JPS6048987B2 - Inductor motor rotor - Google Patents

Description

Detailed Description of the Invention The present invention relates to a rotor for an inductor motor, and its purpose is to prevent rattling between permanent magnets and synthetic resin due to molding shrinkage, reduce motor noise, and extend service life. An object of the present invention is to provide a rotor for an inductor motor that can be made smaller and smaller.

7 and 8 show the rotor of a conventional inductor motor. In the conventional example shown in FIG. magnet 2
Since the structure is such that the rotor is sandwiched between the upper and lower parts, cracks tend to occur at the part A, and the thickness of the rotor becomes large. Furthermore, in the conventional example shown in FIG. 8, a protrusion 7 is provided on the inner circumference of the permanent magnet 2 to strengthen the engagement force between the permanent magnet 2 and the synthetic resin 5 in the vertical direction. During filling and molding, the synthetic resin 5 contracts in the directions of arrows A and B in FIG. 8, resulting in a gap between the permanent magnet 2 and the synthetic resin 5, resulting in looseness. The present invention was invented to solve the above-mentioned drawbacks, and one embodiment is shown in FIGS. 1 to 3. FIG. 1 shows an exploded perspective view of a one-way self-starting inductor motor, in which 2 is an annular permanent magnet having multi-pole magnetized rotor magnetic poles 1 on its outer circumference, and 6 is an inner circumference of permanent magnet 2. Synthetic resin filled in the part, 6
9 and 10 are upper and lower plates arranged to sandwich the excitation coil 112 from above and below; 8 are upper and lower base plates 9 and 1;
11 and 17 are upper and lower corner plates, 13 is a magnetic material that magnetically couples the upper and lower base plates 9 and 10, 15 is a pinion, 16 is a buffer member, 18 is a bearing. Figure 2 shows an enlarged sectional view of the rotor.
A notch 4 that opens toward the inner circumferential surface of the permanent magnet 2 is provided in opposing parts of the inner circumferential surface of the permanent magnet 2, and a notch 4 that is locked downward (in the axial direction of the permanent magnet) is provided in the notch 4. The recess 3 is recessed to form a hook 19 on the edge of the locking recess 3, which is hooked in the radial direction. Upon filling and molding, the synthetic resin 5 flows into the notch 4 and solidifies. During the solidification process, the synthetic resin 5 contracts in the direction of arrows A and B shown in FIG. 2 at the notch 4. Therefore, the synthetic resin 5 in the locking recess 3 becomes entangled with the hook portion 19 adjacent to the locking recess 3 and protruding upward, thereby strongly holding the permanent magnet 2 in its radial direction. The synthetic resin 5 is filled only in the inner peripheral part of the permanent magnet 2 so as not to protrude from the end face of the permanent magnet 2, and does not protrude to the upper and lower surfaces. Note that by forming a portion to which stress is applied due to contraction of the synthetic resin 5, for example, the surface of the hook portion 19, into a gentle curve, it is possible to prevent cracking when the synthetic resin 5 contracts. Further, as shown in FIG. 2, the notch 4 may be formed so that the locking recess 3 opens only on the upper inclined surface provided on the inner circumference of the permanent magnet 2. As shown in the figure, notches 4 may be formed in the upper and lower inclined surfaces, respectively, so that the locking recesses 3 open on the upper and lower sides. Furthermore, the notch 4 is a rotating body having the cross-sectional shape of FIG. 2 or 4, for example, as shown in FIG. Notches 5 and cutouts 4 having recesses 3 may be formed, and the number of cutouts 4 is not limited to the above embodiment. Furthermore, the notch 4 is a permanent magnet 2
The permanent magnet has a locking recess 3 recessed in the axial direction of the magnet, and the permanent magnet 2 has a locking recess 3 recessed in the circumferential direction. In this case, as shown in FIG. 6a, a notch 4 is provided at a suitable location on the inner circumferential surface of the permanent magnet 2, penetrating vertically (in the axial direction), and the permanent magnet 2 is provided on both sides of the notch 4. It is also possible to form a locking recess 3 recessed in the circumferential direction! Alternatively, as shown in FIG. 6b, the locking recess 3 recessed in the circumferential direction of the permanent magnet 2 may be formed only on one side of the notch 4 that can be penetrated in the vertical direction. The shape of the notch 4 may be a dovetail shape as in the embodiment shown in FIG. 3 or 5a, or a shape inclined to the rotor axis as in the embodiment shown in FIG. It may be of any shape. As described above, the present invention provides a notch in the inner peripheral surface of an annular permanent magnet, and a locking recess recessed in a direction perpendicular to the radial direction of the permanent magnet in the notch. A hook part is formed on the surface that acts as a hook in the radial direction,
Since the inner periphery of the permanent magnet is filled with synthetic resin, when the synthetic resin is injected into the inner periphery of the permanent magnet so that it does not protrude beyond the end face of the permanent magnet, the synthetic resin will fill in the recess of the notch. In the process of solidification of the synthetic resin as it flows in, the contraction of the synthetic resin increases the radial engagement force between the permanent magnet hook and the synthetic resin, preventing the rotor from rattling. This has the advantage that motor noise due to rotor rattling is eliminated, the life of the motor can be extended, and furthermore, miniaturization can be achieved since there is no need for a sandwich structure made of synthetic resin.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an inductor motor using an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the rotor of the above, and Fig. 3 is an enlarged plan view of the permanent magnets constituting the rotor of the above. ,
FIG. 4 is an enlarged sectional view of another embodiment of the rotor of the present invention, and FIG.
Figure A. An enlarged cross-sectional view and an enlarged plan view of a permanent magnet in another embodiment of the rotor of the present invention. Enlarged sectional view and enlarged plan view, A and C in Fig. 6b]! Furthermore, an enlarged sectional view and an enlarged plan view of the permanent magnet of still another embodiment of the rotor of the present invention, and FIGS. 7 and 8 are sectional views of the conventional example, respectively. 1 is a rotor magnetic pole, 2 is a permanent magnet, 3 is a locking recess, 4 is a notch, 5 is a synthetic resin, 6 is a rotating shaft, and 19 is a hook.

Claims (1)

[Scope of Claims] 1. Notches are provided at key points on the inner circumferential surface of an annular permanent magnet having multi-pole magnetized rotor magnetic poles on the outer circumferential surface, and a cutout is provided in the cutout in a direction perpendicular to the radial direction of the permanent magnet. A recessed locking recess is formed to form a radial catch on the inner circumferential surface of the permanent magnet, and the inner circumference of the permanent magnet is combined so that it does not protrude beyond the end surface of the permanent magnet. A rotor for an inductor motor, characterized by being filled with resin together with a rotating shaft. 2. The rotor of an inductor motor according to claim 1, wherein a locking recess is formed in the notch and is recessed in the circumferential direction of the permanent magnet. 3. A rotor for an inductor motor according to claim 1, characterized in that a locking recess is formed in the notch and is recessed in the axial direction of the permanent magnet.