DE19943088A1 - Wheel rim dynamo for production of current for bicycles, bicycle trailers or motorcycles uses magnetized rim and coil with iron core consisting of flat magnetic strip - Google Patents

Abstract

The electric current generation is facilitated directly using rotating wheels, without additional mechanical cost. A system e.g. a tachogenerator used for determining rpm can be used for current generation. In addition the possibility exists to swing the coil or turn it aside, to prevent idling losses. Instead of a separate dynamo a bicycle wheel can be magnetized and a current pick-up wound coil can be applied.

Description

Problem: With conventional driving dynamos, mechanical traction between, Tires and dynamo are manufactured. This results in various disadvantages as there are Loss of friction, poor balance in unfavorable weather conditions, splashing water Rain, low efficiency. A slightly better solution is the wheel hub dynamo, which, however, has the disadvantage of the low circulation speed. It's also practical not possible to let the hub dynamo completely idle, so that regularly little additional mechanical effort for the cyclist has to be overcome.

The rim dynamo is characterized by various advantages. It can be retrofitted without having to replace the wheel or rim. He claims no additional Power from the cyclist. It has no mechanics and therefore no mechanical losses, still wear. It can be realized inexpensively. It can be used in everyone regardless of the drive Wheel, i.e. front or rear wheel. It can not only be used in bicycles, but also integrated into every other bike, whether motorcycle or car, or truck bike.

The patent application is therefore explicitly not for use on bicycles limited. It can be used in any bike. Its use can can be used at any time to generate electricity. However, other data can also be tapped become multiple. For example, use as a tachometer generator is included simultaneous power generation possible.

Functional description

The dynamo mainly consists of two parts. The magnetized rim and the Coils with an iron core. The rim is magnetized, for example, by a flat one Magnetic tape, as is also used in the door seals of refrigerators and freezers. This procedure is also suitable for retrofitting. The magnetic tape is in the  Mounted inside the rim and pressed by the tire pressure.

It is important to ensure that commercially available magnetic door seals only have one pole each have a flat side.

Either two seals are installed in such a way that a north and south pole alternately on the coils is guided past, for example by wrapping two magnetic tapes around the hose.

Pay attention to opposite polarity.

I have made a prototype that works even with simple means.

For example, individual magnetic plates, which can be commercially available, are made out of Magnetic locks, attached to the outside of the rim.

With steel rims, a small distance of about one centimeter must be maintained around a magnetic one Avoid short circuit.

With aluminum, plastic, or other non-magnetic materials, the distance between the individual magnets can be realized to each other.

Even under difficult conditions, i.e. a steel rim that does not run without play in the axis and also is damaged with a so-called eight in the rim, you can easily generate electricity realize.

The performance can be increased by the iron core of the tapping coil, the magnets, similar to a pair of pliers, also encloses above and below.

In this case, an eight in the rim can be tolerated more easily.

The magnetic plates can be covered by a flat metal band, so that a rim brake can continue to function.

Of course, a rim with built-in magnets can also be produced in the mold.

A ring made of individual magnets can also be used as a single part, adapted to the common rim sizes, in Accessories with a spool and an iron core as a tap for retrofitting on old bikes or trailers be brought to the market.

The magnets must be attached in such a way that alternately a north and south pole in the steady Change is passed past the tapping coil.

The magnets can also be mounted on the inside of the fig.

Depending on the power requirement, several coils can be installed.

The performance can be increased as required without further measures being required on the rim.

The same measure can only be taken on the other if a particularly high output is to be tapped Side of the rim.

A construction is conceivable for sporty driving performance that enables the bobbins to be folded down.

According to experience on this side, the losses are so small that even during the day for safety reasons at least can be driven with a taillight.

The tapping coils can also be integrated into the rim brake.

If a magnetic tire is used, the coils can be attached over the brake pads become.  

A tire could with a built-in magnetic tape, as is known from refrigerator seals, be magnetized.

Note that changing magnetic polarity is required.

So either single strips are used, which creates a constantly changing polarity, attached, or flexible magnetic tapes with changing polarity must be produced.

I myself would arrange individual strips at an angle, since experience has shown that this is a high one Efficiency is achieved and because an existing series product can be used.

Once the magnets have been attached, other data, such as synchronization control or Tap the speed measurement.

Claims (1)

The patent claim is firstly made that direct power generation by means of rotating wheels is made possible without further mechanical losses and without additional mechanical effort.
Furthermore, on the fact that a plant once built can be expanded at any time.
In addition, the fact that other data can be tapped from the system once installed, for example the function of a tachometer generator or a synchronization control.
Also insists that it is possible to fold down the spools or to turn them off to avoid idling losses.