JPS58108958A - Linear induction motor - Google Patents

Abstract

PURPOSE:To increase the thrust force over a wide range of a slip by forming the conductive unit of composite secondary conductors so as to enclose not only at the primary core side but both ends of magnetic units. CONSTITUTION:The conductive units 3 of secondary conductors are largely provided at both sides of a magnetic unit 4. The increase in the units 3 becomes equivalent to the widening of the secondary conductors, and the effective conductivity can be accordingly increased without forming thickly the secondary conductors, and the gap length may not substantially be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to linear induction motors, and more specifically to improvements in secondary conductors of linear induction motors.

Generally, it is desirable to use a material with high electrical conductivity and high magnetic permeability for the secondary conductor. However, in reality, there are no materials with such characteristics, so a material with high conductivity and a material with high magnetic permeability are bonded together to form a composite secondary conductor, which increases both the effective conductivity and effective magnetic permeability as a whole. There is.

Embodiments of the present invention will be described below based on the drawings. 1st
The figure shows the configuration of the main parts of a conventional linear induction motor. In the figure, 1 is the primary iron core, 2 is the toothless coil, 3 is the conductive part of the secondary conductor, and 4 is the magnetic field of the secondary conductor. Department.

In the structure of the conventional linear induction motor having the above-mentioned structure, there was a limit to the improvement of characteristics for reasons described below.

An object of the present invention is to provide a linear induction motor with improved characteristics.

A feature of the present invention is that the conductive portion of the composite secondary conductor is formed so as to surround not only the primary core side but also both sides of the magnetic portion.

Now, if the conductivity of the material used for the secondary conductor of a linear induction motor is C, the effective conductivity when a material with a diameter of σ11 is used for the conductive part of the secondary conductor is expressed as the following equation: expressed.

However, h is the primary core thickness, T is the pole pitch, and d is the secondary conductor width.

Therefore, in order to increase the effective conductivity of the secondary conductor, it is sufficient to increase the width of the conductive portion of the secondary conductor. However, for example, when a linear eye/duction motor is used in a vehicle, there are often restrictions on the width direction of the secondary conductor. Further, even if the width of the magnetic portion of the secondary conductor is made too wide, it will not contribute to improving the effective conductivity.

Next, the configuration of essential parts of an embodiment of the linear induction motor according to the present invention is shown in FIG. shall be. Based on the above fact, in this embodiment, as shown in the same figure, the conductive portions 3 of the secondary conductor are provided in a large size on both sides of the magnetic s4, so that the secondary conductor is widened by the amount that the conductive portions 3 are made large. Therefore, the effective conductivity can be increased without forming the secondary conductor thickly, and the gap length does not have to be substantially increased.

Figure 3 shows the timing characteristics of a linear induction motor in a conventional example (
A comparison will be made between 5) and this example (6). It can be seen from the figure that a large propulsion force can be obtained.

As explained above, in the present invention, the conductive portion of the composite secondary conductor is formed so as to surround not only the primary core side but also both sides of the magnetic portion, so that the characteristics of the linear induction motor can be improved according to the present invention.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the main parts of a conventional linear induction motor, FIG. 2 is a longitudinal sectional view showing the main parts of an embodiment of the linear induction motor according to the present invention, and FIG. 3 is a longitudinal sectional view showing the main parts of a linear induction motor according to the present invention. FIG. 4 is a 4I characteristic diagram showing the characteristics of the linear induction motor according to the present invention in comparison with a conventional example.

Claims (1)

[Claims] 1. In an IJ motor, the secondary conductor is equipped with a composite secondary conductor formed by joining a conductive part provided on the primary iron core side and a magnetic part provided on the opposite side of the primary iron core. 1. A two-way induction motor, characterized in that an end of the conductive part is formed so as to surround both sides of the magnetic part.