CN108494220A - A kind of cylindrical linear motor - Google Patents

Abstract

The invention relates to a cylindrical linear motor, which comprises: a primary structure, a secondary structure, multiple sets of first salient pole structures, multiple permanent magnets, and multiple windings, the primary structure and the secondary The structures are all cylindrical, the primary structure is ringed on the outside of the secondary structure, the secondary structure is coaxially arranged with the primary structure, and a plurality of permanent magnets are installed on the primary structure On the inner wall; one end of the first salient pole structure is installed on the inner wall of the primary structure, and the plurality of permanent magnets and the windings are installed on the plurality of first salient pole structures. By placing both the permanent magnet and the winding on the stationary side of the primary structure, the secondary structure is simple and the cost is reduced. In addition, the secondary structure is placed in seawater, which will not cause corrosion to the permanent magnet winding, easy maintenance and high reliability. .

Description

A cylindrical linear motor

technical field

The invention relates to the technical field of direct drive wave power generation, in particular to a cylindrical linear motor.

Background technique

Linear motor is a transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism. In the prior art, the windings and permanent magnets of the linear motor are usually arranged on the primary or secondary of the linear motor respectively, not on the side of the motor at the same time; during the motion of the linear motor, the secondary will drive the permanent magnet and the winding For reciprocating motion, the secondary is usually made of magnetically conductive material. In the state of frequent reciprocating motion, the secondary will generate a large amount of heat, which will cause the permanent magnet to lose magnetism due to excessive temperature.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cylindrical linear motor for the deficiencies of the prior art.

The technical solution of the present invention to solve the above technical problems is as follows: a cylindrical linear motor, the cylindrical linear motor includes: a primary structure, a secondary structure, multiple sets of first salient pole structures, multiple permanent magnets and multiple windings, the Both the primary structure and the secondary structure are cylindrical, the primary structure is ringed outside the secondary structure, the secondary structure is coaxially arranged with the primary structure, and a plurality of the permanent magnets are installed on the inner wall of the primary structure; one end of the first salient pole structure is installed on the inner wall of the primary structure, and the plurality of permanent magnets and the windings are installed on the plurality of first salient pole structures. pole structure; the end of the first salient pole structure away from the primary structure is provided with a plurality of protruding teeth, a groove is formed between two adjacent protruding teeth, and the permanent magnet is inserted into the In the groove part, the winding is coiled on the side wall of the adjacent protruding tooth part, and the middle part of the winding is sheathed with two protruding teeth and one permanent magnet. Two protruding teeth, three grooves and a permanent magnet are arranged between them.

The beneficial effects of the invention are: by arranging the windings and the permanent magnets of the linear motor on the primary structure that remains stationary, it is possible to prevent the permanent magnets from demagnetization caused by excessive temperature caused by the secondary movement. Both the permanent magnet and the winding are placed on the stationary side of the primary structure, which makes the secondary structure simple and cost-effective. In addition, the secondary structure is placed in seawater, which will not corrode the permanent magnet winding, which is convenient for maintenance and high in reliability.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the primary structure includes: a plurality of single-phase primary components, which are connected in the axial direction through a non-magnetic material; the single-phase primary components are in the shape of a hollow ring, Multiple sets of the first salient pole structures are arranged on the inner wall of the single-phase primary component, and multiple sets of the first salient pole structures are arranged at equal intervals along the circumferential direction on the inner wall of the single-phase primary component.

The beneficial effect of adopting the above further scheme is: the primary structure is formed by splicing multiple single-phase primary components. On the one hand, the discharge force generated by the primary structure to the secondary structure is increased, and the dynamic performance of the linear motor is improved; It is necessary to adjust the length of the secondary structure to expand or reduce the stroke of the linear motor; on the other hand, the decoupling between each phase motor, the positioning force can be offset by the reason of the multi-phase motor, which is convenient for the maintenance and assembly of the primary structure.

Further, the plurality of permanent magnets are all magnetized along the axial direction.

The beneficial effect of adopting the above-mentioned further scheme is: by setting the magnetic field of the linear motor as a transverse magnetic field, the direction of the magnetic force line is perpendicular to the direction of motion, the electric load and the magnetic load are decoupled, and m units can be used in the axial direction to form a multi-phase motor, reducing the The edge force of the radial flux linear motor is obtained. The permanent magnet is placed on the primary structure, and the permanent magnet is axially magnetized, which improves the thrust density of the linear motor and reduces the quality of the secondary structure.

Further, the ratio of the width of the groove portion in the axial direction of the primary structure to the width of the convex tooth portion in the axial direction ranges from 0.8 to 1.2.

The beneficial effect of adopting the above further solution is: by setting the convex tooth part and the groove part with special parameters, the sinusoidal degree of the back EMF is improved, so that the decoupling between the motors of each phase can be offset by the reason of the multi-phase motor.

Further, the protruding teeth are formed by stacking a plurality of the second laminations in the axial direction; the plurality of the second laminations are all silicon steel sheets.

The beneficial effect of adopting the above further solution is that the manufacture and processing of the primary lamination structure is simplified, the installation of the primary structure is facilitated, and the production efficiency of the linear motor is improved.

Further, the end of the first salient pole structure away from the secondary structure is an integral structure.

The beneficial effect of adopting the above further solution is: by setting one end of the secondary structure as an integral structure, the permanent magnet does not directly penetrate the salient pole structure, and the motor has strong fault tolerance, high operation reliability and high force density.

Further, the secondary structure includes: a second salient pole structure, the second salient pole structure is formed by a plurality of third laminations and a plurality of fourth laminations spaced from each other in the axial direction and stacked alternately, Each of the third laminations and each of the fourth laminations are annular, each of the third laminations is symmetrically provided with a pair of flanges, and each of the fourth laminations Two pairs of symmetrical flanges are arranged on the peripheral side.

The beneficial effect of adopting the above further scheme is: the flanges are interlaced to form a raised structure of the secondary structure, which makes the manufacturing and processing of the secondary laminate structure simple, facilitates the installation of the secondary structure, improves the production efficiency of the linear motor, and ensures that the secondary structure runs High reliability, light secondary structure and good dynamic response can improve the power quality of the generator; compared with the linear motor in the prior art, the secondary structure does not have permanent magnets and windings, so that the present invention The cylindrical linear motor is light in weight, sensitive in control response, and convenient for fault-tolerant operation and control. The permanent magnet is placed on the primary structure, and the permanent magnet is axially magnetized, which improves the thrust density of the linear motor and reduces the quality of the secondary structure.

Further, the secondary structure includes: a third salient pole structure, the third salient pole structure is formed by a plurality of fifth laminations and a plurality of sixth laminations spaced apart from each other in the axial direction and stacked alternately, Each of the fifth laminations and each of the sixth laminations is circular, and three pairs of symmetrical flanges are provided on the peripheral side of each of the fifth laminations.

The beneficial effect of adopting the above further solution is: as an alternative to the above third and fourth laminations, a salient pole structure of the secondary structure is formed by stacking a plurality of fifth and sixth laminations.

Further, the ratio range of the pole pitch of the secondary structure to the pole pitch of the primary structure is 0.9-1.8, and the ratio range of the secondary tooth width to the secondary pole pitch is 0.3-0.7.

The beneficial effect of adopting the above-mentioned further scheme is: by setting the parameters of the pole distance of the secondary structure and the pole distance of the primary structure, the back EMF sine degree of the linear motor is high, the decoupling between the motors of each phase, and the positioning force can be passed through the multi-phase motor The reasons are offset.

Further, the permanent magnet is made of NdFeB material.

The beneficial effect of adopting the above further solution is: the reliability of the permanent magnet is improved.

Description of drawings

Fig. 1 is one of the schematic structural block diagrams of the linear motor provided by the embodiment of the present invention;

Fig. 2 is the second schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 3 is the third schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 4 is the fourth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 5 is the fifth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 6 is the sixth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 7 is the seventh schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 8 is the eighth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 9 is the ninth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 10 is the tenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 11 is the eleventh schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 12 is the twelveth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 13 is the thirteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 14 is the fourteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 15 is the fifteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 16 is the sixteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention;

Fig. 17 is the seventeenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention.

Explanation of reference numbers:

1-primary structure; 11-first salient pole structure; 111-convex teeth; 112-groove; 12-permanent magnet; 13-winding; 14-single-phase primary component; 2-secondary structure; 21-second salient pole structure; 22-third lamination; 23-fourth lamination; 3-third salient pole structure; 31-fifth salient pole structure; 32- The sixth stack.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

It should be noted that the cylindrical linear motor of the embodiment of the present invention can be applied in the technical field of direct drive wave power generation, but not limited to, as a generator for direct drive wave power generation. Of course, those skilled in the art should be able to easily imagine that this The invented cylindrical linear motor can also be used as a motor in other fields.

As shown in Figures 1 to 17, Figure 1 is one of the schematic structural block diagrams of the linear motor provided by the embodiment of the present invention; Figure 2 is the second schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 3 is The third schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 4 is the fourth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 5 is the schematic structure of the linear motor provided by the embodiment of the present invention The fifth block diagram; Fig. 6 is the sixth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Fig. 7 is the seventh schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Fig. 8 is provided by the embodiment of the present invention The eighth schematic structural block diagram of the linear motor; Figure 9 is the ninth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 10 is the tenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; 11 is the eleventh schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 12 is the twelveth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 13 is the linear motor provided by the embodiment of the present invention Figure 14 is the fourteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; Figure 15 is the fifteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; 16 is the sixteenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention; FIG. 17 is the seventeenth schematic structural block diagram of the linear motor provided by the embodiment of the present invention.

Example 1

As shown in Figure 2, the present invention provides a cylindrical linear motor, which includes: a primary structure 1, a secondary structure 2, multiple sets of first salient pole structures 11, multiple permanent magnets 12 and multiple The winding 13, the primary structure 1 and the secondary structure 2 are all cylindrical, the primary structure 1 is surrounded by the outer side of the secondary structure 2, the secondary structure 2 and the primary structure 1 Coaxial arrangement, multiple permanent magnets 12 and multiple windings 13 are installed on the inner wall of the primary structure 1; one end of the first salient pole structure 11 is installed on the inner wall of the primary structure 1 A plurality of the permanent magnets 12 and the windings 13 are installed on a plurality of the first salient pole structures 11; the end of the first salient pole structure 11 away from the primary structure is provided with a plurality of convex teeth 111, a groove portion 112 is formed between two adjacent convex tooth portions, the convex tooth portion 111 and the groove portion 112 are spaced apart from each other, and the permanent magnet 12 is inserted into the groove portion 112 Among them, two protruding teeth 111 and one groove 112 are arranged between two adjacent permanent magnets 12; and both ends of the first salient pole structure 11 are protruding teeth 111, the The winding 13 is coiled on the side wall of the adjacent convex tooth portion 111, and the middle part of the winding 13 is provided with two convex tooth portions 111 and one permanent magnet 12, and the two adjacent windings 13 are arranged between There are two convex tooth portions 111 , three groove portions 112 and one permanent magnet 12 .

Among them, the present invention preferably selects three single-phase primary components, and preferably selects eighteen first salient pole structures 11, and each group of six of eighteen first salient pole structures 11 is respectively installed in three single-phase On the primary part; 54 permanent magnets 12 are preferably selected.

In practical applications, it is not limited to setting six first salient pole structures 11 on the inner wall of each single-phase primary component, and the number of first salient pole structures 11 can be a multiple of 6, for example, the number of first salient pole structures 11 It can be 6, 12 or 18, etc. Ability to counteract normal forces that interfere with secondary motion.

In the above structure, the linear motor can be composed of the primary pole structure 1 and the secondary pole structure 2 . Wherein, the primary pole structure 1 and the secondary pole structure 2 have the same circle center. During practical application, the primary pole structure 1 remains stationary, and only the secondary pole structure 2 reciprocates along the axial direction. The iron cores of the primary pole structure 1 and the secondary pole structure 2 are both formed by stacking silicon steel sheets in the axial direction.

In the above structure, the first salient pole structure 11 can be the iron core of the linear motor, the protruding tooth portion 111 can be the tooth of the linear motor iron core, and the groove portion 112 can be the slot of the linear motor iron core. The primary pole structure 1 and the secondary pole structure 2 of the linear motor are not in complete contact, and there is an air gap between them. The salient poles of the primary pole structure 1 and the salient poles of the secondary pole structure 2 in each part have the same distance, and the thickness of the air gap is also the same. . Specifically, the primary structure 1 is a hollow cavity, and two independent bearing supports can be respectively arranged at both ends of the secondary structure 2, and the bearing supports suspend the secondary structure in the hollow cavity of the primary structure 1, using It is used to prevent the linear motor from generating resistance and heating due to friction during the movement, so that the linear motor can work normally.

FIG. 9 is a salient pole structure of the initial pole, which is composed of a convex tooth portion 111 , a permanent magnet 12 and a groove portion 112 . Each set of first salient pole structures 11 is provided with grooves 112 , and there are five grooves 112 in total. Each of the three permanent magnets 12 has a groove portion 112 placed in the groove. The permanent magnet 12 is made of NdFeB material. In order to make the magnetic density in the air gap close to a sine wave, the magnetization directions of the three permanent magnets 12 are not exactly the same. , but they are all magnetized along the axial direction. The schematic diagram of the magnetization direction of the permanent magnet 12 is shown in FIG. 10 . Windings 13 are placed in slots without permanent magnets 12, and the current direction of the windings wound on the salient poles along the axial direction of each column is the same, but the current direction of the upper winding is opposite to that of the middle and lower windings, and the specific current flow direction is shown in Figure 11 .

As shown in Figure 11, the arrows in the figure represent the flow direction of the current in the winding; the winding of the first salient pole structure 11 in the upper part in Figure 5 corresponds to UPPER (high) 1 and UPPER2 in Figure 11, and the first salient pole structure 11 in the middle of Figure 5 The winding of a salient pole structure 11 corresponds to M I DDLE (middle) 1 and M I DDLE2 in FIG. 11 , and the winding of the first salient pole structure 11 in the lower part of FIG. 5 corresponds to LOWER (low) 1 and LOWER2 in FIG. Wherein, the current flow directions of the windings UPPER (high) 1 and UPPER2 of the first salient pole structure 11 in the upper part are consistent, and the current flow directions of the windings MI DDLE (middle) 1 and MI DDLE2 of the first salient pole structure 11 in the middle are consistent, The current flow directions of LOWER (low) 1 and LOWER2 of the winding of the first salient pole structure 11 in the lower part are consistent; The current flow directions of LOWER (low) 1 and LOWER2 of the winding of the first salient pole structure 11 are the same; The current flow directions of the windings MI DDLE (middle) 1 and MI DDLE2 of the structure 11 and the current flow directions of the windings of the lower first salient pole structure 11 of LOWER (low) 1 and LOWER2 are opposite.

By arranging the winding 13 and the permanent magnet 12 of the linear motor on the primary structure 1 that remains stationary, the phenomenon of loss of magnetism of the permanent magnet caused by excessive temperature caused by the secondary movement is prevented. Both the permanent magnet and the winding are placed on the stationary side of the primary structure, which makes the secondary structure simple and cost-effective. In addition, the secondary structure is placed in seawater, which will not corrode the permanent magnet winding, which is convenient for maintenance and high in reliability. Ability to counteract normal forces that interfere with secondary motion.

Example 2

As shown in Figure 2 and Figure 8, on the basis of Embodiment 1, the primary structure of this embodiment includes: a plurality of single-phase primary components 14, and a plurality of single-phase primary components 14 are passed through non-magnetic The materials are connected in the axial direction; the non-magnetically conductive material acts as a magnetic insulation and a fixed connection for the individual single-phase primary parts. The single-phase primary component 14 is in the shape of a hollow ring, and multiple sets of the first salient pole structures 11 are arranged on the inner wall of the single-phase primary component 14, and multiple sets of the first salient pole structures 11 are arranged on the single-phase primary component 14. The inner walls of the phase primary parts 14 are arranged at equal intervals in the circumferential direction.

In the process of actual production and application, the number of phases of the motor can be changed according to the demand, and at the same time, the motors of each phase are connected by non-magnetic materials. The non-magnetic body can be m-1.

The schematic cross-sectional view of the single-phase symmetrical structure of the motor is shown in Figure 4, and the cross-sectional view of the initial pole of the motor is shown in Figure 5. It can be seen from the figure that the main body of the single-phase initial pole part of the motor is a hollow cylindrical silicon steel block. In the process, the single-phase primary part is usually formed by stacking multiple hollow circular plate structures. It should be noted that the multiple hollow circular plate structures can be silicon steel sheets, so that the single-phase primary part Can be magnetically permeable to provide a flux path for linear motors. The inner wall of the cylinder is six groups of first salient pole structures 11 . The cross-section shown in the figure shows three groups of first salient pole structures 11 , and the other three groups are symmetrical to them according to the cross-section plane. And the primary pole structure is formed by laminating two kinds of silicon steel sheets as shown in Fig. 6 and Fig. 7 . Three groups of primary pole modules are connected sequentially through non-magnetic materials to form a three-phase structure of a cylindrical linear motor. The schematic diagram of the three-phase structure is shown in Figure 8.

By arranging the winding 13 of the linear motor and the permanent magnet 12 on the primary structure 1 that remains stationary, the phenomenon of demagnetization of the permanent magnet 12 caused by excessive temperature caused by the movement of the secondary structure 2 is prevented. Both the permanent magnet and the winding are placed on the stationary side of the primary structure, which makes the secondary structure simple and cost-effective. In addition, the secondary structure is placed in seawater, which will not corrode the permanent magnet winding, which is convenient for maintenance and high in reliability.

Compared with the traditional transverse magnetic flux linear motor, the permanent magnet 12 of the present invention is placed on the side of the primary structure 1 and magnetized in the axial direction, which improves the thrust density of the motor, reduces the quality of the secondary structure 2, and can be processed and manufactured Simple. Compared with the traditional cylindrical linear motor, the magnetic field of the present invention is a transverse magnetic field, the direction of the magnetic force line is perpendicular to the direction of motion, the electric load and the magnetic load are decoupled, and m units can be formed in the axial direction to form a multi-phase motor, which is convenient for fault-tolerant operation and control.

The primary structure 1 is formed by splicing multiple single-phase primary components 14. On the one hand, the discharge force generated by the primary structure to the secondary structure is increased, and the dynamic performance of the linear motor is improved; the linear motor can adjust the secondary structure 1 according to actual needs. Length, so as to expand or reduce the stroke of the linear motor; on the other hand, the decoupling between each phase motor, the positioning force can be offset by the reason of the multi-phase motor, which is convenient for the maintenance and assembly of the primary structure 1.

Example 3

As shown in FIG. 10 , on the basis of Embodiment 1, the plurality of permanent magnets 12 in this embodiment are all magnetized along the axial direction.

In order to make the magnetic density in the air gap close to a sine wave, the magnetization directions of the three permanent magnets 12 are not exactly the same, but they are all magnetized along the axial direction. The left side of the permanent magnet 12 on the side can be N-level, the right side of the leftmost permanent magnet 12 in the figure can be S-level, the left side of the permanent magnet 12 in the middle of the figure can be S-level, and the permanent magnet 12 in the middle of the figure can be S-level. The right side of the magnet 12 can be N level, the left side of the rightmost permanent magnet 12 in the figure can be N level, and the right side of the rightmost permanent magnet 12 in the figure can be S level.

By setting the magnetic field of the linear motor as a transverse magnetic field, so that the direction of the magnetic force line is perpendicular to the direction of motion, the electric load and the magnetic load are decoupled, and m units can be used in the axial direction to form a multi-phase motor. Preferably, the value of m is 6 Multiples, such a structural design can offset the normal force that interferes with the movement of the secondary structure 2, reducing the edge force of the radial flux linear motor. Wherein, m is a numerical value, and the numerical value of m may be determined according to actual needs. The permanent magnet 12 is placed on the primary structure 1 , and the permanent magnet is axially magnetized, which improves the thrust density of the linear motor and reduces the quality of the secondary structure 2 .

Example 4

On the basis of Embodiment 1, the ratio of the width of the groove part 112 in the axial direction of the primary structure to the width of the convex tooth part 111 in the axial direction of this embodiment is in the range of: 0.8-1.2 .

Wherein, the width of the protruding tooth portion 111 may be 4 millimeters.

By setting the convex tooth portion 111 and the groove portion 112 with special parameters, the sinusoidal degree of the back EMF is improved, so that the motors of each phase are decoupled, and the positioning force can be offset by the reason of the multi-phase motor.

Example 5

As shown in Figure 6 and Figure 7, on the basis of Embodiment 1, the convex tooth part 111 of this embodiment is formed by stacking a plurality of the first laminations 15 in the axial direction; The groove portion 112 is formed by stacking a plurality of the second laminations 16 in the axial direction; the plurality of the first laminations 15 and the plurality of the second laminations 16 are all silicon steel sheets.

In the above structure, the first laminated sheet 15 and the second laminated sheet 16 are arc-shaped sheet structures, and the height of the second laminated sheet 16 is smaller than that of the first laminated sheet 15 .

Through the setting of the above structure, the manufacturing and processing of the primary lamination structure is simple, and the installation of the primary structure is convenient, and the thickness of the protruding teeth can be adjusted by increasing or decreasing the number of laminations according to actual needs, so as to improve the production efficiency of the linear motor.

Example 6

As shown in FIG. 9 , on the basis of any one of embodiment 1 to embodiment 5, the end of the first salient pole structure 11 in this embodiment away from the secondary structure 2 is an integrated structure.

By setting one end of the secondary structure 2 as an integral structure, the permanent magnet 12 does not directly penetrate the first salient pole structure 11 , so that the motor has strong fault tolerance, high operational reliability and high force density. In addition, by setting one end of the secondary structure 2 as an integrated structure, the permanent magnet 12 can be stably fixed in the first salient pole structure 11 , thereby improving the stability of the permanent magnet 12 .

Example 7

As shown in Figure 13 and Figure 14, on the basis of any one of Embodiment 1 to Embodiment 5, the secondary structure of this embodiment includes: a second salient pole structure 21, the second salient pole structure 21 is formed by stacking a plurality of third laminations 22 and a plurality of fourth laminations 23 in the axial direction, each of the third laminations 22 and each of the fourth laminations 23 is a ring Each of the third laminations 22 is symmetrically provided with a pair of flanges, and each of the fourth laminations 23 is provided with two pairs of symmetrical flanges.

The stacking method for the above laminations can be as follows: ten third laminations are stacked sequentially and connected as the first group of laminations, ten fourth laminations are sequentially stacked and connected as the second group of laminations, and ten third laminations Stacked and connected in turn as the third set of laminations, viewed in the axial direction of the first set of laminations, the flanges in the first set of laminations overlap each other; viewed in the axial direction of the second set of laminations , the flanges in the second group of laminations coincide with each other; viewed from the axial direction of the third group of laminations, the flanges in the third group of laminations overlap each other; the first group of laminations, the second group of laminations The sheets and the third group of laminations are superimposed and connected in sequence, and the flanges of the first group of laminations and the flanges of the second group of laminations are arranged alternately, and the flanges of the second group of laminations and the flanges of the third group of laminations Interlaced with each other, viewed in the axial direction, the peripheral side of the combination formed by the first group of laminations and the second group of laminations has six flanges arranged at equal intervals, the second group of laminations and the third group of laminations The peripheral side of the resulting combination has six equally spaced flanges.

Wherein, the number of the second salient pole structures 21 may be the same as the number of the first salient pole structures 11 . The second salient pole structure 210 is formed by stacking laminations. There is neither permanent magnet nor armature winding on the secondary pole structure 2. The secondary pole structure is in the shape of a hollow cylinder. Corresponding to 11, the secondary structure 2 is provided with six sets of secondary pole teeth, and the secondary pole structure 2 is only composed of simple teeth and yokes. The secondary pole pitch can be set as 0.9-1.8 times of the primary pole pitch, and the secondary tooth width is 0.3-0.7 times of the secondary pole pitch according to different application scenarios.

It should be noted that, viewed from both ends of the secondary structure 2 along the axial direction of the secondary structure 2, the number of secondary teeth in the circumferential direction of the secondary structure 2 may be a multiple of 6, for example, 6 Secondary teeth or 18 secondary teeth. Ability to counteract normal forces that interfere with secondary motion. Correspondingly, the number of first salient pole structures 11 in the circumferential direction of the single-phase primary part 14 is the same as the number of secondary teeth. That is, when the two ends of the secondary structure 2 are viewed along the axial direction of the secondary structure 2, when the number of the secondary teeth in the circumferential direction of the secondary structure 2 is 6, correspondingly, the circumference of the single-phase primary component 14 The number of first salient pole structures 11 in the direction may be six.

The above-mentioned flanges are interlaced to form a raised structure of the secondary structure, which makes the manufacturing and processing of the secondary lamination structure simple, facilitates the installation of the secondary structure 2, and improves the production efficiency of the linear motor. The secondary structure 2 has high operational reliability and the secondary The structure 2 has light weight and good dynamic response, which can improve the power quality of the generator; compared with the linear motor in the prior art, the secondary structure 2 does not have permanent magnets 12 and windings 13, so that the cylinder of the present invention The linear motor is light in weight, and the control response is sensitive, which is convenient for fault-tolerant operation and control. The permanent magnet 12 is placed on the primary structure 2 , and the permanent magnet 12 is axially magnetized, which improves the thrust density of the linear motor and reduces the quality of the secondary structure 2 .

Example 8

As shown in FIG. 15 and FIG. 16 , on the basis of any one of Embodiment 1 to Embodiment 5, this embodiment serves as an alternative to Embodiment 7.

The secondary structure 2 may also include: a third salient pole structure 3, the third salient pole structure 3 is formed by stacking a plurality of fifth laminations 31 and a plurality of sixth laminations 32 in the axial direction Each of the fifth laminations 31 and each of the sixth laminations 32 is circular, and each of the fifth laminations 31 is provided with three pairs of symmetrical flanges on the peripheral side.

As an alternative to the above-mentioned third laminations 22 and fourth laminations 23 , the second salient pole structure 21 of the secondary structure 2 is formed by stacking a plurality of fifth laminations 31 and a plurality of sixth laminations 32 .

Example 9

On the basis of any one of Embodiment 1 to Embodiment 5, the ratio of the pole pitch of the secondary structure to the pole pitch of the primary structure in this embodiment ranges from 0.9 to 1.8, and the ratio of the secondary tooth width to The ratio range of the secondary pole distance is: 0.3-0.7.

By setting the parameters of the 2-pole pitch of the secondary structure and the 2-pole pitch of the primary structure, the back EMF of the linear motor has a high sinusoidal degree, decoupling between each phase motor, and the positioning force can be offset by the reason of the multi-phase motor.

Example 10

On the basis of any one of embodiment 1 to embodiment 5, the permanent magnet 12 of this embodiment is made of NdFeB material. Improve the reliability of permanent magnets.

Example 11

On the basis of any one of Embodiment 1 to Embodiment 10, this embodiment describes in detail the magnetic circuit of the cylindrical linear motor of the present invention.

Figure 17 is a schematic diagram of the magnetic circuit in a single-phase section of the motor, taking this schematic diagram as an example, and the other phases and symmetrical parts are the same as the structure shown in this figure. The dotted lines in the figure represent the paths of the magnetic flux. The magnetic circuit starts from the upper and lower permanent magnets 12 of the initial pole, and because the permanent magnets 12 are magnetized in parallel and the polarities of the adjacent permanent magnets 12 are opposite, the magnetic flux generated by the N poles of the upper two adjacent permanent magnets 12 passes through The two initial pole teeth between the two permanent magnets gather downward, and at the same time, the magnetic flux generated by the N pole of the lower permanent magnet 12 gathers upward through the two initial pole teeth between two adjacent permanent magnets 12 . At this time, because the upper and lower magnetic fluxes are equal in magnitude and opposite in direction, the direction of the magnetic flux is forced to change. After passing through the upper and lower air gaps, it passes through the secondary pole teeth and secondary pole yoke, then passes through the middle air gap, and passes through the middle primary pole. The teeth enter the S pole of the middle permanent magnet, then enter the initial pole core from the N pole of the middle permanent magnet 12, and finally converge to the S poles of the upper and lower permanent magnets 12 that start to emit magnetic force lines, thus forming the main magnetic flux circuit of the motor . The permanent magnet 12 of the motor is placed on the static primary pole iron core, which effectively avoids the phenomenon of demagnetization of the permanent magnet 12 caused by the excessive temperature of the secondary structure 2 caused by the movement of the secondary pole structure 2 . Both the permanent magnet and the winding are placed on the stationary side of the primary structure, so that the secondary structure is simple and the cost is reduced. In addition, the secondary structure is placed in seawater, which will not cause corrosion to the permanent magnet winding, which is convenient for maintenance and high in reliability. Ability to counteract normal forces that interfere with secondary motion.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. a kind of cylindrical linear motor, which is characterized in that the cylindrical linear motor includes：Primary structure (1), secondary structure (2), Multigroup first salient-pole structure (11), multiple permanent magnets (12) and multiple windings (13), the primary structure (1) and described time Level structure (2) is cylindrical shape, and primary structure (1) ring set is in the outside of the secondary structure 2, the secondary structure (2) It is coaxially disposed with the primary structure (1),

One end of first salient-pole structure (11) is mounted on the inner wall of the primary structure (1), multiple permanent magnets (12) and the winding (13) is installed on multiple first salient-pole structures (11)；

The one end of first salient-pole structure (11) far from the primary structure is provided with multiple convex teeth portions (111), two neighboring Formed between convex teeth portion there are one concave part (112), the permanent magnet (12) is plugged in the concave part (112), it is described around Group (13) is coiled on the side wall of adjacent tooth portion (111), be arranged in the middle part of the winding (13) there are two convex teeth portion (111) with And a permanent magnet (12), there are two convex teeth portion (111), three grooves for setting between adjacent two windings (13) Portion (112) and a permanent magnet (12).

2. cylindrical linear motor according to claim 1, which is characterized in that the primary structure (1) includes：It is multiple single-phase Primary components (14) are connected by un-conducted magnetic material in the axial direction between multiple single-phase primary components (14)；

The single-phase primary components (14) are that open circles are cyclic annular, are provided on the internal ring wall of the single-phase primary components (14) multigroup First salient-pole structure (11), multigroup first salient-pole structure (11) single-phase primary components (14) inner wall circumferentially Spaced set on direction.

3. cylindrical linear motor according to claim 1, which is characterized in that multiple permanent magnets (12) are filled in an axial direction Magnetic.

4. cylindrical linear motor according to claim 1, which is characterized in that the concave part (112) is in the primary knot The ratio range of width of the width with the convex teeth portion (111) in the axial direction in structure axial direction is：0.8-1.2.

5. cylindrical linear motor according to claim 1, which is characterized in that the convex teeth portion (111) is folded by multiple second Piece (16) is overlapped mutually in the axial direction；Multiple second laminations (16) are silicon steel sheet.

6. according to any cylindrical linear motors of claim 1-5, which is characterized in that first salient-pole structure (11) is remote One end from the secondary structure (2) is an integral structure.

7. according to any cylindrical linear motors of claim 1-5, which is characterized in that the secondary structure (2) includes：The Two salient-pole structures (21), second salient-pole structure (21) is by multiple third laminations (22) and multiple 4th laminations (23) in axis To on direction it is spaced and staggeredly be formed by stacking,

Each third lamination (22) and each 4th lamination (23) are circular ring shape, each third lamination (22) side is symmetrically arranged with a pair of flanges, the side of each 4th lamination (23) be provided with two-by-two symmetrical two pairs it is convex Edge.

8. according to any cylindrical linear motors of claim 1-5, which is characterized in that the secondary structure (2) includes：The Three salient-pole structures (3), the third salient-pole structure (3) is by multiple 5th laminations (31) and multiple 6th laminations (32) in axial direction On direction it is spaced and staggeredly be formed by stacking,

Each 5th lamination (31) and each 6th lamination (32) are circular ring shape, each 5th lamination (31) side is provided with symmetrical three pairs of flanges two-by-two.

9. according to any cylindrical linear motors of claim 1-5, which is characterized in that secondary structure (2) pole span with The ratio range of primary structure (1) pole span is：0.9-1.8, the ratio range of the secondary facewidth and the secondary pole span For：0.3-0.7.

10. according to any cylindrical linear motors of claim 1-5, which is characterized in that the permanent magnet (12) is by neodymium iron Boron material is made.