JPH04255439A - Radial type rotor structure - Google Patents

Abstract

PURPOSE:To facilitate assembling of a rotor by integrally forming rotor cores of one polarity. CONSTITUTION:Arms 13 are provided radially with an interval of 90 deg. for a ring part 11 having a central hole 11a and thin plate elements punched from a single electromagnetic steel plate are laminated so that fan type parts are formed at the end thereof thus constituting a rotor core 12 for single pole of the fan type part. A rotor core 14 constituted of a laminate of fan type thin electromagnetic mesh plate constituting another field pole through a magnet 24 is arranged between the rotor cores 12. Outer periphery 11b of a ring part 11 for integrating four rotor cores 12 is separated from the inner periphery 14a of the other pole rotor core 14 so that they are isolated magnetically. According to the constitution, structural strength of the rotor is enhanced, fixing accuracy with respect to the shaft is improved, number of parts is reduced, and assembling work of rotor is facilitated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a so-called radial rotor, in which each magnet is held between a rotor core.

0002

2. Description of the Related Art The structure of a conventional radial type rotor will be explained with reference to FIGS. 3 and 4. Each rotor core 14 formed by stacking sector-shaped thin plates is arranged in parallel with magnets 24 alternately in the circumferential direction. Each rotor core 14 is fixed to end plates 20 at both ends via connecting rods 16. On the other hand, the shaft 10 is separated from the inner circumference 14a of each rotor core 14 and is fixed to the end plate 20. Reference number 2
2 is a fastening ring member for fixing the end plate 20 and the shaft 10. That is, the rotor's rotational force is transmitted to the shaft 10 only through the end plates, and the position of each rotor core 14 with respect to the shaft 10 is determined through the end plates 20.

0003

Since the conventional rotor has the above-described structure, the structural strength of the rotor as a whole is insufficient, and it is necessary to design the end plate in consideration of the transmission of rotational force. Furthermore, since the positional accuracy of the rotor core with respect to the shaft depends on the method of attachment to the end plate, the accuracy of the end plate itself, and the assembly accuracy of the end plate and shaft, manufacturing the rotor is not necessarily easy. Assembly work is also complicated due to the large number of parts.

Therefore, the present invention increases the structural strength of the rotor,
The purpose of the present invention is to provide a radial type rotor structure that increases the accuracy of the mounting position on the shaft, reduces the number of parts, and facilitates rotor assembly.

[0005]

[Means for Solving the Problems] In view of the above object, the present invention is a radial type rotor in which a magnet is held between a rotor core, and is characterized in that one rotor core of the same polarity is integrally formed. Provides a radial type rotor structure.

[0006]

[Operation] Even if the N-pole or S-pole rotor cores are integrated, no problem will occur because their magnetic potentials are originally the same. Therefore, the rotor core of either pole can be formed integrally, which improves the strength of the rotor and reduces the number of parts.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the accompanying drawings. Referring to FIGS. 1 and 2, arm portions 13 are provided in the radial direction at 90 degree intervals with respect to a ring portion 11 having a center hole 11a, and a piece of electromagnetic wire is further provided with a fan-shaped portion at the tip. Thin plate elements stamped from plates are laminated to form one pole (in this example, N
The rotor core 12 of the A rotor core 14 in which fan-shaped thin electromagnetic steel plates are laminated between each rotor core 12 and constitute a field pole of the other pole (S pole) via a magnet 24.
is installed.

The outer periphery 11b of the ring portion 11 that integrates the four rotor cores 12 described above and the inner periphery 14a of the other rotor core 14 described above are separated from each other to the extent that they are magnetically insulated. In other words, the rotor structure of the present invention shown in FIG. 1 has one pole (N pole) of the conventional rotor shown in FIG.
Only the ring portion 11 and the arm portion 13 are integrally formed. With this configuration, the structural strength of the rotor is improved, the number of parts is reduced, and the rotor can be assembled easily and with high precision.

In order to fix the above-mentioned rotor to the shaft 10, the above-mentioned center hole 11a is formed to a size that allows the rotor to be shrink-fitted to the outer diameter of the shaft 10. As a result, the position of the N-pole rotor core 12 with respect to the shaft 10 is set accurately, and an end plate is not required. Furthermore, although the S-pole rotor core 14 is not directly attached to the shaft 10, it is positioned relative to the N-pole rotor core 12, which is located at an accurate position with respect to the shaft 10, so its attachment accuracy is high. That is, the respective thin plate elements are integrally stacked together by the connecting rod 16, and the rotor core 14 of the south pole is connected to the north pole by the ring member 18.
It is fixed to the rotor core 12 of the pole.

0010

As is clear from the above description, according to the present invention, the structural strength of the rotor is improved, the accuracy of attachment to the shaft is improved, the number of parts is reduced, and the rotor can be assembled easily.

[Brief explanation of the drawing]

FIG. 1 is a front view of a rotor structure according to the present invention.

FIG. 2 is a sectional view taken along the arrow line II-II in FIG. 1;

FIG. 3 is a front view of a conventional rotor structure.

FIG. 4 is a longitudinal sectional view taken along the arrow line IV-IV in FIG. 3;

[Explanation of symbols]

10...shaft 11...Ring part 12...N pole rotor core 13...Arm part 14...S pole rotor core

Claims (2)

[Claims] 1. A radial type rotor structure in which a magnet is held between a rotor core, and one rotor core of the same polarity is integrally formed. 2. The radial type rotor structure according to claim 1, wherein one of the integrally formed homopolar rotor cores is provided with a center hole, and the center hole and the shaft are tightly fitted.