阅读说明：本技术 一种低功耗大承载力的永磁偏置式止推磁悬浮轴承 (Permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity ) 是由 牛凯 付江寒 石忠东 于 2019-02-21 设计创作，主要内容包括：本发明涉及非接触磁轴承领域,特别涉及一种低功耗大承载力的永磁偏置式止推磁悬浮轴承,由左定子组件、右定子组件、转子和止推板组成,与转子间隙配合的左定子组件和右定子组件沿转子轴向左右分布；止推板设置于左定子组件和右定子组件之间,并与转子固定安装；左定子组件和右定子组件内分别设置有沿轴向充磁的轴向永磁体和沿径向充磁的径向永磁体。本发明采用径向永磁体和轴向永磁体相结合的方式,大大减弱了永磁磁路和电磁磁路的藕合,并且承载力大,损耗低,力-电流曲线线性度好。(The invention relates to the field of non-contact magnetic bearings, in particular to a permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, which consists of a left stator component, a right stator component, a rotor and a thrust plate, wherein the left stator component and the right stator component which are in clearance fit with the rotor are distributed left and right along the axial direction of the rotor; the thrust plate is arranged between the left stator component and the right stator component and fixedly mounted with the rotor; an axial permanent magnet magnetized along the axial direction and a radial permanent magnet magnetized along the radial direction are respectively arranged in the left stator component and the right stator component. The invention adopts the mode of combining the radial permanent magnet and the axial permanent magnet, greatly weakens the coupling of the permanent magnet magnetic circuit and the electromagnetic magnetic circuit, and has large bearing capacity, low loss and good force-current curve linearity.)

1. A permanent magnet offset thrust magnetic suspension bearing with low power consumption and large bearing capacity comprises a left stator component, a right stator component, a rotor and a thrust plate, wherein the left stator component and the right stator component which are in clearance fit with the rotor are distributed left and right along the axial direction of the rotor; the thrust plate is arranged between the left stator component and the right stator component and fixedly mounted with the rotor; the permanent magnet.

2. The low-power consumption large-bearing capacity permanent magnet offset type thrust magnetic suspension bearing is characterized in that the left stator assembly and the right stator assembly are distributed in a left-right symmetrical mode relative to a neutral surface of the thrust plate, and working air gaps are respectively arranged among the left stator assembly, the right stator assembly and the thrust plate.

3. The low-power consumption large-bearing capacity permanent magnet offset thrust magnetic suspension bearing according to claim 2, characterized in that the left stator component and the right stator component are both composed of a stator base, a stator coil, a magnetism isolating sleeve, a magnetic conduction ring and epoxy resin, the stator base is in clearance fit with the rotor, and the magnetism isolating sleeve is sleeved outside the stator base; the stator base body is provided with an annular stator slot, the slot opening faces the thrust plate, two sides of the slot opening are of unequal-height structures, one lower side of the slot opening is provided with an axial permanent magnet, the other higher side of the slot opening is provided with a radial permanent magnet, a magnetic conduction ring is arranged between the axial permanent magnet and the radial permanent magnet, and the axial permanent magnet, the radial permanent magnet and the magnetic conduction ring jointly close the slot opening of the annular stator slot; the stator coil is arranged in the annular stator slot and is fixed in an insulating mode through epoxy resin.

4. The low-power consumption high-bearing capacity permanent magnet offset type thrust magnetic suspension bearing according to claim 3, wherein a leakage magnetic air gap is arranged between the stator base body and the magnetic conduction ring.

5. The low-power consumption large-bearing capacity permanent magnet offset thrust magnetic suspension bearing as claimed in claim 4, wherein the axial permanent magnet and the radial permanent magnet are unipolar annular permanent magnets, which can be either an integral magnetic ring or formed by splicing a plurality of arc permanent magnets.

6. The low-power consumption high-bearing-capacity permanent magnet offset thrust magnetic suspension bearing according to claim 5, wherein the polarities of the radial permanent magnets and the axial permanent magnets on the side in contact with the magnetic conductive ring are the same.

7. The low-power consumption high-bearing capacity permanent magnet offset type thrust magnetic suspension bearing according to any one of claims 1 to 6, characterized in that the magnetic paths of the permanent magnet magnetic fields in the left stator component and the right stator component can be both anticlockwise, clockwise and anticlockwise.

8. The low-power consumption large-bearing capacity permanent magnet offset thrust magnetic suspension bearing according to claim 1, wherein the thrust plate and the rotor can be of an integrated processing structure or a split mounting structure.

Technical Field

The invention relates to a non-contact magnetic bearing, in particular to a permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity.

Background

The active magnetic suspension bearing is used as a non-contact supporting technology, has the advantages of no friction, low power consumption, high peak rotating speed, high rigidity, large bearing capacity, no abrasion and long service life, and is more and more widely applied to the fields of spaceflight, national defense, industry and the like. The thrust magnetic suspension bearing is used for controlling the axial degree of freedom of machinery and is an indispensable component of a magnetic suspension system. At present, the thrust magnetic suspension bearings commonly used in industry are divided into a current offset type thrust magnetic suspension bearing and a permanent magnet offset type thrust magnetic suspension bearing, and because the permanent magnet offset type thrust magnetic suspension bearing generates bearing force by means of a magnetic field excited by a permanent magnet and adjusts the bearing force by means of a magnetic field generated by winding current, the bearing force can respond to dynamic changes of a rotor in real time, and compared with the current offset type thrust magnetic suspension bearing, the current offset type thrust magnetic suspension bearing has the advantage of low loss, and therefore the current offset type thrust magnetic suspension bearing is widely.

As shown in fig. 1, the paths of the permanent magnetic circuit and the electromagnetic circuit of the conventional permanent magnetic offset thrust magnetic suspension bearing are overlapped, so that the electromagnetic circuit and the permanent magnetic circuit are coupled with each other in the stator matrix, the saturation of the stator matrix is increased, and the peak bearing capacity is limited; and the linearity of the force-current curve of the bearing is also poor due to the saturation of the magnetic circuit. In addition, the electromagnetic circuit passes through the permanent magnet with the magnetic conductivity close to that of air, so that large excitation magnetomotive force loss is easily caused, and the loss of the coil is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a permanent magnet offset type thrust magnetic suspension bearing which is small in coupling degree, large in bearing capacity, low in loss and good in force-current curve linearity.

In order to solve the technical problems, the invention is realized by the following technical scheme: a permanent magnet offset thrust magnetic suspension bearing with low power consumption and large bearing capacity comprises a left stator component, a right stator component, a rotor and a thrust plate, wherein the left stator component and the right stator component which are in clearance fit with the rotor are distributed left and right along the axial direction of the rotor; the thrust plate is arranged between the left stator component and the right stator component and fixedly mounted with the rotor; the left stator assembly and the right stator assembly are internally provided with an axial permanent magnet magnetized along the axial direction and a radial permanent magnet magnetized along the radial direction respectively.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, the left stator assembly and the right stator assembly are distributed in a bilateral symmetry mode relative to a neutral plane of the thrust plate, and working air gaps are respectively arranged among the left stator assembly, the right stator assembly and the thrust plate.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, the left stator component and the right stator component are respectively composed of a stator base body, a stator coil, a magnetism isolating sleeve, a magnetic conduction ring and epoxy resin, the stator base body is in clearance fit with the rotor, and the magnetism isolating sleeve is sleeved outside the stator base body; the stator base body is provided with an annular stator slot, the slot opening faces the thrust plate, two sides of the slot opening are of unequal-height structures, one lower side of the slot opening is provided with an axial permanent magnet, the other higher side of the slot opening is provided with a radial permanent magnet, a magnetic conduction ring is arranged between the axial permanent magnet and the radial permanent magnet, and the axial permanent magnet, the radial permanent magnet and the magnetic conduction ring jointly close the slot opening of the annular stator slot; the stator coil is arranged in the annular stator slot and is fixed in an insulating mode through epoxy resin.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, a magnetic leakage air gap is arranged between the stator base body and the magnetic conduction ring.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, the axial permanent magnet and the radial permanent magnet are unipolar annular permanent magnets, and can be an integral magnetic ring or formed by splicing a plurality of arc permanent magnets.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, the polarities of the radial permanent magnet and the axial permanent magnet on the side contacted with the magnetic conduction ring are the same.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, the magnetic paths of the permanent magnet magnetic fields in the left stator component and the right stator component can be anticlockwise, clockwise or anticlockwise.

According to the permanent magnet offset type thrust magnetic suspension bearing with low power consumption and large bearing capacity, the thrust plate and the rotor can be of an integrated processing structure or a split type installation structure.

Compared with the prior art, the invention has the beneficial effects that: the invention adopts the mode of combining the axial permanent magnet and the radial permanent magnet, reduces the magnetic flux of the yoke part of the stator matrix, weakens the coupling of the bearing permanent magnet magnetic circuit and the electromagnetic magnetic circuit, and has small magnetic density saturation degree and high peak bearing capacity in the stator matrix when in heavy current; and along with the reduction of the saturation degree of magnetic density, the linearity of a force-current curve of the bearing is greatly improved. In addition, the electromagnetic magnetic circuit does not pass through a radial permanent magnet, but only passes through a magnetic leakage air gap with smaller magnetic resistance and an axial permanent magnet, so that the magnetomotive force loss of the coil is greatly reduced, and the excitation power consumption of the coil is low.

Drawings

Fig. 1 is a schematic structural diagram of a prior art solution.

Fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

FIG. 4 is a working principle diagram of the present invention with the same rotating direction of the left and right bearing permanent magnetic circuits.

FIG. 5 is a schematic diagram of the operation of the left and right bearings of the present invention when the magnetic circuits of the permanent magnet are rotated in opposite directions.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 2 and 3, the permanent magnet offset thrust magnetic suspension bearing with low power consumption and large bearing capacity of the invention is composed of a rotor 1, a thrust plate 2, a left stator assembly 3 and a right stator assembly 4, wherein the thrust plate 2 is fixed on the rotor 1, the left stator assembly 3 and the right stator assembly 4 which are in clearance fit with the rotor 1 are distributed on the left side and the right side of the thrust plate 2, and are distributed in bilateral symmetry relative to a neutral surface of the thrust plate 2. Working air gaps are respectively arranged between the left stator assembly 3, the right stator assembly 4 and the thrust plate 2. The left stator component 3 and the rotor 1 form a left bearing, and the right stator component 4 and the rotor 1 form a right bearing.

The left stator component 3 and the right stator component 4 are both composed of a stator matrix 31, a stator coil 32, a magnetism isolating sleeve 33 and a magnetic conduction ring 34, and the stator matrix 31 is in clearance fit with the rotor 1; in embodiment 1 shown in fig. 2, an inner side wall of the annular stator groove is higher than an outer side wall, an axial permanent magnet 35 magnetized along an axial direction is arranged at the outer side wall of the notch of the annular stator groove, a radial permanent magnet 36 magnetized along a radial direction is arranged at the inner side wall, a magnetic conduction ring 34 is arranged between the axial permanent magnet 35 and the radial permanent magnet 36, and the axial permanent magnet 35, the radial permanent magnet 36 and the magnetic conduction ring 34 jointly close the notch of the annular stator groove; the stator coil 32 is arranged in the annular stator slot and is fixed in an insulating way through epoxy resin; the magnetism isolating sleeve 33 is sleeved outside the stator base 31 and attached to the outer wall of the magnetic conductive ring 34. In embodiment 2 shown in fig. 3, the outer side wall of the annular stator slot is higher than the inner side wall, an axial permanent magnet 35 magnetized along the axial direction is arranged at the inner side wall, a radial permanent magnet 36 magnetized along the radial direction is arranged at the outer side wall, a magnetic conductive ring 34 is arranged between the axial permanent magnet 35 and the radial permanent magnet 36, the magnetic conductive ring is in clearance fit with the rotor 1, and the axial permanent magnet 35, the radial permanent magnet 36 and the magnetic conductive ring 34 together close the notch of the annular stator slot; the stator coil 32 is arranged in the annular stator slot and is fixed in an insulating way through epoxy resin; the flux barriers 33 are attached to the outside of the stator base 31. In both embodiment 1 and embodiment 2, a leakage air gap 37 is left between the stator base 31 and the magnetic conductive ring 34.

The invention adopts the bearing structures which are arranged in pairs at the left and the right, and can respectively control two directions of axial freedom; and a mode of combining the radial permanent magnet 36 and the axial permanent magnet 35 is adopted, the radial permanent magnet 36 and the axial permanent magnet 35 jointly provide a permanent magnetic field which is a main source of bearing capacity, wherein the radial permanent magnet 36 is a main magnetic field, and the axial permanent magnet 35 is used as an auxiliary to compensate the magnetic leakage of the radial permanent magnet 36. The stator coil 32 is of an annular structure, the axis of the stator coil is coaxial with the axis of the rotor 1, and the magnetic field generated by electrifying the stator coil 32 plays a role in adjusting and controls the axial state of the rotor 1 in real time.

As shown in fig. 4, when the permanent magnetic circuits of the left bearing and the right bearing are rotated in the same direction, the current directions of the stator coils in the left bearing and the right bearing are opposite, and the left bearing and the right bearing form a series magnetic circuit. The permanent magnetic circuit of the main magnetic field is divided into two, the magnetic circuit I is a main magnetic circuit, starts from the N pole of the radial permanent magnet of the left bearing, sequentially passes through the magnetic conduction ring of the left bearing, the working air gap between the left bearing and the thrust plate, the working air gap between the thrust plate and the right bearing, the magnetic conduction ring of the right bearing, the radial permanent magnet of the right bearing, the inner side wall of the stator matrix of the right bearing, the working air gap between the right bearing and the thrust plate, the working air gap between the left bearing and the thrust plate, and the inner side wall of the stator matrix of the left bearing, and finally returns to the S pole of the radial permanent magnet; the magnetic circuit II is an auxiliary magnetic circuit, starts from the N pole of the axial permanent magnet of the left bearing, and finally returns to the S pole of the axial permanent magnet of the left bearing to form a closed loop through the magnetic conduction ring of the left bearing, the working air gap between the left bearing and the thrust plate, the working air gap between the thrust plate and the right bearing, the magnetic conduction ring of the right bearing, the axial permanent magnet of the right bearing, the outer side wall-yoke-inner side wall of the stator matrix of the right bearing, the working air gap between the right bearing and the thrust plate, the working air gap between the left bearing and the thrust plate, the inner side wall-yoke-outer side wall of the stator. In addition, two leakage paths exist, namely a leakage path III and a leakage path IV, the leakage path III is a leakage path of the radial permanent magnet 36, and starts from the radial permanent magnet 36, and returns to the radial permanent magnet 36 after sequentially passing through the magnetic conductive ring 34, the magnetic isolation air gap 37 and the bypassing stator substrate 31 to form a closed loop, or returns to the radial permanent magnet 36 after sequentially bypassing the stator substrate 31, the magnetic conductive ring 34 and the magnetic isolation air gap 37 to form a closed loop; the leakage magnetic path IV is a leakage magnetic path of the axial permanent magnet 35, and starts from the axial permanent magnet 35, sequentially passes through the magnetic conductive ring 34, the magnetic isolation air gap 37, and the outer side wall of the stator base 31, and then returns to the axial permanent magnet 35 to form a closed loop, and the leakage magnetic path IV belongs to local leakage and has a small influence.

As shown in fig. 5, when the permanent magnetic circuits of the left bearing and the right bearing are rotated in opposite directions, the current directions of the stator coils in the left bearing and the right bearing are the same, and the left bearing and the right bearing form a parallel magnetic circuit. The permanent magnetic circuit of the main magnetic field is divided into two, the magnetic circuit I is a main magnetic circuit, starts from the N pole of the radial permanent magnet 36, sequentially passes through the magnetic conductive ring 34, the working air gap, the thrust plate 2 and the inner side wall of the stator matrix 31, and returns to the S pole of the radial permanent magnet 36 to form a closed loop; the magnetic circuit II is an auxiliary magnetic circuit, and the N pole of the axial permanent magnet 35 starts to sequentially pass through the magnetic conductive ring 34, the working air gap, the thrust plate, the working air gap, and the parallel stator matrix 31, and then returns to the S pole of the axial permanent magnet to form a closed loop. In addition, two leakage magnetic paths, namely a leakage magnetic path III and a leakage magnetic path IV exist, the leakage magnetic path III is a leakage magnetic path of the radial permanent magnet 36, and starts from the radial permanent magnet 36, and returns to the radial permanent magnet 36 after sequentially passing through the magnetic conductive ring 34, the magnetic isolation air gap 37 and the bypassing stator matrix 31 to form a closed loop; the leakage magnetic path IV is a leakage magnetic path of the axial permanent magnet 35, and starts from the axial permanent magnet 35, sequentially passes through the magnetic conductive ring 34, the magnetic isolation air gap 37, and the outer side wall of the stator base 31, and then returns to the axial permanent magnet 35 to form a closed loop, and the leakage magnetic path IV belongs to local leakage and has a small influence.

As shown in fig. 4 and 5, at the yoke of the stator base 31, the magnetic path of the axial permanent magnet 35 and the leakage magnetic path of the radial permanent magnet 36 have opposite polarities, so that the magnetic flux at the yoke is weakened, a sufficient space is reserved for the electromagnetic magnetic path V, the coupling between the permanent magnetic path and the electromagnetic magnetic path V is reduced, and the peak bearing capacity of the bearing is improved. The radial permanent magnet 36 provides a main bearing force, the electromagnetic magnetic circuit does not pass through the radial permanent magnet 36, the thickness of the auxiliary axial permanent magnet 35 is very thin, the electromagnetic magnetic circuit V only generates little magnetomotive force loss when passing, and a leakage magnetic air gap 37 exists beside the axial permanent magnet 35, so that the magnetic resistance is small, and the magnetomotive force drop is limited. Therefore, the loss of the stator coil 32 is low.

Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and those skilled in the art can make various modifications in accordance with the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.