DE102008019608A1 - Isolation support for a stator of an electric motor for driving liquid pumps - Google Patents

Abstract

The insulating support (1) consists of an inner cylindrical hollow body (1a) for receiving the rotor of the electric motor having on its outer side attachments (1b, 1b '), each having an inner space (2) for receiving an iron core (3) and each have on the outside a circumferential groove (4) for receiving coil windings, the respective groove base (4a) perpendicular and optionally parallel to the longitudinal axis of the cylindrical hollow body (1a). The invention further provides a method for producing the insulation carrier (1) and the use of the insulation carrier (1) as a can for electric motors for driving cooling water pumps in a motor vehicle.

Description

The The invention relates to an insulation support for a stator of an electric motor for driving liquid pumps. The invention further relates to a process for the preparation of Isolation carrier as well as on a use of the insulation carrier.

insulation support for stators of electric motors for driving liquid pumps are known.

In the DE 103 47 302 A1 is described a two-part volute casing for a centrifugal pump, which is designed aerodynamically optimized. Such centrifugal pumps are usually driven by an electric motor, wherein the stator of the electric motor are arranged in a drying room and the rotor in a wet room. The rotor thus rotates in the wet space, which is surrounded by the flowing medium to be pumped. The drying space and the wet space are separated by a separately arranged can, wherein it is necessary in a disadvantageous way for the assembly to keep a corresponding air gap between the stator and the can. This air gap reduces the power of the electric motor used or makes the arrangement of an electric motor with a higher power required to ensure the operation generally in the liquid pump. The stator itself consists of an insulating support of non-electrically conductive material, one or more iron cores and windings, which are arranged directly on the insulation support.

Of the Invention is based on the object, an insulating support for a stator of an electric motor for driving Liquid pumps to create, by its arrangement a gap between the stator and the can can be avoided can. The invention is also based on the object, a method for the preparation of the insulation carrier as well as a use to create the insulation carrier.

The The object underlying the invention is achieved by an insulating support for a stator of an electric motor for driving Liquid pumps solved, the one from an inner cylindrical hollow body for receiving the rotor consists of the electric motor, which on its outside attachments each having an interior for receiving an iron core have and in each case on the outside a circumferential Have groove for receiving coil windings, whose respective Slot bottom perpendicular and possibly parallel to the longitudinal axis of the cylindrical hollow body extends. The insulation carrier consists of an electric non-conductive material, such as plastic, being particularly advantageous polyphenylene sulfide (PPS) is used. It has surprisingly shown that by the arrangement of the Isolation carrier on keeping a gap between the stator and a split tube are completely omitted can. This is achieved by using the insulation carriers itself an inner cylindrical hollow body for receiving the rotor of the electric motor, which serves as a gap tube. On the arrangement of an additional separate can is omitted entirely in an advantageous manner. In this way it is achieved that the respective iron core as well the individual coil windings geometrically closer to the rotor be arranged so that the power of the electric motor accordingly can be designed lower to the operation of the liquid pump to ensure.

A preferred embodiment of the invention is that the cylindrical Hollow body at one end of a bearing for rotatable mounting of the rotor. In this way, a compact design ensured. Furthermore, the space required in an advantageous Way downsized.

According to one Another embodiment of the invention, the cylindrical Hollow body and the bearing of a single part. It is advantageous that the insulating support and the bearing in a single step can be made uniformly, which favors the serial production of the insulation carrier. On a subsequent attachment of the bearing on the cylindrical Hollow body, for example by an adhesive process, can be dispensed with in an advantageous manner.

The object underlying the invention is further achieved by a method for producing the insulating substrate, in which iron cores are introduced in injection mold and annularly positioned in a first step, and in a second step, the iron cores are encapsulated in an injection molding, wherein at the same time a cylindrical hollow body and on its outside attachments are formed with internal spaces for receiving the iron cores and the attachments each form a circumferential groove on its outer side, the respective groove base is perpendicular and optionally parallel to the longitudinal axis of the cylindrical hollow body. Surprisingly, it has been found that the insulation carrier can be produced in only two process steps, wherein at the same time the arrangement of the iron cores takes place. The exact shape of the insulation carrier is specified depending on the purpose or customer request by the injection mold used. The individual process parameters of the Depending on the materials used and the shape of the insulation carrier, the injection molding process is determined and adjusted in terms of engineering in advance. In order to realize the operation of the electric motor for driving liquid pumps, it is then only necessary to arrange the coil windings on the outside around the respective attachments and to position the rotor in the cylindrical hollow body. The normally required gaps between the stator and a separately arranged can, which adversely affect the performance of the electric motor, are not realized in an advantageous manner, since the cylindrical hollow body of the insulation carrier itself acts as a can.

To A further embodiment of the invention is provided in the second step at the same time on the front side of the hollow body a bearing for rotatably supporting the rotor in the injection molding process train. This is done in a particularly simple way by training achieved the corresponding injection mold. It is advantageous that the cylindrical hollow body and the bearing for the rotor in a single process step as a single part can be manufactured, which is the series production of the insulation carrier simplified.

object Finally, the invention is the use of the insulation carrier as a can for electric motors for driving cooling water pumps in a motor vehicle. As cooling water pumps come here For example, cooling water centrifugal pumps are used. there is particularly advantageous that in the arrangement of the insulation carrier to the additional separate arrangement of a can completely can be omitted, leaving adverse column, which is the performance could adversely affect the electric motor avoided be what especially in motor vehicles desired is.

The invention will be described below with reference to the drawing (in which 1 . 2 ) explained in greater detail and by way of example.

1 shows the insulation carrier with an iron core in longitudinal section.

2 shows the insulation carrier in the side view in the arrow direction according to 1 ,

In 1 is the insulation carrier 1 for a stator of an electric motor for driving liquid pumps shown in longitudinal section. The insulation carrier 1 consists of an inner cylindrical hollow body 1a for receiving the rotor (not shown) of the electric motor, which has on its outside attachments 1b . 1b ' each having an interior space 2 for receiving an iron core 3 exhibit. For clarity, only one iron core 3 shown. On the outside, the essays 1b . 1b ' a circumferential groove 4 for receiving coil windings (not shown), whose respective groove bottom 4a perpendicular and optionally parallel to the longitudinal axis of the cylindrical hollow body 1a runs. The cylindrical hollow body 1a has a bearing on a front side 5 for rotatably supporting the rotor. The cylindrical hollow body 1a and the camp 5 consist of a single part. In a particularly advantageous manner, the insulating support in an injection molding process with simultaneous arrangement of the iron cores 3 manufactured, wherein it is also particularly advantageous, the arrangement of the bearing 5 involved in the injection molding process. The arrow direction allows an advantageous side view of the insulation carrier 1 ,

In 2 is the side view of the insulation carrier 1 in the direction of the arrow in 1 shown. The insulation carrier 1 has on its outside a plurality of circularly arranged essays 1b . 1b ' on. By the arrangement of the respective circumferential grooves 4 is each of the essays 1b . 1b ' created for receiving coil windings. The insulation carrier 1 builds relatively compact and advantageously reduces power losses of the electric motor used (not shown).

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• - DE 10347302 A1 [0003]

Claims (6)

Isolation carrier ( 1 ) for a stator of an electric motor for driving liquid pumps, which consists of an inner cylindrical hollow body ( 1a ) for receiving the rotor of the electric motor, which has on its outside attachments ( 1b . 1b ' ), each having an interior space ( 2 ) for receiving an iron core ( 3 ) and in each case on the outer side a circumferential groove ( 4 ) for receiving coil windings whose respective groove bottom ( 4a ) perpendicular and optionally parallel to the longitudinal axis of the cylindrical hollow body ( 1a ) runs. Isolation carrier ( 1 ) according to claim 1, wherein the cylindrical hollow body ( 1a ) on a front side a bearing ( 5 ) for rotatably supporting the rotor. Isolation carrier ( 1 ) according to claim 2, wherein the cylindrical hollow body ( 1a ) and the warehouse ( 5 ) consist of a single part. Method for producing the insulation carrier ( 1 ) according to one of claims 1 to 3, wherein in a first step iron cores ( 3 ) are introduced into an injection mold and positioned annularly and in a second step, the iron cores ( 3 ) are injection molded in an injection molding process, at the same time a cylindrical hollow body ( 1a ) and on its outside attachments ( 1b . 1b ' ) with interiors ( 2 ) for receiving the iron cores ( 3 ) and the essays ( 1b . 1b ' ) each have a circumferential groove on its outer side ( 4 ) whose respective groove bottom ( 4a ) perpendicular and optionally parallel to the longitudinal axis of the cylindrical hollow body ( 1a ) runs. Method according to Claim 4, in which, in the second step, at the same time on the end face of the hollow body ( 1a ) a warehouse ( 5 ) is designed for rotatable mounting of the rotor in the injection molding process. Use of the insulation carrier ( 1 ) according to one of claims 1 to 5 as a can for electric motors for driving cooling water pumps in a motor vehicle.