CN112072815A

CN112072815A - High-speed inner rotor motor for electric motorcycle

Info

Publication number: CN112072815A
Application number: CN202011036020.6A
Authority: CN
Inventors: 高超; 陈正平; 刘明亮
Original assignee: Yadea Technology Group Co Ltd
Current assignee: Yadea Technology Group Co Ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2020-12-11

Abstract

The invention belongs to the technical field of electric vehicles, and discloses a high-speed inner rotor motor for an electric motorcycle. This high-speed inner rotor motor for electric motorcycle includes: a stator having a central bore formed therein; the rotor, it can rotate for the stator, the rotor includes the magnetizer, rotation axis and a plurality of magnet steel, the centre bore is worn to locate by the magnetizer, the magnetizer is worn to locate by the rotation axis, be provided with the multiunit magnet steel groove along its circumference in the magnetizer, every group magnet steel groove includes that two are the magnet steel grooves that the V-arrangement structure was arranged, the tip of V-arrangement structure sets up towards the rotation axis, every magnet steel groove is used for holding a magnet steel, and the both ends of every magnet steel inslot wall all are provided with first arch. The small end of the V-shaped structure is arranged towards the rotating shaft, so that the field weakening speed regulation range is wide, and the reluctance torque can be fully utilized. The both ends of every magnet steel inslot wall all are provided with first arch, when playing the limiting displacement to the magnet steel, can also reduce the magnetic leakage and weaken or even offset the harmonic.

Description

High-speed inner rotor motor for electric motorcycle

Technical Field

The invention relates to the technical field of electric vehicles, in particular to a high-speed inner rotor motor for an electric motorcycle.

Background

With the mass market entry of electric vehicles, people have been developing high-power electric motorcycles and electric vehicles to replace fuel vehicles. Compared with the traditional fuel oil automobile, the electric automobile is equivalent to a battery to replace fuel oil and an electric motor to replace an engine. Because the energy density of the battery is far lower than that of fuel oil, if the cost of using a large-capacity battery is too high, the cost of the whole vehicle equipped with the large-capacity lithium battery is increased and is far higher than the prices of a fuel oil motorcycle and a fuel oil automobile. Because the current high-power permanent magnet rotating motor has the problems of large no-load current, low efficiency, small torque, high temperature rise and poor reliability, the power performance and the continuous running capability of the electric vehicle are far lower than those of a fuel vehicle, so that the performance of the motor with the traditional structure cannot be directly suitable for the electric vehicle. Therefore, the battery and the motor are the core of the electric vehicle and are the key for restricting the development of the electric vehicle.

The motor is a widely used product with huge energy consumption, and how to improve the efficiency of the motor and reduce the energy consumption of the motor becomes the development direction of the motor. The high-speed inner rotor motor for the electric motorcycle is frequently used on the existing electric vehicle, because the motor rotates in a high speed, the shaking is easy to occur, and the problem of narrow weak magnetic speed regulation range exists, so that the use performance of the high-speed inner rotor motor for the electric motorcycle is poor.

Disclosure of Invention

The invention aims to provide a high-speed inner rotor motor for an electric motorcycle, which has a wide field weakening speed regulation range, fully utilizes reluctance torque and improves the service performance.

In order to achieve the purpose, the invention adopts the following technical scheme:

a high-speed inner rotor motor for an electric motorcycle, comprising:

a stator having a central bore formed therein;

the rotor, it can rotate for the stator, the rotor includes magnetizer, rotation axis and a plurality of magnet steel, the magnetizer is worn to locate the centre bore, the rotation axis is worn to locate the magnetizer be provided with multiunit magnet steel groove along its circumference in the magnetizer, every group magnet steel groove includes two magnet steel grooves that are the V-arrangement structure and arrange, the tip orientation of V-arrangement the rotation axis sets up, and every magnet steel groove is used for holding one the magnet steel, and every the both ends of magnet steel inslot wall all are provided with first arch.

Preferably, a plurality of first bulges are convexly arranged on the inner wall of one end of the magnetic steel groove, and the first bulges are in a sawtooth shape integrally or in a wave shape integrally.

Preferably, the magnetic rib is arranged in the area between two adjacent groups of V-shaped magnetic steel grooves, and a magnetic isolation bridge is formed between two ends, close to each other, of two magnetic steels arranged in a V-shaped structure.

Preferably, the outer wall of the magnetizer is convexly provided with a plurality of second protrusions, and the second protrusions are in a zigzag shape integrally or in a wave shape integrally.

Preferably, each second protrusion corresponds to one group of magnetic steel grooves, the highest point of each second protrusion is located between two magnetic steels arranged in a V-shaped structure, and the lowest point of each second protrusion is located at the outer sides of two magnetic steels arranged in a V-shaped structure.

Preferably, a plurality of winding slots for accommodating coil windings are provided in the stator along a circumferential direction thereof.

Preferably, a plurality of grooves are formed in the inner wall of the stator along the circumferential direction of the inner wall, and the grooves are in one-to-one correspondence with the wire embedding grooves and are communicated with each other.

Preferably, a plurality of weight-reduction through holes are provided in the magnetic conductor along a circumferential direction thereof.

Preferably, the rotor comprises a plurality of sub-bodies which are stacked along the axial direction of the stator, and two adjacent sub-bodies are connected through a clamping structure.

Preferably, a positioning groove is provided on an outer wall of the stator.

The invention has the beneficial effects that:

according to the high-speed inner rotor motor for the electric motorcycle, the magnetic steel is arranged in a V-shaped structure mode, and the magnetic induction lines are conveniently cut. The small end of the V-shaped structure is arranged towards the rotating shaft, so that the field weakening speed regulation range is wide, and the reluctance torque can be fully exerted. The two ends of the inner wall of each magnetic steel groove are provided with first bulges, the magnetic steel grooves are provided with the bulges, the magnetic steel grooves can limit the magnetic steel, and meanwhile, the magnetic leakage can be reduced, the harmonic wave can be weakened or even offset, so that the centrifugal force of the magnetic steel during rotation can be resisted, and the use performance of the high-speed inner rotor motor for the electric motorcycle can be improved.

Drawings

Fig. 1 is a schematic structural view of a high-speed inner rotor motor for an electric motorcycle according to the present invention.

In the figure:

1. a stator; 2. a rotor; 3. a clamping structure;

11. a wire embedding groove; 12. positioning a groove;

21. a magnetizer; 22. a rotating shaft;

211. a magnetic steel groove; 212. a first protrusion; 213. a second protrusion; 214. a weight-reducing through hole; 215. a magnetic isolation bridge; 216. magnetic ribs.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

This embodiment provides a high-speed inner rotor motor for electric motorcycle, as shown in fig. 1, this high-speed inner rotor motor for electric motorcycle includes stator 1 and rotor 2, stator 1's appearance is the cylinder structure, stator 1 is hollow structure, be provided with the centre bore in stator 1, rotor 2 sets up in the centre bore for stator 1 and the coaxial setting of rotor 2, rotor 2 can rotate for stator 1, cut the magnetic induction line and produce induced electromotive force after the circular telegram, produce electromagnetic torque and carry out energy conversion after acting as the rotating magnetic field.

Rotor 2 includes a plurality of daughter that set up along 1 axis direction stack of stator, be connected through joint structure 3 between two adjacent daughter, the location and the installation of the daughter of being convenient for, when the daughter superposes along rotor 2's axial direction, can with the knot point of a daughter block in rather than the pit of adjacent daughter, knot point and pit can form self-fastening between the two, compare in the mode of the rivet location among the prior art, through the cooperation of knot point and pit, easy operation is convenient, and positioning accuracy is higher.

Every daughter of rotor 2 all includes magnetizer 21, rotation axis 22 and a plurality of magnet steel, the centre bore is worn to locate by magnetizer 21, magnetizer 21 is worn to locate by rotation axis 22, be provided with multiunit magnetic steel groove 211 along its circumference in magnetizer 21, every magnetic steel groove 211 of group includes two magnet steel grooves 211 that are the V-arrangement structure and arrange, every magnetic steel groove 211 is used for holding a magnet steel, make every magnetic steel groove 211 of group realize the installation of two magnet steels, these two magnet steels produce a magnetic pole, the group number of the preferred magnetic steel groove 211 of this embodiment is eight groups, in order to form eight magnetic poles. The magnetic steels are arranged in a V-shaped structure, and the included angle of the magnetic poles of the V-shaped magnetic steel groove is 110-150 degrees.

The permanent magnet synchronous motor with the built-in V-shaped rotor can give consideration to both electromagnetic performance and structural strength, and is more suitable for high-speed operation. For the motor performance, the magnitude of the flux leakage coefficient determines the flux weakening and speed expanding capacity of the motor.

The area between two adjacent groups of V-shaped magnetic steel grooves 211 is called a magnetic rib 216, and a magnetic isolation bridge 215 is formed between two adjacent ends of two magnetic steels arranged in a V-shaped structure. Due to the structural and dimensional limitations of the magnetic isolation bridge 215, the magnetic flux passing through the magnetic isolation bridge 215 is limited, and the magnetic isolation bridge 215 can reach a magnetic saturation state to cause a magnetic blockage phenomenon, so that the rest magnetic force lines cannot pass through the magnetic isolation bridge 215 and can only reach an air gap through a transmission path of the magnetic rib 216 and be transmitted to the stator 1, and the electromagnetic induction is realized. Therefore, by providing the magnetic isolation bridge 215, most of the magnetic flux can be ensured to pass through the transmission path, and the leakage flux can be reduced.

Preferably, a plurality of first protrusions 212 are convexly arranged on the inner wall of one end of the magnetic steel groove 211, and the plurality of first protrusions 212 are in a zigzag shape integrally or in a wave shape integrally. If the inner wall of the magnetic steel slot 211 is a smooth structure, the cancellation of the harmonic wave cannot be realized, and the plurality of first protrusions 212 are integrally zigzag or wavy, so that the effect of canceling the harmonic wave is improved.

Preferably, the length of the side close to each other in the two magnetic steel grooves 211 arranged in a V-shaped structure is greater than the length of the side far away from each other, so that the length of the lower part of the magnetic steel groove 211 is greater than the length of the upper part of the magnetic steel groove 211, the two sides with the shorter distance of the upper part are the same as the basic length of the magnetic steel and are used for clamping the magnetic steel, the lower half part has a longer distance, and the two sides are respectively in an arc shape, thereby effectively reducing the curvature change of the end, so that the stress distribution of the end is more uniform, the stress concentration coefficient is lower, and the stress; the two circular arc shapes form air grooves on two sides, so that the pole arc coefficient of the motor can be reduced. It can be understood that, regarding the performance of the motor, the magnitude of the leakage magnetic coefficient determines the flux weakening and speed expansion capability of the motor, and the inter-pole leakage magnetic flux generally increases along with the increase of the pole arc coefficient.

Further, a plurality of second protrusions 213 are convexly disposed on the outer wall of the magnetic conductor 21, and the plurality of second protrusions 213 are all saw-toothed as a whole or are all wavy as a whole. The second protrusions 213 are uniformly and continuously arranged on the outer wall of the magnetizer 21 along the circumferential direction of the magnetizer, and an unequal air gap structure is formed between the stator 1 and the rotor 2, so that the air gap magnetic flux density distribution under the magnetic steel arranged inside the magnetizer 21 is close to a sine wave, the torque ripple during the cogging torque and the load is favorably reduced, the stability of the high-speed inner rotor motor for the electric motorcycle is improved, and the noise is reduced. The second protrusions 213 are provided to change the shape of the circumferential surface of the rotor 2, thereby locally reducing the air gap, optimizing the permeance waveform of the air gap, suppressing harmonic components in the permeance waveform of the air gap, and also suppressing harmonic components of the magnetic field strength of the air gap, thereby improving the sine property of the waveform of the magnetic field strength of the air gap. In addition, by providing the second protrusions 213 and the recesses between two adjacent second protrusions 213, the magnetic conductance waveform of the air gap and the magnetic field strength waveform of the air gap can be more finely adjusted.

Further, each second protrusion 213 corresponds to one group of magnetic steel slots 211, the highest point of the second protrusion 213 is located between two magnetic steels arranged in a V-shaped structure, and the lowest point of the second protrusion 213 is located outside the two magnetic steels arranged in a V-shaped structure.

If the mass of the magnetic conductor 21 is large, the rotor 2 may shake during rotation, and to solve this problem, a plurality of weight-reducing through holes 214 are provided in the magnetic conductor 21 along the circumferential direction thereof for reducing magnetic leakage, and it is preferable in this embodiment that the number of the weight-reducing through holes 214 is eight, and the weight-reducing through holes 214 have a circular structure. The weight-reducing through hole 214 is formed in the magnetizer 21, so that the function of reducing the weight of the magnetizer 21 is achieved, and the requirement of light weight is met.

Further, be provided with constant head tank 12 on the outer wall of stator 1 for stator 1 is the location when the assembly, to prevent that stator 1 from appearing rotating, fixed spacing effectual. A plurality of wire embedding grooves 11 are formed in the stator 1 along the circumferential direction of the stator, the wire embedding grooves 11 are used for accommodating coil windings, and the wire embedding grooves 11 play a role in fixing and embedding the coil windings. The number of the embedding slots 11 is preferably 12, and three-phase coil windings are connected in parallel to form four paths.

Further, a plurality of grooves are formed in the inner wall of the stator 1 along the circumferential direction of the stator, and the grooves and the wire embedding grooves 11 are arranged in a one-to-one correspondence manner and are communicated with each other. In the inner circumferential surface of the stator 1, at least one rectangular or arc-shaped groove is formed in the surface of each stator 1, the width of each groove is equal to the width of the notch of the embedded wire groove 11, the arrangement direction of each groove is parallel to the notch of the embedded wire groove 11, the grooves in the surface of the stator 1 are uniformly distributed at equal intervals along the circumferential direction of the stator 1, the number of fundamental wave cycles of the cogging torque of the stator 1 is increased, and the grooves can generate new cogging torque to compensate the original cogging torque, so that the amplitude of the total cogging torque is reduced.

Further, be provided with the pivot mounting hole on magnetizer 21, be equipped with the arch in the inner wall of pivot mounting hole is protruding, and rotation axis 22 corresponds the arch and is provided with the keyway, and protruding joint plays fixed and spacing effect in the keyway. The key groove has an angle deviation with the center of the V-shaped arrangement magnetic steel, so that a required magnetic pole angle is generated when the rotor 2 is subjected to pole staggering partitioning, namely, the angle deviation exists between the central line of the rotating shaft 22 and the central line of the magnetic steel groove 211, and the oblique pole angle of the whole rotor 2 can be 5-10 degrees. The sub-body iron of the rotor 2 is formed by buckling and pressing silicon steel sheets with the thickness of about 0.35mm, and is generally divided into 4-5 sections, each section is obtained by overlapping silicon steel sheets with the same oblique polar angle, the oblique polar angle of the silicon steel sheets between the two adjacent sections is increased by 1-2 degrees, and the oblique polar angle of the whole rotor 2 core is 5-10 degrees. The rotor 2 can effectively weaken tooth harmonic waves by segmented oblique poles, so that the cogging torque and the torque ripple of the motor are improved.

The high-speed inner rotor motor for the electric motorcycle has the advantages of simple structure, reliable operation, small volume, light weight, small loss, high efficiency, small noise, easy change of the shape and the size of the motor and the like, thereby being widely used in various fields.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A high-speed inner rotor motor for an electric motorcycle, comprising:

a stator (1) having a center hole formed therein;

rotor (2), it can rotate for stator (1), rotor (2) include magnetizer (21), rotation axis (22) and a plurality of magnet steel, magnetizer (21) are worn to locate the centre bore, rotation axis (22) are worn to locate magnetizer (21) be provided with multiunit magnetic steel groove (211) along its circumference in magnetizer (21), every magnetic steel groove (211) of group includes two magnetic steel grooves (211) that are the V-arrangement structure and arrange, the tip orientation of V-arrangement structure rotation axis (22) set up, and every magnetic steel groove (211) are used for holding one magnet steel, and every the both ends of magnetic steel groove (211) inner wall all are provided with first arch (212).

2. The high-speed inner rotor motor for the electric motorcycle according to claim 1, wherein a plurality of first protrusions (212) are protruded from an inner wall of one end of the magnetic steel slot (211), and the plurality of first protrusions (212) are all saw-toothed as a whole or are all wavy as a whole.

3. The high-speed inner rotor motor for the electric motorcycle according to claim 1 or 2, wherein the magnetic rib (216) is arranged in the area between two adjacent groups of the V-shaped magnetic steel slots (211), and a magnetic isolation bridge (215) is formed between two ends close to each other in two magnetic steels arranged in a V-shaped structure.

4. The high-speed inner rotor motor for the electric motorcycle of claim 1, wherein a plurality of second protrusions (213) are convexly arranged on the outer wall of the magnetizer (21), and the plurality of second protrusions (213) are saw-toothed as a whole or wavy as a whole.

5. The high-speed inner rotor motor for the electric motorcycle of claim 4, wherein each second protrusion (213) is disposed corresponding to a set of magnetic steel slots (211), a highest point of the second protrusion (213) is located between two magnetic steels arranged in a V-shaped structure, and a lowest point of the second protrusion (213) is located outside the two magnetic steels arranged in a V-shaped structure.

6. The high-speed inner rotor motor for an electric motorcycle according to claim 1, wherein a plurality of caulking grooves (11) are provided in the stator (1) along a circumferential direction thereof, the caulking grooves (11) accommodating coil windings.

7. The high-speed inner rotor motor for an electric motorcycle according to claim 6, wherein a plurality of grooves are provided in an inner wall of the stator (1) along a circumferential direction thereof, and the plurality of grooves and the plurality of caulking grooves (11) are provided in one-to-one correspondence and communicate with each other.

8. The high-speed inner rotor motor for an electric motorcycle according to claim 1, wherein a plurality of weight-reduction through holes (214) are provided in said magnetic conductor (21) along a circumferential direction thereof.

9. The high-speed inner rotor motor for the electric motorcycle according to claim 1, wherein the rotor (2) comprises a plurality of sub-bodies which are stacked along the axial direction of the stator (1), and adjacent two sub-bodies are connected by a clamping structure (3).

10. The high-speed inner rotor motor for an electric motorcycle according to claim 1, wherein a positioning groove (12) is provided on an outer wall of the stator (1).