JPH02206345A - Motor with adjusted rotational balance - Google Patents

Abstract

PURPOSE:To reduce an assembly time by indicating a position starting to wind a conductor on insulators to be bonded to the ends of an armature in advance and loading a balance weight on the inside of the insulators so as to keep rotational balance in case the winding is started from the position by a specific method. CONSTITUTION:After deciding a shape of an armature 14 and the number of turns of a conductor 20 in consideration of various elements and output characteristics of a motor, a winding method of the conductor 20 is decided. After winding the conductor 20 actually one time by means of the method, a rotational balance adjustment of a rotor 12 is made by bonding a weight having a proper weight to a proper position of insulators 18 and 19 of the end sections. Thus, after the completion of the rotational balance adjustment, a position 24 starting to wind the conductor 20 in that time is marked, and the insulators 18 and 19 loading the weight 26 to the inside thereof as it is at the position are designed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motor having an armature, and particularly to a motor that has a simple configuration and always maintains good rotational balance.

[Prior Art] The armature that makes up the rotor of a motor is divided into multiple slots at equal intervals in the rotational (circumferential) direction, and a conductive wire is wound around each tooth of the armature that is sandwiched between the two slots. . When assembling the rotor, the number of turns of this conductor is naturally made to be the same on all teeth, but
However, depending on the order in which the conductor wires are wound, it is unavoidable that the conductor wires wound later are stacked on top of the conductor wires wound earlier. Therefore, even if the number of turns is the same, the total length of the conducting wire around each tooth differs depending on the winding method, and the weight also differs. This unbalanced weight leads to vibration when the motor rotates, so in the past, after winding the conductor wires, an operator adjusted the rotational balance of each rotor, and used putty as a weight for balance adjustment at an appropriate position on the armature. It was attached.

Note that a resin insulator is usually attached to the axial end face of the armature in order to prevent damage to the wound conductor wire.

[Problems to be Solved by the Invention] An object of the present invention is to eliminate the above-mentioned inefficient balance adjustment work, achieve complete automation of the rotor assembly process, and reduce motor assembly time and costs. is to try to achieve this.

[Means for Solving the Problems] In the motor of the present invention made to solve the above problems, an insulator is attached to the end face in the axial direction of the armature, and the insulator has a winding start point of the conductive wire to be wound around the armature. It is a special effect that the position is displayed and that a weight for adjusting the rotational balance determined by the position and a predetermined way of winding the conducting wire is installed.

[Operation] First, the shape of the armature and the number of turns of the conducting wire are determined in consideration of the specifications and output characteristics of the motor, and then the method of winding the conducting wire is determined. Then, by actually winding the conductive wire once using this method, the rotational balance of the rotor is adjusted by attaching a weight of an appropriate weight to an appropriate position of the insulator on the end face. After the rotation balance adjustment is completed in this way, the current position of the winding start of the conductor is displayed.
In addition, an insulator is designed in which such a weight is housed in the same position.

In the mass production process, an insulator designed in this manner is manufactured in advance separately from the armature.

After erecting the armature, the insulator is attached to the end face, and the conducting wire is wound in the predetermined manner from the winding start position indicated on the insulator. This results in
When the conductor winds up, the rotation of the rotor is already balanced by the weight built into the insulator.

[Embodiment] An example in which the present invention is applied to a 12-pole DC motor will be described. FIGS. 1A to 1C show each stage of assembling the rotor 12 of the DC motor.

The rotor 12 includes a rotor shaft 16 fitted into the center of an armature 14 formed by laminating a large number of steel plates in the axial direction. Cross-sectional shape of armature 14 (
In other words, the shape of the steel plate constituting the armature 14 is as follows:
As shown in Figure 2 (A), the same number of poles (
12), the V-shaped throwers H4a are arranged at equal intervals. The radial tip portions 14c of the 12 teeth 14b of the armature sandwiched by each slot 14a widen in the circumferential (rotational) direction, and have a wider area than the stator (
(not shown).

As shown in FIG. 2(B), resin insulators 18 having the same cross-sectional shape as the armature 14 are provided on both axial end surfaces of the armature 14 so that the enameled wire 20, which will be described later, is not damaged by the edges of the armature 14. ■9 can be attached. Reinforcing ribs 18a and 19a are provided in portions of the insulators 18 and 19 along each tooth 14b.

The present insulator 1 or 19 plays an important role in the present invention, as explained later.

An enameled wire 20 is placed around each tooth 14b of the armature 14.
is wound a predetermined number of times, and the end of this enameled wire 2o is connected to a commutator 2 arranged around one end of the rotor shaft 16.
Connected to 2. Here, the manner in which the enameled wire 2o is wound and the order in which it is wound around each tooth 14b are determined in advance in consideration of the pole arrangement, winding efficiency, and the like.

A DC motor is completed by assembling this rotor 12 into a stator (not shown).

Next, the manufacturing process of this rotor 12 will be explained. First, before performing the mass production process, a preparatory process is performed. In the preparation process, in the configuration of the rotor 12, the rotor shaft 16 is inserted into the armature 14, and the insulator 19 is attached (FIG. 1(A)), and then any one thrower) is installed.
Mark 24 on insulator 18 or 19 at position 14aO (FIG. 2(B)). Then, start winding the enameled wire 20 from the slot 14aO at the position of the mark 24, and wind it around all the teeth 14b of the armature 14 in the predetermined winding method and winding order (Fig. 1 ([3), (C) ).

At this time, since the overlapping degree of the enameled wire 20 differs depending on the winding order, the length of the enameled wire 20 around each tooth 14b differs. Therefore, the moment of inertia of the rotor 12 around the axis of rotation is unbalanced, and if the motor is glued in this state, vibrations will occur during rotation.

Therefore, the rotational balance of the rotor 12 in this state is adjusted. This can be easily done by using a dedicated adjuster, and all that is required is to add a balance weight (weight) 26 of the specified weight to the angular position specified by the adjuster (see Figure 2). (B)).

Based on the results of such a preparation process, an insulator 18, 19 for the mass production process is designed in which a mark 24 indicating the thrower (14aO) at the beginning of winding of the enameled wire 20 is displayed and the balance weight 26 is embedded.

In the mass production process, such insulators 18 and 19 are manufactured in advance, and the rotor I2 is turned upside down in substantially the same manner as the above-mentioned preparatory process. That is, assembling the armature 14, inserting the rotor shirt 16, insulator 18a,
18b (FIG. 1(A)), and by winding the enameled wire 20 in a predetermined manner and order starting from the position of the mark 24 displayed on the insulator 18 or 19 (FIG. 1(B)), The rotor 12 is completed (Fig. 1 (
C)). In this mass production process, since the balance weight 26 is already embedded in the insulator 19 or 19 in a position and weight corresponding to the winding method of the enameled wire 20, there is no need to perform rotational balance adjustment again. Therefore,
The mass production assembly process of the rotor 12 can be automated,
Silking time is shortened and costs are also reduced.

It is ideal to embed the balance weight 26 integrally with the insulator during one-day molding as in the above example, but it is best to indicate in advance the position where the weight 2G should be installed, or to drill a hole in which it should be installed. Needless to say, the weight 26 can be assembled after that.

[Effects of the Invention] In the present invention, the winding start position of the conducting wire is indicated on the insulators attached to both ends of the armature in advance, and
A balance weight is also included so that the rotation can be balanced by starting from that position and winding in a predetermined manner. Therefore, there is no need to adjust the rotational balance of each armature in the armature assembly process, and the assembly process can be automated. This makes it possible to shorten assembly time and reduce manufacturing costs.

[Brief explanation of the drawing]

Figures 1 (A), (B), and (C) are side views showing the rotor wire winding process, Figure 2 (A) is a sectional view of the armature, and Figure 2 (8) is a plan view of the insulator. .

Claims (1)

[Claims] An insulator attached to an axial end face of the armature in a motor having an armature wound with a conducting wire, the insulator indicating the starting position of the winding of the conducting wire and which is predetermined as that position. A motor characterized in that it is equipped with an insulator containing a weight for adjusting the rotational balance determined by the winding method of the conductor wire.