JPS6216060A - Linear stepping motor - Google Patents

Abstract

PURPOSE:To reduce the end effect of a linear stepping motor, and to conduct smooth carrying at high speed by changing the shapes of teeth sections at both end sections of a secondary side plate for the linear stepping motor. CONSTITUTION:A linear stepping motor has a primary side core 1, a secondary side plate 2 and a primary side winding 3 wound on the primary side core 1. The width and height or either one of them of teeth sections for surfaces oppositely faced to the primary side core 1 at both end sections in the progressive direction of the secondary side plate 2 is reduced gradually. The shapes of teeth at the end sections of the secondary side plate 2 are altered, thus minimizing the end effect of the linear stepping motor, then reducing the generation of force decelerated of the secondary side plate 2 when the secondary side plate 2 is struck out by the primary side core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear step motor, and more particularly to a linear step motor that can perform smooth high-speed ta feed.

The secondary plate of the conventional linear step motor is the third
As shown in the figure, the width l of the teeth is the same in all parts.

I'm trying to make one. When the secondary plate is driven into cloud 2 by the primary magnetic core,
That is, when the end of the secondary plate passes through the primary magnetic core, a deceleration force is generated due to the so-called end effect of a linear step motor.

The present invention reduces the generation of force that is decelerated due to the end effect of the linear step motor when the end of the secondary plate of the linear step motor passes the primary magnetic core, and provides a linear step that allows smooth high-speed conveyance. The purpose is to provide motors.

The present invention provides a linear step motor comprising a primary magnetic core having a primary winding and a secondary plate, in which the primary side of the secondary plate is located at both ends of the secondary plate in the direction of movement. It is characterized in that the width and/or height of the mountain portion of the surface facing the magnetic core portion is reduced.

Tsumiko The present invention will be explained below based on the drawings.

In the linear step motor according to the present invention, the primary side portion may be of either a barrier pull reluctance type or a permanent magnet type. Figure 2 shows an example of a four-phase barrier pull reluctance type, in which 1 is the primary magnetic core, 2 is the secondary plate, 31, 32, 33, and 34.
indicates the primary winding.

In the following embodiments, an example of a four-phase barrier pull reluctance type shown in FIG. 2 will be explained.

FIG. 4 shows an example of a conventional linear motor, in which 1 indicates the primary magnetic core, 2 indicates the secondary plate, 3 indicates the primary winding, and P and N indicate the primary winding. Terminal 3 is shown. As shown in Fig. 3, the secondary side plate 2 of the conventional linear pulse smoke has the tooth width l, where p is the width of the teeth, d is the thickness of the teeth, and k is the height of the teeth. All parts of the throat have the same dimensions. For this reason, when the secondary plate 2 and the primary magnetic core 1 are driven out, that is, when the end of the secondary plate 2 passes through the primary magnetic core, the end effect of the linear step motor causes the secondary A decelerating force was generated on the side plate 2.

The thrust generated in this case is proportional to the tooth width.

In the cases shown in FIGS. 3 and 4, when the tooth thickness d is the same and the exciting current of the primary winding 3 is constant,
With k and n as constants, when the end of the secondary plate 2 approaches the primary +j, l magnetic core 1 and the teeth are in the position shown in FIG. The force generated against 2 is simply expressed by the equation shown in FIG.

As shown in FIG. 5, it can be seen that a force Fb that decelerates the secondary plate 2 is generated.

FIG. 1 shows an embodiment of the linear step motor according to the present invention, where ■ indicates the primary magnetic core, 2 indicates the secondary plate, 3 indicates the primary winding, and P and N indicate the primary winding. Terminals of side winding 3 are shown. The same parts as in Fig. 4 are indicated with the same reference numerals.

The embodiment shown in FIG. 1 shows a case where the width of the end of the secondary side plate 2 is reduced, and the shape of the end of the secondary side plate is the same as that shown in FIG. 6 (1). This figure shows a case in which the width of the secondary plate is reduced to a trapezoidal shape, and the height of the teeth at the end of the secondary plate shown in Fig. 6 (2) is reduced, and the shape of the end of the secondary plate is as follows. The width of the end shown in FIG. 6(1) is reduced, and the width of the end portion is reduced as shown in FIG. 6(3). Figure 6 (1) and (
A combination of 2) is possible. In the configuration shown in FIG. 6(2), the height of the teeth at the end of the secondary plate 2 is gradually lowered to reduce the air gap with the primary magnetic core 1 at the end of the secondary plate 2. It is designed to gradually increase in size. The shape of the secondary plate 2 is shown in FIG. 7 (1), and the AA' plane of the secondary plate 2 is shown in FIG. 7 (2) and (
A triangular shape or a semicircular shape as shown in 3) is also possible.

As described above, by changing the shape of the teeth at the end of the secondary plate 2, the end effect of the linear step motor can be reduced, and when the secondary plate 2 is driven by the primary magnetic core 1, the secondary The generation of forces that are decelerated by the side plates 2 can be reduced.

Furthermore, the end portion of the secondary plate 2 is not limited to the above-described embodiment, and of course, any shape can be used as long as it can reduce the end effect of other linear step motors.

Now, when the shape of the teeth of the secondary plate 2 is such that the dimensions of each part of the teeth are as shown in Fig. 8, when the excitation current of the primary winding 3 is kept constant, let k and , when the end of the secondary plate 2 approaches the primary magnetic core 1, the ninth
The force generated against the secondary plate 2 when each tooth is in the position shown in the figure is expressed simply by the equation shown in FIG. 5.

As shown in FIG. 9, Fb is the force that decelerates the secondary plate 2, respectively.

Next, a comparative explanation will be given regarding the deceleration force Fb in the case of the linear step motor of the present invention and the case of the conventional linear step motor.

Now, when the dimensions of each part of the teeth of the secondary plate having the shape according to the present invention as shown in FIG. An example of a comparison of the positional state of each tooth of the generated thrust when a conventional linear step motor is used with a secondary plate with a tooth width of 1 is applied to the equations shown in Figures 5 and 9, respectively. By doing so, the following (Table-1
).

As is clear from Table 1, the deceleration force Fb can be made smaller in the case of the linear step motor of the present invention than in the case of the conventional linear step.

Also, in the case shown in (Table-1), the constant =3, k'
-1, when the secondary plate is hammered out,
The positional state of each tooth part is shown in Figs. 5 and 9 (A) ~
In case (d), the change in the thrust of the secondary plate is the 10th
The result will be as shown in the figure. As is clear from FIG. 10, when the linear step motor according to the present invention is used, when the end of the secondary plate 2 approaches the primary magnetic core 1, that is, the state of the teeth in FIG. The force that decelerates the secondary plate 2 during punching is very small, and the secondary plate 2 can be smoothly removed from the primary magnetic core 1, allowing high-speed conveyance.

FIG. 11 shows an example of the speed characteristics of a carrier to which the secondary plate of the linear step motor according to the present invention is attached, where the curve op represents the state in which the carrier is accelerated, and the point P indicates the part where the secondary plate of the linear step motor escapes from the primary magnetic core.

After point P), it shows the coasting range of the general carriage until the next thrust is applied.

As is clear from FIG. 11, when using the linear step motor of the present invention, the speed of the IN carriage hardly decreases even at point P, so it is faster than when using the conventional linear step in the coasting range. Transportable.

Therefore, in the present invention, by changing the shape of the peaks at both ends of the secondary plate of the linear step motor, the end effect of the linear step motor is reduced, and the secondary plate decelerates when it passes the primary magnetic core. This can reduce the amount of force generated.

In this embodiment, a four-phase barrier pull reluctance type linear pulse smoke was explained, but it goes without saying that the present invention is not limited to this.

As explained in the embodiment, the effect of the present invention is to reduce the end effect of the linear step motor by simply changing the shape of the peaks at both ends of the secondary plate of the linear step motor. An object of the present invention is to provide a linear step motor that reduces the generation of force that slows down the next plate when it passes through the primary magnetic core, and allows smooth high-speed conveyance.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of a linear step motor according to the present invention, Fig. 2 shows an embodiment of a four-phase barrier pull reluctance type linear step motor, and Fig. 3 shows a conventional linear step motor. FIG. 4 is a diagram showing an example of an embodiment of a motor secondary side plate, FIG. 4 is a diagram showing an example of an embodiment of a conventional linear step motor, and FIG. 5 is a diagram showing the position of each tooth in a conventional linear pulse motor. FIGS. 6 and 7 are diagrams illustrating the force generated on the secondary plate when the linear step motor is in the form of peaks at both ends of the secondary plate of the linear step motor according to the present invention. FIG. 8 is a diagram showing the dimensions of each part of a tooth in an embodiment of the present invention, and FIG. 9 is a diagram showing the position of each tooth in an embodiment of the present invention.
Diagram explaining the force generated against the secondary plate, 1st
Figure 0 is a diagram showing the change in thrust when the secondary plate is driven out in the case of one embodiment of the present invention, and Figure 11 is a diagram showing a conveyance truck equipped with the secondary plate of the linear step motor according to the present invention. FIG. 3 is a diagram showing an example of speed characteristics. 1... Primary side magnetic core, 2... Secondary side plate, 3...
・Primary winding, 31.32.33.34...Primary winding. Patent Applicant Hitachi Kiden Kogyo Co., Ltd. Agent Patent Attorney Takao Ohnishi Fig. 1 2 Missing 41+Ii''f Figure 3 Figure 4 Figure 5 F (D) (D) 8SJf; Figure 8 Figure 9? (B) (K) Figure 10 → 1 of 4 sentences Figure 11 1 → Coin coin (S)

Claims (1)

[Claims] (1) In a linear step motor consisting of a primary magnetic core having a primary winding and a secondary plate, teeth on the surface facing the primary magnetic core at both ends of the secondary plate in the direction of movement A linear step motor characterized in that the width and/or height of the section are reduced.