阅读说明：本技术 一种低惯量高过载永磁电机 (Low-inertia high-overload permanent magnet motor ) 是由 季汉川 韩光鲜 于 2018-06-22 设计创作，主要内容包括：本发明涉及一种低惯量高过载永磁电机,包括定子、转子和绕组,所述的转子是外径按照电机自身惯量与负载惯量比值为0.8～2来设计的转子,所述的定子还包括极柱,所述极柱的斜边与中心线形成一角度为θ,且θ＞0°。与现有技术相比,本发明通过惯量匹配的原则设计,可以使电机在所在惯量负载系统中能够输出效率最大化,定子极柱采用梯形或者其他变种方法,3倍过载时至少能够提高过载转矩5％以上,且过载倍数越高,提升越明显等优点。(The invention relates to a low-inertia high-overload permanent magnet motor which comprises a stator, a rotor and a winding, wherein the rotor is designed according to the condition that the ratio of the inertia of the motor to the load inertia is 0.8-2, the stator further comprises a pole, an angle formed by the inclined edge of the pole and the central line is theta, and the theta is larger than 0 degree. Compared with the prior art, the motor has the advantages that the output efficiency of the motor in an inertia load system can be maximized through the principle design of inertia matching, the stator pole posts adopt a trapezoidal or other variant method, the overload torque can be at least improved by more than 5% when the overload is carried out by 3 times, the higher the overload multiple is, the more obvious the improvement is, and the like.)

1. The utility model provides a low inertia height overload permanent-magnet machine, includes stator (20), rotor and winding (24), characterized in that, the rotor be the rotor that the external diameter was designed for 0.8 ~ 2 according to motor inertia and load inertia ratio, stator (20) still include utmost point post (21), the hypotenuse of utmost point post (21) forms an angle for theta with the central line, and theta > 0.

2. A low inertia high overload permanent magnet motor according to claim 1 wherein the pole is trapezoidal in shape.

3. A low-inertia high-overload permanent-magnet motor according to claim 2, wherein the pole is in a trapezoidal structure with a wide top and a narrow bottom.

4. A low-inertia high-overload permanent-magnet motor according to claim 1, wherein the pole is stepped.

5. A low-inertia high-overload permanent-magnet motor according to claim 4, wherein the pole is shaped as a stepped structure with a wide top and a narrow bottom.

6. A low inertia high overload permanent magnet machine according to claim 1 wherein the rotor includes a shaft (22) and magnetic steel (23).

7. A low inertia high overload permanent magnet motor according to claim 1 wherein the angular range θ is: theta is more than 0 degree and less than 10 degrees.

8. A low inertia high overload permanent magnet motor according to claim 1 or claim 7, wherein θ is calculated by maximizing the motor output torque at N times the rated current.

9. A low inertia high overload permanent magnet motor according to claim 1, wherein as the outer diameter of the rotor decreases, the inner diameter of the stator (20) decreases accordingly, the poles (21) lengthen and the stator slot area between the poles (21) increases.

Technical Field

The invention relates to the field of permanent magnet motors, in particular to a low-inertia high-overload permanent magnet motor.

Background

The permanent magnet synchronous motor is a synchronous motor which generates a synchronous rotating magnetic field by permanent magnet excitation, the permanent magnet is used as a rotor to generate a rotating magnetic field, and a three-phase stator winding is reacted through an armature under the action of the rotating magnetic field to induce three-phase symmetrical current. Permanent magnet synchronous motor, along with its application field's continuous extension at present, also more and more various to its suitability with the system requirement. Compared with a general permanent magnet motor, the low-inertia high-overload permanent magnet motor is more suitable for the following working conditions: the motor drives a light inertia load, high-frequency positive and negative rotation and acceleration and deceleration are required, the system response is required to be fast, and high overload performance is required, such as a reciprocating yarn poking mechanism for an automatic winder in the textile industry.

Thus, the requirements on the performance of the motor are completely different from the common working conditions.

The structural section of the existing permanent magnet motor (including brushless and permanent magnet synchronous) is shown in the attached figure 1 of the specification, which comprises: stator 20, pivot 22, magnet steel 23, winding 24. When the permanent magnet motor is under high acceleration and deceleration, the input torque of the permanent magnet motor with the structural section is insufficient under the condition of the same given current, and the permanent magnet motor cannot bear high overload.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a permanent magnet motor with low inertia and high overload.

The purpose of the invention can be realized by the following technical scheme:

the low-inertia high-overload permanent magnet motor comprises a stator, a rotor and a winding, wherein the rotor is designed with the outer diameter of 0.8-2 according to the ratio of the inertia of the motor to the load inertia, the stator further comprises a pole, an angle theta is formed between the inclined edge of the pole and a central line, and the angle theta is larger than 0 degree.

Preferably, the pole is in a trapezoidal structure.

Preferably, the pole is in a trapezoidal structure with a wide upper part and a narrow lower part.

Preferably, the pole is in a stepped structure.

Preferably, the pole is in a stepped structure with a wide upper part and a narrow lower part.

Preferably, the rotor comprises a rotating shaft and magnetic steel.

Preferably, the angle θ range is: theta is more than 0 degree and less than 10 degrees.

Preferably, the θ is obtained by a calculation principle of maximizing the output torque of the motor at N times of the rated current.

Preferably, as the outer diameter of the rotor is reduced, the inner diameter of the stator is correspondingly reduced, the pole posts are lengthened, and the area of the stator slots between the pole posts is increased.

Compared with the prior art, the invention has the following advantages:

(1) through the principle design of inertia matching, the output efficiency of the motor in the inertia load system can be maximized.

(2) The stator pole adopts a trapezoidal or other variant method, the overload torque can be improved by more than 5% at least when the overload is carried out by 3 times, and the higher the overload multiple is, the more obvious the improvement is.

Drawings

To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. Also, the relative positions and sizes of the respective portions shown in the drawings are exemplary, and should not be understood as uniquely determining positional or dimensional relationships between the respective portions.

Fig. 1 is a cross-sectional view of a permanent magnet motor according to the prior art.

Fig. 2 is a cross-sectional view of the structure of an embodiment 1 of the low-inertia high-overload permanent magnet motor of the invention.

Fig. 3(a) is a schematic diagram of a pole structure of a low-inertia high-overload permanent magnet motor in embodiment 1 of the present invention.

Fig. 3(b) is a schematic structural view of a prior art pole.

Fig. 4 is a graph comparing the performance of a low-inertia high-overload permanent magnet motor according to the present invention with that of a conventional permanent magnet motor.

Fig. 5(a) is a schematic structural diagram of the whole mechanism of an embodiment 2 of a low-inertia high-overload permanent magnet motor according to the present invention.

Fig. 5(b) is a schematic diagram of a pole structure of a low-inertia high-overload permanent magnet motor in embodiment 2 of the present invention.

The reference numbers illustrate:

20 is stator, 21 is pole, 22 is rotation axis, 23 is magnetic steel, 24 is winding.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

As shown in fig. 2, which is embodiment 1 of the present invention, the low-inertia high-overload permanent magnet motor of the present invention includes a rotor 22, a stator 20, magnetic steel 23, and a winding 24, wherein an outer diameter of the rotor 22 is designed according to a principle that a ratio of inertia of the motor to load inertia is 0.8-2, the stator 20 further includes a pole 21, an angle θ is formed between a bevel edge of the pole 21 and a center line, and θ is greater than 0 ° and less than 10 °. Rotor 22 outer diameter design by load inertia I_loadEnsuring total inertia I of rotor 22_rotor＝0.8I_load～2I_loadTherefore, the efficiency of the motor output to a load system during operation can be maximized, the outer diameter of the rotor 22 is reduced, the inner diameter of the iron core of the stator 20 is correspondingly reduced, the pole posts 21 are lengthened on the basis of a common permanent magnet motor, and the area of the stator slots between the pole posts is increased. The stator slot area can hold more windings than the permanent magnet motor with the same stator inner diameter, and the copper loss of the motor during operation is reduced.

As shown in fig. 3(a), 3(b) and 4, the pole 21 has a trapezoidal structure with a wide top and a narrow bottom. Under the condition that the motor slot area (or the stator sectional area or the material area) is not changed, the pole width of a near motor air gap section (or a rotor end) is reduced, and the pole width of a far air gap section is increased, namely, the angle theta of the inclined edge of a trapezoidal pole of the stator is required (theta is more than 0 degree, and the theta of a general permanent magnet motor is 0 degree). The design can reduce the saturation degree of the far air gap section which is easy to be magnetically saturated in the pole, so that the aim of improving the torque of the motor under the condition of high current and high overload is fulfilled, and the bevel angle theta is obtained by the calculation principle of maximizing the output torque of the motor under the condition of N times of rated current.

As shown in fig. 5(a) and 5(b) which are the embodiment 2 of the present invention, the shape of the pole is changed to a step-like structure, which is a variation of the present invention, and the above-mentioned effects can be achieved.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.