JP2510666B2 - Winding method for cylindrical armature winding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an armature winding of a servo motor, and in particular, replaces a DC servo motor that has been widely used for driving a robot or various labor-saving devices. The present invention relates to a winding method of a cylindrical armature winding (hereinafter, referred to as “cylindrical winding”) of a brushless motor, which is increasingly applied.

[Prior art]

Conventionally, in order to improve the control performance of brushless motors,
A smooth armature is used in which a cylindrical winding is fixed to the smooth void surface of the armature core.

In particular, in order to increase the winding space factor, as shown in FIG. 4, when forming the element coils 1 to 3 which are elements for generating the rotating magnetic field of each phase of the motor, a dedicated winding die is formed, An aligned winding method is performed in which windings are aligned and wound around this.

In this case, in order to match the controller for controlling the driving of the motor, as shown in FIG. 5, the band coil 4 is formed by forming each phase element coil in multiple layers.

In the conventional technique, the construction is carried out in the order from the process of FIG. That is, in the case of a three-phase motor, the U, V, and W-phase element coils are arranged with an electrical phase difference of 2 / 3π [rad], and the band coil 4 formed by bending them in a spiral shape is
A cylindrical winding is formed around the mandrel 7. Next, the terminals of each layer are connected in series and in parallel, and the terminals of each phase are connected to a star and a delta to form a balanced armature winding.

[Problems to be Solved by the Invention]

The conventional winding method of the cylindrical winding has the following problems.

In the conventional method of stacking multi-layer coils and winding them around a mandrel to form a cylindrical winding, there is a difference in circumferential length between the inside and the outside of the cylindrical winding.Therefore, when determining the number of windings by setting the winding constant, Determined by the inner circumference. Therefore, as shown in FIG. 9, a gap is created between the outer coil layer and the inner coil layer, and the winding space factor becomes low, and the overall winding space factor also decreases.

In the conventional winding method, the coil end portion of the band coil 4 is concentrated at a value obtained by dividing the circumferential length of the cylindrical winding by the number of motor pole pairs, so that the layer becomes thick as shown in FIG. . Therefore, it is difficult to perform bending work to shorten this portion.

Further, the coil end portion cannot be downsized because it becomes long as shown in FIG.

[Means for solving the problem]

As a means for solving the above-mentioned problems, the present invention provides an axial length Lt of a motor, a bending angle of an element coil which is an element for each phase of the motor α, and a circumferential length when the number of poles of the motor is P. Is a (Lt / cosα) x 2P band coil in which element coils that overlap in multiple layers are arranged with an electrical phase,
This band coil is spirally bent so that the same number of magnetomotive force poles as the required number of motor poles are produced to form a spirally folded coil, which is formed into a cylindrical shape and inserted and fitted into the inner peripheral surface of the armature core. In a winding method of a cylindrical armature winding that forms an armature portion of a motor, the element coil is divided into at least two parts, an outer part and an inner part, and the outer part element coil is an inner part by a circumferential length difference. Minute windings of the element coil, and by making the conductor diameters of the inner and outer element coils different from each other, the winding occupation ratios are set to be the same. After forming the spirally folded coil by bending each element coil for the inner part in a spiral shape and forming this into a cylindrical shape, make the coil end ends of the outer part and the inner part the same side so that the coil end parts do not overlap. And outside The polarity of each of the magnetomotive force of the partial inner portion of the cylindrical winding is fitted insert to be shifted to the maximum magnetomotive force point position is the same in the same direction, it is characterized in.

[Work]

If the cylindrical winding is divided into an outer portion and an inner portion as in the above configuration, and the inner portion is inserted into the outer portion and fitted so that the respective coil end portions do not overlap each other,
The bending operation of each coil end portion can be individually and independently performed. Therefore, the bending work can be easily performed. Further, the thickness of the coil end portion after bending is thinner than that of the conventional one, so that the length of the cylindrical winding can be shortened and the size can be reduced. Since the outer and inner coil conductor diameters are made different so as to have the same winding space factor, the motor characteristics can be improved as compared with the conventional case.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a case will be described in which a cylindrical winding for a three-phase motor, which is divided into an outer portion and an inner portion, is formed.

First, the element coils 1 to 3 of each phase shown in FIG. 4 are divided into two parts, an outer part and an inner part. In this case, the outer part has a larger coil conductor diameter than the inner part, and the element coil length l is set to be longer for the outer part than for the inner part.

Next, the band coil 4 and the spiral folding coil 6 for the outer side portion and the inner side portion are formed by the procedure shown in FIG. 6 and thereafter, as shown in FIG. Create each cylindrical winding. Then, as shown in FIG. 1, the inner cylindrical winding 21 is inserted into the completed outer cylindrical winding 20.

At this time, the coil ends of the cylindrical windings should not overlap, and the polarities of the magnetomotive forces of the outer and inner cylindrical windings should be in the same direction and the positions of the maximum magnetomotive force points should be the same. Insert by shifting.

Finally, connect the terminals of each phase in series or in parallel, and also connect the terminals of each phase to a star or delta to form a balanced armature winding. Bend and impregnate with resin to complete the production of the cylindrical winding.

FIG. 2 is a cross-sectional view showing a state in which the cylindrical winding thus created is mounted on a motor. As shown in this figure, since the coil end portion of the outer cylindrical winding 20 and the coil end portion of the inner cylindrical winding are vertically separated, the bending work can be easily performed. Further, in comparison with the coil end portion of the cylindrical winding 8 in the conventional example of FIG.
It is clear that the coil end portion in FIG. 2 is thinner. Therefore, the length of the cylindrical winding can be shortened, and the motor can be downsized.

Since the coil conductor diameter for the outer portion is made larger than that for the inner portion, as shown in FIG.
The clearance between the 20 coil conductors is closer than in the case of FIG. Therefore, the winding space factor is improved.

In the above embodiment, the case where the cylindrical winding is divided into two parts, that is, the outer part and the inner part, has been described. For example, in the case of three divisions, the cylindrical winding has three parts: the outer part, the inner part, and the inner part.
It will be composed by two.

〔The invention's effect〕

As described above, according to the present invention, the cylindrical winding is
The inner part is divided into at least two parts so that the coil end parts do not overlap each other, so it is possible to easily perform the bending work of the coil end part, which was difficult in the past, and to make the motor smaller. Can be achieved. Further, since the coil conductor diameter for the outer portion is larger than that for the inner portion, the winding space factor is also improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an outer cylindrical winding and an inner cylindrical winding forming a main part of an embodiment of the present invention, FIG. 2 is a side sectional view when loaded in a motor, and FIG. 3 is an outer cylindrical winding. Line and a partial front cross-sectional view of the inner cylindrical winding, FIG. 4 is a plan view of each phase element coil, FIG. 5 is a plan view of a strip coil, and FIG. 6 is a working process for forming a cylindrical winding from the strip coil. FIGS. 7 and 9 are explanatory views of a conventional example. 1 ... U-phase element coil, 2 ... W-phase element coil, 3 ...
V-phase element coil, 4 ... band coil, 5 ... winding type, 6 ...
… Spiral coil, 7 …… Mandrel, 8 …… Cylindrical winding,
9 ... Armature core, 10 ... Frame, 11 ... Field permanent magnet, 12 ... Rotor yoke, 15 ... Shaft, 20 ... Outer cylindrical winding, 21 ... Inner cylindrical winding.

Claims (1)

(57) [Claims] 1. When the axial length Lt of the motor, the bending angle of the element coil as an element for each phase of the motor are α, and the number of poles of the motor is P, the circumferential length is (Lt / cos α) × 2P. A coil coil is formed by arranging element coils that overlap each other in multiple layers with an electrical phase, and this coil coil is spirally folded so that the same number of magnetomotive force poles as the required number of motor poles are produced. In the winding method of the cylindrical armature winding, which is formed into a cylindrical shape and is inserted and fitted into the inner peripheral surface of the armature core to form the armature portion of the motor, The element coil for the inner portion is divided into at least two, and the element coil for the outer portion is made longer than the element coil for the inner portion by the circumferential length difference, and the conductor diameters of the element coils for the inner portion and the outer portion are different from each other. So that the winding space factor becomes the same. , And the element coils for the outer and inner parts are each bent in a spiral shape to form a spirally folded coil, and after forming this into a cylindrical shape, make the coil end ends of the outer and inner parts the same side, Insert and fit the coil ends so that they do not overlap, and the polarities of the magnetomotive forces of the outer and inner cylindrical windings are in the same direction and the positions of the maximum magnetomotive force points are the same. A winding method for a cylindrical armature winding, characterized in that