JPS5935557A - Linear stepping motor - Google Patents

Abstract

PURPOSE:To readily and accurately form the width of a gap by enabling to adjust the size of the gap between the toothed part of a stator core in a linear step and the toothed part of a slider piece. CONSTITUTION:A housing 1 which holds the toothed part 2a of a stator core 2 to be capable of being exposed, and a carrier 7 which holds a slider piece 11 having a toothed part opposed to the toothed part 2a are provided. Any of the stator core 2 or the slider piece 11 is secured directly to the housing 1 or the carrier 7, while the other of them is secured through an adhesive resin filling layer 16 to the housing 1 or the carrier 7. In this manner, the thickness of the layer 16 is adjusted before the resin is hardened, thereby adjusting the size of the gap between the toothed part 2a and the toothed part of the piece 11.

Description

[Detailed Description of the Invention] C (D) The invention relates to a linear stepping motor, and more particularly, to a linear stepping motor that can adjust the thickness of the gap between the teeth of the stator core and the section a of the slider piece in a linear stepper. .

Conventionally, a slider piece is composed of a slider piece having a large number of teeth arranged side by side at an equal pitch on its surface, and a stator core having a tooth portion facing the slider piece and a coil for exciting the tooth portion. A linear stepping motor moves the support carrier of the slider piece relative to the support housing of the stator core by sequentially and alternately exciting each of the coils. This linear stepping motor has the advantage that the stator core on the coil side can be configured compactly no matter how long the housing and carrier are because the carrier and slider piece, which are movably mounted on the housing, move together. be. However, in this motor, it is very difficult to adjust the position of the gap between the teeth of the stator core that is assembled into the housing and the teeth of the slider piece that is assembled into the carrier. This is due to the fact that the gear width of both teeth is extremely narrow, for example, 10 to 5 degrees n, and the stator core and slider pieces on which these teeth are formed, as well as the housing and carrier that support them, have been processed. This is mainly due to inevitable variations in accuracy.

This invention was made in view of the above points, and
The object is to provide a linear stepping motor in which the width of the gear tooth formed by the teeth of the stator core and slider piece described above can be easily and precisely formed.

The invention will be explained below with reference to an embodiment shown in the drawings.

In Figure 1, No. 1 is the fixed side of the motor.
A stator storage hole 4 is provided in which the stator core 2 and the coil 3 wound around the stator core are stored and fixed. A stator core 2 is fixed in the storage hole 4 with its teeth 2a projecting slightly beyond the upper surface of the housing l.

-10,000, A pair of slider pieces IQ, 1 are fixed in advance to the carrier 7, which is the movable side of the motor, with a permanent magnet 9 in between.
A U-shaped storage groove 8 is provided for storing and fixing 1. 1. In the center of this gear 9a, there is an injection hole 7 for injecting adhesive resin for bonding the slider pieces, which will be described later.
A is pierced.

This injection hole 7a communicates with the storage groove Svc. Note that these housings 1 and the carrier 7 are the teeth 2a of the stator core 2 and the teeth g10a of the slider piece 10.11.
, lla are arranged facing each other. The stator core 2 is stored and fixed in advance in the housing JL4 of the housing 1. The /S shushing 1 and the carrier are arranged facing each other with a predetermined gap maintained by a plurality of balls 5 arranged in the V-grooves 6 and J2 formed respectively through the retainer 13. ing.

The slider pieces 10.11 are fixed to the carrier 7 in a state where the carrier 7 is placed on the rod suspension 1 via the balls 5.

That is, as shown in FIG. 2, for example, the spacer 15 is first placed on the toothed portion 2a of the stator core 2 that has been fixed in advance to the storage hole 4 of the housing 1. Note that the thickness of this spacer 15 is equal to that of the tooth portion 2a of the stator core.
and the teeth of the slider piece that will be fixed from now on] Oa +
] The width G is set in advance to be equal to the width G formed by V7.

-10,000 The slider piece 10.11 is stored in the U-shaped storage groove 8 of the carrier 7 with its teeth m10a, lla facing the teeth f4M2aK of the stator core 2 via the spacer ]5. Next, adhesive fixing resin 17 is injected into the adhesive resin injection layer 16 formed by the storage groove 8 and the back side of the slider piece 10.11 stored in the storage groove 8 through the injection hole 7a. .

By injecting the resin 17, the teeth of the slider piece come into close contact with the spacer 15, and the gear tooth width with the teeth of the stator core is accurately ensured.

The slider piece is accurately fixed in the storage groove 8 of the carrier 7 as the injected resin solidifies while the gear knob G is maintained. Note that the spacer J5 is removed after the slider is securely fixed to the carrier 7.

By the way, the teeth 10a, lla of the slider piece 10.11
As shown in FIG. 3, they are formed at the same pitch, and a 380° phase shift is maintained between them.

In the stator core 2, two stator cores, front and rear, are arranged along the longitudinal direction (movement direction) of the slider piece 10.11, and each core is formed with a pair of teeth. Each of these four tooth portions has a 18-18 mm diameter between each pair of tooth portions of each stator core.
A phase shift of 0° is provided, and a 90° phase shift is provided between each tooth portion of each stator core. Note that these two stator cores are each integrally connected by a non-magnetic connecting plate 14.

The motor configured as described above alternately energizes each coil 3 of each stator core 2 so that each core 2
By alternately exciting the tooth portions 2a of each core and the tooth portions 10a, lla, ! of the slider piece. : Due to the phase shift, the carrier 7 moves relative to the housing l by a distance corresponding to 1/4 of the pitch of each tooth part, while stepping.

FIG. 4 is a diagram for explaining the operation of the carrier 7. In this figure, in order to make the structure easier to understand, the teeth of each stator core 2 are shown grouped into one tooth. f, the permanent magnet 9 is magnetized to the N pole and the S pole in parallel to the traveling direction of the carrier 7. As a result, in FIG. The slider pieces 10 are each magnetized to the S pole.

Therefore, Fig. 4 (in aJVc, with respect to the coil 3b of the lower core 2-B, the -1000 tooth portion 2a3 is the S pole, and the other side)
When electricity is applied so that the toothed portion 2a4 becomes the N pole and only the core 2-B is excited, the toothed portion 11a5 of the left slider piece 11 becomes the toothed portion 2a3, and the toothed portion 10a6 of the right slider piece 10 becomes the toothed portion. 2a4, both slider pieces move upward by 1/4 pitch of each tooth, and as shown in FIG.
) Reach the position indicated by VC. In addition, at this time, the left tooth part] 1a6, the core tooth part 2a4, and the right tooth part 10a4
Since the core tooth portions 2a3 and 2a3 have the same polarity and repel each other, movement of the slider piece (carrier) is promoted. However, at this time, the other core 2-A is not excited, so it is not involved in the movement of the carrier 1j.

Next, in FIG. 4 (bl), when the coil 3aK of the upper core 2-A is energized and the -10,000 tooth 2al is excited to the N pole and the other tooth 2a2 to the S pole, the teeth 10a2 and 11a4 The teeth 2al and 2a2vc are each attracted, and the slider pieces move further upward by 1/4 pitch.As a result, each slider piece that has moved to the position shown in FIG. When the coil 3.b is energized and the toothed portion 2a3 is excited to the north pole and the toothed portion 2a4 is excited to the south pole, the tooth gB 10
a5 and 11a7 are attracted to the teeth 2a3 and 2a4, respectively, and the slider piece further moves by 1/4 pitch, reaching the position shown in FIG. 4 (dl). In this state, turn the upper coil 3 again.
When power is applied to the tooth part 2al and 2a2 is excited to the north pole, the slider piece further moves upward by [1/4 pitch], as shown in Fig. 4 (fe). , the slider piece reaches a position moved by one pitch. Therefore, as described above, by alternately exciting each stator core, the slider piece can be stepped and the carrier 7 can be moved.

The above-mentioned linear stepping motor is applied, for example, to a drive source for stepping a set meal head of a video disc.

By the way, as mentioned above, in the linear stepping motor according to the present invention, the adhesive resin injection layer J6 is formed between the storage groove 8 of the carrier 7 in which the slider piece is stored and fixed, and the back surface of the slider piece. It is configured as follows. Therefore, even if the gear tooth width GK between the teeth of the stator core and the teeth of the slider piece is slightly changed, the spacer 1
By simply changing the thickness of the gear knob 5, the dimensional difference is absorbed by the injection layer J6, and an accurate gear knob can be ensured. In addition, this adhesive resin injection layer 16 also functions to absorb the unavoidable variations and deviations in machining of the stator core, slider pieces, housing, carrier, etc. The gap G becomes extremely accurate.

In the above embodiment, an example was shown in which the stator core housing was fixed in advance and an adhesive resin injection layer was provided between the carrier and the slider piece. It may also be formed between. Alternatively, the stator core may be stored and fixed on the carrier side, and the slider pieces may be stored and fixed on the housing side.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1 viewed from the carrier movement direction, and FIG. 3 is a side view of FIG. 1 viewed from the side along the carrier movement direction. FIG. 4 is an enlarged sectional view of the main part, and is an explanatory diagram of the operation of the above embodiment. J...Housing, 2...Stator core, 2a...
・Tooth portion, 7...Carrier, 7a...Resin injection hole, 8
...Storage groove, 1O211...Slider piece, 10a+
lla... tooth part, 14... smoother, J6...
-Adhesive resin injection layer, 17...Adhesive resin. (C) See 4 (e2 (dn)

Claims (1)

[Claims] A linear stepper comprising a housing for holding the teeth of the stator core in an exposed manner and a carrier for holding a slider piece having teeth facing the teeth of the stator core, wherein the stator core, l or the slider Either one of the stator core or slider pieces is fixed directly to the housing or the carrier, or the other of the stator core or slider pieces is fixed to the housing or the carrier via an adhesive resin injection layer, whereby the same resin injection layer is fixed. A linear stepping motor characterized in that the size of the gear between the teeth of the stator core and the slider piece is adjusted by adjusting the thickness of the stator core before it solidifies.