JPH1189209A - Linear motor and device utilizing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the length of two linear motors when the motors are mechanically connected in series. SOLUTION: Two iron cores 111 and 112 constituting an armature are arranged in series. Then, U-, V-, and W-phase windings 113, 114, and 115 are wired in series against the cores 111 and 112, so that each of the windings 113, 114, and 115 may form two poles at the cores 111 and 112. The windings 113, 114, and 115 are wound in the same direction at the sections where the windings 113, 114, and 115 respectively form the closest both poles on both sides of the facing end sections of the adjacent cores 111 and 112.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a linear motor,
For example, the present invention relates to a linear motor suitable for use in a feed bar driving device.

[0002]

2. Description of the Related Art When a feed bar of a transfer press is driven by a linear motor, the following three cases are considered depending on whether an armature or a field of the linear motor is attached to a fixed portion or a movable portion of the press. Can be

As shown in FIG. 15A, in a case where the armature 201 is fixed and the field 202 is movable, assuming that the stroke of the linear motor is L and the length of the armature 201 is L ′. , The length of the field 202 becomes L + L ′,
The length of the motor 202 is 2L + L '.

FIG. 15B shows a case where the armature 203 is on the movable side and the field 204 is on the fixed side. In this case, the length that the armature 203 motor can tighten is L +
L 'is enough. Comparing (a) and (b), (b) is advantageous in terms of the length of the motor, as (b) is shorter than (a).
When a linear motor is mounted on a press, it is often the case that the linear motor is housed in a box-shaped housing and the housing is mounted in a cantilevered state on a press frame. In such a case, if the length of the linear motor is long, the possibility of a vibration problem increases. On the other hand, in this case, it is necessary to move the power supply cable as a flexible one. During the high-speed reversal operation, the power supply cable may malfunction due to vibration.

FIG. 15C shows a case in which two armatures 205 and 206 are connected in series, this is used as a fixed side, and the field 207 is used as a movable side. In this case, the field 20
If the length of 7 is set to L ', the same thrust as in (a) and (b) is obtained, and the length of the motor is L + L'.
There is no need to move the power supply cable, which is more advantageous than either of the above two cases.

[0006] In the above, the reason for using two armatures connected in series mechanically is that it is difficult to manufacture an armature having a length corresponding to the two armatures.

FIG. 16 shows an example of a connection state when two armatures are connected. The two armatures are identical and are of the 9-slot, 2-pole type. The winding of the winding is so-called full-pitch winding, and is wound so as to form one coil over four continuous slots.

[0008] Looking at the armature on the right side, U
Phase, reverse V phase, W phase, reverse U phase, V phase and reverse W phase windings are formed. In the present invention, the U-phase winding and the inverted U-phase winding are:
Refers to the winding directions opposite to each other. Similarly, each phase winding is also formed on the left armature. 2
In each phase winding of one armature, the U-phase winding
1, the V-phase winding is connected by an external connection 212 and the W-phase winding is connected by an external connection 213.

When the two armatures are connected as described above, the pole pitch of the NS of the field, the U-phase winding and the reverse U-phase winding, the V-phase winding and the reverse V-phase winding, and the W-phase winding In order to make the pole pitch of the field and the pole pitch of the two armatures relative to each other so that the pole pitch of the wire and the reverse W-phase winding is P, and the thrust is obtained as a motor, the relative pitch of the two armatures is set. The distance between the two slots closest to each other with the end portion between them is 4P / 3. The interval between the two slots corresponds to the interval between the two armatures,
As the distance between the two armatures increases, the overall length of the linear motor increases.

[0010]

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a linear motor whose overall length can be made as short as possible and a transport using the same.

[0011]

In a linear motor according to the present invention, a plurality of iron cores constituting an armature are arranged in series, and U-phase, V-phase, and W-phase windings are provided on these iron cores. In the winding forming at least one phase out of the U-phase, V-phase and W-phase windings so as to form a plurality of poles respectively, the closest approach sandwiching opposing ends of adjacent iron cores The winding directions of the windings at the portions forming both poles are the same.

In the linear motor according to the present invention, the pitch of the closest slots sandwiching the opposite ends of the adjacent iron cores may be 1/3, 2/3, and 3/3 of 1/3 of the pole pitch. it can.

In the case of the full-pitch winding, if the winding directions of the U-phase, V-phase and W-phase windings are all the same, the pitch of both slots can be reduced to 1/3 of the pole pitch. If the windings of the V-phase and W-phase windings are the same, the pitch of both slots can be reduced to 2/3 of the pole pitch. Further, if only the winding method of the W-phase winding is the same, the pitch of both slots can be reduced to 3/3 of the pole pitch.

In the case of a tooth winding (see FIGS. 11 to 13), the pole pitch of the NS of the field is set to P, and the closest windings sandwiching opposite ends of the adjacent iron cores are set to the W phase and the V phase. Then, the distance between the closest slots sandwiching the opposing ends of the adjacent iron cores can be made 6P / 3. Further, if the closest windings sandwiching the opposite ends of the adjacent iron cores are W-phase and W-phase, the interval between the two slots can be made 4P / 3. Furthermore, if the closest windings sandwiching the opposing ends of the adjacent iron cores are W-phase and U-phase, the interval between the two slots can be 2P / 3.

Therefore, it is possible to provide a linear motor having a shorter overall length than the conventional one described at the beginning.

Further, each iron core has nine slots, the winding is wound in a full-pitch manner, and the pitch of the closest slots sandwiching opposite ends of adjacent iron cores is as follows: It may be 1/3 of the pole pitch. Then, the shortest linear motor is provided.

In order to make the shortest linear motor,
Each core has four slots, the winding is wound in a tooth winding, and the pitch of both closest slots sandwiching the opposite ends of adjacent cores is ２ of the pole pitch. It may be.

When the above-described linear motor is used in a transporting device such as a feed bar driving device, the linear motor can be easily incorporated into the transporting device because the overall length of the linear motor is short.

Further, when the armature is fixed to the press frame and the field is fixed to the feed bar, troubles due to vibration can be prevented, and since the movable part is small and the movable weight is small, the operation frequency is high. When electricity consumption is low.

[0020]

FIG. 1 shows an embodiment of the present invention.
Next, a description will be given with reference to FIG.

Before describing the linear motor, a transfer press equipped with the linear motor will be described with reference to FIGS.

In the following description, the front and rear refer to the right side of FIG. 1 as the front and the opposite side to the rear with reference to FIG.
The left and right are defined as left and right when viewed from behind.

The transfer press is provided with a pair of left and right feed bars 11 extending in the front-rear direction.
A pair of left and right front and rear clamp / lift units 12 for moving left and right and up and down respectively, and both feed bars 11 are free to move up and down and left and right, but are restricted from moving back and forth. And a pair of left and right feed carriers 13
A pair of left and right L-shaped connecting members 14 respectively connecting the rear end of the feed carrier 13 and the feed carrier 13, and a left and right pair of right and left mounted on a press body (not shown) projecting rearward and suspending the feed carrier 13 to be able to move back and forth It includes a pair of brackets 15 and a pair of left and right feed units 16 for moving the feed carrier 13 back and forth.

The left and right feed bars 11, the clamp / lift unit 12, the feed carrier 13, the connecting member 14, the bracket 15, and the feed unit 16 are the same.

The front and rear horizontal feed guide rails 21 extending in the front-rear direction are provided on the lower surface of the feed bar 11 where the clamp / lift unit is provided. On the rear end face of the feed bar 11, a lift guide member 22 with a vertical guide groove is provided.

The clamp / lift unit 12 has a box-shaped casing 32 having a slit 31 extending in the left-right direction on the top wall.
And an operating rod 33 that is passed through the slit 31 and protrudes upward. A drive mechanism (not shown) is housed in the casing 32. The driving mechanism is a well-known one driven by a rotary motor. The actuation rod 33 is moved left and right and up and down by the drive mechanism. Feed guide rail at the end of the operating rod 33
Feed guide member with vertical guide groove fitted to 21
34 are installed. The horizontal movement and the vertical movement of the operating rod 33 cause the feed bar 11 to perform a clamping operation and a lifting operation.

A motor mounting ridge 41 is provided at the center of the upper surface of the feed carrier 13 in the left-right direction, and a pair of motor guide members 42 with guide grooves extending in the front-rear direction parallel to each other are provided on both sides thereof. . On the lower surface of the feed carrier 13, a pair of front and rear clamp guide rails 43 extending in the left-right direction in parallel with each other are provided.

On the rear surface of the connecting member 14, a lift guide member is provided.
A lift guide rail 51 fitted into 22 is provided. On the upper surface of the connecting member 14, a clamp guide rail 43
A clamp guide member 52 with a guide groove into which the groove is fitted is provided.

The lower surface of the bracket 15 is provided with a motor housing recess 61 extending in the front-rear direction in which the motor mounting ridges 41 are fitted at intervals in the left-right direction.
A pair of left and right motor guide rails 62 fitted into the motor guide member 42 is provided at the opening edge.

The feed unit 16 is constituted by a synchronous linear motor 71 for feed. Linear motor
71 has a pair of coil plates 72 as fixed parts and a pair of magnet plates 73 as moving parts. Double coil plate
Reference numeral 72 is vertically fixed to the opposite side surface of the motor housing recess 61. The two magnet plates 73 are vertically fixed to the opposite side surface of the motor mounting ridge 41.

When a current is applied to the coil plate 72 so as to generate a moving magnetic field, the magnet plate 73 moves by receiving a force attracted and repelled by the current. The feed carrier 13 is moved together with the magnet plate 73, so that the feed bar 11 performs a feed operation. During the feed operation,
The clamp operation of the feed bar 11 by the clamp / lift unit 12 is performed by the clamp guide member 43 and the clamp guide rail 52, and the lift operation is performed by the lift guide member.
22 and lift guide rail 51 cancel each.

In the above example, the linear motor is used only for the feed operation of the feed bar. However, a linear motor may be used for performing the clamp operation and the lift operation of the feed bar.

Next, the linear motor will be described in detail.

The coil plate 72 has an armature shown in FIGS.
It is equipped with 101. The armature 101 includes two right iron cores 111 and left iron cores 112 arranged in series in the left-right direction, and U-phase, V-phase, and W-phase windings 113, 114, and 115 wired in series with these iron cores 111 and 112, respectively.

The two iron cores 111 and 112 have nine slots 12 each.
1,122. The leftmost slot of the right core 111
The interval between the slot 121 at the right end of the iron core 112 on the left side and the slot 121 is 1/3 of the pole pitch P. Winding 113,114,11
Numeral 5 is a so-called all-turn winding which is wound in a coil shape over four continuous slots 121 and 122 to form one pole.

FIG. 5 shows the U-phase winding 113.
In the iron core 111 on the right, the first slot counted from the right
One coil 13 from 121 to the fourth slot 121
1 is formed, and one coil 132 is formed from the fourth slot 121 to the seventh slot 121.
As viewed from the near side, the winding of the right coil 131 is clockwise, and the winding of the left coil 132 is counterclockwise. The right coil 131 and the left coil 132 are connected by a right internal connection 133. In the iron core 112 on the left,
Similarly to the iron core 111 on the right side, counting from the right, one coil 134 is formed from the first slot 122 to the fourth slot 122, and one coil 135 is formed from the fourth to seventh slot 122. I have. The winding of the coils 134 and 135 of the left core is opposite to that of the right core 111, and the winding of the right coil 134 is counterclockwise as viewed from the near side, and the winding of the left coil 135 is viewed from the near side. Is clockwise. Right coil 134 and left coil 135
Are connected by a left internal connection 136. The left coil 132 of the right iron core 111 and the right coil 134 of the left iron core 112 are connected by an external connection 137 straddling the connection end of the two cores 111 and 112.

FIG. 6 shows a V-phase winding 114.
In the left and right cores 111, 112, the winding 114 starts at the second slot 121, 122 and ends at the eighth slot 121, 122. The winding of the right coil 141 of the right iron core 111 is counterclockwise, and the winding of the left coil 142 is clockwise. In the left core 112, the winding directions of the right coil 144 and the left coil 145 are the same as those of the right core 111.
The opposite of the one. Each coil 141, 142, 144, 145 has a corresponding one, an internal connection 143, 146 and an external connection 14
Connected by 7

The winding of the W-phase winding 115 is shown in FIG. The winding 115 extends from the third slot 121,122 to the ninth slot 121,122 for both the left and right iron cores 111,112. The winding directions of the coils 151 and 152 of the right iron core 111 and the winding directions of the coils 154 and 155 of the left iron core 112 are as follows.
This is the same as the case of the U phase. Similarly, each coil is provided with an internal connection 153, 156 and an external connection 157.

U-phase, V-phase and W-phase windings 113, 114, 115
8 is schematically shown in FIG. In addition,
FIG. 8 also shows the external connections 137, 147, and 157. The right iron core 111 has a U phase, a reverse V phase,
W-phase, reverse U-phase, V-phase and reverse W-phase windings are formed. On the left core 112, the phases of the right core 111 are reversed to form a reverse U phase, V phase, reverse W phase, U phase, reverse V phase, and W phase winding. Here, left 3 of iron core 111 on the right
Focusing on the three phases and the right three phases of the iron core 112 on the left side,
Each of the three phases is an inverted U phase, a V phase, and an inverted W phase, which means that the winding directions of the coils forming the left three phases of the right core 111 and the left core, respectively. 11
2 mean that the winding directions of the coils forming the three right phases are the same.

FIG. 9 shows a modification of the armature. In this modification, the pitch between the leftmost slot of the right iron core 111 and the rightmost slot of the left iron core 112 is two pole pitches P.
/ 3. As shown in FIG. 8, the U-phase, reverse V-phase, W-phase and reverse U-phase
Phase, V-phase and reverse W-phase windings are formed. The V-phase, reverse W-phase, U-phase, and reverse V
Phase, W-phase and inverted U-phase windings are formed. As in the case of FIG. 8, focusing on the three left phases of the right iron core 111 and the three right phases of the left iron core 112, the V phase and the W phase are the same in the opposite direction, but only the U phase is the same. The reverse is reversed. This means that the winding directions of the V-phase and W-phase windings of the right and left cores are the same, but the winding directions of the U-phase winding are opposite.

FIG. 10 shows another modification of the armature. In this modification, the pitch between the leftmost slot of the right iron core 111 and the rightmost slot of the left iron core 112 is 3/3 of the pole pitch P. The iron core 111 on the right side
U phase, reverse V phase, W phase,
Reverse U-phase, V-phase and reverse W-phase windings are formed. The order of the phases of the iron core 112 on the left side is reverse W phase, U phase, reverse V phase, W phase,
Inverse U-phase and V-phase. The same as the three inverted U-phase, V-phase and inverted W-phase of the left core 111 of the right core 111
Then, there is only the reverse W phase. Right and left iron core 111,112 W
Only the winding directions of the phase winding coils are the same, and the winding directions of the U-phase and V-phase winding coils are opposite.

In the above, the case of the all-winding has been described. Next, the case of tooth winding will be described. Here, let P be the pole pitch of the field NS. In the tooth winding, two poles are formed by windings 163, 164, 165 wound on two adjacent slots. When two poles are formed in one core, the number of slots required is four.

FIGS. 11, 12 and 13 show the three phases of the right and left iron cores 161 and 162, and the winding direction of each phase is the same. Also, the windings of the two cores are repeatedly circulated and arranged without impairing this order, so that the V phase is next to the U phase, the W phase is next to the V phase, and the U phase is next to the W phase. You.

FIG. 11 shows that the distance between the left end slot of the right iron core 161 and the right slot of the left iron core 162 is 2
It is an example of P / 3. With the adjacent iron core 161
The winding 162 is assumed to have one winding that does not actually exist between the two cores.
And the U-phase, V-phase and W-phase are circulated repeatedly.

FIG. 12 shows that the distance between the leftmost slot of the right iron core 161 and the right slot of the left iron core 162 is four.
It is an example of P / 3. With the adjacent iron core 161
The winding 162 is assumed to have two windings that do not actually exist between the two cores.
, The U-phase, V-phase and W-phase are circulated and arranged repeatedly.

FIG. 13 shows that the distance between the left end slot of the right iron core 161 and the right slot of the left iron core 162 is 6 mm.
It is an example of P / 3. With the adjacent iron core 161
The winding 162 is assumed to have three windings that do not actually exist between the two cores.
, The U-phase, V-phase and W-phase are circulated and arranged repeatedly.

FIG. 14 shows the magnet plate 73. The magnet plate 73 has three magnets 171,172,173
Are lined up in a row. The pitch between adjacent magnets is equal to the pole pitch P. Three magnets 171,
172 and 173 have an N pole, an S pole and an N pole on the upper surface side facing the armature.

[0048]

[Other Embodiment] In FIG. 5, the terminal 11 of the right iron core 111 is shown.
Since the current flowing into 3a and the current flowing into terminal 113b of left iron core 112 are the same, currents may be supplied from different power sources.

In FIG. 6, the terminal 114a of the right iron core 111
The current flowing into the terminal 114b of the iron core 112 on the left side is the same as the current flowing into the terminal 114b, but the currents may be supplied from different power sources.

In FIG. 7, the terminal 115a of the iron core 111 on the right side
And the current flowing into the terminal 115b of the iron core 112 on the left side is the same, so that the currents may be supplied from different power sources.

The iron core 111 on the right side of FIG. 8, FIG. 9 and FIG.
Is 9 slots, but 9 + 3n (where n = 0,
1, 2,...) Slot.

The iron core 112 on the left side of FIGS.
Is 9 slots, but 9 + 3n (where n = 0,
1, 2,...) Slot.

In the case of the tooth winding, similarly to the full winding, the current flowing into the right iron core 161 and the left iron core 162 are the same, so that separate power supplies or currents may be supplied.

Iron core on the right side of FIGS. 11, 12 and 13
161 is 4 slots, but 4 + 3n (where n = 3
0, 1, 2,...) Slot.

Iron core on the right side of FIGS. 11, 12 and 13
162 is 4 slots, but 4 + 3n (where n =
0, 1, 2,...) Slot.

In FIG. 14, there are three magnets 171, 172, and 173 mounted on the magnet plate 73. The N-pole magnet and the S-pole magnet have a pole pitch P.
3 + n (where n =
0, 1, 2,...).

FIGS. 5, 6, 7, 8, 9, 10,
In FIGS. 11, 12 and 13, two iron cores are arranged in series, but a plurality of iron cores may be arranged in series.

FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG.
The windings in FIGS. 11, 12 and 13 are concentrated windings, but may be distributed windings.

FIGS. 5, 6, 7, 8, 9 and 1
The winding of 0 is a full-section winding, but may be a short-section winding.

The distance between the closest slots sandwiching opposite ends of adjacent iron cores in FIGS. 5, 6, 7 and 8 is as follows.
Each is 1/3, 2/3 and 3/3 of the pole pitch of the field NS, but n / 3 (where n = 4, 5, 6,...)
・ ・) It does not matter.

The distance between the closest slots sandwiching the opposite ends of the adjacent iron cores in FIGS. 11, 12 and 13 is as follows:
2/3, 4/3 and 6/3 of the pole pitch of the field NS, but 2n / 3 (where n = 4, 5, 6,...)
But that's OK.

[0062]

According to the present invention, the overall length of the linear motor can be shortened with high resistance to vibration. Moreover, a linear motor having a short overall length and a feed bar driving device using the same can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a feed bar driving device using a linear motor according to the present invention.

FIG. 2 is a side view of the device.

FIG. 3 is a transverse sectional view taken along a line III-III in FIG. 2;

FIG. 4 is a perspective view of a main part of the device.

FIG. 5 is an explanatory diagram of a U-phase connection of an armature of the linear motor.

FIG. 6 is an explanatory diagram of the V-phase connection.

FIG. 7 is an explanatory diagram of the W-phase connection.

FIG. 8 is an explanatory diagram of the connection of the armature in the case of full-section winding corresponding to the case shown in FIGS. 5 to 7;

FIG. 9 is a connection explanatory view showing a modification of the armature.

FIG. 10 is a connection explanatory view showing another modification of the armature.

FIG. 11 is a connection explanatory diagram showing a case of tooth winding of the armature.

FIG. 12 is a connection explanatory view showing a modification of the armature in the case of tooth winding.

FIG. 13 is a connection explanatory view showing another modification of the armature in the case of tooth winding.

FIG. 14 is a perspective view of a magnet plate constituting the linear motor.

FIG. 15 is an explanatory view showing how to mount a linear motor.

FIG. 16 is an explanatory diagram of connection of a conventional linear motor.

[Explanation of symbols]

 11 Feed bar 72 Coil plate 73 Magnet plate 101 Armature 111 Iron core 112 Iron core 113 U phase winding 113a U phase winding terminal 113b U phase winding terminal 114 V phase winding 114a V phase winding terminal 114b V phase winding terminal 115 W phase winding terminal 115a W phase winding terminal 115b W phase winding terminal P pole pitch

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masatada Tanaka 1-28-28 Jiyugaoka, Kanazu-cho, Sakai-gun, Fukui Fukui Machinery Co., Ltd.

Claims (6)

[Claims] 1. A plurality of iron cores constituting an armature are arranged in series, and U-phase, V-phase and W-phase windings are wired on these iron cores so as to form a plurality of poles in each iron core. And windings of windings forming at least one of the U-phase, V-phase and W-phase windings at portions respectively forming closest poles sandwiching opposite ends of adjacent iron cores. A linear motor whose direction is the same. 2. Each iron core is 9 + 3n (where n = 0,
1, 2,...) Having this slot, the distance between the closest slots sandwiching the opposing ends of the adjacent iron cores is n / 3 of the field NS pole pitch (where n = 1, 2, 3,
...). 3. Each iron core is 4 + 3n (where n = 0,
1, 2,...) Has this slot, the winding is wound in a tooth winding, and the distance between the closest slots sandwiching opposite ends of adjacent iron cores is the pole of the field NS. 2n of pitch
/ 3 (where n = 1, 2, 3,...). 4. A transfer device using the linear motor according to claim 1. 5. A feed bar driving device using the linear motor according to claim 1. 6. An armature fixed to a press frame,
The feed bar driving device according to claim 5, wherein the field is fixed to the feed bar.