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Bicycle dynamo having a rotary-current generator
| Details |
Inventors: Werner, Hermann; Loessl, Erich; Mueller, Burkard;
Assignee: FER Fahrzeugeletrik GmbH (Eisenach, DE)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Nguyen; Tran N
Attorney, Agent or Firm: Evenson, McKeown, Edwards & Lenahan, P.L.L.C.
A bicycle dynamo with a rotary-current generator having a stator and a rotor which can be rotated relative to the stator. The stator or the rotor has radially extending pole fingers which are wound individually with one surrounding magnetic coil winding respectively. The ratio of the number of poles of the rotor to the number of poles of the stator is a non-integer value, and the ratio of the number of poles of the stator to the number of poles of the rotor is a non-integer value. This permits the implementation of a bicycle dynamo of a high efficiency even at a relatively low riding speed, which may be used, for example, to power bicycle lighting systems. |
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DETAILED DESCRIPTION This invention relates to a dynamo, and more particularly to a bicycle dynamo having a rotary-current generator which contains a stator and a rotor which can be rotated relative to the stator.
It is known that bicycle dynamos are used for feeding electric consuming devices arranged on the bicycle, specifically a headlight and a rear light, with electric energy generated by the wheel movement.
The dynamos are arranged on the front wheel, for example, as side or spoke dynamos.
For the use on bicycles, for example, synchronous generators are known which have a single wire-wound coil on the stator and three permanent-magnet pole pairs on the rotor.
Such single-phase bicycle dynamos have relatively high magnetic pole adherences.
Another difficulty of-such simply constructed bicycle dynamos is the fact that, although, because of the only one used coil, they have a high internal impedance which permits a self-limiting of the supplied power, a failure of the rear light or of the headlight results in a noticeable voltage rise at the respective other, still intact light source which therefore becomes excessively stressed.
In addition, at riding speeds below 15 km/h, these simple conventional bicycle dynamos do not yet furnish a power which is satisfactory for the operation of the bicycle lighting system, and in the case of high rotational speeds, the efficiency clearly decreases because of the formation of pronounced turbulent flows.
From German Patent Document DE 43 17 817 C1, a bicycle dynamo with a rotary-current generator is known in the case of which the stator consists of three identically constructed induction coils with pole finger cages made of soft iron, in which case the pole fingers of the individual pole finger cages are offset with respect to one another in the rotating direction by one third respectively of the distance of two adjacent pole fingers of the same pole finger cage.
This has the purpose of achieving a reduction of the magnetic pole adherence, that is, of the pole sensing ability, in that, in each case, only one stator cage can be in a full magnetic force connection while the respective other two stator cages partially take up a neutral position as the result of subtracting magnetic tensile forces on the pole fingers
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Generators or Motors 
