JP2760098B2 - Armature of DC motor - Google Patents

Description

The present invention relates to an armature of a DC motor.

[Prior Art] Conventionally, in an armature of a DC motor used for a starter for a vehicle, as shown in FIG. 7, each coil conductor 40a constituting an armature coil is formed in an upper portion within one slot 21a of an armature core 2a. An upper conductor 41a penetrating the space,
A lower conductor (not shown) is inserted from the tip of the upper conductor 41a into the lower space of the other slot 21a. The upper conductor 41a and the lower conductor 42a of each coil conductor 40a are formed in a round wire shape. In addition, US Pat. No. 1,808,749 discloses an upper conductor 41b and a lower conductor 42 of each coil conductor 40b, as shown in FIG.
b is formed in a rectangular wire shape, and the upper conductor 41b is further
It discloses an armature of a DC motor that is wider in the circumferential direction and smaller in the radial direction than b.

[Problems to be Solved by the Invention] Each of the above-mentioned round wire coil conductor and rectangular wire coil conductor has advantages and disadvantages.

In other words, the round wire-shaped coil conductor may be obtained by cutting a round wire-shaped material, and does not require processing of the cross-sectional shape.
If the center position of the coil conductor is determined in the insertion process into the slot, there is an advantage that the torsion is allowed. Furthermore, since the cross-sectional shape has no corners, there is an advantage that electric field concentration is eased, which is advantageous for insulation, and is widely used.

However, this round-shaped coil conductor has a drawback that it is difficult to increase the output because the coil cross-sectional area or the circumferential width of the teeth 22a of the armature core 2a is limited. That is, when the coil cross-sectional area is increased to increase the armature current, the circumferential width of the root portion 23a of the tooth 22a is reduced, and the amount of magnetic flux is reduced. When the circumferential width of the root portion 23a of the tooth 22a is increased to increase the amount of magnetic flux, the circumferential width of the slot 21a and the diameter of the coil conductor 40a are reduced, and the amount of armature current is reduced.

The armature disclosed in USP 1,808,749 is a rectangular wire-shaped upper conductor 41b formed in the circumferential direction wide and short in the radial direction,
An electric machine using a round wire-shaped coil conductor 40a by accommodating a rectangular wire-shaped lower conductor 42b formed narrow in the circumferential direction and long in the radial direction in a slot divergently opened in the radial direction. Child has improved the above problem. That is, in the armature shown in FIG. 8, even if the circumferential width of the root portion 23b of the teeth 22b is designed to be equal to that of the round wire coil-type armature, the slots are formed so as to diverge in the radial direction, and Since the rectangular conductor upper conductor 41b and the lower conductor 42b are accommodated in the entire rectangular slot cross section, the coil cross-sectional area can be increased, thereby improving the electric load.

However, the coil conductor 40b of this suehiro flat wire shape
Have the disadvantage that the processing of the cross-sectional shape is complicated. Furthermore, the center position of the coil conductor 40b must be determined in the insertion step of the slot, and furthermore, each plane of the coil conductor 40b and the inner surface of the slot must face each other in parallel over the entire area of the slot. Failure to maintain a uniform spacing from the inner surface adversely affected its insulation performance and the like.

The present invention has been made in view of such problems,
An object of the present invention is to provide an armature of a DC motor that can increase the cross-sectional area of a coil conductor and is excellent in workability and insertability of the coil conductor.

[Means for Solving the Problems] An armature of a DC motor according to the present invention comprises: an upper conductor having one end connected to one segment of a commutator and penetrating an upper space in one slot of an armature core; A coil conductor consisting of a lower conductor inserted through the lower space of another slot of the armature core from the end and connected to another segment of the commutator, and each slot of the armature core has the same cross-sectional area as each other In the armature of a DC motor in which a pair of the upper conductor and the lower conductor are housed, the upper conductor has a round wire shape, and the lower conductor has a long side extending in a radial direction and a short side extending in a circumferential direction. It is characterized by having a rectangular wire shape.

Naturally, the corners of the cross section of the lower conductor having a rectangular wire shape can be chamfered.

[Operation] The cross-section processing of the coil conductor is completed only by forming a round conductor having a diameter corresponding to the diameter of the upper conductor as a raw material and processing the lower conductor into a rectangular wire.

Since the circumferential width of the lower conductor is smaller than the diameter of the upper conductor, the circumferential width of the root of the tooth can be increased accordingly, and the magnetic saturation at the root of the tooth is reduced. As a result, the amount of interlinkage magnetic flux increases, and the output increases. If the circumferential width of the tooth root is constant, the slot depth can be increased, and the coil conductor cross-sectional area can be increased accordingly.

In other words, the coil conductors are arranged so as to extend almost radially in one slot by the round wire-shaped upper conductor and the rectangular wire-shaped lower conductor whose long sides extend in the radial direction. The output increases for a reason.

Embodiment An embodiment of an armature of a DC motor according to the present invention will be described with reference to the drawings.

The armature of this DC motor has an armature core 2 and a commutator 3 press-fitted into a shaft 1, as shown in FIGS. An armature coil 4 is inserted into each slot 21 provided on the outer peripheral surface of the armature core 2, and the armature coil 4 is made of resin 5.
Is fixed at a predetermined position inside the slot 21.

The armature coil 4 includes a plurality of coil conductors 40 (see FIGS. 2 and 3). Each of the coil conductors 40 includes an upper conductor 41 and a lower conductor 42 having a linear shape parallel to each other.
The upper conductor 41 has a connection line portion 43 connecting one end of the upper conductor 41 and one end of the lower conductor 42. The cross section of the upper conductor 41 is formed in a round line shape, and the cross section of the lower conductor 42 is formed in a rectangular wire shape. The upper conductor 41, the lower conductor 42, and the connection line portion 43 have the same cross-sectional area, and the other end of the upper conductor 41 and the other end of the lower conductor 42 are connected to different segments of the commutator 4. In the slot 21, one upper conductor 41 and one lower conductor 42 belonging to different coil conductors 40, 40 are inserted,
The upper conductor 41 is accommodated in the upper space in the slot 21, and the lower conductor 42 is accommodated in the lower space in the slot 21. Lower conductor 42
Is formed in a slot 21 such that its long side extends in the radial direction and its short side extends in the circumferential direction.

The shape processing of the coil conductor 40 is completed by forming one half of one round coated copper wire cut to a predetermined length into a substantially rectangular shape and then bending it into a pin shape (see FIGS. 2 and 3). I do.

The armature of this embodiment (see FIG. 4) has the same shape as the armature having a round wire coil conductor shown in FIG. Since the circumferential width A of 23 increases, the output can be increased by increasing the amount of magnetic flux. If the width A is equal to that of FIG. 7, the slot depth can be increased, and the cross-sectional area of the slot 21 can be increased.
The cross-sectional area of the coil conductor, that is, the amount of current can be increased.

Further, in this embodiment, since the cross-sectional shape of the lower conductor 42 of the coil conductor 40 is processed and the cross-sectional processing of the upper conductor 41 is not required, the manufacturing process is shortened, and the number of steps can be reduced.

FIG. 5 shows an example of the connection between each coil conductor 40 and the commutator 4. In this example, the segment of commutator 3
A stepped groove 31 is formed in 30, and a lower conductor 42 is placed on the bottom of the groove 31 and an upper conductor 41 is placed on the step of the groove 31 and soldered. In this way, the connection with the commutator 3 is simple and reliable.

FIG. 6 shows a modification of this embodiment. In this case, the lower conductor 42 is formed in a divergent shape, and the sectional area of the coil conductor 4 can be increased accordingly.

Further, in the armature shown in FIGS. 1 and 6, the upper conductor
Since 41 has a round wire shape, like the conventional armature having a round wire coil conductor, the slot side surface 25 of the eave portion 24 extending so as to cover the slot 21 from the protruding end of the tooth 22 is gently loosened. It can be curved, and the concentration of magnetic flux on the root portion 26 of the eaves portion 24 can be reduced.

[Effect of the Invention] As described above, the armature of the DC motor of the present invention
A round wire-shaped upper conductor is housed in the upper space in the slot,
The lower space of the slot accommodates a rectangular wire-shaped lower conductor whose long side extends in the radial direction and its short side extends in the circumferential direction, so that the coil is smaller than a conventional armature having a round wire-shaped coil conductor. The cross-sectional area or the circumferential width of the teeth can be increased, resulting in improved power.

Further, compared with a conventional armature having a rectangular wire-shaped coil conductor, the step of processing the cross-sectional shape of the coil conductor and the step of inserting the coil conductor into the slot can be simplified. That is, the cross-section processing of the coil conductor may be performed only by using a round conductor having a diameter matching the diameter of the upper conductor as a raw material and processing the lower conductor into a rectangular wire.

In addition, if only the axial center position of the upper conductor is determined in the upper space of the slot, the gap distance between the upper conductor and the inner surface of the slot can be defined. There is no need to adjust the inner surface to be parallel.

As a result, an armature whose output can be increased and whose manufacturing process is simple is realized.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of an armature of a DC motor according to the present invention. FIG. 1 is a partial sectional view of an armature core taken along line BB, and FIGS. 2 and 3 show coils shown in FIG. Conductor 40
FIG. 4 is a side view of the armature of the first embodiment, and FIG. 5 is a partial sectional view of an armature core of the DC motor of the second embodiment of the present invention. , Sixth
The figure is a partial sectional view of a segment of the commutator shown in FIG. 7 and 8 each show a conventional armature, and are partial cross-sectional views of an armature core. DESCRIPTION OF SYMBOLS 1 ... Shaft 2 ... Armature core 3 ... Armature coil 4 ... Commutator 21 ... Slot 40 ... Coil conductor 41 ... Upper conductor 42 ... Lower conductor

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 23/00 H02K 1/26

Claims (1)

(57) [Claims] An upper conductor having one end connected to one segment of a commutator and penetrating an upper space in one slot of an armature core, and a lower space of the other slot of the armature core being inserted from the other end of the upper conductor. And a coil conductor comprising a lower conductor connected to another segment of the commutator, wherein each slot of the armature core accommodates a pair of the upper conductor and the lower conductor having the same sectional area as each other. In the armature for a motor, the upper conductor has a round wire shape, and the lower conductor has a rectangular wire shape having a long side extending in a radial direction and a short side extending in a circumferential direction. Motor armature.