JPS5917612B2 - small dc motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects an inner coil and an outer coil wound in multiple layers to an inner commutator and an outer commutator, respectively, and a feeding brush is brought into sliding contact between the inner commutator and the outer commutator, and prevents short-circuiting. The object of the present invention is to provide a small DC motor that is easy to manufacture and is characterized by having a brush in sliding contact.

When a conventional small DC motor is wound in multiple layers as shown in FIG. ) were in sliding contact.

In this case, after winding the coils in sequence, each coil is separated, and the inner coil 1 and outer coil 2 are connected in series as shown in FIG. 5, and then connected to the segments of the commutator 3.

As shown in Fig. 6, before connecting to the commutator 3, the coil has a connection tap 4 to the commutator 3 and a coil series connection lead 5, and the work of connecting the coils in series is very complicated. It takes time and costs, and when the commutator 3 is installed as shown in Fig. 7, if the coil series connection lead 5 becomes long, the coil series connection lead 5 will rectify when connecting the commutator 3 and the coil. This had the disadvantage that it ran over child 3.

The present invention is intended to eliminate such drawbacks, and will be explained in detail below with reference to Examples.

In Figure 1, 1 is the inner coil, 2 is the outer coil,
Multilayer winding, each with an inner commutator 6 and an outer commutator 7
Connect to.

At this time, the inner coil 1 and the outer coil 2 are provided with a connection tap 8 to the inner commutator 6 and a connection tap 9 to the outer commutator 7 as shown in FIG. The rotor shown in FIG. 4 is obtained by connecting to the connecting portion 10.11.

The tap connection part 10 is connected to the inner commutator 6 by a conductor 12 provided on the back side of the commutator.

Feed brush 13.1 between inner commutator 6 and outer commutator 7
3 are brought into sliding contact, and the shorting brush 14 is also brought into sliding contact.

By applying a DC voltage between the feed brushes 13 and 13, a current flows through the inner commutator 6, the inner coil 1, the inner commutator 6, the shorting brush 14, the outer commutator 7, the outer coil 2, and the outer commutator 7 in this order. It flows and the motor rotates.

Although the above description has been made regarding two-layer winding, the same structure can be applied to multi-layer winding having two or more layers.

As described above, in the present invention, since the multi-layered inner coil and outer coil are connected to the inner commutator and the outer commutator, respectively, the tap coupling of the multi-layered coils can be performed very easily and the rotor can be formed at low cost. Furthermore, since the power supply brush is in sliding contact with the inner commutator and the outer commutator, and the shorting brush is also in sliding contact with the inner commutator, a multi-layer wound coil can be used effectively, and a highly efficient small DC motor can be obtained. It is something.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of an embodiment of a small DC motor of the present invention.
FIG. 2 is a partially cutaway perspective view of the same coil as above, FIG. 3 is a perspective view of the same commutator as above, FIG. Figure 5 is a diagram of the principle of a conventional small DC motor.
FIG. 6 is a partially cut-away perspective view of the same coil as above, and FIG. 7 is a partially cut-away perspective view of the same rotor. 1...Inner coil, 2...Outer coil, 6...Inner commutator, 7...Outer commutator, 13...Power supply Brush, 14...Short-circuit brush.

Claims (1)

[Claims] 1. An inner coil and an outer coil wound in multiple layers are connected to an inner commutator and an outer commutator, respectively, and a feeding brush is in sliding contact with the inner commutator and the outer commutator, and a short circuit brush is also in sliding contact with the inner commutator and the outer commutator. A small DC motor.