JPS60160364A - Linear motor - Google Patents

Abstract

PURPOSE:To improve the thrust characteristic by constructing the winding of a linear motor similarly to the cut and developed center of a phase belt of an arbitrary phase of phase belts shown in a rotary machine. CONSTITUTION:The coil of a linear motor is formed of upper and lower port coils 1, 2. The coils 1, 2 of phase belts of arbitrary phase are cut and developed to form the coil of the motor. When 3-phase sinusoidal currents are flowed to the coils of the phases, the distribution of the magnetomotive force approaches the sinusoidal waveform of two poles.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a linear motor constructed by cutting a rotary machine open and expanding it.

[American technology]

Figure 1 shows a conventional linear motor of this type in which phase windings are provided, where (1) shows the upper coil and (2) shows the lower coil. In other words, Figure 1 (G) is a schematic diagram of the phase belt of a two-pole, three-phase, full-wound rotary machine that is the basis of a linear motor, and (B) is a schematic diagram of the phase belt cut out between the upper and lower coils.・Schematic diagram of a phase belt shown in FIG.

The structure of the winding shown in Fig. 1 (c) is shown in Fig. 2, and it is the same type of tortoise shell coil (3
) is wound around the iron core (4), making it easy to manufacture the coil.

In the conventional linear motor configured as above,
The current in each phase is a three-phase sine wave alternating current as shown in Figure 3 (a), and the instantaneous current distribution in each phase belt at the T point of this radio wave is as shown in the same figure ←). Further, if this is integrated and converted into a diagram of the magnetomotive force distribution, the result will be as shown in Figure 09.

Since it is considerably distorted compared to cloth, it has the disadvantage of not having good thrust characteristics.

[Summary of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional motors, and aims to provide a linear motor whose thrust characteristics can be improved by changing the cut-out position of the coil.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a drawing corresponding to FIG. 1. In this invention, as shown in FIG. This is developed to form the coil of the near motor as shown in drawing (c).

Note that in this case, multiple types of coils are required.

The current, magnetomotive force, etc. of each phase in the device configured as described above will be explained. If a three-phase sinusoidal current as shown in Figure 5 (A) flows through each phase, the instantaneous current distribution of each phase belt at point T is as shown in Figure 5 (I:I).
The distribution of the magnetomotive force is as shown in the figure (c).
The curve (a) is shown as a solid line. This magnetomotive force waveform swings greatly to the right, but except for the rectangular wave that spans the entire length of the linear motor shown by the broken line (b), it is very similar to a two-pole sine waveform as shown by the dashed line (C) in the same figure. The waveform of the magnetomotive force is similar. This rectangular-wave magnetomotive force (indicated by the broken line) can be interpreted as an alternating magnetomotive force, so it has no effect on the thrust characteristics for a stationary secondary conductor. Therefore, a traveling magnetomotive force very similar to the bipolar sinusoidal waveform shown by the dashed line (C) acts on the stationary secondary conductor, so that good thrust characteristics can be obtained.

In the above embodiment, the case of a two-pole machine has been described, but it is possible to apply the present invention to a four-pole machine or more, although the effect is slightly smaller.

〔Effect of the invention〕

As described above, according to the present invention, the windings of the linear motor are constructed in the same way as the phase belt of any phase among the phase belts shown in a rotating machine, which is cut out and expanded at the center, so that the thrust characteristics are This has the effect of improving the

[Brief explanation of the drawing]

Figures 1 to 3 show the configuration and characteristics of conventional linear linear motors.
(b) Schematic diagram showing the upper fill and lower r: 3 coils cut open, as shown in (b) Bald), and (c) is a schematic diagram showing the expanded state of the coil shown in (b). Figure 2 is a schematic diagram showing the coil insertion state of the item shown in Figure 1 (C), and Figure 3 (A).
Similarly, (B) is the instantaneous current distribution diagram at point T in Figure (B), and (C) is the magnetomotive force distribution diagram for Figure (B). Figures 4 and 5 are This figure shows the main parts of a linear motor according to an embodiment of the present invention.
I2) (C) are schematic diagrams corresponding to Figure 1 and Figure 5, respectively.
The figures (A), (B), and (C) are current waveforms, current distributions, and magnetomotive force distribution diagrams corresponding to FIG. 3. Medium-sized coil, (4)...iron core. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In a linear motor constructed by cutting open a rotating machine and expanding it, the windings of the linear motor are
A linear motor characterized by having a structure similar to that of the face heald shown in the rotating machine described above, in which the center of a phase belt of an arbitrary phase is cut open and the belt is expanded. (2) The linear motor according to claim 1, wherein the winding is arranged in two poles and three phases.