Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-03-18
1996-02-20
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310179, 310254, 29596, H02K 118
Patent
active
054931622
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to a pole core. More particularly, it relates to a pole core which has pole lips for fixing a field winding in a pole housing of a direct current motor.
In a known pole core (WO 89/06874), pole lips extend from its central body along the longitudinal sides of the pole core. The field winding of the direct current motor is clamped between the housing inner wall, to which the pole core is screwed, and the pole lips. In order to avoid damage to the field winding insulation, a special elastic insulating material is introduced between the pole core and the winding. Installation tolerances are compensated by the plasticity of the insulating material and, where applicable, by the coil body insulating compound which also provides pre-fixing of the assembled unit, and hence prevents separation of the components.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a pole core which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a pole core in which the pole lips are resiliently and springily connected to a central body of the pole core and press the field winding against the pole housing.
When the pole core is designed in accordance with the present invention, it has the advantage that it allows high strength insulating coats, which have a much lower plasticity than conventional PVC coats, to be applied to the field coils.
Due to the resilient connection of the pole lips with the central body of the pole core, fitting tolerances can be compensated without the need for a special insulating body. At the same time, pre-fixing is ensured during fitting of the pole core and during the clamping of the field winding, whereby any loosening of the assembled unit is prevented, even when subjected to dynamic loads due to vibrations.
A particularly preferred design of the pole core is one in which the pole lips have a recess or a groove at the transition to the central body of the pole core. Stresses on the coil in the edge region are prevented due to the pole lip, in particular when the recess or groove is arranged on the inside, i.e. the pole lip side which faces the field winding, so that damage to the insulating layer is minimized.
The simple manufacture of the pole core is provided when grooves in the transition between the central body and the pole lips are produced simply by material displacement or material removal.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a perspective view of an electric motor with several field coils held by pole cores. One pole assembly is shown in part section;
FIG. 2 shows a part cross-section of an electric motor in accordance with FIG. 1 with a second design of a pole core in assembled position;
FIG. 3 shows a view of the pole core from the underside;
FIG. 4 shows a section through the second design example of the pole core; unassembled, and
FIG. 5 shows a section through the first design example of a pole core.
DESCRIPTION OF PREFERRED EMBODIMENTS
The perspective representation in accordance with FIG. 1 shows the housing 1 of a direct current motor 3. The housing wall has four field coils 5 clamped to it by means of associated pole cores 7.
One of the field windings is partly cut away to show that the pole lips 11 extend from the central body 9 of the pole core 7 in the region of the longitudinal edges of the core, extending over the entire length of the central body 9. The pole lips project over the field windings so that when th
REFERENCES:
patent: 893711 (1908-07-01), Cushman
patent: 1527162 (1925-02-01), Alvord
patent: 1929787 (1933-10-01), Mudge
patent: 2764802 (1956-10-01), Feiertag
patent: 3129348 (1964-04-01), Simmons
patent: 3549926 (1970-12-01), Pentland
patent: 4908535 (1990-09-01), Kreuzer
Eilert Klaus
Gritschmeier Walter
Kessler Hans-Juergen
Kleemann Dittmar
Kroeger Uwe
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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