Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-09-14
2001-01-23
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S089000, C310S091000
Reexamination Certificate
active
06177741
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an electric motor or generator. More particularly this invention concerns a wiring system for connecting to the coils of an electric motor such as is used to drive a pump or blower.
BACKGROUND OF THE INVENTION
A standard electrical machine, normally a motor or generator, has a housing, a rotor rotatable in the housing about an axis, and a stator in the housing surrounding the rotor and having a plurality of windings each in turn having two ends between which an electric current is passed to create an electrical field. A contact support fixed to the stator on the side of the rotor opposite its axially projecting output shaft carries contacts adapted for connection to at least some of the winding ends. Such motors are used with the impeller of a pump or blower mounted directly on the output end of the shaft.
Normally such a motor is manufactured in an in-line process where the parts are fitted axially together. With such production it is necessary to resort to a separate manual step for connecting to the ends of the field windings. Furthermore when several windings are used, for instance in a three-phase system with six coils, one end of each winding is connected to one end of the diametrally opposite winding to produce three paired windings with six contacts, substantially complicating the paths the connections must follow. Three of these contacts are connected together as the center of a star connection, and the remaining three contacts are connected to the respective phases of the incoming feed circuit.
These interconnections are often made by soldering individual jumpers in place, a complex and expensive manual job that substantially increases the cost of the electric machine. Alternately it has been suggested to seat all the coil ends in a printed circuit board whose traces form the connections between the ends and between the ends and the input or output terminals. This latter system is difficult to realize because the high current cannot be readily transmitted through a standard printed-circuit trace. Boards capable of transmitting such high currents are very expensive.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved electric machine of the mass-produced in-line type.
Another object is the provision of such an improved electric machine of the mass-produced in-line type which overcomes the above-given disadvantages, that is which is simple and easy to manufacture, even if set up for multiphase use.
SUMMARY OF THE INVENTION
An electrical motor has according to the invention a housing, a rotor rotatable in the housing about an axis, a stator in the housing surrounding the rotor and having a plurality of windings each in turn having two axially directed and projecting ends, and a plate fixed to the windings and having an inner face turned axially toward the windings and an outer face turned axially away from the windings. The winding ends project axially past the plate and are exposed at the outer face thereof. In accordance with the invention connector strips on the plate engage and interconnect at least some of the winding ends. Contacts on the outer plate face are connected to at least some of the winding ends.
According to the invention the plate is axially fitted to the stator and the connector strips are on at least one of the faces of the plate. These connector strips can therefore be relatively robust so that the electric machine, which can be a motor or generator, is quite sturdy and reliable. Furthermore the entire machine can be assembled by automatic equipment in the standard in-line, that is axial, production method whereby the parts are mainly pushed together axially. The connector strips can be mounted on the plate before it is fitted to the motor and the windings can even be mounted on this plate beforehand.
In accordance with the invention one of end of each winding ends is connected via a respective one of the connector strips to a respective end of another of the windings. Furthermore the plate is formed with respective notches through which the winding ends pass. The connector strips have tabs engaging the respective winding ends. These tabs can be crimped, clipped, and/or soldered to the respective winding ends.
The plate according to the invention is provided with clips securing the connector strips in place thereon. It is disk-shaped and has a central hole through which the rotor projects.
In a three-phase system there are according to the invention six such windings having twelve such winding ends and the plate is formed with twelve angularly equispaced openings through which the winding ends project. Once again, one end of each winding is connected via a respective one of the connector strips to one end of the winding diametrally opposite it. Of course a delta connection system is also possible with the construction according to this invention.
The connector strips in accordance with the invention are on the outer face of the plate and cross at three points where they are axially spaced from one another. Each of the strips only crosses one other of the strips and the strips are of identical shape. Thus the entire subassembly formed by the plate, windings, and connector strips can be axially symmetrical, making assembly simple and relatively foolproof. Another connector strip on an inner face of the plate is connected to the other ends of the windings. Running the connector strips on each face of the plates in several planes allow metallic strips capable of carrying considerable current to be used.
The contacts according to the invention are formed by a plurality of sockets on the other plate face connected to respective ones of the strips. In addition each of the windings includes a dielectric holder frame.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1
is an axial section through a motor according to the invention;
FIG. 2
is a perspective view of elements of the motor; and
FIG. 3
is an end view of the structure of FIG.
2
.
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L{umlaut over (u)}tkenhaus Norbert
Schreckenberg Stephan
Dubno Herbert
Ramirez Nestor
Waks Joseph
Wilford Andrew
Wilo GmbH
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