WO2009006796A1

WO2009006796A1 - Stepping motor having a stator with distal paired auxiliary magnetic poles

Info

Publication number: WO2009006796A1
Application number: PCT/CN2008/001291
Authority: WO
Inventors: Chenglung Lee
Original assignee: Chenglung Lee
Priority date: 2007-07-10
Filing date: 2008-07-09
Publication date: 2009-01-15
Also published as: CN101127475B; CN101127475A

Abstract

A stepping motor having a stator (5, 5', 5”) with distal paired auxiliary magnetic poles (58, 58', 58”). The motor includes a rotor (3, 3', 3”) having multiple magnetic poles (32, 32', 32”) arranged along its circumference at equal intervals and a stator (5, 5', 5”). The stator (5, 5', 5”) includes: two sets of main magnetic poles (54, 54', 54”) with a body (50, 50', 50”) and a coil (52, 52', 52”) respectively, and when one of the two sets of main magnetic poles (54, 54', 54”) faces a rotor magnetic pole (32, 32', 32”), the other one (54, 54', 54”) deviates from a corresponding rotor magnetic pole (32, 32', 32”); auxiliary magnetic poles (56) close to the main magnetic poles which are odd number of said intervals away from the corresponding main magnetic poles (54, 54', 54”); and auxiliary magnetic poles (58, 58', 58”) far away from the main magnetic poles which pair up with the auxiliary magnetic poles (56) close to the main magnetic poles respectively.

Description

Stepper motor with stator paired auxiliary magnetic poles

The present invention relates to a stepper motor, and more particularly to a stepper motor having a stator paired with a pair of auxiliary poles. Background technique

Stepper motors are widely controlled in many fields because they can be programmed and precisely controlled, 'for example, business machines, precision machinery, instruments and components for motor vehicles, automatic opening and closing doors and windows or other automatic control, etc. Why, it shows more accurate and superior performance than traditional motors. The inner rotor stepping motor of U.S. Patent No. 6,043,574, the stator 10 of which has a plurality of "M" type cores 12, 14 in the center of the "M" cores 12, 14 The coils 122, 142 are sleeved on the columns 122, 142. When the coil assembly 144 is enabled, the central column 142 is close to the end of the permanent magnet rotor 16 to form, for example, an N magnetic pole, and the magnetic lines of force are passed through the core 14 of silicon steel. The magnetic shoes 146, 148 face opposite ends of the rotor 16 to attract or repel corresponding poles on the rotor 16 to drive the rotor 16 to pivot. The angles of the "M" cores 12, 14 are offset from the magnetic poles of the permanent magnet rotor 16, that is, when the core 14 is facing a magnetic pole of the rotor, the other core 12 is No|E pairs any of the poles of the rotor, but faces the buffer between the poles.

However, as shown in FIG. 2, since the stator actually has eight protrusions, each of the protrusions ^{45 is} taken, and the rotation has ten magnetic poles, and the magnetic pole pitch is 36 degrees. Therefore, the center pillar 142 and the magnetic shoes 146, 148 The spacing is actually slightly larger than the pole spacing of the rotor, which does not correspond exactly; that is, when the central column 142 of the "M" core 14 is aligned with the rotor pole, the magnetic shoes 146, 148 are respectively offset from the corresponding rotor pole by 9 degrees, The outer core 12 and the external stator yoke are respectively offset by 18 degrees (just between the two rotor poles) and 9 degrees. Since each stator yoke is not facing the rotor magnetic pole, the energy utilization efficiency is not only increased. Discounted, and the magnetic force that is directed will produce unnecessary lateral components. According to the above structure, when the magnetic force of the rotor magnetic pole reaches 900 Gauss and the driving current is 30 amps, the torque is 3.56 X 10' ⁶ mN-m.

In order to meet the above requirements, the creator of the present invention additionally applies the new patent No. 962012 of Taiwan, as shown in Fig. 3, which discloses a stepping motor having two auxiliary yoke portions, mainly comprising a turn 22 and a stator 2. In the novel creation, the rotor 22 is an 18-pole rotor, and the magnetic poles are radially disposed on the outer side of the rotor 22 along a pivot, so that each magnetic pole accounts for about 20 in the drawing and calculation process. ° (360 718=20 °).

The stator 2 of this example is provided with two main yoke portions 26, two auxiliary yoke portions 28, and a high magnetoresistive portion 24, and the relationship between the main yoke portion 26 and the auxiliary yoke portion 28 is the main yoke portion 26 and the rotor. The line of the pivot 20 and the auxiliary yoke portion 28

-1- Confirmation The main yoke portion 26 is different from the magnetic pole of the rotating yoke 22, and when the main yoke portion 26 corresponds to the N or S pole of the rotor 22, the other main yoke portion 26 is Corresponding to the buffer between the N and S poles of the rotor 22. According to the disclosure of the case, not only the main yoke portion and the auxiliary yoke portion of the same group will face the rotor magnetic pole at the same time, so that the magnetic energy utilization efficiency is higher; and at the auxiliary yoke portion, the main magnetic yoke portion is used to enable the magnetic pole escape. The scattered magnetic lines help to increase the efficiency of the magnetic energy; in particular, the auxiliary yoke and the main yoke are separated by an obtuse angle, which effectively reduces the polarization of the rotor and prolongs the life of the rotor pivot-related parts.

However, when the stepping motor volume is gradually miniaturized, the size of the rotor and the stator are reduced, and the arc length corresponding to each rotor pole is shortened, that is, when the main yoke portion is composed of the body and the magnetic shoe, the body and The distance between the magnetic shoes is also reduced. If you still want to maintain the original coil size, it will cause troubles in manufacturing, but reducing the number of turns will weaken the magnetic force. '

Therefore, without changing the size of the coil, the structure of the main yoke portion must be changed to allow the coil of the original size to be smoothly inserted into the body, and the auxiliary yoke portion is also slightly changed to provide a vibration damping effect. Extend product life. Summary of the invention

Accordingly, it is an object of the present invention to provide a stepping motor that expands the ratio of the main magnetic pole to the auxiliary magnetic yoke and the pitch, thereby allowing the overall 'volume to be more miniaturized. Another object of the present invention is to provide a stepping motor that reduces the eccentric vibration and makes the operation quieter by the induction of the auxiliary magnetic pole and the rotor magnetic pole.

Still another object of the present invention is to provide a stepping motor which can reduce vibration friction and improve energy utilization performance. It is still another object of the present invention to provide a stepping motor that reduces the unnecessary wear of the pivot-related components and extends the operational life.

The stator of the present invention has a stepping motor with a pair of auxiliary magnetic poles, comprising: a rotor for pivoting, having a plurality of magnetic poles disposed on the surface of the rotor in the radial direction of the pivot and opposite in magnetic relationship, each of the magnetic poles The poles are equally spaced; the stator is concentric with the rotor and spaced apart by an air gap, and includes: two sets of main magnetic poles respectively having a body, a set of coil sets disposed on the body, and when one of the two sets of main magnetic poles corresponds to a rotor magnetic pole, the other magnetic pole is offset from the corresponding rotor magnetic pole position '; and two sets of near main magnetic pole auxiliary magnetic poles respectively corresponding to the main magnetic pole and corresponding to the main magnetic clip with an odd rotor magnetic pole spacing; The remote main magnetic pole auxiliary magnetic poles are respectively arranged in pairs with the near main magnetic pole auxiliary magnetic poles and sandwiching the rotor pole pitch.

By the arrangement of the pair of auxiliary magnetic poles, not only the magnetic energy can be fully utilized, but also the pair of auxiliary magnetic poles can be combined with the rotor The magnetic poles are inductively attracted to each other, and the attraction force is multiplied and multiplied by the main magnetic poles, and the resultant force is offset, which can reduce energy consumption, improve rotor rotation efficiency, and increase rotor stability when not enabled; It reduces the attractiveness of the deflection, reduces the vibration energy consumption and the friction with the bearing part. The internal space configuration of the stator makes the installation of the coil set of the micro stepping motor smoother and fully achieves the purpose of the invention. DRAWINGS

Figure 1 is a top plan view of a preferred embodiment of a stepping motor of U.S. Patent No. 6,043,574;

Figure 2 is a schematic view showing the distribution of magnetic lines of the stepping motor of Figure 1;

Figure 3 is a top plan view of the stepping motor in Taiwan Application No. 96201295;

4 is a top plan view of a stepping motor according to a first preferred embodiment of the present invention, illustrating a relationship between a stator, each pole and a rotor; and FIG. 5 is a schematic view of a magnetic leakage magnetic line of the embodiment of FIG.

Figure 6 is a schematic view showing the resultant force of the magnetic force of the embodiment of Figure 4;

Figure 7 is a top plan view of a second preferred embodiment of the present invention; and

Figure 8 is a top plan view of a third preferred embodiment of the present invention. Reference mark:

2, 10, 5, 5, 5": stator;

122, 142: central column; '

124, 144, 52, 52, 52" : coil set;

146, 148: magnetic boots;

16, 22, 3, 3, 3": rotor;

12, 14: iron core;

20, 30: pivot;

24, 6, 6, and 6": high magnetic resistance section;

26: main yoke portion;

28: auxiliary yoke portion;

32, 32, , 3 ^! 2": rotor pole;

4, 4, 4" : air gap;

50, 50', 50": body; 54, 54', 54": main magnetic pole;

55, 57: magnetic lines;

56: near the main magnetic pole auxiliary magnetic pole;

58, 58 ', 58": far main magnetic pole auxiliary magnetic pole;

F1~F3: Force. detailed description

The technical contents, features, and effects of the present invention will be apparent from the following description of the preferred embodiments illustrated herein. Further, in the various embodiments, the same components will be denoted by the reference numerals.

As shown in FIG. 4, the stator disclosed in the present invention has a step of remotely paired auxiliary magnetic poles, and mainly includes a rotor 3 and a stator 5, which are separated by a gap 4 and are concentric. In the present embodiment, the rotor 3 is exemplified by a 12-pole rotor, and the magnetic poles are radially disposed on the outer side facing the rotor 3 at intervals, so in the figure, each magnetic pole accounts for about 30 ° (360 712). =30 °).

The stator of the present invention is formed by stacking ferromagnetic materials such as a plurality of sheets of silicon steel sheets. The stator of the present invention has two bodies 50, two pairs of auxiliary magnetic poles and a high magnetoresistive section 6, and the two bodies 50 are respectively sleeved with coil sets 52 to provide energizing energy, thereby forming two main magnetic poles 54, paired auxiliary magnetic poles. Then, due to the positional relationship with the main magnetic pole 54, there are a near main magnetic pole auxiliary magnetic pole 56 and a far main magnetic pole auxiliary magnetic pole 58, respectively, and the relationship between the main magnetic pole 54 and the far main magnetic pole auxiliary magnetic pole 58 is the line connecting the main magnetic pole 54 and the rotor pivot 30. And the far main magnetic pole auxiliary magnetic pole 58 and the rotor shaft 30 are connected with an obtuse angle; the two main magnetic poles 54 are not synchronized with respect to the rotor magnetic pole 32, for example, when one of the main magnetic poles 54 is opposite to the Ν or S pole of the rotor 3. The magnetic pole is offset from any buffer between the Ν and S poles of the rotor 3, or: S magnetic poles, when the two coil groups 52 are enabled in turn, the rotor 3 is smoothly rotated, and the high magnetic resistance section 6 is applied to the stator 5. Formed during production to form an air space that reduces magnetic energy dissipation.

As shown in FIG. 5, the magnetic lines of force generated by the enabling coil group 52, mainly distributed as indicated by the thick broken line-magnetic line 55, will produce a strong attraction to the magnetic pole of the rotor at the main magnetic pole 54, thereby causing a bias as shown in FIG. The attraction Flo, however, is provided with the pair of near main magnetic pole auxiliary magnetic poles 56 and the far main magnetic pole auxiliary magnetic poles 58 of the present invention, assisting in attracting the rotor magnetic poles 32, thereby inducing the distribution of the magnetic lines 57 as shown by the thin broken lines, and thus distributed Around the stator 5 and a pair of auxiliary magnetic pole circuits. The experiment was carried out under the same environmental conditions as in Fig. 2. At this time, the rotor magnetic pole was still 900 Gauss, and the current flowing through the coil was also 30 amps. The torque at this time was increased to 5.1 (T mN- m, obviously The structure of Figure 2 is improved by about 6. i

According to the structure of the present invention, the rotor is attracted by the original magnetic force F1; the rotor magnetic pole 32 facing the pair of auxiliary magnetic poles is also subjected to The resultant force of the near main magnetic pole auxiliary magnetic pole 56 and the far main magnetic pole auxiliary magnetic pole 58 is attracted by the suction force F2; the resultant force of the two attractive forces is F3; because "the main magnetic pole and the rotor pivot line and the "far main magnetic pole auxiliary magnetic pole and the rotor pivot joint" The angle Θ of the line is an obtuse angle, so that F2 will be in the opposite component of the offset with F1, and the resultant force F3 is thus smaller than the original F1. This means that the single-direction magnetic attraction of the rotor is reduced by the resultant force, the vibration and noise are reduced, the bearing wear is slowed down, and the motor life is increased.

On the other hand, since the torque caused by F1 is in the same direction as the torque caused by F2 (for example, both clockwise directions), the resultant torque is increased beyond the torque caused by the original F1, even if the energy is the same, the rotor The rotation is still more efficient.

In order to further verify the concept of the above embodiments, the creators of the present invention respectively analyze the two steps of the stepping motor without the auxiliary magnetic pole and the stepping motor with the pair of auxiliary magnetic poles of the present invention, respectively, and are energized and not energized. Obtain the three axes of X, Υ, and _;; The data shows that in the absence of auxiliary magnetic poles, even if the rotor magnetic pole is selected to be 1100 Gauss" and the current of the stator coil is maintained at '30 amps, the torque caused by F1 is still only 3. 93 X 10" ⁶ niN- m, compared with the combined torque caused by the structure of the present case, only 67% of the structure of the present case. That is, according to the present disclosure, the stepping motor with the auxiliary magnetic pole performs better than the conventional stepping motor or the auxiliary magnetic pole. The data obtained by the Z-axis also shows that the creation of the present invention has the advantage of more effectively maintaining the rotor position when the two are in an unpowered condition.

In addition, since the relative spacing between the main magnetic pole 54 and the far main magnetic pole auxiliary magnetic pole 58 is enlarged, the coil assembly 52 can be easily mounted on the body 50 in an automatic machine tool in the stepping motor manufacturing process, and is not miniaturized by the stator size. The interference makes the miniaturization of the stepping motor even further realized. I

The structure of the present invention _{; in} addition to the rotor having 12 magnetic poles as in the above embodiment, the concept can also be applied to a stepping motor of a multi-pole rotor, as shown in Fig. 7 of the second embodiment of the present invention, the stator 5' is disposed at The outer side of the rotor 3'' is separated by an air gap 4'. The stator 5' has two bodies 50, and a neodymium resistive section 6'. The body 50 is sleeved with a coil set 52'. The rotor 3' has twenty staggered magnetic poles. The rotor poles 32' corresponding to the two main magnetic poles 54' are different. When one main magnetic pole 54, corresponding to the rotor magnetic pole 32, the other main magnetic pole corresponds to the buffer of the rotor magnetic pole 32; the main magnetic pole 54' and the remote main The magnetic pole auxiliary pole 58' maintains an obtuse angle of the clip, thereby effectively utilizing the attractive force of the auxiliary magnetic pole induced by the rotor magnetic pole to reduce the resultant force of the eccentricity, thereby weakening the polarization rotation of the rotor.

Of course, as can be easily understood by those skilled in the art, the structure of the present invention is not limited to the inner rotor motor, and can be easily converted to the outer rotor motor, so that the stator 5" is disposed in the outer rotor 3" as shown in FIG. The two are spaced apart by an air gap of 4". The stator 5" has two bodies 50" and a high magnetoresistive section 6". The two coil sets 52" are respectively sleeved on the body 50" to provide energetic energy, and the outer rotor 3" has twelve Interlaced magnetic poles, the outer rotor poles 32" corresponding to the two main magnetic poles 54" are different, When one main magnetic pole 54" corresponds to the outer rotor magnetic pole 32", the other main magnetic pole corresponds to the outer rotor magnetic pole 32"buffer; the main magnetic pole 54" and the far main magnetic pole auxiliary magnetic pole 58" still maintain an obtuse angle, thereby effectively reducing Eccentric force, and the vibration and wear caused;

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention, All should remain within the scope of the invention patent.

Claims

Power requirement

A stepping motor having a stator paired with a pair of auxiliary magnetic poles, comprising:

a rotor for pivoting, having a plurality of magnetic poles radially disposed on the surface of the rotor along the pivot and adjacent to each other, wherein the magnetic poles are equally spaced;

a stator that is concentric with the rotor and spaced apart by an air gap, comprising - two sets of main bodies, and a set of main magnetic poles of a coil set provided on the body, and when one of the two sets of main magnetic poles corresponds to a rotor magnetic pole, The other main magnetic pole is offset from the corresponding rotor magnetic pole position;

Two sets of near main magnetic pole auxiliary magnetic poles respectively corresponding to the main magnetic pole and having an odd rotor pole spacing corresponding to the main magnetic pole clip; and

The two groups are respectively arranged in pairs with the near main magnetic pole auxiliary magnetic poles and sandwich the far main magnetic pole auxiliary magnetic poles corresponding to the rotor pole pitch.

2. The stepping motor according to claim 1, wherein the main magnetic pole is connected to the rotor pivot line, and the distal main magnetic pole auxiliary magnetic pole and the rotor pivotal line are clamped at an obtuse angle.

The stepping motor according to claim 1, wherein the stator is an annular body having a closed magnetic circuit.

4. The stepping motor according to claim 3, wherein the stator forms a high reluctance section between the two main magnetic poles.

5. The stepper motor of claim 1 wherein said stator is mirror symmetrical.

6. The stepping motor of claim 1 wherein said stator is a stator of iron material.

The stepping motor according to claim 6, wherein the ferromagnetic material stator is a plurality of stacked silicon steel sheets.