JPS6012869B2 - Slotless type electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in slotless electric motors.

Slotless type electric motors have less cogging or torque ripple caused by the iron core slot and can rotate smoothly, but on the other hand, compared to conventional slot type electric motors, they generate less torque and are insufficient in terms of compactness and high performance. There was a drawback. The present invention provides a high-performance slotless electric motor that is small in size but generates large torque, has little torque ripple, and can rotate smoothly.

In particular, when applied to a cylinder type slotless non-commutator motor, the effect is remarkable. Therefore, as an embodiment of the present invention, a magnet internal rotor type cylindrical slotless non-commutator motor will be described below based on Figs. 1 to 6. explain. Generally, the generated torque increases by increasing the number of windings (the number of turns), so increasing the winding area is effective in terms of the generated torque. Therefore, the present invention provides a plurality of armature wires 1, 1' on the inner circumferential surface of the armature core 2 so that the armature wire ring surface interlinked with the magnetic flux has a cylindrical curved surface.
(m is an integer of 3 or more) arranged in a phase arrangement, and the armature core 2 is provided at the outermost periphery so as to form the outer iron frame of the motor. This armature core 2 serves not only as a path for magnetic flux to generate torque and as an outer steel frame that makes up the exterior of the motor, but also as a shield for magnetic noise generated inside the motor. . The outermost armature core 2 can be easily manufactured by drawing a magnetic sheet metal.
The iron loss that becomes a problem in the outermost armature core 2 depends on the number of rotations, the number of magnetic poles, the number of magnetic fluxes, the dimensions of the motor, etc., but the thickness of the armature iron 2 is set to 1 to 3 skins. Then the rotation speed will be 100 ratio. p. m. Experiments have shown that there is almost no problem when used below this level. The possible winding area of the multiple armature wires 1, 1 arranged on the inner peripheral surface of the armature iron 02 made of such thin sheet metal is the armature wire 1.
71' is increased by increasing the diameter thereof, and therefore the number of windings (number of turns) can be increased and the generated torque can be increased. The arrangement method on the inner peripheral surface of the armature core 2 in Armature wire theory 1, 1' is to apply adhesive (
It is also possible to apply epoxy resin or the like and use some kind of jig to fix a plurality of armature wire rings 1, 1' at equal intervals, but as shown in Fig. 2, armature core 2 Arrange armature wires 1 at equal intervals on the inner circumferential surface of the armature, insert a resin molding jig 3, and after insertion, pour thermoplastic resin 4 between the armature core 2 and the resin molding jig 3, When the resin molding jig 3 is removed after fixing, an armature in which the armature wire 1 and the armature core 2 are integrated can be easily manufactured by the above method. Since the armature is installed at the outer diameter end of the motor in this way, a space may be created inside the motor.By using this space for the speed detection mechanism, a high-performance motor whose rotational speed is controlled to a predetermined speed is created. can be provided. Generally, the speed detection mechanism is
There are methods that use the generated voltage and methods that use the frequency of the generated voltage (frequency generator).Here, as an example, we will explain the latter method, which is a method in which a frequency generator is added, as shown in Figures 3 and 4. This will be explained in the figure. Armature coil 1
. The magnetic rotor 6 provided on the outer periphery and fixed to the rotating shaft 7 and the position detecting rotor 8 of the position detecting means constitute a rotor. A stator part constituting a frequency generator and a stator part for position detection of a position detection means are mounted on a housing 9 at opposing parts of the internal teeth of the magnetic rotor 6 and the position detection rotor 8, respectively. ing. FIG. 4 shows a schematic diagram of a stator section of a frequency generator which is a component of the present invention. Between the magnetic annular plates 10 and 11 having teeth on the outer periphery, an annular permanent magnet 12 magnetized to N and S poles with respect to the upper and lower sides and a signal wire ring 13 are provided, and the inner periphery of the magnetic rotor 6 is A frequency output corresponding to the number of revolutions is obtained in the signal wire ring 13 by the change in the flow of magnetic velocity caused by the teeth provided on the shaft, and the speed of the motor is controlled using this output. The signal line 13 of such a frequency generator tends to generate harmful noise due to electromagnetic transfer from the armature lines 1, 1' that drive the motor, but in the present invention, the armature lines 1, 1' By installing and isolating the wire near the outer end of the motor, the structure is such that it is less susceptible to the noise generated from the armature wires 1 and 1', and therefore the signal wire of the frequency generator There is almost no coupling between Theory 13 and Armature Ray Theory 1, 1'. FIG. 5 shows a schematic diagram of the position detection stator section. In this embodiment, the principle of rotation of the commutatorless motor as a position signal means is that the oscillation signal of an oscillator is sequentially detected by a non-contact method using electromagnetic induction by changing the position of an annular permanent magnet having a plurality of magnetic poles. Although not shown in the drawings, the signal operates a non-contact switching circuit to sequentially supply current to the armature coils, sequentially generate torque, and rotate the permanent magnet in a fixed direction. 6A and B are front views showing the shape of the armature wire used in the present invention, C and D are respective plan views, and the armature wire theory 1' shown in A and C is a predetermined radius of curvature. R, but B, D
The armature wire ring 1 shown in FIG. 1 has one lateral armature wire group wound on a straight line to reduce the direct current resistance of the lateral armature wire group and to have a highly efficient shape. By using such an armature coil, the generated torque can be further increased. The effects of the present invention are summarized as follows.

1. Since the armature wire group consisting of multiple armature wire rings can be placed near the outer peripheral edge, its outer diameter is maximized and the winding area is large, so the generated torque can be increased. .

2. Since the iron core, which serves as a path for magnetic flux to generate torque, and the outer steel frame, which constitutes the exterior part of the motor, are shared, the number of parts and manufacturing man-hours are reduced, thereby providing a low-cost electric motor. be able to.

3 By arranging the armature coils 1 and 1' that generate torque almost near the outer diameter of the motor, it is possible to have a frequency generator side inside, and also to connect the frequency generator's feed line and the armature coil's magnetic field. The magnetic rotor 6 can be designed compactly since the magnetic rotor 6 is formed at the inner circumferential portion and the outer circumferential portion thereof, respectively.

In addition, in normal usage, the direction of magnetization of the magnetic poles of the annular permanent magnet 5 is NS along the periphery of the circle. Therefore, the magnetic flux interlinking with the armature beam theory is The direction within the magnetic rotor is also along the circumference, whereas the direction of the magnetic flux of the frequency generator is adjacent to the inner periphery of the magnetic rotor 6, and therefore the direction of the above-mentioned torque generation. Since the magnetic path and the magnetic path of the frequency generator are not in the same direction, their interference can be significantly reduced. When it is desired to further eliminate the above-mentioned interference, there is also a means of using an isotropic annular permanent magnet having a pole only at the outer end as a permanent magnet instead of a heterogeneous permanent magnet.

In order to more actively cancel out the above-mentioned interference, two of the frequency generators described above should be installed in series, but the directions of the permanent magnets used for this should be NS pole and SN pole, respectively. It will be even better if the windings at the output end are connected in anti-series according to the direction. As described above, the present invention
In addition to promoting the sharing of parts and reducing the size,
This can be achieved by a high-performance electric motor with large output.
This is particularly effective in slotless electric motors.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional view showing the structure of a slotless electric motor according to an embodiment of the present invention, and FIG. 1B is a vertical cross-sectional view thereof. FIG. 2 is a sectional view showing a method for manufacturing an armature, which is a component part, as an embodiment of the present invention; FIG. 3 is an exploded perspective view showing a rotor part, which is a component part of the present invention; 4 is an exploded perspective view showing the stator section of the frequency generator, FIG. 5 is an exploded perspective view showing the position detection stator section of the position detection means, and FIG. 6 is an exploded perspective view showing the stator section of the frequency generator.
Figures A and B are front views showing the shape of the armature beam used in the present invention, and Figures C and D are plan views of the same. 1,1'... Armature wire theory, 2... Armature core, 3... Resin molding vulgarity, 4...
・Thermoplastic resin, 5...Annular permanent magnet, 6...Magnetic rotor, 7...Rotating shaft, 8...O-event for position detection, 9...
- Housing, 10... Magnetic annular plate, 11... Magnetic annular plate 12... Annular permanent magnet, 13... Signal wire ring, 14... Transmission coil, 15... Printed circuit board,
16... Position detection station, 17... Receiving coil. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A cup-shaped armature core made of a magnetic material that also serves as an outer casing, with an armature coil attached to the inner wall, and an annular permanent magnet attached to the outer wall, and an axial direction magnet that causes magnetic changes on the inner wall. a magnetic rotor having internal teeth extending therein, and rotatably disposed on a rotating shaft such that the outer periphery of the permanent magnet faces the armature wire at a required distance within the armature core; position signal means for detecting the positional relationship between the permanent magnet and the armature wire and sequentially supplying a current to the armature wire for generating rotational torque; A rotation speed detection mechanism for rotation speed control is provided with an annular permanent magnet magnetized in the axial direction and a signal wire interposed between two magnetic annular plates, and the rotation speed detection mechanism is connected to the first and second magnetic annular plates. is fixedly disposed inside the magnetic rotor so that the outer periphery of the magnetic annular plate faces the inner teeth of the magnetic rotor with a predetermined gap, and the rotational speed of the magnetic rotor is controlled from the signal wire ring. A slotless type electric motor characterized by being adapted to obtain a corresponding electric signal.