thereby making the torque smoother.

[0035] Example 1

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the most common case of switched reluctance motor phase number q=3 is shown.

[0037] Figure 3 The rotor core shown includes a rotor core yoke 23 and a rotor core salient pole. Four rotor core salient poles are evenly arranged on the outside of the rotor core yoke 23. The rotor core salient poles are all provided with a pole body 21 and a pole wing 22, that is, the middle part of the rotor core salient pole is defined as the pole body 21. The pole body 21 is rectangular, and the radial inner end of the pole body 21 is connected to the rotor core yoke 23. The left and right sides of the radial outer end of the pole body 21 are respectively connected to the pole wing 22. The pole wing 22 extends outward away from the pole body 21, and the radial outer side surface of the pole wing 22 is an arc surface. The two pole wings 22 on the same salient pole are equal in size, symmetrical in structure and on the same arc surface. The center point of the arc surface is set on the center line of the pole body 21, and the radius r of the arc surface is smaller than the radius R of the rotor core, so that in the extension direction of the pole wing, the distance between the radial outer side surface of the pole wing and the center of the rotor core changes gradually.

[0038] like Figure 1 , Figure 2As shown, a switched reluctance motor with a rotor core having variable air gap pole wings comprises a stator core 10 and a rotor core 20, the number of phases is q=3, 12 salient poles are evenly arranged on the stator core 10, and 4 salient poles are evenly arranged on the rotor core 20, the number of salient poles of the stator core 10 / the number of salient poles of the rotor core 20=3, then the cross-phase switching mechanical angle is A=360° / qn=30°, the mechanical angle of the rising inductance zone is B=180° / n=45°, and the phase switching residual angle is (BA)=(180°-360° / q) / n=15°, for the existing switched reluctance motor with q=3, the number of salient poles of the stator core is 12, and the number of salient poles of the rotor core is 8, the phase switching mechanical angle is A=15°, the mechanical angle of the rising inductance zone is B=22.5°, and the phase switching residual angle is 7.5°. The phase switching residual angle of this embodiment is doubled. The salient poles of the rotor core 20 are all provided with a pole body 21 and a pole wing 22, that is, the middle part of the salient pole of the rotor core 20 is defined as the pole body 21, the radial inner end of the pole body 21 is connected to the yoke of the rotor core 20, the left and right sides of the radial outer end of the pole body 21 are connected to the pole wing 22, and the pole wing 22 extends outward away from the pole body 21. The air gap between the part of the pole wing 22 closest to the pole body 21 and the salient pole of the stator core 10 is the minimum air gap t1 of the pole wing, and the part of the pole wing 22 farthest from the pole body 21 is the minimum air gap t2 of the pole wing. The air gap between the salient pole of the stator core 10 is the maximum air gap t2 of the pole wing, t1<t2, and the air gap of the pole wing in the rotation direction is a variable air gap that decreases from t2 to t1. Specifically, the radial outer side surface of the pole wing 22 is an arc surface, and the two pole wings 22 on the same salient pole are equal in size, symmetrical in structure and on the same arc surface. The center point of the arc surface is set on the center line of the pole body 21, and the radius r of the arc surface is smaller than the radius R of the rotor core 20.

[0039] Assuming that the mechanical angle of the pole body of the rotor core salient pole is C, the mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, and the theoretical mechanical angle of the rotor core salient pole is E = 180° / m = 15°, then 9≤C≤19.5, 30°≤D≤90°. More preferably, 45°≤D≤75°, and in this embodiment, C=E=15°, D=60° are most preferred.

[0040] In this embodiment, the air gap of the salient pole body of the rotor core is s, the air gap at the edge of the pole wing is u, the air gap at the yoke is v, and the ratio of the maximum air gap to the minimum air gap of the pole wing is in the range of 3≤t2 / t1≤30, and satisfies the condition of s≤t1<t2≤u<v.

[0041] This embodiment reduces the number of rotor core poles and increases the commutation residual angle by setting the stator-rotor core pole number ratio, reduces the edge air gap by adding pole wings on both sides of the outer end of the salient pole, and generates a gradual inductance by setting a gradual air gap on the pole wings, thereby achieving the purpose of reducing the torque pulsation of the switched reluctance motor. Since the commutation residual angle is increased by at least one time, the radial magnetic attraction is reduced and the tangential magnetic attraction is increased during commutation, so the torque pulsation is effectively improved, and the measured torque pulsation can be reduced by 25%. At the same time, the switching frequency is reduced by at least one time, and the switching efficiency loss is reduced by about 50%. Calculated based on the switching efficiency loss accounting for 5% of the motor system efficiency loss, the motor system efficiency can be improved by 2.5%.

[0042] Any invention or creation is to create something new by applying and combining existing technologies. There are infinite possibilities for the primary and secondary judgments of many technical issues and the application and combination of many technical means. The above is only a description of the preferred implementation mode of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A rotor core with variable air gap pole wings, which is applied to a q-phase switched reluctance motor with a stator core pole number of m, q≥3, comprising a rotor core yoke and a rotor core salient pole, characterized in that: The rotor core is evenly provided with n rotor core salient poles, n≥2, and m / n=q, and the rotor core salient poles are all provided with a pole body and a pole wing, that is, the middle part of the rotor core salient pole is defined as the pole body, the radial inner end of the pole body is connected to the rotor core yoke, the left and right sides of the radial outer end of the pole body are respectively connected to the pole wing, the pole wing extends outward away from the pole body, and the distance between the radial outer side surface of the pole wing and the center of the rotor core decreases in the extension direction; the mechanical angle of the pole body of the rotor core salient pole is C, the mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, the theoretical mechanical angle of the rotor core salient pole is E=180° / m, and 0.6E≤C≤1.3E, 120° / n≤D≤360° / n.

2. The rotor core with variable air gap pole wings according to claim 1, characterized in that: The mechanical angle between the outermost edges of the two pole wings on any salient pole of the rotor core is D, and (120° / n+C)≤D≤(360° / nC).

3. The rotor core with variable air gap pole wings according to claim 1, characterized in that: The radial outer side surface of the pole wing is an arc surface. The two pole wings on the same salient pole of the rotor core are equal in size, symmetrical in structure and on the same arc surface. The center point of the arc surface is set on the center line of the pole body, and the radius r of the arc surface is smaller than the radius R of the rotor core.

4. A switched reluctance motor with a rotor core having variable air gap pole wings, comprising a stator core and a rotor core, characterized in that: The number of phases of the switched reluctance motor is q, q≥3, m salient poles are evenly arranged on the stator core, n salient poles are evenly arranged on the rotor core, n≥2, and m / n=q, then the cross-phase switching mechanical angle is A=360° / qn, the rising inductance zone mechanical angle is B=180° / n, the switching residual angle is (BA)=(180°-360° / q) / n, and the salient poles of the rotor core are all provided with a pole body and a pole wing, that is, the middle part of the salient pole of the rotor core is defined as the pole body, the radial inner end of the pole body is connected to the rotor core yoke, the left and right sides of the radial outer end of the pole body are respectively connected to the pole wing, and the pole wing is directed to Extending away from the outer side of the pole body, the air gap between the part of the pole wing closest to the pole body and the salient pole of the stator core is the minimum air gap t1 of the pole wing, and the air gap between the part of the pole wing farthest from the pole body and the salient pole of the stator core is the maximum air gap t2 of the pole wing, t1<t2, and the air gap of the pole wing in the rotation direction is a variable air gap that decreases from t2 to t1; the mechanical angle of the pole body of the salient pole of the rotor core is C, the mechanical angle of the outermost edges of the two pole wings on any salient pole of the rotor core is D, the theoretical mechanical angle of the salient pole of the rotor core is E=180° / m, and 0.6E≤C≤1.3E, 120° / n≤D≤360° / n.

5. A switched reluctance motor with a rotor core having variable air gap pole wings according to claim 4, characterized in that: The mechanical angle between the outermost edges of the two pole wings on any salient pole of the rotor core is D, and (120° / n+C)≤D≤(360° / nC).

6. A switched reluctance motor with a rotor core having variable air gap pole wings according to claim 4, characterized in that: The air gap of the salient pole body of the rotor core is s, the air gap of the pole wing edge is u, and the air gap of the yoke is v. The ratio of the maximum air gap to the minimum air gap of the pole wing is in the range of 3≤t2 / t1≤30, and s≤t1<t2≤u<v.

7. A switched reluctance motor with a rotor core having variable air gap pole wings according to claim 4, characterized in that: The radial outer side surface of the pole wing is an arc surface. The two pole wings on the same salient pole of the rotor core are equal in size, symmetrical in structure and on the same arc surface. The center point of the arc surface is set on the center line of the pole body, and the radius r of the arc surface is smaller than the radius R of the rotor core.

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