JP2986853B2 - Motor stator winding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a public method for increasing the degree of tightness of a coil end and reducing coil vibration in a racing structure of a motor coil end.

[Conventional technology]

As shown in Japanese Patent Publication No. 60-23581, the racing needles were knitted once at equal intervals through the gap between the coil rising portions between the slots. However, in a motor that is not subjected to a varnish treatment with a high current density, the degree of tightness of the coil is insufficient, so that problems such as insufficient insulation distance due to deformation of the coil end and insulation breakdown due to abrasion of the coil may occur.

[Problems to be solved and used by the invention]

In conventional racing, sufficient consideration was not given to the degree of tightness of the coil end, and if sufficient reliability could not be obtained by racing, processing such as fixing the coil with a varnish was necessary. .

An object of the present invention relates to a lacing structure of a coil end, such as a multi-layer sewing of a lacing, reinforcement fixing, varnish fixing of a racing portion to prevent loosening, or a method of setting a reinforcing ring at an end of a coil end shaft. The object of the present invention is to reduce the movement of the coil end of the electric motor which exerts a large force on the motor.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention is to add multiple lacing sewing or reinforcing fastening means as means for increasing the degree of tightness of the coil end. Furthermore, since the multiplexing of the entire circumference has a problem that the racing time becomes longer, the reinforcement of the number of stitches is particularly performed at the overlapping portion of the hetero-phase coil where the force between the coils is large.

[Action]

The main purpose of coil end lacing is to compress the coil end, secure a certain dimension, and tighten the coil to suppress electromagnetic vibration of the coil during operation of the motor and improve the life of the bond breaking. Becomes However, the force applied to the coil end causes attraction and repulsion due to the directionality of the current at the time of energization. Attraction occurs in the same phase, and attraction and repulsion occurs between different phases. Depends on Therefore, in single-spaced racing at equal intervals, the slack in the racing is pulled by a portion having a large excitation force, and the binding force at that portion is weakened. The coil end racing structure of the present invention, while strengthening the original binding force, and reducing the degree to which the slack portion of the racing is pulled by the strong excitation force, suppresses the deformation and vibration of the coil end, The insulation reliability of the motor can be improved.

〔Example〕

Embodiments of the present invention will be described below. This embodiment is an example in which the present invention is applied to a 12-slot three-phase four-pole motor.

As shown in FIG. 1, the coils have three phases, and are inserted into the slots 2 of the iron core 1 one by one. The rising portion 3 of each coil is represented by a mark (slot insertion position), and each coil is formed by the coil straddling portion 4 at the coil end. As is clear from the drawing, for example, between (2) and (3) of the slots, the out-of-phase coils overlap at the coil ends, and this occurs every other slot. As described above, a particularly large electromagnetic exciting force is generated in the approaching out-of-phase coil due to the repulsive force of the currents having different phases. Therefore, it is effective to increase the number of times of racing stitching of the overlapping portion or to perform reinforcement fastening to increase the degree of tightness of the coil end and reduce vibration. FIG. 1 and FIG. 2 show the case where the overlapping portions of the different-phase coils are double-laced. As shown in these figures, a multiplex racing part A as a reinforcing part is provided in a part of the racing position 5 to which a large electromagnetic force of a coil is applied, and a single racing part B is provided in other parts.

In this embodiment, the multiplexing is performed twice as the multiplexed lacing part A. However, the number of sewn laces may be increased as necessary.

In this embodiment, multiple stitches using the same lacing material are used. However, the present invention is not limited to this, and reinforcement and fastening may be performed using a wide tape, a binding material, or the like, which has a stronger fixing force than the main lacing material. In addition, the number of times of racing stitching of the coil portion 4 having a large straddle where the amplitude of the coil vibration becomes large,
Partial reinforcement may be performed by the reinforcement fastening portion.

 Another embodiment of the present invention will be described with reference to FIG.

The present embodiment has a motor stator racing structure in which a reinforcing ring 7 is set at an axial end of a coil end of a motor stator and is bound with a lacing material, thereby reducing the degree of freedom of coil movement. The ring 7 may be integrated with the stator interphase insulating material and bound with a racing material to reduce the degree of freedom of movement of the coil. The racing part 5 is pulled in a direction in which a force is applied, and a portion where movement is large loosens the degree of binding. If this loosening is prevented, the movement of the coil end is reduced, so that the displacement is reduced by fixing the cross portion 6 of the racing.

The part of the coil end that rises from the stator core is
Since the slot is restricted, a movement occurs with the rising portion as a fulcrum. Therefore, the entire movement can be reduced by fixing the ring for suppressing the movement to the axial end of the coil end by racing.

 Another embodiment of the present invention will be described below.

In this embodiment, in order to prevent the racing material from being loosened, the racing material is cured and fixed.

That is, in the coil end lacing of the motor stator, the lacing cross portion is fused or fixed with an adhesive material such as varnish so that the lacing is not loosened.

Specifically, a varnish in a semi-cured state, a racing material impregnated with an ultraviolet-curing type varnish, or a coil end racing of an electric motor while impregnating the varnish at the time of racing, and after the racing, performing a varnish curing to perform the varnish curing. Racing structure of motor stator that reduces looseness and fixes the cross section.

Alternatively, the lacing material may be made of a material having a high heat shrinkage, and may be shrunk by heat at the time of curing the varnish to further increase the degree of tightness.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, since the degree of tightness of a coil end is increased and the loosening of racing is reduced, or the degree of freedom of coil movement is reduced, the electromagnetic vibration of the coil end can be suppressed. Since wear can be reduced, insulation reliability can be improved.

In addition, when the number of times of racing stitching is locally increased, or when a reinforcing fastening or a reinforcing ring is set, the racing time can be reduced.

Furthermore, when varnish curing is performed only on the lacing material, the lacing is performed on the surface of the coil, so that overheating can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a developed side view of the coil of FIG. 1, and FIG. 3 is a side view showing another embodiment of the present invention in which a reinforcing ring is set. FIG. 4 is a plan view showing a conventional example. 1 ... stator core 2 ... status lot 3 ...
Coil insertion position, 4 ... Coil straddling portion, 5 ... Racing position, A ... Multiple racing portion, B ... Single racing portion, (1) to (12) ... Slot number, 6 ... Racing cross portion , 7 ... reinforcing ring, 8 ... lead wire

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Sakai 7-1-1, Higashi Narashino, Narashino City, Chiba Prefecture Inside the Narashino Plant of Hitachi, Ltd. (56) References JP-A-3-118749 (JP, A) Showa 64-74047 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 3/50 H02K 15/04

Claims (1)

(57) [Claims] 1. A stator winding of an electric motor having a multi-phase coil and a coil end lacing applied to a coil end portion of the coil, wherein the coil end portion where the different phase coil of the coil overlaps is a different phase coil of the coil. A stator winding for an electric motor, wherein a plurality of sewed portions are densely sewn by the coil end lacing from a coil end portion which does not overlap.