JPH0810982B2 - Rotating electric machine having cylindrical coil - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotating electric machine such as an electric motor or a generator having a cylindrical armature winding (hereinafter abbreviated as a cylindrical coil).

[Conventional technology]

Conventionally used as a drive source for robots and various labor-saving equipment
Servo motors have been widely used, but recently, brushless motors are gradually being used instead of the DC servo motors. Then, in order to enhance the controllability of this brushless motor, a configuration is adopted in which a cylindrical coil is arranged along the smooth inner peripheral surface of the armature core.

FIG. 7 is an explanatory view showing a forming process of such a cylindrical coil. That is, first, an element coil of each phase is created by winding a conductor a plurality of times (Fig. 7 (a)), and then an element coil of each phase is bundled to create a band coil (Fig. 7 ( b)).

Next, a guide plate is obliquely placed along this strip coil (Fig. 7 (c)), and the vicinity of the left end portion is bent downward (Fig. 7 (d)). Further, this time, the central side of the strip coil is bent upward (FIG. 7 (e)). In this way, by spirally bending the strip coil along the guide plate, a spiral folded coil is formed (FIG. 7 (f)).

Then, pressurizing the formed spiral bending coil,
A flat body 13 as shown in FIG. 3 (a) is formed. By winding the flat body 13 around the mandrel 20, a cylindrical coil 7 having an outer shape D and a length L as shown in FIG.
Is formed.

Here, the protruding portions 13a, 13 surrounded by the dotted line in FIG.
In the present specification, b will be referred to as the “coil end portion” of the cylindrical coil. When forming the cylindrical coil 7, the coil end portions 13a and 13b are separated by
Stacked so that b is inside.

By the way, the coil end portions 13a and 13b are portions that are formed in order to reverse the winding direction of the conductors, and do not contribute to the generation of torque of the motor, and thus are portions that are originally unnecessary. Therefore, in assembling a rotary electric machine such as a motor or a generator, how to efficiently dispose such coil end portions 13a and 13b, which are unnecessary portions, without impairing various functions of the rotary electric machine It becomes an important issue.

4 to 6 are cross-sectional views showing an example of arrangement of coil end portions in a brushless motor. First, the method shown in FIG. 4 will be described. A rotating shaft 6 is rotatably supported via a bearing 5 in a case composed of a frame 1 and a bracket 2. The rotating shaft 6 has a yoke 4 and a field magnet 3 attached thereto.
A rotor consisting of is attached. The cylindrical coil 7 is fixed to the inner surface of the armature core 14 so as to correspond to this rotor, and the rotor is inserted into the cylindrical coil 7 with a certain gap. Reference numeral 9 denotes a slit plate attached to the counter-load side of the rotating shaft 6, and the slit is provided by the light emitting element 10 and the light receiving element 11 wired to the frame 1 and the detector cover 8 attached to the outer end surface of the frame 1. Is detected and the rotation speed and position of the rotary shaft 6 are detected. In FIG. 4, the coil end portion of the cylindrical coil 7 is bent outward in the radial direction of the motor, extends toward the armature core 14 side, and is connected to the lead wire 12.

In the conventional example shown in FIG. 5, the coil end portion of the cylindrical coil 7 extends in the axial direction and is connected to the lead wire 12.
Further, in the conventional example shown in FIG. 6, the coil end portion of the cylindrical coil 7 is bent inward in the radial direction, and the lead wire 12 has a length enough to be connected to the bent end portion inside the motor. Has been inserted.

[Problems to be solved by the invention]

However, each conventional method has the following problems.

In the conventional example shown in FIG. 4, since the coil end portion of the cylindrical coil 7 is bent outward, the outer diameter D ′ of the armature core 14 is increased.
The diameter D _{01 of the} bent coil end portion 13 is larger than ₀ (substantially outer diameter in magnetic circuit design). Therefore, the thickness ΔD of the armature core 14 which is magnetically unnecessary is required to be provided, the case size must be increased, and the weight is also increased. Further, since the coil end portions of the bent portions are overlapped with each other as described above, the bending portion has twice the thickness of the cylindrical coil 7, and the bending process is difficult.

In the conventional example shown in FIG. 5, since the coil end portion 13 does not need to be bent, the processing is easier, but since the coil end portion extends in the axial direction, the frame 1 also has a dimension L _t1.
As shown in (1), it becomes longer in the axial direction, and a dead space occurs in the internal space of the motor, which is an obstacle to miniaturization.

In the conventional example shown in FIG. 6, both the outer diameter D ₀ of the armature core 14 and the dimension L _{t2 of the} frame 1 can be made smaller than those in FIGS. 4 and 5, but the thick coil end portion can be bent. A difficult problem remains, and a space for inserting the lead wire 12 connected to the coil end portion from the frame 1 is required, and the dead space cannot be eliminated.

Therefore, it is an object of the present invention to provide a rotary electric machine having a cylindrical coil, which can be easily bent at the coil end portion and can be downsized without causing a dead space.

[Means for solving problems]

In order to achieve the above object, the present invention forms a spiral folded coil by spirally bending a band coil composed of a number of element coils corresponding to the number of armature phases, and this spiral broken coil is bent into a cylindrical shape. The cylindrical coil formed in this manner is arranged along the inner peripheral surface of the armature core, and this armature core is attached to the frame member on the outer side of the armature core. So that a storage space is formed
In a rotary electric machine having a cylindrical coil, in which a bracket member is opposed to this one end and attached to the frame member, coil end portions formed on the cylindrical coil are superposed, and among the superposed coil end portions, ,
The outer coil end portion is bent toward the outside at a substantially right angle, the inner coil end portion is bent toward the inside at a substantially right angle, and these bent coil end portions are connected to the armature core. It is characterized in that it is arranged in a storage space formed near one end.

[Work]

When housing the cylindrical coil in the case member of the rotating electric machine,
Since the coil end portion projects in the axial direction of the cylinder more than the other portions, it is preferable to bend the coil end portion at a substantially right angle in order to reduce the size. However, this portion to be bent is a portion in which the outer coil end portion and the inner coil end portion are overlapped with each other, and has a thickness twice that of the other portion, so that bending is difficult.

Therefore, in the present invention, the outer coil end portion is bent outward and the inner coil end portion is bent inward. The bending in this case can be easily performed because the bending is for one coil thick. The space required to house these coil end portions bent at substantially right angles is not so large. Therefore, the bending process can be facilitated and the size can be reduced.

〔Example〕

An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. Brackets 31 and 32 are attached to both ends of a cylindrical frame 30 to form a hollow case. A rotary shaft 34 is rotatably supported by the left and right brackets 31, 32 via a bearing 33, and the left end side of the rotary shaft 34 is pulled out from the bracket 31 and serves as an output end. A rotor including a yoke 44 and a field magnet 45 is attached to the rotary shaft 34, and an armature corresponding to the rotor is attached to the inner surface of the frame 30.

The armature is an armature core 40 fixed to the inner surface of the frame 30.
And a cylindrical coil 41 attached to the core 40 so as to be inserted into the core 40, and the rotor is inserted into the cylindrical coil 41 with a certain gap.

The cylindrical coil 41 is formed by making a coil in which a conductor is spirally wound into a flat shape, and winding this flat body in a cylindrical shape, and can be formed by the same method as that shown in FIG. Therefore, the description of the molding method is omitted.

The cylindrical coil 41 has an outer coil end portion 42 and an inner coil end portion 43.
2, 43 are mounted in the motor after being bent in directions away from each other. Each bending direction is such that the outer coil end portion 42 faces the outer armature core 40 side,
On the other hand, the inner coil end portion 43 is bent at a substantially right angle in a so-called double-door shape so as to face the inner rotor side.

Then, the bent coil end portions 42, 43 are attached so as to be in close contact with the bracket 32 on the non-load side (right side). Since the coil end portions 42, 43 are bent so as to be substantially perpendicular to the axial direction, the contact area at this time is large. In this way, the coil end parts 42, 43
By bending each other in opposite directions, the coil end portions that have been overlapped with each other have a thickness of 1/2, and the bending is easy, and the mounting space is small.

In the present embodiment, the coil end portions 42, 43 are closely attached to the bracket 32 on the side opposite to the output end on the opposite side (right side), so that the detector for detecting the rotation speed and the position of the rotating shaft 34 is the load. It is provided on the side. Detector is rotating shaft 34
Slit plate 35 attached to the light emitting element 36 mounted on the load side bracket 31 so as to sandwich the slit plate 35.
And a light receiving element 37 attached to a housing plate 39 extending from the frame 30 into the case, and a terminal 38 connected to the light receiving element 37 is drawn out from the frame 30 to the outside.

The fixing of the cylindrical coil 41 is performed by molding a resin 46 having a good heat transfer property, and the resin 46 allows the coil end portions 42 and 43 to closely adhere to the bracket 32. Therefore, the heat generated from the cylindrical coil 41 is satisfactorily transferred to the frame 1 and the bracket 32 via the heat transfer resin 46, and the frame 1 and the bracket 32 are indicated by the broken lines.
Since it is released from the machine from 32, the heat dissipation is good. This prevents heat transfer to the load side where the detector is provided, which has the merit that the operation of the detector is accurate and stable. Further, it becomes possible to apply to OA equipment in which the temperature rise adversely affects the function of the equipment, and it becomes possible to output high torque.

In the figure, reference numeral 48 is a storage space formed between the frame 1 and the bracket 32. In the storage space 48,
One coil end portion 42 of the cylindrical coil 41 is inserted, and the connector 47 is pulled out from the end portion of the coil end portion 42. Therefore, there is an advantage that the connecting work between the coil end portion 42 and the connector 47 becomes easy and the lead wire becomes short.

The present invention is not limited to the above embodiment, and various modifications can be made. In the cylindrical coil, the coil end portions at both ends may be in close contact with the bracket, and this contact is structurally unnecessary, and it is not necessary to mold the heat conductive resin. Further, there is no need to purposely provide a storage space for inserting one coil end portion.

〔The invention's effect〕

As described above, according to the present invention, since the coil end portions of the cylindrical coil are bent so as to be separated from each other, the bending process is facilitated and the mounting space for the coil end portion is reduced. There is an effect.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is its II.
-II line sectional drawing, FIG. 3 (a), (b) and FIG. 7 (a)
~ (F) is a perspective view showing the forming process of the cylindrical winding, Fig. 4,
5 and 6 are sectional views of a conventional example. 30 …… frame, 31,32 …… bracket, 44 …… yoke (rotor), 45 …… field magnet (rotor), 40 …… armature core, 41 …… cylindrical coil, 42,43 …… Coil end part, 4
6 …… Heat transfer resin, 48 …… Storage space.

Claims (3)

[Claims] 1. A cylinder formed by spirally bending a band coil composed of a number of element coils corresponding to the number of armature phases to form a spiral bent coil, and bending the spiral bent coil into a cylindrical shape. The coil is arranged along the inner peripheral surface of the armature core, the armature core is attached to the outer frame member, and a small storage space is formed near one end of the armature core. As described above, the bracket member is attached to the frame member while facing the one end.
In a rotary electric machine having a cylindrical coil, coil end portions formed on the cylindrical coil are overlapped, and of the coil end portions thus overlapped, an outer coil end portion is bent outward at a substantially right angle, The inner coil end portion is bent toward the inner side at a substantially right angle, and the bent coil end portions are arranged in a storage space formed near one end of the armature core. A rotating electrical machine having a cylindrical coil. 2. A rotating electric machine having a cylindrical coil according to claim 1, wherein an inner surface of the bracket member forming the storage space is
A rotating electric machine having a cylindrical coil, wherein the bent coil end portions are closely contacted with each other, and the storage space is molded with a resin having good heat conductivity. 3. A rotating electric machine having a cylindrical coil according to claim 1 or 2, wherein rotor position detecting means is attached near the other end of the armature core. Electric machinery.