JPS6037008Y2 - Cup-shaped armature coil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cup-shaped armature coil used in DC brushless motors and the like.

Conventionally, cup-shaped armature coils include those in which the winding wire is wound in a cup shape from the beginning, and those in which coils made in units of several turns are combined and shaped into a cup shape.

However, these armature coils require a special winding machine due to their complicated coil shapes, and when shaping multiple coils into a cup shape, it is necessary to connect each coil. However, it has the disadvantage of requiring expensive equipment and complicated work.

In addition, in conventional devices that combine multiple coils to form a cup-shaped armature coil, the cross-sectional shape of the combined coils is circular, so the thickness of the cup-shaped armature coil is thicker than the number of turns of the coil. With,
There were many gaps between the coils on the side of the cup shape, making it impossible to obtain an efficient armature coil.

The present invention eliminates the drawbacks of the conventional device as described above, does not require a special winding machine, does not require connection between multiple coils, is easy to manufacture, can be manufactured at low cost, and has high efficiency. The purpose is to provide a cup-shaped armature coil.

The cup-shaped armature coil of the present invention is based on a flattened coil, which is shaped into a U-shape along the cylindrical outer periphery and combined with multiple similarly shaped coils. A single cup-shaped armature coil is formed by combining the two cup-shaped armature coils.

Further, the cup-shaped armature coil of the present invention is particularly suitable for use in a four-pole brushless motor.

An example in which the armature coil of the present invention is formed for a four-pole brushless motor will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the manufacturing process of the cup-shaped armature coil of the present invention.

Figure 1a shows a flattened coil that is the prototype of a cup-shaped armature coil.

This flat coil is shaped into a U-shape along the outer periphery of the cylinder using a cylindrical jig 1, as shown in Figure 1C, and finally shaped into a cylindrical shape as shown in Figure 1C. The coil 2 is shaped into a coil 2.

In the coil 2, among the coil parts forming the cylindrical side surface, 3 is an effective coil part that effectively works as an armature coil, and 4 is a part that does not work effectively as an armature coil, similar to the cylindrical bottom surface 5. , other co.

This is the overlapped part with Ile.

In addition, since the coil 2 is a flat wound coil shaped into a U-shape, the effective coil portion 3 formed on the side surface of the cylinder is formed from four straight portions along the axial direction of the cylinder. It will be configured.

Furthermore, the four active coil portions 3 are equally spaced along the circumference of the cylinder.

The coil 6 shown in FIG. 1d is a cylindrical shaped coil similar to the coil 2 described above, and is to be combined with the coil 2.

Coil 6 is heavy due to its combination with coil 2.

The bent portion 8 is shaped to have a larger radius than the overlapping portion 4 of the coil 2.

FIG. 2 is an explanatory diagram showing a state of the combination of coil 2 and coil 6 shown in FIG. 1.

As shown in FIG. 2a, coil 2 and coil 6 are in relative position.

The coil 2 is fitted inside the coil 6 with the rotation angle being 45 degrees, or 90 degrees in terms of electrical angles.

As can be seen from the figure, the relative position 4 of the two coils 2.6
Coils 2 and 6 can be rotated 5 degrees and combined.
The effective coil portions 3.7 of the coils are located in the gaps between the coils, and when combined, the effective coil portions 3 and 7 of the respective coils are arranged on the same circumference.

FIG. 2 shows a state in which two coils 2 and 6 are combined.

That is, one cup-shaped armature coil is formed by combining two cylindrically shaped coils.

In the cup-shaped armature coil formed in this way, when a driving current is supplied to one coil, the direction in which it flows is as shown in FIG.

As shown in the figure, the directions of current flowing through the four effective coil parts of one coil are the same in opposing coil parts, and in opposite directions in adjacent coil parts.

Further, other coils combined with this have similar current distributions.

Therefore, in a cup-shaped armature coil in which two coils are combined, regardless of the direction of the current supplied to each coil, there are four combinations in which the direction of the current flowing in adjacent effective coil parts is the same. As a whole, a magnetic field distribution for four poles is formed.

Also, if the direction of the current supplied to either coil is not reversed from this state, the effective coil parts where the current was flowing in the same direction until then will be in opposite directions, and the current flowing in the opposite direction will be replaced. The effective coil parts where the current was flowing are now in the same direction.

Therefore, if the direction of the current supplied to either coil is reversed, the overall magnetic field distribution will be rotated by 45 degrees with respect to the previous one, and similarly, the direction of the current supplied to each coil will be reversed in turn. By doing so, a rotating magnetic field can be created.

This state is shown in FIG.

FIG. 4 is a developed view showing the driving relationship between the cup-shaped armature coil and the rotor of the present invention.

In the figure, L1□-l, 14 are effective coil portions of the first coil L, L21-L2. is the effective coil portion of the second coil L2, N1. Sl, N2. S2 is the magnetic pole of the rotor.

Now, drive current is supplied to the two coils Ll and L2 in arbitrary directions, and the current distribution in the armature coil is as shown in Figure 4a.
Suppose you are in a situation like this.

At this time, assuming that the position of the rotor and its polarity are as shown in the figure, a rotational force F acts on the rotor in the direction of the arrow in the figure.

Next, when the rotor rotates and reaches the position shown in Figure 4, if the direction of the drive current supplied to the second coil h is reversed, the current distribution will correspond to the position and polarity of the rotor. As shown in Figure 4, the rotational force F continues to be applied to the rotor.
acts.

Similarly, as the rotor rotates, the rotor moves to the fourth position.
Reversing the direction of the drive current supplied to the first coil L1 when the position shown in Figure C is reached, and the drive current supplied to the second coil L2 when the position shown in Figure 4D is reached. , it is possible to continuously apply a rotational force to the rotor, and when the rotor is in the position shown in Figure 4e, the current distribution is changed by reversing the direction of the drive current supplied to the first coil L1. has returned to the state shown in FIG. 4a, and the rotor has rotated 1/2 from the state shown in FIG. 4a.

In this way, in the cup-shaped armature coil of the present invention, a desired driving magnetic field can be obtained simply by combining two coils and controlling the direction of the driving current supplied to each coil. There is no need to connect the coils to be combined when forming the coil.

Furthermore, since the cup-shaped armature coil of the present invention is based on a coil wound flatly, when this coil is shaped into a cylindrical shape, the thickness of the coil can be made thinner than the number of turns. In addition, the width of the effective coil part of the cylindrical coil is set to approximately 178 of the circumference, and the effective coil parts of each coil are combined so that they are lined up on the same circumference, so almost the side of the cup shape is filled with coils. It is possible,
A highly efficient armature coil can be obtained.

The above explanation is based on four cup-shaped armature coils of the present invention.
This is an example of a case where it is formed for a brushless motor with 4 poles, but by combining the required number of cylindrical coils, it is possible to create a cup-shaped armature coil that can be used in a motor with 4 poles or more. can.

As explained above, in the cup-shaped armature coil of the present invention, a flat wound coil is used as a prototype, and this coil is shaped into a cylindrical shape using a jig, and multiple similarly shaped coils are formed. Since cylindrical coils are combined to form a cup-shaped armature coil, there is no need for a special winding machine, and a rotating magnetic field can be obtained simply by sequentially reversing the direction of the drive current supplied to each coil. Therefore, when forming the cup-shaped armature coil, there is no need to connect the cylindrical coils that are combined, making it easy to manufacture and inexpensive, providing a highly efficient cup-shaped armature coil. can do.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing the manufacturing process of the cup-shaped armature coil of the present invention, and FIGS. 3 and 4 are explanatory diagrams showing an example of driving the cup-shaped armature coil of the present invention. 1...Cylindrical jig, 2,6...Cylindrical coil.

Claims (1)

[Scope of utility model registration request] A flat-wound prototype coil is shaped into a U-shape along the outer periphery of the cylinder, passing through the side and bottom surfaces of the cylinder, and the effective coil part consists of four straight parts along the axial direction of the cylinder, and the cylinder. A first coil having an overlapping portion along the circumferential direction of the shape, and shaped in the same manner as the first coil, and the overlapping portion is shaped with a radius larger than the overlapping portion of the first coil. and a second coil.The relative positions of the first and second coils are rotated by 90' in electrical degrees so that the effective coil portion of each coil is located in the gap between the effective coil portions of the other coil. A cup-shaped armature coil that is assembled so that each effective coil part is lined up on the same circumference.