Double-gap positioning magnetic steel type salient pole hub motor

Abstract

The utility model relates to a double-gap positioning magnetic steel type salient pole hub motor, which comprises a rotor iron core, a plurality of mounting grooves are arranged on the rotor iron core, magnetic steel is embedded in the mounting grooves, a plurality of groups of antipodes are formed by the magnetic steel, magnetic isolation bridges are arranged at the mounting grooves of each group of antipodes, and limiting structures are symmetrically arranged at two ends of each mounting groove. The magnetic isolation bridge is used for positioning magnetic steel and comprises antipodal magnetic isolation bridges which are arranged between two groups of mounting grooves which are antipodal mutually, a first magnetic isolation bridge, a second magnetic isolation bridge and a third magnetic isolation bridge, the first magnetic isolation bridge is arranged at the end, deviating from each other, of the two mounting grooves located at the same pole and close to the inner wall of a rotor core, the second magnetic isolation bridge is arranged at the end, close to each other, of the two mounting grooves located at the same pole and faces the outer wall of the rotor core, and the third magnetic isolation bridge is arranged between the two groups of mounting grooves which are antipodal mutually. The two mounting grooves are mutually close to each other. The magnetic steel is matched with the magnetic isolation bridge, so that the power, the torque and the rotating speed can be effectively improved. The optimized magnetic circuit can effectively reduce the use amount of magnetic steel.

Description

TECHNICAL FIELD

[0001] The utility model relates to wheel hub motor technical field especially a double gap positioning magnetic steel type salient pole wheel hub motor. BACKGROUND

[0002] Wheel hub type permanent magnet synchronous motor is widely used in electric two-wheel car, and is mostly surface-mounted magnetic steel outer rotor structure. The direct axis and cross axis inductance of surface-mounted wheel hub motor are similar, cannot fully utilize reluctance torque, vector control is difficult, and the magnetic circuit is saturated. This leads to that the wheel hub motor has excellent performance in low speed area, but has weak overload capacity and high loss in high speed area.

[0003] With the development of two-wheel car to electric light motorcycle and electric motorcycle, the driving motor needs to provide greater power, torque and speed. In order to fully utilize reluctance torque, a magnetic steel spoke type salient pole motor appears, but this salient pole motor uses more magnetic steel, and the rotor core and magnetic steel are arranged in blocks, so the process cost is high. SUMMARY

[0004] In view of the above-mentioned shortcomings in the prior art, the present application provides a double gap positioning magnetic steel type salient pole wheel hub motor with a reasonable structure, which simplifies the production process and reduces the cost without affecting the performance of the motor.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A double gap positioning magnetic steel type salient pole wheel hub motor comprises a rotor core, a plurality of installation grooves are arranged on the rotor core, and a magnetic steel is embedded in each installation groove. The magnetic steels are arranged in a plurality of groups of opposite poles,

[0007] A magnetic separation bridge is arranged at the installation groove of each group of opposite poles, and a limiting structure is symmetrically arranged at both ends of each installation groove to position the magnetic steel,

[0008] The magnetic separation bridge comprises:

[0009] The magnetic separation bridge is arranged between two installation grooves which are opposite poles,

[0010] The first magnetic separation bridge is located at the end of the two installation grooves of the same pole which are away from each other and close to the inner wall of the rotor core,

[0011] The second magnetic separation bridge is located at the end of the two installation grooves of the same pole which are close to each other and face the outer wall of the rotor core,

[0012] The third magnetic separation bridge is located between the end of the two installation grooves which are close to each other.

[0013] As a further improvement of the above technical scheme:

[0014] The limiting structure comprises a shoulder extending from the rotor core, and the second magnetic isolation bridge is integrally formed with the shoulder.

[0015] The shoulder abuts against the end surface of the magnetic steel.

[0016] The mounting groove comprises a linear middle section, and the limiting structure is arranged at both ends of the middle section and forms an angle with the middle section; the magnetic steel is gap-fitted with the mounting groove.

[0017] The limiting structure further comprises an injection-filling gap, and the shoulder divides the injection-filling gap into a first gap and a second gap.

[0018] The space of the first gap is larger than that of the second gap.

[0019] The width of the magnetic isolation bridge ranges from 1 to 2 times of the thickness of the rotor core.

[0020] The rotor core is integrally formed of a silicon steel sheet.

[0021] The included angle between a group of magnetic steels with the same polarity ranges from 75° to 105°.

[0022] The gap between the magnetic steel and the mounting groove is filled with an injection material.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model adopts a whole silicon steel sheet outer rotor, which is convenient for connection with a hub,

[0025] The utility model adopts an embedded magnetic steel, which is convenient for magnetic steel installation; the two ends of the mounting groove of the magnetic steel are respectively provided with shoulder structures, which abut against and limit the end part of the magnetic steel, so that the magnetic steel can be reliably fixed; each group of magnetic steels is arranged in a V shape and is matched with a magnetic isolation bridge, which can effectively improve power, torque and rotating speed. Compared with the magnetic steel structure in the prior art, the above-mentioned optimized magnetic circuit can effectively reduce the amount of magnetic steel; compared with a salient pole motor with a magnetic steel spoke arrangement, the utility model uses less magnetic steel. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of the rotor core of the utility model.

[0027] Figure 2 It is one section of the rotor core of the utility model, which is used for reflecting the design of the mounting groove.

[0028] Figure 3 It is one section of the rotor core of the utility model, which is used for reflecting the assembly relationship between the mounting groove and the magnetic steel in the groove.

[0029] Wherein: 1, rotor core; 2, mounting groove; 3, magnetic steel;

[0030] 201. Intermediate section; 202. Shoulder; 203. Injection filling gap; 204. First gap; 205. Second gap; 206. Opposite magnetic bridge; 207. First magnetic bridge; 208. Second magnetic bridge; 209. Third magnetic bridge. Detailed Implementation

[0031] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0032] like Figures 1-3 As shown, the dual-gap positioning magnet 3-type salient pole hub motor of this embodiment includes a rotor core 1, a plurality of mounting slots 2 are provided on the rotor core 1, and magnets 3 are embedded in the mounting slots 2. The magnets 3 form a plurality of pairs of poles.

[0033] Each pair of poles has a magnetic bridge at its mounting slot 2, and each mounting slot 2 has symmetrical limit structures at both ends for positioning the magnet 3.

[0034] Magnetic bridges include:

[0035] The opposing magnetic bridge 206 is positioned between two sets of mounting slots 2 that are opposite poles.

[0036] The first magnetic isolation bridge 207 is located at the opposite ends of the two mounting slots 2 on the same pole, and is close to the inner wall of the rotor core 1.

[0037] The second magnetic isolation bridge 208 has two mounting slots 2 on the same pole that are close to each other and face the outer wall of the rotor core 1.

[0038] The third magnetic isolation bridge 209 is located between the two mounting slots 2 at their close ends.

[0039] The limiting structure includes a shoulder 202 extending from the rotor core 1, and the second magnetic bridge 208 is integrally formed with the shoulder 202.

[0040] Shoulder 202 abuts against the end face of magnet 3.

[0041] The mounting groove 2 includes a straight middle section 201, with limiting structures located at both ends of the middle section 201 and set at an angle with the middle section 201; the magnet 3 is clearance-fitted with the mounting groove 2.

[0042] The limiting structure also includes an injection filling gap 203, and a shoulder 202 divides the injection filling gap 203 into a first gap 204 and a second gap 205.

[0043] The space of the first gap 204 is larger than the space of the second gap 205.

[0044] The width of the magnetic bridge is between 1 and 2 times the thickness of the rotor core material.

[0045] The rotor core 1 is a one-piece molded silicon steel sheet.

[0046] The included angle between a group of magnets with the same pole 3 ranges from 75° to 105°.

[0047] The gap between the magnet 3 and the mounting groove 2 is filled with injection molding material.

[0048] The specific structure and working principle of this utility model are as follows:

[0049] like Figure 1 The figure shows the front view of the rotor core 1. The multiple V-shapes at the circumference position in the figure are multiple sets of magnets 3.

[0050] The specific mounting structure of magnet 3 on rotor core 1 is as follows:

[0051] like Figure 2 As shown, this is a section of the rotor core 1. The rotor core 1 is made of one-piece molded silicon steel sheet for connection with the hub. Mounting slots 2 are provided on the rotor core 1. Two mounting slots 2 form a group, and multiple groups of mounting slots 2 are arranged in a circular array on the rotor core 1 with the outer circle center of the rotor core 1 as the reference.

[0052] A set of mounting slots 2 consists of two mounting slots 2, which are set at an angle with the opening of the angle facing the center of the rotor core 1. After the magnets 3 are installed, one set of magnets 3 is one pole, and the adjacent set of magnets 3 is the other pole. The adjacent two poles have opposite polarities, forming a pair of poles. There are multiple pairs of poles on the entire rotor core 1.

[0053] One set of mounting slots 2 and the magnets 3 within them are symmetrical structures, with the center line of symmetry passing through the center of the rotor core 1. Two sets of mounting slots 2 and the magnets 3 within them, which are opposite poles, are also symmetrical structures, with the center line of symmetry passing through the center of the rotor core 1.

[0054] like Figure 3 As shown, each mounting groove 2 includes a straight middle section 201 and limiting structures formed at both ends of the middle section 201. The limiting structures are symmetrically arranged at both ends of the middle section 201. Each limiting structure includes a shoulder 202 extending from the rotor core 1. The shoulder 202 extends in an angular shape with a rounded top corner, and abuts against the magnet 3. Each limiting structure also has an injection-molded filling gap 203 for assisting in positioning the magnet 3.

[0055] The top corner of the shoulder 202 divides the injection filling gap 203 into a first gap 204 and a second gap 205, with the space of the first gap 204 being larger than that of the second gap 205. The sidewalls of both the first gap 204 and the second gap 205 are set at an obtuse angle to the middle section 201, making both the first gap 204 and the second gap 205 approach a triangle. This structure facilitates injection molding, reducing the surface area that the plastic needs to flow through and making it easier to fill without air bubbles. On the other hand, it can utilize the stability of the triangle to provide reliable positioning and the overall structure provides good thermal conductivity. Furthermore, this structure can provide a complete magnetic circuit, breaking the larger gap into smaller gaps, thereby reducing magnetic leakage.

[0056] Each magnet 3 is a cubic magnet filled within the middle section 201. The edges of the magnet 3 are rounded to reduce stress concentration during and after assembly. The sidewalls and sides of the magnet 3 are in contact with the surface of the middle section 201 of the mounting groove 2 for effective contact and heat dissipation. For ease of assembly, the magnet 3 and the mounting groove 2 are fitted with a clearance fit, and subsequent positioning is achieved through injection molding.

[0057] To reduce magnetic leakage, a magnetic isolation bridge is also involved around the magnet slot 3. The magnetic isolation bridge includes:

[0058] A magnetic bridge 206 is installed between two sets of mounting slots 2 that are opposite poles.

[0059] Located in mounting slot 2 at the same pole:

[0060] The first magnetic isolation bridge 207 is located in the two mounting slots 2 near the inner wall of the rotor core 1. The shape of the first magnetic isolation bridge 207 tends to be strip-shaped.

[0061] The second magnetic isolation bridge 208 is located at the end of the two mounting slots 2 that are close to each other, facing the outer wall of the rotor core 1 on the shoulder 202, and is integrally formed with the shoulder 202, with a shape that tends to be triangular.

[0062] The third magnetic isolation bridge 209 is located between the two mounting slots 2 at their close ends and has a strip-like shape.

[0063] That is, a set of mutually opposing magnets 3 structure has: one opposing magnetic isolation bridge 206, two first magnetic isolation bridges 207, two second magnetic isolation bridges 208, and one third magnetic isolation bridge 209, for a total of six magnetic isolation bridges. Considering the magnetic isolation effect, processing quality and mold life, the narrowest width of the magnetic isolation bridge is required to be 1 to 2 times the thickness of the silicon steel sheet.

[0064] As a preferred embodiment of this application, the motor torque is greater when the included angle of a set of magnets 3 with the same pole is between 75 degrees and 105 degrees. Therefore, the included angle range of a set of magnets 3 is 75°-105°.

[0065] The application has the advantages of simplifying the production process, reducing the amount of the magnetic steel 3 of the salient pole motor, and effectively improving the motor power, torque and rotating speed.

[0066] The above description is an explanation of the utility model, not a limitation of the utility model, the range defined by the utility model is shown in the claim, and any form of modification can be made within the protection range of the utility model.

Claims

1. A double-gap permanent magnet Vernier motor with salient pole rotor, comprising a rotor core (1), characterized in that: The rotor core (1) is provided with a plurality of installation grooves (2), and a magnetic steel (3) is embedded in each installation groove (2), and the magnetic steels (3) form a plurality of groups of pole pairs, Each installation groove (2) is provided with a magnetic isolation bridge, and a limiting structure is symmetrically arranged at both ends of each installation groove (2) to position the magnetic steel (3), The magnetic isolation bridge comprises: A pole pair magnetic isolation bridge (206) is arranged between two groups of installation grooves (2) that are pole pairs of each other, A first magnetic isolation bridge (207) is located at the mutually facing away ends of two installation grooves (2) of the same pole and is close to the inner wall of the rotor core (1), A second magnetic isolation bridge (208) is located at the mutually facing ends of two installation grooves (2) of the same pole and faces the outer wall of the rotor core (1), A third magnetic isolation bridge (209) is located between the mutually facing ends of two installation grooves (2).

2. The dual gap located magnetic steel salient pole wheel hub motor of claim 1, wherein: The limiting structure comprises a shoulder (202) extending from the rotor core (1), and the second magnetic isolation bridge (208) is integrally formed with the shoulder (202).

3. The dual gap located magnetic steel salient pole wheel hub motor of claim 2, wherein: The shoulder (202) abuts against the end face of the magnetic steel (3).

4. The dual gap located magnetic steel salient pole wheel hub motor of claim 1, wherein: The installation groove (2) comprises a linear middle section (201), the limiting structure is arranged at both ends of the middle section (201) and is arranged at an angle with the middle section (201), and the magnetic steel (3) is gap-fitted with the installation groove (2).

5. The dual gap located magnetic steel salient pole wheel hub motor of claim 2, wherein: The limiting structure further comprises an injection filling gap (203), and the shoulder (202) divides the injection filling gap (203) into a first gap (204) and a second gap (205).

6. The dual gap located magnetic steel salient pole wheel hub motor of claim 5, wherein: The space of the first gap (204) is larger than that of the second gap (205).

7. The dual gap located magnetic steel salient pole wheel hub motor of claim 1, wherein: The width of the magnetic isolation bridge ranges from 1 to 2 times the thickness of the rotor core (1).

8. The dual gap located magnetic steel salient pole wheel hub motor of claim 7, wherein: The rotor core (1) is an integrally formed silicon steel sheet.

9. The dual gap located magnetic steel salient pole wheel hub motor of claim 1, wherein: The included angle between a group of same-pole magnetic steels (3) ranges from 75° to 105°.

10. The dual gap located magnetic steel salient pole wheel hub motor of claim 4, wherein: The gap between the magnetic steel (3) and the installation groove (2) is filled with an injection material.

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