JPS6322143B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotor for a flat motor.

FIG. 1 shows a conventional rotor of this kind, in which a substantially fan-shaped segment coil is constructed by stacking a pair of front and back segment coil portions each with half the number of turns.Segment coils 1d, 1
e and 1f are arranged on the same plane with a distribution angle of 120°, the winding start terminal wires of each pair of front and back segment coil parts are connected with solder 2, etc., and the commutator piece is held with molded product 4d. The rotor shaft 3 is press-fitted into the center of the cylindrical commutator 4', and these segment coils 1 are
d, 1e, 1f, rotor shaft 3, and cylindrical commutator 4' are simply fixed together with a molding material 5, such as molding resin or adhesive.

However, according to this, the segment coil 1d,
1e and 1f are integrated in a plan view by the molding material 5, but the fixing strength in the direction along the rotor axis 3 is weak, and each segment coil 1d, 1
There was a drawback that e and 1f were easily dislodged by the force applied in the above direction, making it unsuitable for mass production.

Further, since the rotor shaft 3 is simply press-fitted into the cylindrical commutator 4', the effect of preventing rotation of the rotor shaft 3 is insufficient.

The present invention has been proposed in view of the above-mentioned points, and its purpose is to provide three segment coils in which the front and back segment coil portions are arranged in a manner slightly shifted around the rotor axis. The cylindrical commutator is arranged on the same plane with a slight interval from each other, and a locking part is provided on the outer periphery of the rotor shaft facing the cylindrical commutator, and a molding material is overlapped on a part of each segment coil part, and By distributing the molding material so as to surround each segment coil and simultaneously introducing the molding material between the rotor shaft and the cylindrical commutator, each segment coil, the rotor shaft, and the cylindrical commutator are bonded to each other. It is an object of the present invention to provide a rotor for a flat motor with further improved fixing strength.

The present invention will be explained below with reference to the drawings.

In FIG. 2, 1a, 1b, and 1c indicate segment coils, and each of these segment coils 1a, 1b, and 1c is flat and approximately fan-shaped in plan, with the number of turns being 1/2 on the front and back sides of the rotor. It is composed of segment coil parts 1a' and 1a", 1b' and 1b", and 1c' and 1c" whose angles are smaller than 120 degrees.Each segment coil part 1a' and 1a", 1b' and 1
b″, 1c′ and 1c″ are respectively arranged around the rotor shaft 3 at an angle γ, and the winding start terminal wires of the front and back segment coil parts are connected with solder 2. .

Further, the segment coil parts 1a', 1b', 1c' and 1a'', 1b'', 1c'' are arranged around the rotor shaft 3 on the front and back sides of the rotor, respectively, with gaps indicated by an angle β. , the relationship α+β=120° is maintained, where α is the distribution angle of each segment coil portion.

In the center of the rotor, segment coils 1a,
Flange portion 4 provided on the same plane as 1b and 1c
a', and a cylindrical part 4a'' which is connected to the flange part 4a' and whose inner diameter is larger than the rotor shaft 3, is provided. The commutator pieces 6 are fixed by integral molding,
A cylindrical commutator 4 is constituted by the molded product 4a and the commutator pieces 6. Note that the rotor shaft 3
At a position facing the cylindrical portion 4a'' of the molded product 4a, a recessed locking portion 3a is formed by knurling, etc., as shown in FIG. 2B and D. A plurality of radial grooves 7 are provided on the bottom surface of the rotor 4a, as shown in FIG. .

To assemble this, after arranging each segment coil 1a, 1b, 1c, cylindrical commutator 4, and rotor shaft 3 at the positions shown in FIG. When a molding material 5 such as a resin or an adhesive is poured, the molding material 5 forms the segment coil portions 1a', 1b', 1c' and 1c', including the gaps indicated by angles β, as shown in FIGS. 2A and 2C. A cylindrical commutator is filled in the space formed between each of 1a'', 1b'', and 1c'' and extends so as to overlap a part of each segment coil portion, as shown in FIG. 2B and D. The gap between the cylindrical part 4a'' of the molded product 4a and the rotor shaft 3 is also filled through the groove part 7 on the bottom surface of the rotor shaft 3.
It also enters into the recessed locking portion 3a. In this way, segment coils 1a, 1b, 1
c. The cylindrical commutator 4 and the rotor shaft 3 are integrally molded and fixed using a molding material 5 to form a rotor according to the present invention.

As described above, according to the present invention, three segment coils each having a pair of front and back segment coil portions slightly shifted around the rotor axis are arranged on the same plane with a slight interval from each other. A locking part is provided on the outer periphery of the rotor shaft facing the cylindrical commutator, and a molding material is superimposed on a part of each segment coil part, and the molding material is filled so as to surround each segment coil. At the same time, since the molding material is simultaneously introduced into the space between the rotor shaft and the cylindrical commutator through the groove formed in the cylindrical commutator, the circumference of each segment coil portion is The rotor is fixed by the molding material so as to be surrounded by it, and the molding material superimposed in the rotor axial direction increases the fixing strength in the rotor axial direction, and the rotor shaft itself is also firmly held by the molding material. A sufficient anti-rotation effect can be obtained,
The integral bonding force of the segment coil, cylindrical commutator, and rotor shaft is further strengthened, making it suitable for mass production.
This has the effect that a highly reliable rotor can provide.

[Brief explanation of the drawing]

Fig. 1 shows a conventional rotor, in which A is a plan view, B is a half sectional view taken along line A-A in I, and Fig. 1 shows a conventional rotor.
Figure 2 shows an embodiment of the present invention, in which Figure A is a plan view, Figure B is a sectional view taken along line B-O in Figure A, Figure C is a bottom view, and Figure D is a Figure C. It is a C-O sectional view. 1a, 1b, 1c...Segment coil, 1
a', 1a'', 1b', 1b'', 1c', 1c''...Segment coil part, 2...Solder, 3...Rotor shaft, 3
a... Locking part, 4... Cylindrical commutator, 4a... Molded product, 4a'... Flange part, 4a''... Cylindrical part, 5...
...Molding material, 6...Commutator piece, 7...Groove portion.

Claims (1)

[Claims] 1. Three flat segment coil parts with a distribution angle smaller than 120° are arranged on the same plane with a slight gap between each other around the rotor shaft, and these are placed on the back surface of the segment coil part. Three flat segment coil parts connected to each segment coil part to constitute three segment coils are arranged on the same plane with a slight gap between each other and slightly shifted from the segment coil part on the surface. At the same time, a cylindrical commutator is disposed coaxially with a slight gap around the rotor shaft, and a groove portion is provided in the cylindrical commutator to communicate with the rotor shaft side and the space between the segment coils. A locking portion is provided on the outer periphery of the rotor shaft facing the cylindrical commutator, and a molding material is provided between the segment coil portions, the groove portion, and the gap between the cylindrical commutator and the rotor shaft. A flat motor rotor characterized by being filled with.