JPH0739292U - Linear DC motor - Google Patents

Abstract

(57) [Abstract] [Purpose] When fixing a coreless armature with a screw, the head of the screw does not increase the air gap, and the non-magnetic body color becomes extra expensive.
Do not need to use. A through hole is formed on the non-magnetic substrate facing the screw hole, the through-hole having an engaging inclined surface with a reverse end spread that substantially matches the engaging inclined surface of the head of the flat head screw made of a non-magnetic material. A non-magnetic body color having an engaging inclined surface and a through hole is interposed between the magnetic substrate and the armature disposing member, and the engaging inclined surface of the countersunk screw serves as the engaging inclined surface of the through hole in the through hole. The screw parts of the countersunk screws are matched with each other and screwed into the screw holes formed in the armature disposing member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, when a coreless armature attached to a non-magnetic substrate such as a printed wiring board is attached and fixed to the armature disposing member with a screw, even if the above screw is used, the head of the screw is not attached. To prevent the air gap between the field magnets from increasing so as not to protrude from the surface of the magnetic body substrate to improve thrust efficiency, and to provide an inexpensive tubular non-magnetic body between the non-magnetic base plate and the armature mounting member. Even when an armature coil having a relatively large shape is used only by reinforcing it by interposing a color, it is possible to prevent the deflection of the non-magnetic substrate so that the corrugation of the entire non-magnetic substrate is prevented. It is easy to obtain a linear DC motor, such as a movable magnet type linear DC brushless motor, which is configured to prevent the above and to make the air gap between the non-magnetic substrate and the field magnet uniform. On the.

[0002]

[Prior art]

 3 to 5 show a movable magnet type linear DC brushless motor 1-1 as a conventional multi-pole / multi-phase type linear DC motor, which will be described below. The movable magnet type linear DC brushless motor 1-1 is mainly composed of a slider 2 which constitutes a moving element and a linear guide rail 3 which constitutes a stator.

The linear guide rail 3 is made of a magnetic material in order to serve also as a stator yoke on the fixed side. The coreless stator armature 4 is arranged along the moving direction of the slider 2. An armature-accommodating concave portion 5 is formed in which a cross section perpendicular to the moving direction of the slider 2 is a concave portion for accommodating.

An insulating sheet 22 [see FIG. 4] is provided on the upper surface of the armature housing recess 5 to electrically insulate the armature coil 8 and the linear motion guide rail 3 described later. . In this case, when the linear motion guide rail 3 is not made of a magnetic material, the insulating sheet 22 is preferably provided after the magnetic material plate is interposed.

On both rail side surfaces 6 of the linear guide rail 3, a load raceway groove 7 extending along the longitudinal direction of the linear guide rail 3 is formed.

On the upper surface of the armature housing recess 5 of the linear motion guide rail 3, a plurality of air-core type armature coils 8 are arranged so as not to overlap each other along the moving direction of the slider 2. A coreless stator armature 4 having a coreless structure is housed and arranged.

The armature coil 8 will be described. The armature coil 8 is formed by winding a large number of turns using a conductive wire so as to be an air-core type having a rectangular frame shape. It may be formed as a sheet coil using a means, a plating means or an etching means.

According to the air-core type armature coil group 8 as described above, the thrust force extending in the direction orthogonal to the traveling direction of the slider 2 can be adopted so that the linear reciprocating 180-degree energization method with good efficiency and performance can be adopted. When the open angle between the two effective conductor portions 8a and 8a that contributes to the generation is T, where one magnetic pole width in the traveling direction of the slider 2 of the field magnet 9 described later is T, The winding is formed so that

In the armature coil 8, the two conductor portions 8 b parallel to the moving direction of the slider 2 are conductor portions that do not contribute much to the generation of thrust. The armature coil 8 is formed such that the length between the two conductor portions 8b that do not contribute to the generation of the thrust and the outside of the conductor portion 8b is the same as the width of the field magnet 9 in that direction. There is.

The upper surface of each armature coil 8 group forming the coreless stator armature 4 has a longitudinal width almost equal to that of the armature coil 8 and prevents intrusion of dust and the like. Further, in order to protect the armature 4, a long plate-shaped printed wiring board 10 having a slightly larger lateral width is screwed and fixed by a screw 23. A printed wiring conductive pattern (not shown) is formed on the printed wiring board 10, and the armature coil 8 group and the armature coil 8 group are formed in accordance with the magnetic pole states of the armature coil 8 and the field magnet 9 through this pattern. Power is supplied to the magnetic pole discriminating element 21 such as a hall element for position detection for switching energization, and an output signal is obtained.

As the magnetic pole discriminating element 21, an appropriate magnetoelectric conversion element such as a hall IC, a hall element, or a magnetoresistive element may be used. The magnetic pole discriminating element 21 group includes a conductor portion where a conductor portion 8a that contributes to the thrust generated by the armature coil 8 and a conductor portion 8b that is orthogonal to the conductor portion 8a and that does not contribute to thrust generation intersect. It is arranged on the lower surface of the printed wiring board 10 facing the field magnet 9 on the extension line so that the magnetic poles of the N pole and the S pole of the field magnet 9 can be detected. Based on the output signal from the magnetic pole discriminating element 21 corresponding to the magnetic poles of the N pole and the S pole of the field magnet 9, a driver in an energization control circuit (not shown) operates to generate thrust in a predetermined direction. Thus, the armature coils 8 are energized in the appropriate direction.

The linear motion guide rail 3 accommodates a linear magnetic encoder scale 12 for accommodating a linear magnetic encoder scale 12 in parallel with the armature accommodating recess 5. A groove 13 is formed, and the linear magnetic encoder scale 12 is attached to the linear magnetic encoder scale housing groove 13 by using an adhesive or the like.

The slider 2 is made of an appropriate material, and has a lower surface for closing the magnetic path of a field magnet 9 formed in an inverted recessed shape when viewed from the running direction of the slider 2. A magnet yoke 11 made of a magnetic material is fixed, and L-shaped slide units 24 are attached to both sides of the magnet yoke 11 with screws 19 or the like.

On both inner surfaces of both sides of the slide unit 24, a load bearing groove 7 formed in the linear motion guide rail 3 is opposed and a load extending in the longitudinal direction along the moving direction of the slider 2 is provided. A raceway groove 15 is formed. A group of rolling elements (guide balls) 16 are interposed between the raceway grooves 7 and 15, and the raceway grooves 7 and 15 and the group of rolling elements 16 extend along the longitudinal direction of the raceway groove 7. The slider 2 is configured to be able to move smoothly.

The slide unit 24 communicates with the raceway grooves 7 and 15 inside the outer side of the raceway groove 15, and a return path 25 that allows the direction change and the reciprocal rolling by the end gap of the rolling element 16. To form an infinite circulation passage in which the rolling element 16 is incorporated so that it can roll freely.

The magnet yoke 11 is structured such that the air gap length (magnetic air gap length) between the linear motion guide rail 3 and the surface of the armature housing recess 5 is parallel. It has a planar lower inner surface 17 facing the above, and a field magnet 9 is provided on the surface of the lower inner surface 17 facing the armature 4 for relative movement.

On the inner surface 17 of the lower portion of the magnet yoke 11, magnetic poles of N and S poles are arranged so that adjacent magnetic poles have different polarities along the moving direction of the slider 2 (P is 2). In the present embodiment, the field magnet 9 having three poles is fixedly provided by using an appropriate means such as an adhesive for the convenience of the drawing.

In the portion of the inner surface 26 of the upper part of the slide unit 24 facing the linear magnetic encoder scale 12, the linear magnetic encoder scale 12 is alternately formed at a fine pitch. A magnetic sensor 18 for detecting the magnetic poles of the N pole and the S pole is attached via a normal magnetic gap, and the magnetic poles of the N pole and the S pole of the linear magnetic encoder scale 12 described above are attached to the fine multi-pole magnetic poles. I am able to detect. As a result, the magnetic sensor 18 counts the number of N-pole and S-pole fine multi-pole magnetized poles of the scale 12 for the linear magnetic encoder, so that the moving amount, moving speed, moving position, etc. of the slider 2 can be determined. As a result, the speed and position of the slider 2 can be servo-served.

In the linear DC brushless motor 1-1 having the above-described structure, the space extending in the longitudinal direction on both sides of the lower surface of the linear motion guide rail 3 which constitutes the stator yoke. A lead wire accommodating portion 30 is formed between the linear guide rail 3 and the fixed base 27 by providing the fixed base 28 on the lower surface of the spacer 27. After passing the lead wire 29 electrically connected to the terminal of the armature coil 8 through the printed wiring board 10 through the lead wire through hole 31 formed in the linear motion guide rail 3, linear DC It leads to the outside of the end of the brushless motor 1-1.

Since the stator armature 4 including the armature coil 8 group attached to the printed circuit board 10 makes a linear motion relative to the field magnet 9, a through hole 20 is formed in the printed circuit board 10. It is firmly fixed by screwing it to the linear guide rail 3 using the screw 23.

However, when the stator armature 4 including the armature coil 8 group attached to the printed wiring board 10 is screwed and fixed to the linear guide rail 3 by the screw 23, the head 23 a of the screw 23 is Since it protrudes above the printed wiring board 10, the air gap between the field magnet 9 and the linear motion guide rail 3 is increased only by the head portion 23a, and a large thrust cannot be obtained.

In this case, in order to obtain a smooth thrust, that is, in order not to generate a cogging torque, the screw 23 is made of a non-magnetic material.

In order to improve the drawbacks of the linear DC brushless motor 1-1, as shown in Japanese Utility Model Application Laid-Open No. 60-111384, which the applicant of the present application has previously presented, FIG. 6 and FIG. The movable magnet type linear DC brushless motor 1-2 has a collar 32a that engages with the outer periphery of the lower surface of the through hole 20 formed in the printed wiring board 10, and has a head 23a of the screw 23 on the inner periphery. Of the cylindrical non-magnetic body 32 having a collar 32b that abuts the lower portion of the printed wiring board 10 'by engaging the collar 32a with the outer peripheral portion of the lower surface of the through hole 20 of the printed wiring board 10'. The screw 23 is installed in the through hole 20 and then the screw 23 is inserted into the through hole 32c of the non-magnetic body color, and the lower portion of the head 23a of the screw 23 is linearly guided until it engages with the flange 32b. By screwing into the screw hole 33 provided in the rail 3, A stator armature 4 ″ composed of a group of armature coils 8 mounted on the printed wiring board 10 ′ is screwed and fixed to the surface of the linear guide rail 3.

As a result, in the linear DC brushless motor 1-2 shown in FIGS. 6 and 7, it is possible to eliminate the protrusion of the head 23a of the screw 23 on the upper surface of the printed wiring board 10 '. The defects of the linear DC brushless motor 1-1 shown in FIGS. 3 to 5 can be eliminated.

In the case of such a linear DC brushless motor 1-2, a stator armature 4'consisting of armature coils 8 mounted on the printed wiring board 10 'is firmly attached to the surface of the linear motion guide rail 3. Has the advantage that it can be fixed with screws.

However, the expensive non-magnetic material color 32 having the inner and outer circumferences of the collars 32a and 32b and having a large diameter must be used as the non-magnetic material color 32, which is a drawback that mass production is not possible at low cost.

The linear DC brushless motor 1-3 of the present application and the simultaneous application was made in order to eliminate the drawbacks of the linear DC brushless motors 1-1 and 1-2. The motor 1-3 will be described below with reference to FIGS. 8 and 9.

This linear DC brushless motor 1-3 has a reverse end spread which is substantially the same as the lower surface of the head portion 23'a of the countersunk screw 23 ', instead of the printed wiring board 10 having the through hole 20. Of the printed wiring board 10 ″ having the through hole 20 ′ having the inclined surface 10 ″ a of FIG. The difference is that a countersunk screw 23 'having a head 23'a having'b' is used.

Therefore, in this linear DC brushless motor 1-3, the lower inclined surface 23'b of the head portion 23'a of the countersunk screw 23 'expands in the reverse direction of the through hole 20' of the printed wiring board 10 ". Of the flat plate 23 ′ is inserted into the through hole 20 ′ of the printed wiring board 10 ″ by engaging the inclined surface 10 ″ a of the flat plate 10 ″, and the screw portion 23 ′ c of the flat plate screw 23 ′ is linearly guided. The coreless stator armature 4 '' consisting of the armature coil 8 group mounted on the printed wiring board 10 '' is screwed onto the linear motion guide rail 3 by being screwed into the screw hole 33 provided on the printed wiring board 10 ''. Stop and fix.

According to the above-mentioned movable magnet type linear DC brushless motor 1-3, when the armature coil 8 which constitutes the stator armature 4 ″ is small, the expensive non-magnetic body color as in the conventional case is used. Even if the -32 is not used, the shape of the printed wiring board 10 '' can be maintained by the armature coil 8 when the cavity in the frame of the armature coil 8 is small, so that the field magnet 9 and the printed wiring board 10 can be maintained. '', The air gap between them can be made uniform, and even if the non-magnetic material color 23 is not used, the sloped surface 10''a of the reverse divergence of the printed wiring board 10 '' and the head of the countersunk screw 23 '. The armature coil 8 mounted on the printed wiring board 10 ″ by engaging with the lower inclined surface 23 ′ of 23 ′ a can be firmly fixed to the surface of the linear motion guide rail 3 and yet the printed wiring board 10 ′. '' On the plate screw 23 ' Since the head 23'a of the head does not protrude, and the air gap due to the head 23'a of the flat head screw 23 'does not increase, an efficient linear DC brushless motor 1-3 can be easily and inexpensively provided. Can be formed.

[0031]

[Problems of conventional technology]

 The above-mentioned linear DC brushless motor 1-3 has an advantage that it can be formed at low cost because it does not need to use the non-magnetic body color 32 as described above, but it has a small armature coil 8 and a relatively small output. Is advantageous in the case of using a long effective conductor 8a that contributes to the generation of the thrust of the armature coil 8 in order to obtain a large thrust, or the width of one magnetic pole of the field magnet 9 is When using the armature coil 8 that is wide and has a large gap between the conductor portions 8b and 8b that do not contribute to the generation of thrust of the armature coil 8, the printed wiring board 10 '' is placed on the armature coil 8 group. When installed, the armature coil 8 has a large cavity inside the frame, so that the printed wiring board 10 ″ bends, and the entire printed wiring board 10 ″ corrugates and the printed wiring board 10 ″. Board 10 ' Scratches that a uniformed air gap between the field magnet 9, the movable magnet type linear direct current motor - motor, for example, a movable magnet type linear A DC brushless motor - can not be obtained data 1-3.

[0032]

[Problems of the present invention]

 The present invention obtains a large thrust by simply adding a slightly inexpensive tubular non-magnetic body color to the movable magnet type linear DC brushless motor 1-3 of the same application as the present application and assembling it. The purpose is to use a long effective conductor that contributes to the generation of armature coil thrust, or to use a conductor that does not contribute to the generation of armature coil thrust because the width of one pole of the field magnet is wide. Even in the case of the movable magnet type linear DC brushless motor 1-3 in the case of using the armature coil having a large space between them, the armature coil mounted on the non-magnetic substrate such as a printed wiring board is used as a starter -When using screws to attach and fix to the fixed side surface of the hook, etc., even if the above screws are used, the heads of the screws project above the substrate, increasing the air gap and reducing thrust. Prevent things Only by increasing the thrust efficiency and interposing an inexpensive tubular non-magnetic material collar between the non-magnetic material substrate and the fixed side of the stator yoke, etc. A linear structure that prevents the deflection of the magnetic substrate and prevents the waviness of the entire non-magnetic substrate and makes the air gap between the non-magnetic substrate and the field magnet uniform. The challenge was to obtain a DC motor, such as a movable magnet type linear direct current brushless motor.

[0033]

[Means for achieving the object of the present invention]

 The problem to be solved by the present invention is to provide a field magnet, in which the magnetic poles of N pole and S pole are arranged so that adjacent magnetic poles are different poles along the traveling direction of the mover, in the mover or the stator. In a linear DC motor in which a stator or a mover relatively facing the magnetic magnet has a multi-phase coreless armature having a non-magnetic substrate on the surface of the field magnet in the armature disposing member, A screw hole extending in the direction opposite to the field magnet is formed in the armature disposing member, and the non-magnetic substrate facing the screw hole has a reverse hole that substantially coincides with the inclined portion of the head of the flat head screw. A through hole having an inclined surface that spreads toward the end is formed, and a cylindrical non-magnetic member for preventing bending of the non-magnetic material substrate is provided between the non-magnetic material substrate and the armature disposing member in the vicinity of the inclined surface of the through hole. A flat head screw of the flat head screw is inserted through the through hole through a magnetic body color. A coreless armature provided with the non-magnetic substrate on the surface facing the field magnet by matching the inclined surface of the through hole and screwing the screw part of the countersunk screw into the screw hole formed in the armature disposing member. This can be achieved by providing a linear DC motor characterized in that it is fixed to the armature disposing member surface facing the field magnet of the armature disposing member.

Another subject of the present invention is that the polyphase coreless armature is formed of an air-core type armature coil group, and is substantially coincident with the inclined portion of the head of the flat head screw formed on the non-magnetic substrate. Such a through hole having an inclined surface that spreads in the opposite direction can be achieved by forming it at the position of the non-magnetic substrate facing the cavity in the frame of the armature coil.

[0035]

[Examples of the present invention]

 FIG. 1 is a vertical sectional view of a movable magnet type linear DC brushless motor 1-4 of the present invention seen from the traveling direction of a mover, and FIG. 2 is a diagram of the movable magnet type linear DC brushless motor 1-4. FIG. The description of the parts common to the above-mentioned conventional example will be omitted by referring to the above description, and only the different parts will be described below.

In the linear DC brushless motor 1-4 of the present invention, in the linear DC brushless motor 1-3 described above, the lower surface 23'b of the head 23'a of the flat head screw 23 'is printed. The plate screw 23 'is inserted into the through hole 20' of the printed wiring board 10 '' 'by engaging the inclined surface 10' '' a of the through hole 20 'of the wiring board 10' '' which is widened in the reverse direction to insert the plate screw 23 '. When the screw 23 'is screwed into the screw hole 33 provided in the linear motion guide rail 3, a portion near the inclined surface 10' '' a of the through hole 20 'is previously prepared. In this embodiment, the printed wiring board is used. A cylindrical non-magnetic material collar having no flange on the inner and outer circumferences for preventing the deflection of the printed wiring board 10 '' 'between the lower portion of the inclined surface 10' '' a of 10 '' 'and the linear guide rail 3. -32 'is erected and inserted, and the countersunk screw 23' is passed through the through hole 20 'and the countersunk screw 23 The lower surface of the head portion 23'a of the 'is aligned with the inclined surface 10' '' a of the through hole 20 ', and the lower screw portion 23'c of the countersunk screw 23' is attached to the linear motion guide rail 3. A stator armature 4 "" having the printed wiring board 10 "" mounted on the upper surface by screwing into the screw hole 33 formed on the upper surface of the linear motion guide rail 3 is screwed and fixed. .

[0037]

[Effect of device]

 According to the linear DC motor of the present invention, when the armature coil that constitutes the armature is large, it is possible to reverse the non-magnetic substrate without using the expensive non-magnetic color that is large in diameter as in the conventional case. Non-magnetic material that engages the sloping sloping surface and the lower sloping surface of the head of the flat head screw. The armature coil mounted on the substrate can be firmly fixed to the mounting surface, and it is an inexpensive cylindrical non-magnetic material. Since the inclined portion of the non-magnetic substrate is reinforced by the body color, the gap between the field magnet and the printed wiring board can be made uniform without increasing the air gap caused by the head of the screw, and the non-magnetic substrate can be colored. Even if a large air-core type armature coil is used, the non-magnetic substrate placed on the upper surface of the armature coil group will not bend, and the entire non-magnetic substrate can be prevented from waving. Between the non-magnetic substrate and the field magnet Efficiency and reliable linear A DC can be made uniform gap motor - motor, for example, a movable magnet type linear brushless DC motor - can be easily formed to obtain the data.

It should be noted that the present invention, regardless of whether it is a movable magnet type, a movable armature type, or a commutator type of rectifying using a brush and a commutator, is a brushless linear DC motor. It goes without saying that it applies to any case.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a multi-pole / multi-phase type movable magnet type linear DC brushless motor showing an embodiment of the present invention as seen from the traveling direction of a mover.

FIG. 2 is a partial cross-sectional view of the movable magnet type linear DC brushless motor.

FIG. 3 is a top perspective view of a multi-pole / multi-phase movable magnet type linear DC brushless motor with some cutouts omitted.

FIG. 4 is a vertical cross-sectional view of a conventional multi-pole / multi-phase movable magnet type linear DC brushless motor as seen from the traveling direction of the mover.

FIG. 5 is a partial cross-sectional view of the movable magnet type linear DC brushless motor.

FIG. 6 is a vertical cross-sectional view of another conventional multi-pole / multi-phase movable magnet type linear DC brushless motor as seen from the traveling direction of the mover.

FIG. 7 is a partial cross-sectional view of the movable magnet type linear DC brushless motor.

FIG. 8 is a longitudinal cross-sectional view of another multi-pole / multi-phase type movable magnet type linear DC brushless motor of the applicant of the present application, which is related to the application filed on the same date as the moving direction of the mover.

FIG. 9 is a partial cross-sectional view of the movable magnet type linear DC brushless motor.

[Explanation of symbols]

1-1 Movable Magnet Type Linear DC Brushless Motor 1-2 Movable Magnet Type Linear DC Brushless Motor 1-3 Movable Magnet Type Linear DC Brushless Motor 1-4 Movable Magnet Type Linear DC Brushless Motor 2 Slider 3 Linear motion guide rails 4, 4 ', 4 ", 4'" Coreless stator armature 5 Armature housing recess 6 Rail side surface 7 Track groove 8 Armature coil 8a Contributes to thrust generation Conductor part 8b Conductor part that does not contribute to generation of thrust 9 Field magnet 10, 10 ', 10'',10''' Printed wiring board 10''a Inclined surface 11 Magnet yoke 12 Linear magnetic encoder scale -Rail 13 Scale groove for linear magnetic encoder 15 Track groove 16 Rolling element 17 Lower inner surface 18 Magnetic sensor 19 Screw 20 Through hole 20 'Through hole 21 Magnetic pole discriminating element 22 Insulation shield -To 23 screw 23 'countersunk screw 23a head 23'a head 23'b lower surface inclined part 24 slide unit 25 return path 26 lower inner surface 27 spacer 28 fixed base 29 lead wire 30 lead Lead wire receiving groove 31 Lead wire through hole 32 Non-magnetic body color 32a, 32b Collar 32c Through hole portion 32 'Non-magnetic body color 33 Screw hole

Claims (2)

[Scope of utility model registration request] 1. A field magnet, in which magnetic poles of N pole and S pole are arranged so that adjacent magnetic poles are different poles along the traveling direction of the mover, is provided in the mover or the stator, and the field magnet is provided. In a linear DC motor in which a stator or a mover that is relatively opposed to a multi-phase coreless armature having a non-magnetic substrate on a field magnet surface is arranged in an armature disposing member,
A screw hole extending in a direction opposite to the field magnet is formed in the armature disposing member, and the non-magnetic substrate facing the screw hole has a reverse hole substantially matching the inclined portion of the head of the flat head screw. A through hole having an inclined surface diverging toward the end is formed, and a cylindrical non-magnetic body color is formed between the non-magnetic substrate and the armature disposing member in the vicinity of the inclined surface of the through hole to prevent the non-magnetic substrate from bending. -Through the flat screw through the through hole so that the inclined portion of the head of the flat screw coincides with the inclined surface of the through hole, and the screw portion of the flat screw is inserted into the screw hole formed in the armature disposing member. A coreless armature provided with the non-magnetic substrate on a field magnet facing surface by screwing is fixed to an armature mounting member surface of the armature mounting member facing the field magnet. Linear DC motor. 2. The multi-phase coreless armature is composed of an air-core type armature coil group, and has an inclined surface having a reverse end spread which substantially coincides with the inclined portion of the head of the flat head screw formed on the non-magnetic substrate. 2. The linear DC motor according to claim 1, wherein the through hole is formed at a position of the non-magnetic substrate facing the hollow portion in the frame of the armature coil.