JPS60183961A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To produce an arbitrary position detection signal by forming teeth grooves which do not become a power source when a linear pulse motor moves on a stator, thereby reducing the number of parts as a sensor, and eliminating the relative position matching between the stator and the sensor. CONSTITUTION:A sensor 13 is disposed to recognize teeth grooves 14 of a force generating side between a movable element 10 and a stator 9, and teeth grooves 12 at the back side of a stator 9. The sensor 13 is mounted on the element 10 by a bridge beam 11. In this case, the grooves 12 do not entirely contribute to the magnetic force for inducing the relative motion between the element 10 and the stator 9, and can be accordingly formed in an arbitrary shape.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a linear pulse motor.

<Prior art and problems> Conventional linear pulse smoke detects the thrust or holding force between the mover and stator on the stator of a linear pulse motor, for example, when detecting the relative position between the mover and stator. The teeth and grooves of the part that generates the elements (light, magnetism)
There are known methods that can detect this. To explain this with reference to FIGS. 1 and 2, the groove portion 4 of the stator 1
The tooth groove 6 of the mover 2 is installed with a certain gap between the tooth groove 6 and the tooth groove 6.
Due to the electromagnetic force generated between and 4, mover 2 and stator l have relative luck! For a linear pulse motor that moves 1lIJ't-, the relative position of the mover 2 and the stator lr is detected by reading the unevenness of the tooth space 4 of the stator 1 with a sensor 5 attached to the mover 2. There is. FIG. 2 shows an example of a stator in such a case. The stator l has grooves 7 and teeth 8 arranged at a constant interval P.
The sensor 5 recognizes this tooth groove 6 by holding it alternately.

However, in such a linear pulse motor, the output signal from the sensor 5 is determined by the pinch of the tooth space 6 of the stator l, and in order to obtain an even finer signal, it is necessary to increase the number of sensors 5. Alternatively, it becomes necessary to subdivide the output signal into circuits. In addition, in general, the amount of feed per step of a linear pulse motor is almost uniquely determined by the situation in which the linear pulse motor is used, and the pitch of the tooth spaces 6 of the stator 11 is determined based on this, so the output signal There were problems such as the pitch of the pitch being automatically determined. In addition to the above example, there are also known models equipped with a scale-like sensor for detecting relative positions in addition to the configuration as a linear pulse motor, but this requires an increase in the number of parts for the sensor, and There was a problem in that relative positioning between the child and the senna was required.

<Object of the Invention> The object of the present invention is to provide a linear pulse motor that has a small number of parts as a sensor, does not require relative positioning between a stator and a sensor, and can take out any position detection number 45. There is a particular thing.

<Structure of the Invention> The linear pulse motor of the present invention includes a stator in which teeth and grooves are alternately formed with a constant pinch in the length direction, and a plurality of moving child teeth facing the teeth of the stator. A linear pulse motor includes a movable element that moves in the length direction while maintaining a predetermined distance from the stator by passing through a built-in movable winding. By configuring the stator to have a tooth groove that is used only for detecting the relative position between the mover and the stator without being involved in the generation of the holding force or the force for movement between the mover and the stator, the above-mentioned It solves the conventional problems.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 3 to 5. That is, in this embodiment, as shown in FIG. 3, the tooth groove L4 on the force generation side between the mover 10 and the stator 9 is recognized as the tooth groove 12 on the back side with respect to the stator 9 (see FIG. 4). The sensor 13 is arranged to The sensor [3 is attached to the mover 10 using the bridge 11. At this time, since the tooth grooves 12 are not involved in any magnetic force that induces relative motion between the mover 10 and the stator 9, it is possible to form them into any desired shape. In Fig. 4, the pitches P2 and Pl of the tooth groove portions 12 and 14 are drawn to be the same, but it is not necessary that PJ=Pz, and if necessary, P2 can be made much smaller than Pl by δ. However, it is possible to improve the resolution of the position detection of the sensor 13.

In addition, as shown in FIG. 5, 1 (4 parts 15 are formed on the stator 9 in a binary bang shape, and 17a, 17b, L are formed on each pattern.
7c.

By arranging a sensor at 17d..., it is also possible to directly read the relative position of the mover on the stator.

Furthermore, the detection tooth groove and the force generating tooth groove do not need to be located on the back side of each other, but may be arranged on the same plane, which will be explained with reference to another embodiment shown in FIG. That is,
In this embodiment, on the identifier 18, the tooth grooves 21 that contribute to force generation with the mover 19 and the tooth grooves 22 that contribute to position detection are formed in the same plane. A center section 20 built into the mover 19 runs along the second part of the tooth groove 22.

By selecting one of the above embodiments depending on the intended use of the motor, it is possible to use the mounting space efficiently.

<Effects of the Invention> As explained above, the linear pulse smoke of the present invention has tooth grooves formed on the stator that do not serve as a power source during the movement of the linear pulse motor, so it is different from the conventional scale-shaped Compared to the case of using a sensor, the number of parts for the sensor is reduced, there is no need for relative positioning between the stator and the sensor, and the thrust or holding force between the mover and the stator can be reduced on the stator. Compared to the case where the generated tooth groove is detected by a frozen element, there is an advantage that an arbitrary position detection signal can be extracted.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional linear pulse motor; Fig. 2 is a partially enlarged view of the tooth groove portion in Fig. 1; the upper side is a plan view, and the lower side is a 19r side view; Fig. 3 is a diagram showing the present invention. Figure 4 is an enlarged partial view of the stator in Figure 3, and Figure 5 is a plan view showing a modified example of the tooth space. , FIG. 6 is a perspective view of a linear pulse motor showing another embodiment. 9.18... Stator 10 , 19... Mover 12
, 22...Tooth groove 14 for position detection, 21...Tooth groove 15 for force generation...? ^p 16... Applicant: Nippon Tonkei Co., Ltd.

Claims (1)

[Claims] A stator in which teeth and 11 values are alternately formed at a constant pitch in the length direction, and a built-in mover winding that has a number of mover teeth of '4I facing the teeth of the stator is energized. In a linear pulse smoke equipped with the stator and a movable element that moves in the length direction while maintaining a predetermined distance, the linear pulse smoker is involved in generating a holding force or force for movement between the movable element and the stator. This linear pulse motor is patented in that a tooth groove is formed on the stator, which only detects the relative position iC between the mover and the stator.