JPS60160365A - 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 boundary of 2-phase adjacent phase belts of arbitrary phases shown in a rotary machine. CONSTITUTION:The coil of a linear motor is formed of upper and lower port coils 1, 2. The boundary of the coils 1, 2 of 2-phase adjacent 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.

[Prior art]

There was one shown in Figure 3. The figure shows a case where a two-pole, three-phase winding is applied, where (I) shows the upper end fill and (2) shows the lower end coil. In other words, Figure 1 (a) is a schematic diagram of the fez belt of a two-pole, three-phase, full-wound rotary machine that is the basis of the near motor; A schematic diagram of a phase belt. Similarly, (c) is a further developed diagram of a phase belt of a two-pole, three-phase, 11-near motor.

The structure of the winding shown in Fig. 1 (C) is shown in Fig. 2, and it is the same type of medium-sized 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 point T of this current is as shown in the same figure (b). , If we further integrate this and convert it into a diagram of the magnetomotive force distribution, we get the one shown in the same figure (c). As mentioned above, the magnetomotive force distribution is considerably distorted compared to the two-pole sinusoidal distribution, so the thrust characteristics The problem was that it was not very good.

[Summary of the invention]

This invention has been made to eliminate the above-mentioned drawbacks of the conventional motor, and aims to provide a linear motor whose thrust characteristics can be improved by changing the cut 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. The coil is cut open at the U-phase) and expanded as shown in the drawing (c) to form the fill of the linear motor.

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) is flowing through each phase, the instantaneous current distribution of each phase belt at point T will be as shown in the same figure (b), and The magnetomotive force distribution becomes the curve shown by the solid line in the same figure (c). This magnetomotive force distribution has a magnetomotive force waveform that is very close to a two-pole sinusoidal waveform. Therefore, good thrust characteristics can be obtained.

In the above embodiment, the case of a two-pole machine has been described, but it can also be applied to a four-pole machine or higher, although the effect will be 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 manner as the phase belts of any two adjacent phases of the phase belts shown in the rotating machine. Therefore, this has the effect of improving thrust characteristics.

[Brief explanation of drawings]

Figures 1 to 3 show the configuration and characteristics of a conventional motor.
(b) is a schematic diagram showing the upper and lower coils shown in (a) cut open, and (c) is a schematic diagram showing the expanded state of the coil shown in (b). Figure 3 (C) is a schematic diagram showing the coil insertion state, Figure 3 (A) is a current waveform diagram of each phase, Figure 3 (B) is an instantaneous current distribution diagram at point T in Figure 3 (A), and Figure 3 (A) is a diagram of the instantaneous current distribution at point T in Figure 3. ) is a magnetomotive force distribution diagram in the case of ←), and Figures 4 and 5 show the main parts of a linear motor according to an embodiment of the present invention.
, (c) are schematic diagrams corresponding to Fig. 1, and Fig. 5 (
(a), (b), and (c) are current waveforms, current distributions, and magnetomotive force distribution diagrams corresponding to FIG. 3. (11... Upper mouth coil, (2)... Lower eye coil, (
3)...Medium coil of turtle, (4)...Iron core. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 3

Claims (2)

[Claims] (1) In a linear motor configured by cutting a rotating machine and expanding it, the windings of the linear motor can be connected to any two adjacent phases of the fez belt shown in the rotating machine. This linear motor is characterized by cutting out the boundary between phase belts and having a structure similar to that developed by the above. (2) The linear motor according to claim 1, wherein the winding is arranged in two poles and three phases.