Linear motor

Abstract

To provide a linear motor in which heat generated from a coil of an armature module is dissipated.SOLUTION: A linear motor includes: a primary member including a plurality of armature modules 10; and a secondary member including a permanent magnet module including a plurality of permanent magnets arranged in a first direction Z in which the plurality of armature modules 10 are arranged while the polarities are changed. Either one of the primary member and the secondary member serves as a mover while the other serves as a stator, and mutually relative movement in the first direction Z is performed. Each of the armature modules 10 has: a connection portion 11; a magnetic body core including two or more salient poles 12 projecting from the connection portion 11; and a coil 13 wound around the magnetic body core and connected so as to allow current of the same phase to flow. The permanent magnet module is placed between two salient poles 12 of the armature module 10, and a distance between two adjacent armature modules 10 is greater than a distance between two adjacent salient poles 12 of the same armature module 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present specification relates to a linear motor. [Background technology]

[0002] Generally, a linear motor is structured to generate thrust between a mover and a stator that are arranged in a straight line. A permanent magnet type linear motor places a permanent magnet on either the mover or the stator, sends alternating polyphase power to the remaining one, and generates thrust in a fixed direction by the action of electromagnetic force between the two.

[0003] Conventionally, most linear motors have a structure in which magnetic flux emitted from the salient poles of an electromagnetic core passes through a permanent magnet and a yoke to form a closed magnetic circuit, generating attractive and repulsive forces to generate thrust. Therefore, in most cases, the permanent magnets are placed between the salient poles and the yoke and attached to the yoke.

[0004] The inventors of the embodiments of the present specification have filed a Korean patent application No. KR10-2010-0081522 (corresponding to Patent Document 1) for a linear motor with a new structure having a primary member composed of a plurality of armature modules arranged in a row in the direction of travel, and a secondary member including one or more (or a plurality of) permanent magnet modules including a plurality of permanent magnets arranged with changing poles in the direction of travel.

[0005] Supplying more power to the electric motor to increase thrust and speed increases the operating speed, which causes more heat to be generated in the armature module. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above circumstances, an object of the present specification is to provide a linear motor capable of dissipating heat generated from the coils of the armature module. [Means for solving the problem]

[0007] A linear motor according to an embodiment of the present specification includes a primary member including a plurality of armature modules, and a secondary member having a permanent magnet module including a plurality of permanent magnets arranged with poles changing in a first direction in which the plurality of armature modules are arranged, and either one of the primary member or the secondary member serves as a mover and the other serves as a stator, and they move relatively to each other in the first direction. Each of the armature modules has a connection portion, a magnetic core including two or more salient poles protruding from the connection portion, and coils wound around the magnetic core and connected so that currents of the same phase flow therethrough, the permanent magnet module is placed between the two salient poles of the armature module, and a distance between the two adjacent armature modules is larger than a distance between the two adjacent salient poles in the same armature module. Effect of the Invention

[0008] By adopting a structure that allows air to flow smoothly between the armature modules, heat generated when the linear motor is operated at high thrust and high speed can be effectively dissipated.

[0009] Furthermore, if the heat generated from the coils of the armature module is discharged to the outside via a fan or a coolant conduit, the operating temperature of the armature module can be lowered. [Brief description of the drawings]

[0010] [Figure 1] 1 illustrates an open-type linear motor described in Korean Patent Application No. KR10-2010-0081522 filed by the inventor of the present specification. [Diagram 2] The figure shows a linear motor with nine armature modules distributed amongst each other, which make up the primary member. [Diagram 3] FIG. 1 is an exploded perspective view of a linear motor according to an embodiment. [Figure 4] FIG. 4 is a plan view of a primary member constituting the linear motor of FIG. [Diagram 5] FIG. 2 is a plan view of a bobbin for winding a coil. [Figure 6] 1 is an exploded perspective view of a linear motor in which a primary member and an armature module base are fixed via a spacer. [Figure 7] 7 illustrates an embodiment in which a windshield protrudes from the base of the linear motor of FIG. 6 towards the primary member. [Figure 8] This shows an embodiment in which a conduit through which a coolant passes is provided in a portion where the coil is wound between the armature modules. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a linear motor will be described in detail with reference to the accompanying drawings.

[0012] The inventor of the linear motor to which the embodiments of the present specification are applicable has filed a Korean patent application No. KR10-2010-0081522 for a linear motor having a primary member composed of a plurality of armature modules arranged in a row in the direction of travel, and a secondary member having one or more permanent magnet modules including a plurality of permanent magnets arranged with alternating poles in the direction of travel.

[0013] Among the linear motors described in application number KR10-2010-0081522, there is an open type linear motor as shown in FIG. 1, in which the connection part (or core) 11 of the armature module 10 is not C-shaped to surround the permanent magnet module, which is the secondary member, but is, for example, linear, and the multiple salient poles 12 protrude from the connection part 11 in the same direction, for example at right angles, and the multiple permanent magnet modules 20 of the secondary member also protrude toward the connection part 11 between the salient poles 12 arranged in a row.

[0014] In another linear motor described in Application No. KR10-2010-0081522, the salient poles in the core of the armature module have different protruding angles, which limits the cost of manufacturing dies and limits the accuracy of the motor. However, in the linear motor of FIG. 1, all the salient poles 12 in each armature module 10 form the same angle, for example a right angle, with respect to the connection portion 11, and each permanent magnet module 20 is also fixed at the same angle, for example a right angle, with respect to the permanent magnet base 22, which increases the manufacturing accuracy and reduces the cost of the dies.

[0015] The linear motor according to the embodiment of the present specification is a linear motor disclosed in the application No. KR10-2010-0081522, which is a modified version of the open type linear motor shown in Fig. 1 into a moving permanent magnet type. A conveyance system using a moving permanent magnet type linear motor enables long-distance conveyance by adjusting the interval between armature modules.

[0016] For example, the thrust force that moves the permanent magnet 21 is proportional to the sum of the surface areas of the contact between the salient pole 12 and the permanent magnet 21, and is also proportional to the number of armature modules 10 arranged in the direction of travel, and is proportional to the magnitude of the current applied to the coil 13, the number of turns of the coil 13 wound around the salient pole 12, the magnitude of the magnetic force of the permanent magnet 21, etc.

[0017] Thrust is generated based on a combination of the number S of armature modules 10, which is a multiple of the motor constant M, and the number P of permanent magnets 21, which is a multiple of 2 (north and south poles). Here, the motor constant M is 3 when the armature is driven by a three-phase power supply, and 5 when the armature is driven by a five-phase power supply, and is generally an odd number equal to or greater than 3. The phase difference of the current applied to the coils 13 of each armature module 10 is determined by the motor constant M.

[0018] Of course, when the length (length in the direction of movement) of the portion where S armature modules 10 and P permanent magnets 21 are opposed via a gap is defined as the unit length of the primary member, either the primary member made up of a plurality of armature modules 10 or the secondary member made up of a large number of permanent magnets 21 should be configured to be longer than the unit length, thereby ensuring an effective distance for generating thrust to move the mover.

[0019] In other words, the overlapping length between the primary and secondary members should be longer than the unit length (the number of armature modules 10 should be S or more, or the number of permanent magnets 21 should be P or more), thereby ensuring an effective distance for generating thrust, and the thrust increases in proportion to the area of ​​the gap formed between the overlapping primary and secondary members.

[0020] Three-phase current is applied to each armature module 10 (10U, 10V, 10W) ​​of the primary component in the order of UuU (or uUu) (U-phase group), VvV (or vVv) (V-phase group), and WwW (or wWw) (W-phase group) in the direction of travel, where lower case letters indicate that current of the opposite phase to that of the upper case letters is supplied.

[0021] Supplying currents of opposite phases can mean supplying different currents with a phase difference of 180 degrees to the windings wound on different salient poles, or it can mean supplying currents of the same phase to the windings, but winding the salient poles in different directions. From the standpoint of driving an electric motor, the latter is far more advantageous, since it means supplying current through a single line while simultaneously supplying two currents with a phase difference of 180 degrees.

[0022] Since the primary member is composed of independent armature modules 10 that are not connected to each other (made of the same ferromagnetic material as the core of the primary member), when the same magnitude of power source is provided to each armature module 10, the same magnitude of magnetic flux flows independently in each armature module 10, resulting in less deviation in the thrust generated through each armature module 10 and less ripple in the thrust.

[0023] The amount of magnetic flux passing through the salient pole 12 and the permanent magnet 21 is proportional to the area of ​​the overlapping portion between the surface of the salient pole 12 and the surface of the permanent magnet 21, assuming that the distribution of the magnetic flux entering and leaving the salient pole 12 is constant.

[0024] The cross section of the permanent magnet 21 through which the magnetic flux exiting from or entering the salient pole 12 of the armature module 10 passes is not limited to a rectangle or parallelogram, but may be a rhombus, circle or ellipse, or may be an octagon with the four corners of a rectangle or parallelogram cut off.

[0025] FIG. 2 illustrates a linear motor in which nine armature modules that make up the primary component are distributed and arranged, and illustrates an electric motor that uses one group of armature modules (9 modules) with three salient poles by applying the same principle as the linear motor illustrated in FIG. 1.

[0026] For example, in a motor with a basic unit (S, P) = (9, 8), nine armature modules may be arranged as an example and three-phase current may be applied in the order of uUuvVvwWw (or UuUVvVWwW). In order to increase the symmetric efficiency (symmetry) of the magnetic circuit in the linear motor and increase the thrust, a large value may be used for the number S of armature modules in the basic unit of the motor, a value close to S may be used for the number P of permanent magnets, and multiple basic units may be connected together for use.

[0027] When a large number of armature modules are arranged in succession on a primary member, a large amount of current is supplied to the primary member where the armature modules are densely packed, and heat causes deformation of the core and salient poles, reducing accuracy and causing cogging.

[0028] To solve problems such as thermal deformation and cogging and to improve accuracy, multiple armature modules are distributed in the primary member as shown in FIG. 2, and armature modules supplied with currents that are the same or 180 degrees out of phase (i.e., opposite phase) are grouped (bundled) together and separated from armature modules supplied with currents of a different phase (120 degrees out of phase).

[0029] 2, for example, when a motor is driven by a three-phase power source of UVW (where the motor constant M is 3), a U_phase group to which a uUu-phase current is supplied, a V_phase group to which a vVv-phase current is supplied, and a W_phase group to which a wWw-phase current is supplied are separated and distributed from one another. The armature modules of the U-phase group, V-phase group, and W-phase group are referred to as an armature module group or an armature block.

[0030] When armature modules supplied with current of the same phase are bundled together and arranged consecutively as an armature module group, the coils of the armature modules belonging to that group can be connected in series with each other. In this way, it is necessary to connect only a pair of wires to that group, which is advantageous for assembling the primary components and connecting the primary components to the controller.

[0031] In most linear motors other than the linear motor of this specification, the armature modules constituting the primary member have a structure in which they are connected and not separated from each other, so that currents of different phases must flow through adjacent armature modules. Therefore, in linear motors of other structures, it is impossible to arrange armature modules of the same phase consecutively as in FIG. 2.

[0032] The linear motor described with reference to FIGS. 1 and 2 generates linear motion by arranging a plurality of armature modules in a line along a linear direction and employing a permanent magnet module in which a plurality of permanent magnets are arranged in a line.

[0033] On the other hand, when a large amount of current is passed through the coil at a high frequency in order to increase the thrust or operating speed of the linear motor to which this specification is applied, a large amount of heat is generated in the primary member, which is made up of multiple armature modules arranged in the direction of travel, each of which has multiple protruding salient poles on which the coil is wound many times.

[0034] This specification provides a primary member structure that allows air to flow freely between the armature modules to cool the heat generated by the coils wound on the salient poles of the armature modules.

[0035] Fig. 3 is an exploded perspective view of a linear motor according to an embodiment, in which a secondary member formed of a plurality of permanent magnet modules is omitted.

[0036] The linear motor in FIG. 3 is configured to include a primary member including a plurality of armature modules 10 arranged along a first direction (Z direction in FIG. 3) which is the direction of travel, an armature module base 30 on which the plurality of armature modules 10 of the primary member are mounted, and a fan 40 attached to the armature module base 30.

[0037] Each armature module 10 is configured to include a connection portion 11 formed of a magnetic core, a plurality of salient poles 12, and a coil 13 wound around the salient poles 12.

[0038] A plurality of salient poles 12 arranged in a second direction (X direction in FIG. 3) protrude from the connection portion 11 in a third direction (Y direction in FIG. 3).

[0039] A coil 13 is wound around the salient pole 12 in the vicinity of the connection portion 11 .

[0040] One coil 13 is wound around one armature module 10, through which current of the same phase flows, and the directions in which the coil 13 is wound are different between adjacent salient poles 12.

[0041] 3, armature modules 10 wound with coils 13 through which currents of the same or opposite phases flow are grouped and arranged adjacent to each other. In other words, armature modules 10 to which currents of the same (or opposite) phases are supplied are grouped and arranged adjacent to each other, and are separated from armature modules 10 to which currents of a different phase (for example, 120 degrees out of phase) are supplied.

[0042] A group of armature modules 10 to which currents of the same (or opposite) phase are supplied is referred to as an armature block. In Fig. 3, a U-phase armature block 100U, a V-phase armature block 100V, and a W-phase armature block 100W are arranged in this order.

[0043] The spacing between adjacent armature modules 10 in each armature block 100U, 100V, 100W is constant. On the other hand, the spacing between the armature blocks 100U, 100V, 100W is different from the spacing between the armature modules 10 in the armature blocks 100U, 100V, 100W.

[0044] A first through hole 14 penetrating in a first direction is formed in each of the ends of the salient poles 12 and the connection portion 11 of the armature module 10. In addition, a stick (not shown) is passed through a through hole formed in a spacer (not shown) disposed between the first through hole 14 and the armature module 10, and the positions and intervals of the multiple armature modules 10 are fixed based on the first direction.

[0045] A second through hole 15 penetrating in a first direction is formed in at least one salient pole 12 of the armature module 10. The second through hole 15 is formed on the end side of the salient pole 12 where the coil 13 is not wound so as to be exposed to the outside. The second through hole 15 is exposed as it is without passing a stick through it when assembling a plurality of armature modules 10, allowing air to flow through it to cool heat generated from the coil 13 of the armature module 10.

[0046] The second through hole 15 has a larger cross section than the first through hole 14. Also, the second through hole 15 is formed in the central salient pole 12, which has a larger width in the second direction, as shown in FIG.

[0047] A base groove 31 is formed in the armature module base 30 on which the primary member is mounted, and a fan 40 is mounted in the base groove 31 .

[0048] The armature module base 30 also includes a windshield (or wall) 32 that projects in a direction toward the primary member that includes the plurality of armature modules 10 .

[0049] In FIG. 3, two windshields 32 are formed in each of the first direction (Z direction) and the second direction (X direction), but two may be formed only in the first direction (Z direction).

[0050] FIG. 4 is a plan view of a primary member that constitutes the linear motor of FIG.

[0051] In order to allow air to flow smoothly between the armature modules 10, the armature modules 10 are designed so that the coils 13 wound around adjacent salient poles 12 do not abut against each other, thereby providing a passage for air to flow.

[0052] For this reason, the interval a between adjacent armature modules 10 and the interval b between adjacent salient poles 12 in the same armature module 10 are made large.

[0053] Alternatively, the interval a between adjacent armature modules 10 is set to be larger than the interval b between adjacent salient poles 12 in the same armature module 10 .

[0054] FIG. 5 is a plan view of the bobbin 13_1 around which the coil 13 is wound.

[0055] The coil 13 is fitted to the salient pole 12 while being wound around the bobbin 13_1. At this time, the corners of the bobbin 13_1 that guide the coil 13 are rounded (R) to resemble the shape of the outer shell around which the coil 13 is wound, thereby minimizing the obstruction of air flow caused by the bobbin 13_1.

[0056] FIG. 6 is an exploded perspective view of a linear motor in which a primary member and an armature module base 30 are fixed via a spacer.

[0057] In FIG. 6, the fan 40 is attached to the armature module base 30, but the windshield 32 is not formed.

[0058] In the armature modules 10 in the armature block through which currents of the same phase flow, the spacing between two adjacent armature modules 10 is maintained constant by the first and second spacers 17, 18 at the ends of the salient poles 12 as well as at the connection portions 11.

[0059] The third spacer 19 enables the armature block and the adjacent armature block to maintain a constant distance between the armature modules 10 facing each other in two adjacent armature blocks.

[0060] The first and second spacers 17, 18 have the same length in the first direction, but the first spacer 17 (or the second spacer 18) and the third spacer 19 have different lengths in the first direction.

[0061] The first, second and third spacers 17, 18 and 19 are formed with through holes through which the through stick 16 passes through the first through hole 14 formed in the armature module 10.

[0062] Fastening means, such as rivets (not shown), are formed at both ends of the penetration stick 16. That is, the first armature module 10 and the last armature module 10 of the primary member are fixed together by the rivets.

[0063] In FIG. 6, a plurality of armature modules 10 are fixed to an armature module base 30 by second spacers 18 for maintaining the spacing between the armature modules 10 within the same armature block.

[0064] The second spacer 18 and the armature module base 30 are fixed to each other by means of screws or bolts having threads formed thereon.

[0065] The upper end of the second spacer 18 protrudes in the third direction (Y direction) beyond the upper end of the connection portion 11 of the armature module 10, and when the second spacer 18 is fixed to the armature module base 30, a gap is formed between the connection portion 11 of the armature module 10 and the armature module base 30.

[0066] The airflow created by the fan 40 travels through the gap between the armature module 10 and the armature module base 30 , and can dissipate heat generated from the coil 13 wound around the armature module 10 .

[0067] Alternatively, the multiple armature modules 10 may be fixed to the armature module base 30 by the third spacer 19 .

[0068] The first spacer 17 for maintaining the distance between two adjacent armature modules 10 is cylindrical with a hole in the center. Alternatively, the first spacer 17 may be cylindrical with a hole in the center and a cross-sectional area that is not circular but is a polygon. The through stick 16 is inserted into the center hole.

[0069] The second spacer 18 for fixing the armature modules 10 to the armature module base 30 while maintaining the interval between two adjacent armature modules 10 has a rectangular parallelepiped shape that is elongated in the second direction (X direction). The length of the second spacer 18 in the second direction corresponds to the length of the connection portion 11 of the armature module 10 in the second direction.

[0070] The second spacer 18 is formed to be elongated in the second direction (X direction) to increase the bonding strength between the second spacer 18 and the armature module base 30 or between the armature module 10 and the armature module base 30 .

[0071] When the second spacer 18 is sandwiched between two armature modules 10 and viewed from a first direction, the upper end of the second spacer 18 protrudes upward beyond the upper end of the connection portion 11 of the armature module 10.

[0072] Since the upper end of the second spacer 18 protrudes upward above the upper end of the connection portion 11 of the armature module 10, a gap is formed between the armature module 10 and the armature module base 30 when the second spacer 18 is fixed to the armature module base 30.

[0073] Furthermore, when second spacer 18 is viewed from the first direction, a recess that is lower than the upper end of second spacer 18 is formed in the middle of second spacer 18 (near the center in the second direction) based on the second direction (X direction). That is, second spacer 18 has a U-shaped cross section when viewed from the first direction, and a rectangular cross section when viewed from the second and third directions.

[0074] The recessed portion of the second spacer 18 is formed so that the second spacer 18 and the armature module base 30 are not in close contact over the entire section in the second direction (X direction) but are spaced apart over at least a portion of the section in the second direction.

[0075] Through the recess of the second spacer 18, the air flows smoothly in the first direction, and the air flow pressurized by the fan 40 travels to the armature module 10 located far away from the fan 40.

[0076] The three holes at the bottom when the second spacer 18 is viewed from a first direction are holes for passing the penetrating stick 16 that has passed through the first through hole 14 of the armature module 10, and the two holes on either side when the second spacer 18 is viewed from a third direction are holes for driving in screws or bolts to fix the second spacer 18 to the armature module base 30.

[0077] FIG. 7 illustrates an embodiment of the linear motor of FIG. 6 in which a windshield projects from the base towards the primary member.

[0078] As shown in FIG. 7, a windshield (or wall) 32 projects from the lower end of the armature module base 30 in a direction toward the primary member or armature module 10 .

[0079] As shown in FIG. 7, two windshields 32 are formed so as to be aligned outboard of the side salient poles 12 (the salient poles 12 on both sides in the X direction) located on both sides of the armature module 10 in the first direction (Z direction).

[0080] Alternatively, two additional windshields 32 are formed so as to be aligned outwardly of the first armature module 10 and the last armature module 10 of the primary member along the second direction (X direction).

[0081] The windshield 32 protrudes from the armature module base 30 to a position lower than the position at which the coil 13 is wound on the salient pole 12 of the armature module 10 .

[0082] The windshield 32 can prevent air generated by pressure accompanying the rotation of the fan 40 from escaping to the outside of the armature module 10 that is close to the fan 40 without reaching the armature module 10 that is far from the fan 40. In other words, the windshield 32 allows the airflow generated by the fan 40 to continue throughout the armature module 10 that constitutes the primary member.

[0083] FIG. 8 illustrates an embodiment in which a conduit for passing a coolant is provided in the portion where the coil is wound between the armature modules.

[0084] As shown in FIG. 8, in order to cool the heat generated from the coils 13 wound around the salient poles 12 of the armature modules 10, conduits 50 through which a coolant passes are disposed in the portions between the armature modules 10 where the coils 13 are wound.

[0085] Heat generated from the coil 13 through which a large amount of high frequency current flows is discharged to the outside through the coolant flowing in the conduit 50 .

[0086] The conduits 50 are fabricated in a staggered configuration and are coupled to the primary members in a manner that fits between the armature modules 10 .

[0087] Various embodiments of the linear motor of the present specification will be briefly and clearly described as follows.

[0088] A linear motor according to one embodiment includes a primary member including a plurality of armature modules, and a secondary member having a permanent magnet module including a plurality of permanent magnets arranged with changing poles in a first direction in which the plurality of armature modules are arranged, wherein either the primary member or the secondary member serves as a mover and the other serves as a stator, and they move relative to each other in the first direction, and each of the armature modules has a connection portion, a magnetic core including two or more salient poles protruding from the connection portion, and a coil wound around the magnetic core and connected so that current of the same phase flows, the permanent magnet module is placed between the two salient poles of the armature module, and the spacing between two adjacent armature modules is greater than the spacing between the two adjacent salient poles in the same armature module.

[0089] In one embodiment, the salient pole is formed with a hole penetrating in the first direction and exposed.

[0090] In one embodiment, the corners of a bobbin that is fitted onto the salient pole and guides the coil when it is wound are rounded.

[0091] In one embodiment, the linear motor further includes a spacer for maintaining a gap between the two adjacent armature modules, and a base for fixing the plurality of armature modules via the spacer, and the spacer forms a gap between the base and the connection portion of the armature module.

[0092] In one embodiment, the upper end of the spacer protrudes beyond the upper end of the connecting portion.

[0093] In one embodiment, when the spacer fixing the armature module and the base is viewed from the first direction, a recess that is lower than the upper end of the spacer is formed in the middle of the spacer based on the second direction in which the two or more salient poles are arranged.

[0094] In one embodiment, the linear motor further includes a fan attached to the base.

[0095] In one embodiment, the base includes a first windshield that protrudes toward the armature module and is formed outward of side salient poles located on both sides of the armature module along the first direction.

[0096] In one embodiment, the base further includes a second windshield protruding toward the armature module and formed outside a first armature module and a last armature module of the primary member along a second direction in which the two or more salient poles are arranged.

[0097] In one embodiment, the first windshield protrudes beyond a position on the armature module where the coil is wound, in a third direction in which the salient pole protrudes.

[0098] In one embodiment, the linear motor further includes a conduit through which a coolant passes, the conduit being disposed in a portion where the coil is wound between the two adjacent armature modules.

[0099] In one embodiment, the conduits are fitted between the armature modules in a staggered configuration and are coupled to the primary members.

[0100] It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the technical spirit of the present invention through the above description. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims. [Explanation of symbols]

[0101] 10 Armature Module 11 Connection 12 salient pole 13 Coil 13_1 Bobbin 14 First through hole 15 Second through hole (through hole) 16 Penetrating Stick 17 First spacer 18 Second spacer (spacer) 19 Third Spacer 20 Permanent Magnet Module 21 Permanent magnets 30 Armature module base 31 Base groove 32 Windshield 40 Fans 50 Conduit 100U, 100V, 100W Armature Block [Prior art documents] [Patent documents]

[0102] [Patent Document 1] Special Publication No. 2014-504129

Claims

1. a primary member including a plurality of armature modules; and a secondary member having a permanent magnet module including a plurality of permanent magnets arranged with alternating poles in a first direction in which the plurality of armature modules are arranged; One of the primary member and the secondary member serves as a mover and the other serves as a stator, and they move relative to each other in the first direction; Each of the armature modules has a connection portion, a magnetic core including two or more salient poles protruding from the connection portion, and coils wound around the magnetic core and connected so that currents of the same phase flow therethrough, the permanent magnet module is disposed between the two salient poles of the armature module; A linear motor, wherein the spacing between two adjacent armature modules is greater than the spacing between two adjacent salient poles in the same armature module.

2. The linear motor according to claim 1 , wherein the salient poles are formed with holes penetrating in the first direction and exposed.

3. 2. The linear motor according to claim 1, wherein the corners of a bobbin that is fitted onto the salient pole and that guides the winding of the coil are rounded.

4. a spacer for maintaining the spacing between the two adjacent armature modules; and a base for fixing the plurality of armature modules via the spacers; The linear motor of claim 1 , wherein the spacer forms a gap between the base and the connection portion of the armature module.

5. The linear motor according to claim 4 , wherein an upper end of the spacer protrudes beyond an upper end of the connecting portion.

6. 6. The linear motor according to claim 5, wherein, when the armature module and the spacer fixing the base are viewed from the first direction, a recessed portion that is lower than the upper end of the spacer is formed in the middle of the spacer based on the second direction in which the two or more salient poles are arranged.

7. The linear motor of claim 4 further comprising a fan mounted to the base.

8. 8. The linear motor according to claim 7, wherein the base includes a first windshield that protrudes toward the armature module and is formed outside side salient poles located on both sides of the armature module along the first direction.

9. 9. The linear motor according to claim 8, wherein the base further includes a second windshield that protrudes toward the armature module and is formed outside a first armature module and a last armature module of the primary member along a second direction in which the two or more salient poles are arranged.

10. 9. The linear motor according to claim 8, wherein the first windshield protrudes beyond a position of the armature module around which the coil is wound, in the third direction in which the salient poles protrude.

11. 2. The linear motor according to claim 1, further comprising a conduit through which a coolant flows, the conduit being disposed in a portion where the coil is wound between the two adjacent armature modules.

12. The linear motor of claim 11 , wherein the conduit is fitted between the armature modules in a staggered manner and coupled to the primary member.

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