Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-01-19
2003-04-01
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S194000, C310S179000, C310S103000, C310S256000, C310S052000, C310S071000
Reexamination Certificate
active
06541888
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed first to a winding body for receiving a winding for an electromagnetomechanical converter with a winding area for the winding, which winding area is formed by a winding carrier and two legs which define the winding area in axial direction and are connected with the winding carrier.
2. Discussion of the Prior Art
Electromagnetomechanical converters are rotating electric machines which, with the aid of a magnetic field, either convert electrical energy into mechanical energy according to the motor principle or convert mechanical energy into electrical energy according to the generator principle.
Electric machines of this kind which can be constructed, for example, as synchronous machines or asynchronous machines have a stationary part, referred to as the stator, and a rotating part called the rotor. Depending on the type of construction of the electric machine, the rotor and stator are generally formed of a lamination stack comprising a yoke and a quantity of winding teeth. An electric winding (coil) is arranged in the slots between these winding teeth. When current flows through these windings, the magnetic field of the electric machine is generated.
The windings are associated with individual strands, wherein the windings assigned to a common strand are connected with one another. In the case of three-phase machines, a total of m strands are provided, wherein current is applied with a phase offset of 360/m.
The lamination stack with its electromagnetic components is generally referred to as a magnetic circuit. For example, the lamination stack can be constructed in one part, which means that the yoke and the winding teeth are constructed as an individual structural component part. In other known magnetic circuit designs, the lamination stacks are constructed in two parts. This means that the yoke as well as the individual winding teeth are initially produced as separate structural component parts and are subsequently combined to form a common lamination stack.
The use of winding bodies for producing the windings and fastening them to the winding teeth is already known. A known winding body developed by the present Applicant which has the features described above is shown and described in FIG.
2
.
In the case of one-part lamination stacks, two winding bodies are clamped into a winding machine and then wound with the winding. Particularly in electric machines with small lengths, the winding can be removed from the winding machine after being produced and can be placed on the respective teeth of the lamination stack.
With two-part lamination stacks, the winding bodies can first be connected with a winding tooth and inserted into the winding machine in this combination. Winding is then carried out with the result that a coil is formed by the winding tooth, the two winding bodies and the actual winding. The coil produced in this way can subsequently be connected with the yoke. However, the winding can also be produced in the manner described with respect to the one-part lamination stack.
As soon as the respective winding ends have been connected in the desired manner, the stator or rotor of the electric machine is finished.
In connection with the production of electromagnetomechanical converters and particularly the windings provided therefor, there is a need to accomplish this in ever more economical fashion while enhancing quality at the same time.
A first step in this direction was realized in general by the introduction of winding bodies. This will be explained briefly by an example. In one-part lamination stacks, it was formerly necessary to place the individual windings between the slots of the winding teeth by hand. In terms of manufacturing techniques, this is time-consuming and very cost-intensive. Through the use of winding teeth, it is now possible for the winding to be wound outside the lamination stack by machine. For one, this reduces costs considerably. Further, it results in qualitative advantages because up to 15 per cent more copper can be introduced into the slot by the mechanical winding process.
When the windings are provided for a one-part lamination stack, the winding teeth generally have no tooth head. A tooth head of this kind is generally formed at the free end of the winding tooth remote of the yoke, and the tooth head has a greater width than the actual winding tooth. The winding can be prevented from accidentally slipping off the winding tooth by means of the tooth head which, among other things, takes on electromagnetic functions. Therefore, insofar as the winding teeth have no tooth head of this kind, there is a risk that the winding can accidentally slip off the winding teeth and, therefore, off the lamination stack.
Further, considerable effort has been expended in recent times to simplify the wiring connection of the individual windings. Formerly, in order to connect the windings it was necessary for the respective ends of the windings forming a phase to be assembled and wired by hand. Subsequently, the winding strands formed in this way had to be insulated from one another and taped. This kind of connection was felt to be very disadvantageous because, on the one hand, it was very cumbersome and time-consuming and, on the other hand, very cost-intensive. Further, the guiding and supporting of strands which were formed in this way and guided to the individual lead connections required a great deal of space.
In order to avoid these disadvantages in construction, annular connection elements or connecting rings were developed; the connection rings are insulated from one another and the ends of the individual windings are fastened to them. It must be possible to fasten these connection elements suitably in a simple, safe and, above all, space-saving manner, which could not be satisfactorily accomplished heretofore.
SUMMARY OF THE INVENTION
Proceeding from the prior art mentioned above, it is the object of the present invention to provide winding bodies for a winding and an electromagnetomechanical converter by which the changing requirements for the construction design of the electromagnetomechanical converter that were described above can be taken into account. In particular, solutions are provided by which the disadvantages and problems described above can be avoided.
First, different variants for winding bodies will be suggested for meeting this object. The individual winding bodies according to the respective aspects of the solution have features that are known from the prior art, namely, from the winding bodies described in the introductory part.
First, the winding body has a winding area for the winding, which winding area is formed by a winding carrier and two legs which define the winding area in axial direction and are connected with the winding carrier. This winding area is accordingly limited on three sides. During the winding process, the winding is placed in this winding area. In order to prevent the winding from slipping out of the winding area, the legs are preferably constructed in such a way that they project over the winding carrier. In this way, they take on the function of end plates of a kind for the winding area against which the winding can be supported.
The various aspects of the solution have features, according to the invention, which satisfy the changing and increasing requirements for the winding body and electromagnetomechanical converter.
According to a first aspect of the solution of the invention, the winding carrier has a locking device for locking the winding body at a winding tooth. By means of this aspect of the solution, the winding is prevented from accidentally slipping off the winding tooth. The basic idea of this aspect of the solution is that each winding body has a corresponding locking device by which it can be connected with the respective winding tooth. The invention is not limited in this regard to determined types of locking devices. It is important only that the winding body can be held securely at the winding tooth
Baumeister Jens
Grau Edmund
Heyden Marcus van
Oppitz Horst
Cohen & Pontani, Lieberman & Pavane
Mannesmann Sachs AG
Mohandesi I A
Ramirez Nestor
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