JP2535228Y2 - Ultra flat coreless motor - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an ultra-flat coreless motor, and particularly relates to a vibration source of an extremely thin cassette type audio device, a card type pager and a sheet type massage device. Or a flat gear actuator configured by adding a pinion gear or the like to the output shaft.

(Prior art and problems to be solved) In recent years, each of the above appliances has become extremely thin so as to be easily portable, and the flat motors for driving these appliances are becoming increasingly thinner, and in particular, these days, the thickness is 2 mm. There is a strong demand for a flat motor of ~ 3mm. In such an ultra-thin motor, a motor including a conventional cylindrical commutator can no longer be formed, and a flat commutator made of a through-hole board as disclosed in Japanese Utility Model Laid-Open No. 62-74484 is used. I have to adopt it. However, when such a flat commutator is adopted, the sliding portion and the armature coil connection portion must be provided in the radial direction continuously to the sliding portion, so the outer diameter size becomes large, and in order to reduce the thickness, The fact that these must be accommodated in the inner diameter of the field magnet reduces the effective cross-sectional area of the field magnet facing the armature coil as much as possible, leading to deterioration of characteristics (efficiency). In other words,
In the structure in which the terminal of the wire-wound armature coil is soldered to the brush sliding surface side as in Japanese Patent No. 62-74484, there is a drawback that the terminal connection portion rises, even at the outer peripheral portion, so that the brush contacts the brush. Therefore, in order to avoid this contact, the outer diameter of the flat commutator must be made larger than necessary, and the inner diameter of the field magnet necessarily becomes larger.

This invention intends to provide a super-flat coreless motor that overcomes the above-mentioned problems by utilizing the features of the flat plate commutator made of such a through-hole printed wiring board.

[Structure of the Invention] (Means for Solving the Problems) In the invention, a part of the plate-type commutator (12) having such a through-hole-type plate-type commutator is connected to the wire-wound coreless armature coil (11 ... ), And the winding start terminal (11a) of the armature coil (11...) Is provided on the anti-brush sliding side pattern (12a) on the extended back surface.
…) Are connected.

(Operation) In this case, since the connection portion of the armature coil does not come to the sliding side of the brush, there is no risk of the brush abutting. Therefore, the outer diameter of the flat commutator can be made relatively small. Further, since the inner diameter of the field magnet does not need to be increased more than necessary, the effective sectional area of the magnet can be increased.

(Example) Hereinafter, an example of this invention is described based on a drawing.

FIG. 1 shows a cross section of a flat coreless motor of the present invention, 1 is a case made of a shallow inverted dish-shaped magnetic metal, 2 is an end bracket fitted to the opening edge of the case 1 and made of a magnetic material. Also serves as. 3 is a thin field magnet made of a neodymium magnet fixed to the bracket 2, 4 is a brush base arranged on the inner diameter of the magnet 3, 5 is a terminal planted on the brush base 4, and 6 is a brush base. Brushes 7a and 7b whose bases are spot-welded to the terminal 5 are oil-impregnated metals disposed at the center of the case 1 and the bracket 2, respectively. On the other hand, on the rotor R side, a shaft 8 rotatably supported by the metals 7a and 7b and a resin 10 are disposed on an outer peripheral portion of the shaft 8 via a rotor holder 9 so as not to overlap with each other as shown in FIG. A plurality of integrally-wound armature coils 11... Formed of a through-hole printed wiring board disposed on one side (brush side) of the armature coils 11 so that the brush 6 is elastically contacted. A commutator 12 and a slider 1 loosely fitted to a shaft so as to support the metal 7a, 7b with a small gap in the rotor holder 9 portion.
Consists of 3 and 14. The outer diameter of the flat commutator 12 slightly extends to the inner diameter of the coiled armature coils 11..., And the armature coil 11 Are connected by soldering. In addition, although not shown, it is configured to be connected via a through hole to a pattern constituting a brush sliding side commutator piece on the surface.

FIG. 3 shows an application to a vibration-type coreless motor in which the output shaft is not protruded. The description of each component is omitted because it is the same as in the above-described embodiment. As shown in FIG. 4, the eccentricity is achieved by forming a fan shape.

[Effects of the Invention] Since the invention is configured as described above, the flat commutator 12 does not need to have a portion for connecting the winding start terminal of the armature coil on the outer periphery on the brush sliding side, so that the diameter is relatively small. Since the end of the winding does not come out on the side circumference of the flat commutator, there is no danger of the winding coming out of the field magnet.

Therefore, it is not necessary to set the inner diameter of the field magnet larger than necessary, there is no risk of deteriorating characteristics (efficiency), and since the connection portion of the armature coil terminal does not come out on the brush sliding surface, the motor This is an extremely useful effect for reducing the thickness and size without sacrificing the thickness.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the ultra-flat coreless motor of the present invention, FIG. 2 is a plan view of the rotor of the embodiment from the side opposite to the brush, and FIG. FIG. 4 is a sectional view of the embodiment, and FIG. 4 is a plan view of the rotor of the embodiment as viewed from the side opposite to the brush. 1 is a case 2 is an end bracket 3 is a field magnet 11 ... is a coreless armature coil group 12 is a flat commutator

Claims (1)

(57) [Scope of request for utility model registration] 1. A case (1), a bracket (2) arranged on an opening edge of the case (1), a field magnet (3) arranged on the bracket (2), and a field magnet The brush (6) disposed on the bracket (2) at the inner diameter of (3) faces the field magnet (3) via an axial gap, and is disposed so as not to overlap with each other. Plural wound coreless armature coils (11
…) And a flat type commutator (12) made of a through-hole printed wiring board arranged on the brush side of the armature coil (11 ...) and brought into sliding contact with the brush (6). A part of the flat commutator (12) is extended to the inner diameter of the wound coreless armature coil (11...), And the armature is provided on the anti-brush sliding side pattern (12a) on the extended back surface. An ultra-flat coreless motor in which the terminals (11a ...) at the beginning of winding of the coils (11 ...) are connected.