JPS61273152A - Rotor of coreless motor - Google Patents

Abstract

PURPOSE:To effectively ridigly connect a coil strand with a commutator by bonding dummy insulating wires to the parts where the coil strands of outer and inner cylindrical coils are lacked. CONSTITUTION:A part where the coil strands 1 of an inner cylindrical coil 11 are extended is disposed at the position corresponding to a part where the coil strands 1 of an outer cylindrical coil 12 are extended, and dummy insulating wires 5 are bonded to the parts where the soil strands 1 of the coils 12 and 11 are lacked to set the interval between slits 25 constantly with respect to a radial direction. Thus, a connecting terminal 3 is engaged between the slits 25 disposed radially at the constant interval, and welded and connected. Since the terminal 3 is connected by both engaging and welding, the connection is effectively and rigidly performed.

Description

[Detailed description of the invention] (Technical field) This invention relates to a rotor for a coreless motor.

(Background Art) Conventionally, as shown in FIGS. 5 to 7, an inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel are fitted and combined. A rotor for a coreless motor is known that is formed using a coil unif (10) whose overlapping portions are successively joined to form an electrically closed loop.

In order for the coil wires 1 of the inner cylindrical coil 11 and the outer cylindrical coil 12 to form one continuous electrically closed loop as described above, it is necessary to satisfy, for example, the following conditions.

That is, the coil wires 1 forming the inner cylindrical coil 11 and the outer cylindrical coil 12 are both made of the same number and are arranged in parallel on the cylindrical surface without overlapping. When mating, it is necessary that each coil wire 1 of the outer cylindrical coil 12 overlaps with each coil wire 1 of the inner cylindrical coil 11 in the radial direction at each end. In the coil unit 10, slits 25 are formed at regular intervals at the cylindrical end.
is provided. This slit 25 allows the coil wires 1 arranged in parallel to be connected in units of a constant width W (the slit 25 shown in the figure
This is because it is easier to arrange a large number of coil wires 1 in an orderly manner on a cylindrical surface by arranging them in width units (intervals between coil wires). And in this case constant width W
The coil wire 1 of the inner cylindrical coil 11 and the coil wire 1 of the outer cylindrical coil 12 are shifted in the circumferential direction of the coil wire 1 by one unit. This can be done by connecting the radially corresponding coil wires 1 of the outer cylindrical coil 12 and the inner cylindrical coil 11 through the slit 25 with a bonding material 32, or by rectifying the coil wires 1 as shown in FIG. This is to make it easier to pass the connecting terminal 3 between the child 2 and the connecting terminal 3 between the two.

When the coil wire 1 is twisted in opposite directions to form the inner cylindrical coil 11 and the outer cylindrical coil 12, and when these are combined and fitted, the coil wire 1 of the inner cylindrical coil 11 is The coil wires 1 of the cylindrical coil 12 are not arranged point-symmetrically, but are fitted so that the coil wires 1 are shifted by one length at one end. In this way, the coil wires 1 arranged in parallel form one closed loop.

Conventionally, the inner cylindrical coil 11 and the outer cylindrical coil 12
To join the coil wires 1 that overlap in the radial direction,
As shown in FIG. 6, a bonding material 32 is placed between the coil wires 1 adjacent to each other in the radial direction, and the bonding materials are melted and bonded using a laser beam or the like.

The coil flange 3 is fitted to one end of the coil unit 10 formed as described above, and the rotating shaft 4 is inserted therethrough, and the cylindrical commutator 2 is attached to the coil flange 3 insertion portion of the rotating shaft 4. , as shown in FIG.
The rotor of the coreless motor is formed by connecting the two coil wires 1 corresponding to the radial direction of the slit 25 with the connection terminals 3 passing through the rack.However, the rotor of the coreless motor formed in this way is In the rotor, connection terminals 3 are placed on both of the two coil wires 1 located diagonally across the slit 25 in the radial direction.
Since the frame needs to be passed, it is difficult to connect it reliably and the connection strength is poor.

(Object of the Invention) The object of the present invention is to provide an inner cylindrical coil 11 formed by coil wires l of equal length arranged in parallel.
The rotating shaft 4 is inserted into the coil unit 10 formed by fitting and combining the outer cylindrical coil 12 and the rotating shaft 4.
In the rotor of a coreless motor in which a commutator 2 is attached to the coil unit, the coil wire 1 of the coil unit and the commutator 2
To provide a coreless motor rotor with reliable and strong connection.

(Disclosure of invention) The present invention will be described below based on an illustrative embodiment.

1 to 4 show an embodiment of the present invention, in which an inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel are fitted and combined. In the rotor of a coreless motor, a rotary shaft 4 is inserted through a coil unit 10 which is formed by a coil unit 10, and a commutator 2 is attached to the rotary shaft 4. For each unit of width W, the coil wire 1 of the inner cylindrical coil 11 and the coil wire 1 of the outer cylindrical coil 12 are shifted in the circumference direction by one coil wire 1, and the coil wire 1 of the outer cylindrical coil 12 is shifted by one coil wire 1. Inner cylindrical coil 11 corresponds to the part where 1 protrudes.
The part where the coil wire l protrudes is placed, and an insulating dummy wire 5 is attached to the part of the outer cylindrical coil 12 where the coil wire 1 is missing and the part of the inner cylindrical coil 11 where the coil wire 1 is missing. This makes the spacing between the slits 25 substantially constant in the radial direction, and the connecting terminals 3 are fitted and connected between the slits 25 to provide a rotor for a coreless motor.

In the drawings, 11 is an inner cylindrical coil, 12 is an outer cylindrical coil 12, and both are fitted so that the coil wires 1 overlap in the radial direction.

These inner cylindrical coil 11 and outer cylindrical coil 12 are formed by a conventional method.

The coil wire 1 is generally made of a metal wire such as copper or aluminum having good conductivity, and its outer periphery is covered with an insulating material 26 made of synthetic resin such as polyester resin or polyimide resin.

The bonding material 32 that fits and combines the inner cylindrical coil 11 and the outer cylindrical coil 12 and sequentially joins the overlapping portions to form an electrically closed loop is generally a metal wire of copper, aluminum, etc. with good conductivity. is formed.

In the illustrated coil unit 10, slits 25 are provided at regular intervals at the cylindrical end. The slits 25 allow the coil wires 1 arranged in parallel to be arranged in units of a constant width W (the width unit is the interval between the slits 25 shown in the figure), which makes it easier to arrange a large number of coil wires 1 in an orderly manner on a cylindrical surface. This is provided for the following reasons. In this case, the coil wire 1 of the inner cylindrical coil 11 and the coil wire 1 of the outer cylindrical coil 12 are shifted in the circumference direction by one coil wire 1 for each unit of constant width W. This is to facilitate connection between the coil wires 1 corresponding to the radial direction of the outer cylindrical coil 12 and the inner cylindrical coil 11 via the slit 25 using the bonding material 32. The part where the coil wire 1 of the inner cylindrical coil 11 protrudes corresponds to the part where the coil wire 1 of the outer cylindrical coil 12 protrudes, and the part where the coil wire 1 of the outer cylindrical coil 12 is missing and the inner cylindrical coil are arranged. By attaching insulating dummy wires 5 to the missing portions of the 11 coil wires 1, the spacing between the slits 25 is made constant in the radial direction.

In this way, the slit 25 is constant in the radial direction.
The connection terminal 3 is fitted in between, and the connection is made by welding by laser welding or the like.

Since the connection terminal 3 is connected by both fitting and welding, the connection is reliable and strong.The connection terminal 3 is formed by bending an elastic conductive metal piece into a V-shaped cross section. On the other hand, a notch 6 is formed between the opposing inner surfaces of the slit 25 into which both ends of the connecting terminal 3 having a V-shaped cross section are fitted, and the connecting terminal 3 is press-fitted into the slit 25, and both ends are inserted into the notch 6. When fitted and locked, it is prevented from being pulled out upwards, making the connection even more reliable and strong.

(Effects of the Invention) As described above, according to the rotor of the coreless motor according to the present invention, the portion where the coil wire 1 of the outer cylindrical coil 12 is missing and the portion where the coil wire 1 of the inner cylindrical coil 11 is missing. By attaching the insulating dummy wire 5, the spacing between the slits 25 is made constant in the radial direction, and then the connection terminal 3 is fitted into the slit 25 and the connection is made by welding. It has the advantage of being reliable and strong.

[Brief explanation of drawings]

1 to 4 are views showing one embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a sectional view, FIG. 3 is a perspective view, and FIG. 4 is a side view. 5 to 7 are views showing a conventional example, in which FIG. 5 is a perspective view, FIG. 6 is a perspective view, and FIG. 7 is a sectional view. 1 is a coil wire, 2 is a commutator, 3 is a flange, 4 is a rotating shaft, 11 is an inner cylindrical coil, 12 is an outer cylindrical coil, 25 is a slit, and 26 is an insulating film. Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1) The rotating shaft 4 is inserted into the coil unit 10 formed by fitting and combining the inner cylindrical coil 11 and the outer cylindrical coil 12 formed by the coil wires 1 of equal length arranged in parallel, and the rotating shaft In the rotor of a coreless motor in which a commutator 2 is attached to the coil unit 10, slits 25 are provided in the end face of the coil unit 10 in units of a constant width W, and the coil wire 1 of the inner cylindrical coil 11 and the outer coil wire 1 are provided in units of a constant width W. The coil wire 1 of the cylindrical coil 12 is shifted by one coil wire 1 in the direction of circumference division, and the inner cylindrical coil 1 corresponds to the part where the coil wire 1 of the outer cylindrical coil 12 protrudes.
An insulating dummy wire 5 is placed in the part where the coil wire 1 of the outer cylindrical coil 12 is missing and the part of the inner cylindrical coil 11 where the coil wire 1 is missing. A rotor for a coreless motor in which the spacing between the slits 25 is made substantially constant in the radial direction by adhesion, and the connecting terminals 3 are fitted and connected between the slits 25.