CN218352283U - In-wheel motor - Google Patents

Abstract

The utility model belongs to the technical field of electrical equipment and discloses a hub motor. The hub motor includes a stator and a rotor. The stator is provided with a plurality of winding parts, and stator slots are formed between two adjacent winding parts. Stator windings are wound on the upper part, and each stator slot is pierced at least twice by the stator windings. The number of phases of the stator windings is set to be multi-phase, and the rotor is coaxially sleeved on the stator. The rotor includes a rotor ring and a coaxial For the rotor magnetic ring arranged on the rotor ring, the inner peripheral wall of the rotor magnetic ring is provided with a plurality of embedding grooves along the circumferential direction, and permanent magnets are fixedly embedded in the embedding grooves, and the permanent magnets and the rotor magnetic ring can jointly form alternate magnetic poles. The hub motor provided by the utility model effectively reduces the use of NdFeB rare earth, effectively reduces the production, revenue and maintenance costs of the hub motor, and can effectively reduce the harmonic content of the generated magnetomotive force to ensure the working performance of the hub motor .

Description

A hub motor

technical field

The utility model relates to the technical field of motor equipment, in particular to a hub motor.

Background technique

Wheel-hub permanent magnet motors are widely used in the electric two-wheeler market. They use permanent magnet materials with high coercive force and high remanence as the rotor magnetic field. Compared with traditional electric excitation motors, permanent magnet motors have high efficiency and simple structure. , high power density and other significant advantages.

At present, the permanent magnets in the hub motor rotor are mainly made of NdFeB rare earth, but the price of rare earth materials is high. After being applied to the hub motor, the cost of the hub motor will continue to increase, which is not easy for the production, sales and sales of the hub motor. maintain.

Utility model content

The purpose of the utility model is to provide a hub motor, which can reduce the use of rare earth materials in the hub motor and reduce production and maintenance costs.

For this purpose, the utility model adopts the following technical solutions:

A hub motor, comprising:

Stator, the stator is provided with a plurality of winding parts, a stator slot is formed between two adjacent winding parts, a stator winding is wound on each of the winding parts, and each of the stator The slots are pierced at least twice by the stator winding, and the number of phases of the stator winding is set to be multi-phase;

The rotor is coaxially sleeved on the stator. The rotor includes a rotor ring and a rotor magnetic ring coaxially arranged on the rotor ring. slots, permanent magnets are fixedly embedded in the embedding slots, and the permanent magnets and the rotor magnetic ring can jointly form alternating magnetic poles.

Optionally, the polar arc coefficient of the scarfing groove is set to 1.1.

Optionally, the groove depth of the embedding groove is set to 3mm.

Optionally, adhesive glue is provided in the embedding groove, and the permanent magnet is glued to the corresponding embedding groove through the adhesive glue.

Optionally, the matching relationship between the permanent magnet and the engaging groove is an interference fit.

Optionally, the number of phases of the stator windings is set to three phases, which are respectively the first phase winding, the second phase winding and the third phase winding arranged in sequence.

Optionally, each stator slot is pierced 2-4 times by the stator winding.

Optionally, the inner diameter of the stator is set to 164mm-166mm.

Optionally, the outer diameter of the stator is set to 206mm-208mm.

Optionally, the outer diameter of the rotor is set to 225mm-227mm.

Beneficial effect:

In the wheel hub motor provided by the utility model, the rotor includes a rotor ring and a rotor magnetic ring coaxially arranged on the rotor ring. The rotor magnetic ring itself has magnetism. Permanent magnets are fixedly embedded in the connection slot, and the rotor magnetic ring and multiple permanent magnets together form the magnetic core of the hub motor with staggered magnetic pole structure, which effectively reduces the use of permanent magnets compared with the traditional hub motor rotor core. This further reduces the use of NdFeB rare earths in the production process of hub motors, effectively reducing the production, revenue and maintenance costs of hub motors.

In addition, due to the inconsistency of the magnetic flux generated by the rotor magnetic ring and the permanent magnet, the in-wheel motor with the above-mentioned interlaced magnetic pole structure will generate more even-numbered magnetomotive force harmonics than the traditional motor during operation, and the even-numbered The increase of the harmonic content of the magnetomotive force will increase the harmonic loss and affect the working performance of the in-wheel motor. Therefore, the utility model sets each stator slot to be pierced by the stator winding at least twice. According to the test analysis, it can effectively reduce the generated The even-numbered magnetomotive force harmonic content ensures the working performance of the hub motor.

Description of drawings

Fig. 1 is the structural representation of the hub motor stator and rotor of the utility model;

Fig. 2 is a schematic structural view of the rotor magnetic ring of the present invention;

Fig. 3 is a schematic diagram of each stator slot of the unit motor of the present invention being pierced twice by the stator winding;

Fig. 4 is a schematic diagram of each stator slot of the unit motor of the present invention being pierced four times by the stator winding;

Fig. 5 is a schematic diagram of cross punching of the rotor magnetic ring of the present invention.

In the picture:

100. Stator; 110. Winding part; 120. Stator slot; 131. First phase winding; 132. Second phase winding; 133. Third phase winding;

210, rotor magnetic ring; 211, silicon steel punching sheet; 220, embedding groove; 230, permanent magnet.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. In addition, it should be noted that, for the convenience of description, only some structures related to the present utility model are shown in the drawings but not all structures.

In the description of the present utility model, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a Integral; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may include direct contact between the first and second features, and may also include the first and second features being in direct contact with each other. The features are not in direct contact but through another feature between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

This embodiment provides an in-wheel motor. As shown in FIGS. Stator slots 120, each winding portion 110 is wound with a stator winding, and each stator slot 120 is pierced at least twice by the stator winding, the phase number of the stator winding is set to be multi-phase, and the rotor is coaxially sleeved on On the stator 100, the rotor includes a rotor ring (not shown) and a rotor magnetic ring 210 coaxially arranged on the rotor ring. The inner peripheral wall of the rotor magnetic ring 210 is provided with a plurality of embedding grooves 220 along the circumferential direction. The embedding grooves 220 A permanent magnet 230 is fixedly embedded inside, and the permanent magnet 230 and the rotor magnetic ring 210 can jointly form alternate magnetic poles.

In this embodiment, the rotor includes a rotor ring and a rotor magnetic ring 210 coaxially arranged on the rotor ring. The rotor magnetic ring 210 itself is magnetic, and the inner peripheral wall of the rotor magnetic ring 210 is provided with a plurality of embedding grooves 220 along the circumferential direction. , the embedding groove 220 is fixedly embedded with a permanent magnet 230 opposite to the magnetic pole of the rotor magnetic ring 210, and the rotor magnetic ring 210 and a plurality of permanent magnets 230 together form a magnetic core of an in-wheel motor with a staggered magnetic pole structure, which is obtained through test analysis It is known that with the same stator structure size, the permanent magnet 230 material is reduced by 34.78%. Compared with the traditional in-wheel motor rotor core, the use of permanent magnet 230 is effectively reduced, thereby reducing the use of NdFeB rare earths in the in-wheel motor production process. Effectively reduce the production, revenue and maintenance costs of in-wheel motors.

In addition, since the magnetic flux generated by the rotor magnetic ring 210 and the permanent magnet 230 is inconsistent, the in-wheel motor using the above-mentioned interlaced magnetic pole structure will generate more even-numbered magnetomotive force harmonics in the working process compared with the traditional motor, while The increase of the harmonic content of the even-numbered magnetomotive force will increase the harmonic loss and affect the working performance of the in-wheel motor. Therefore, in this embodiment, each stator slot 120 is pierced by the stator winding at least twice. It can be seen from the test analysis that it can effectively Reduce the harmonic content of the generated even-numbered magnetomotive force to ensure the working performance of the hub motor.

In this embodiment, the inner diameter of the stator 100 is set to be 164mm-166mm. In this embodiment, the inner diameter of the stator 100 is preferably set to 165.5 mm.

In this embodiment, the outer diameter of the stator 100 is set to 206mm-208mm. In this embodiment, the outer diameter of the stator 100 is preferably set to 207.3 mm.

In this embodiment, the outer diameter of the rotor is set at 225mm-227mm. In this embodiment, the outer diameter of the rotor is preferably set to 226mm. In this embodiment, the outer diameter of the rotor is the outer diameter of the rotor ring.

In this embodiment, the number of phases of the stator winding is set to three phases, which are the first phase winding 131, the second phase winding 132 and the third phase winding 133 arranged in sequence, and each stator slot 120 is penetrated by the stator winding. Set 2-4 times.

In this embodiment, the number Z of stator slots 120 of the hub motor is set to 60, the number of pole pairs P of the hub motor is set to 54, the number of phases of the hub motor is 3, the pitch is 1, and the first phase The winding 131 , the second phase winding 132 and the third phase winding 133 are separated by 60° phase bands. Note that the unit motor number t is the greatest common divisor of Z and P, and the value is 6. Then in the present embodiment, the quantity Z ₀ of the unit stator slot 120 is calculated according to the formula Z ₀ =Z/t, the value is 9, and the number of motor pole pairs P ₀ is calculated according to the formula P ₀ =P/t, and the numerical value is 5.

Specifically, Fig. 3 shows a schematic diagram in which each stator slot 120 of a unit motor is pierced twice by a stator winding, wherein a set of first phase winding 131, second phase winding 132 and third phase winding 133 are provided, as shown in Fig. 3 are A-phase, B-phase and C-phase respectively, the positive zone of A phase is marked as A+, the negative zone of A phase is marked as A-; the positive zone of B phase is marked as B+, and the negative zone of B phase is marked as B- ; The positive band of C phase is marked as C+, and the negative band of C phase is marked as C-. Fig. 4 is a schematic diagram showing that each stator slot 120 of a unit motor is pierced four times by stator windings, wherein the first phase winding 131, the second phase winding 132 and the third phase winding 133 are arranged in two groups, the first phase winding 133 of each group The first phase winding 131, the second phase winding 132 and the third phase winding 133 are also respectively A phase, B phase and C phase in FIG. It is marked as A-; the positive zone of phase B in one group is marked as B+, the negative zone of phase B is marked as B-; the positive zone of phase C in one group is marked as C+, and the negative zone of phase C is marked as C- ;Another group of A-phase positive zone is marked as A++, A-phase negative zone is marked as A--; another group of B-phase positive zone is marked as B++, B-phase negative zone is marked as B--; A group of C-phase positive bands is marked as C++, and C-phase negative bands are marked as C--.

Table 1 Magnetomotive force harmonic content

Table 1 shows the harmonic content data of the magnetomotive force when the hub motor is working when each stator slot 120 of the unit motor is penetrated twice and four times by the stator winding. As shown in Fig. 3, Fig. 4 and Table 1, when the in-wheel motor has a certain harmonic order, each stator slot 120 of the unit motor is pierced four times by the stator winding, corresponding to the even-numbered magnetomotive force harmonic The content is less than the even-numbered magnetic dynamic harmonic potential content when each stator slot 120 of the unit motor is pierced twice by the stator winding. It can be seen that the more times each stator slot 120 of the unit motor is pierced by the stator winding , the less the magnetomotive force content will be under the corresponding harmonic order, the better the performance of the in-wheel motor will be.

In this embodiment, referring to FIGS. 1-2 , the polar arc coefficient of the embedding groove 220 is set to 1.1, and the groove depth of the embedding groove 220 is set to 3 mm. Specifically, the torque pulse can be weakened to a certain extent by optimizing the pole arc coefficient and the groove depth of the embedding groove 220 . Specifically, with the polar arc coefficient and groove depth of the scarfing groove 220 as variables, the average rotational speed and torque ripple of the in-wheel motor are tested and analyzed.

Table 2 The average speed and torque ripple data of the in-wheel motor corresponding to the scarfing grooves with different pole arc coefficients when the depth of the scarfing groove is 2.3 mm

polar arc coefficient Thickness of embedding groove/mm Average torque/Nm Torque ripple 0.9 2.3 60.82 0.1519 1 (Standard) 2.3 (Standard) 69.28 0.1455 1.1 2.3 73.77 0.1347 1.2 2.3 74.76 0.1493 1.3 2.3 69.68 0.1353 1.4 2.3 59.43 0.1639 1.5 2.3 45.98 0.2787

Table 3 The average speed and torque ripple data of the in-wheel motor corresponding to the scarfing grooves with different pole arc coefficients when the depth of the scarfing groove is 3 mm

According to Table 2 and Table 3, when the pole arc coefficient is set to 1.1 and the groove depth of the scarfing groove 220 is set to 3mm, the average torque of the in-wheel motor is 79.30Nm, and the torque ripple is 0.1332, compared with the pole The arc coefficient is set to 1, and the groove depth of the embedding groove 220 is set to a standard size of 2.3mm, the average torque value is increased by 14.46%, the torque ripple is reduced by 8.45%, and the working performance of the motor is improved. However, under other size combinations of the polar arc coefficient and the groove depth of the scarfing groove 220, at least one set of data indexes of the motor average torque and torque ripple are lower than the corresponding test results under the standard size, so in this embodiment, the polar arc coefficient It is set to 1.1, and the groove depth of the embedding groove 220 is set to 3mm.

As a preferred embodiment, adhesive glue is disposed in the embedding groove 220 , and the permanent magnet 230 is glued to the corresponding embedding groove 220 through the adhesive glue. The setting of adhesive glue can make the fixing between the permanent magnet 230 and the embedding groove 220 more reliable and firm, and enhance the stability.

Furthermore, the matching relationship between the permanent magnet 230 and the embedding groove 220 is an interference fit, so that the permanent magnet 230 can be more firmly embedded in the embedding groove 220 , further ensuring stability.

This embodiment also provides a punching method of the rotor magnetic ring 210 . In this embodiment, the rotor magnetic ring 210 is set as silicon steel. This punching method utilizes punching equipment to punch a complete silicon steel sheet into two sections of silicon steel punching pieces 211. A complete rotor magnetic ring 210 is punched by at least one silicon steel sheet. Sheet 211 composition. Referring to Fig. 5, the embedding grooves 220 on the two sections of silicon steel punches 211 on a silicon steel plate face each other. Punching, so that a complete silicon steel sheet is divided into two parts and punched into two sections of silicon steel punching sheets 211, wherein the concave part of one silicon steel punching sheet 211 on the tooth-shaped punching track is the other silicon steel punching sheet 211 on the tooth The protruding part of the tooth-shaped punching track, and the inward recessed part of each silicon steel punching sheet 211 corresponding to the tooth-shaped punching track can form the embedding groove 220 after further processing. Subsequently, at least one silicon steel punching sheet 211 is subjected to multiple existing processes such as cutting, lamination, and magnetization to form a complete rotor magnetic ring 210 . The test data show that the utilization rate of the silicon steel sheet by the punching method of the rotor magnetic ring 210 provided in this embodiment can reach 71.05%. Compared with the traditional punching method, the utilization rate of the silicon steel sheet is increased by 15.82%, thereby further Improve the utilization rate of silicon steel plates and reduce the raw material consumption of silicon steel plates.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. Various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (10)

1. A hub motor, characterized in that, comprising: A stator (100), the stator (100) is provided with a plurality of winding parts (110), a stator slot (120) is formed between two adjacent winding parts (110), each of the winding parts Stator windings are wound on the part (110), and each of the stator slots (120) is pierced by the stator windings at least twice, and the number of phases of the stator windings is set to be multi-phase; The rotor is coaxially sleeved on the stator, the rotor includes a rotor ring and a rotor magnetic ring (210) coaxially arranged on the rotor ring, and the inner peripheral wall of the rotor magnetic ring (210) is along the circumferential direction A plurality of embedding grooves (220) are opened, and permanent magnets (230) are fixedly embedded in the embedding grooves (220), and the permanent magnets (230) and the rotor magnetic ring (210) can jointly form an interlaced magnetic pole. 2. The in-wheel motor according to claim 1, characterized in that, the pole arc coefficient of the embedding groove (220) is set to 1.1. 3. The in-wheel motor according to claim 2, characterized in that, the groove depth of the embedding groove (220) is set to 3mm. 4. The in-wheel motor according to claim 1, characterized in that adhesive glue is provided in the embedding groove (220), and the permanent magnet (230) passes through the corresponding embedding groove (220) The adhesive is adhesively connected. 5. The in-wheel motor according to claim 4, characterized in that, the fit relationship between the permanent magnet (230) and the embedding groove (220) is an interference fit. 6. The in-wheel motor according to claim 1, characterized in that, the number of phases of the stator windings is set to three phases, which are respectively the first phase winding (131), the second phase winding (132) and A third phase winding (133). 7. The in-wheel motor according to claim 1, characterized in that, each of the stator slots (120) is pierced 2-4 times by the stator winding. 8. The in-wheel motor according to any one of claims 1-7, characterized in that, the inner diameter of the stator (100) is set to 164mm-166mm. 9. The in-wheel motor according to any one of claims 1-7, characterized in that, the outer diameter of the stator (100) is set to 206mm-208mm. 10. The in-wheel motor according to any one of claims 1-7, characterized in that, the outer diameter of the rotor is set to 225mm-227mm.

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