WO2008116678A1

WO2008116678A1 - Magnetic mount for an electric motor

Info

Publication number: WO2008116678A1
Application number: PCT/EP2008/050951
Authority: WO
Inventors: Ulrich Luedtke; Ralf Kunz
Original assignee: Robert Bosch Gmbh
Priority date: 2007-03-26
Filing date: 2008-01-28
Publication date: 2008-10-02
Also published as: DE102007014348A1; EP2130288A1

Abstract

The present invention relates to a magnetic mount (11) for an electric motor, the magnetic mount (11) forming a ring having a circumference. In order to easily assemble the motor, a plurality of recesses are provided along the circumference in which magnets (8) are received, and a cover element is provided around the circumference.

Description

Magnetic holder for an electric motor

State of the art

The present invention relates to a magnet holder for an electric motor according to the preamble of patent claim 1, a corresponding electric motor according to the preamble of patent claim 6 and a method for assembling the electric motor according to claim 7.

A known from the prior art magnetic holder forms a ring having a circumference. The magnet holder comprises a plurality of spring elements which are arranged along the circumference and press the magnets against a housing of the electric motor.

The disadvantage is that the assembly of the electric motor is cumbersome because the spring elements, in particular during assembly, push the magnets outward from the magnet holder.

Disclosure of the invention

The present invention has for its object to provide a magnet holder, an electric motor with the magnet holder and a method for assembling the electric motor, wherein the motor can be easily assembled.

The object underlying the invention is achieved by a magnetic holder with the features of the characterizing part of patent claim 1, an electric motor with the Merk- paint the characterizing part of claim 6 and a method according to claim 7 solved.

The present invention relates to a magnetic holder, wherein along the circumference a plurality of recesses are provided, in which magnets are accommodated, and wherein a cover member is provided around the circumference.

Advantageously, the cover protects a coating of the magnets during assembly when inserted into a housing and during operation against micro-movements. The recesses allow accurate positioning of the magnets and thus low tolerances. The magnet holder can be transported together with the magnets during production. The cover element also dampens vibrations. A thin cover member also leads to a low magnetic resistance to the magnetizable housing and thus to high performance of the electric motor.

In a preferred embodiment, the cover member is an adhesive tape.

Advantageously, an adhesive tape can be processed particularly easily.

In a preferred embodiment, the cover is a shrink tube.

Advantageously, a shrink tube allows a particularly permanent attachment of the magnets.

In yet another preferred embodiment, the cover member is an elastic band.

Advantageously, a cover can be processed very easily. In yet a preferred embodiment, the magnets are cuboid.

Advantageously, the production of cuboid magnets requires little effort, so that they can be produced inexpensively.

Further, the present invention relates to an electric motor with a magnetic holder, wherein a plurality of recesses are provided along the circumference, are accommodated in which magnets, and wherein a cover member is provided around the circumference.

Further, the present invention relates to a method of assembling an electric motor with a magnet holder, the magnet holder forming a ring having a circumference along which a plurality of recesses are provided, in which magnets are accommodated, comprising the steps of: inserting magnets in the recesses;

- Attaching a cover around the circumference of the magnetic holder; and

- Inserting the magnetic holder in a housing of the electric motor.

Short description of the drawing

In the following the invention with reference to the drawings will be described in more detail. In the drawings: FIG. Fig. 1 is a side view of a magnet holder prior to insertion of magnets;

FIG. FIG. 2 is a side view of the magnet holder after insertion of magnets; FIG. FIG. 3 shows a side view of the magnet holder after attaching a cover element;

FIG. 4 shows a view of a housing with the magnet holder after attachment of a cover element from above; and FIG. 5 is a sectional view of an electric motor with the magnet holder.

Embodiments of the invention

Hereinafter, a method for assembling an electric motor, as used in particular in hydraulic pumps of brake control systems for motor vehicles, based on the FIG. 1 to 5, which show a magnetic mount 11 (FIGS. 1 to 4) and an electric motor (FIG. 5) after successive steps 1 to 6, respectively.

FIG. Figure 1 shows a side view of a magnet holder 11 before insertion of magnets. The magnet holder 11 is preferably made of plastic, which is easy to work, because of its low hardness, the magnets are not damaged and has a low weight, and forms a one-piece dodecagonal ring of six first and second sections 1 and 3, which at an angle of 30 ° are inclined to each other. The first section 1 has a large recess 2 which is open at the bottom. The second section 3 has an upper recess 4, which is open at the top, a lower receiving recesses 5, which is open at the bottom, and on two opposite sides in each case a step 6 and a lower support projection 7.

FIG. 2 shows a side view of the magnet holder 11 after the insertion of magnets 8 (step 1), which are cuboid-shaped. Six magnets 8 are each received in one of the receiving recesses 5 so that they rest on the bottom of the support projections 7 and rest against the steps 6.

FIG. FIG. 3 shows a side view of the magnet holder 11 after attaching an adhesive tape 9 (step 2). The adhesive tape 9 has been glued around the circumference of the magnet holder 11 and covers the magnets 8, so that they are protected. The adhesive tape 9 prevents the magnets 8 from falling outward and presses them against the opposing steps 6. Instead of the adhesive tape 9, a shrink tube or elastic band can be used or several adhesive tapes can be used, which are adjacent to each other around the circumference or glued one behind the other along the circumference. The cover must therefore not completely surround the circumference. Characteristic of these cover is that they are flat, film-like and bendable and have a small thickness of preferably less than one millimeter.

FIG. 4 shows a view of a housing 10 with the magnet holder 11 after insertion of the magnet holder 11 into the housing 10 from above (step 3). The housing 10 is twelve-cornered and is typically made of steel. Between the magnet holder 11 and the housing 10, the tape 9 is provided. The housing 10 is closed at the bottom by the housing bottom 12, in the middle of which a lower shaft bearing 14 is formed.

FIG. 5 shows a sectional view of an electric motor with the magnet holder 11. The magnets 9 form the stator of the electric motor. To complete the electric motor, the rotor 17 and the commutator 18 (step 4), which are non-rotatably attached to the rotor shaft 16, and the sliding contact holder 19 (step 5), which is received in a fixing ring (21), and the housing 10 was closed by the housing cover 13 (step 6). In the center of the housing cover 13 is an upper shaft bearing 15. The rotor shaft 16 is rotatably mounted in the upper and lower shaft bearings 14, 15 and extends through a central axis of the rotor 17 and a central axis of the commutator 18. At the sliding contact holder 19 are two Sliding contacts 20 attached. The sliding contact holder is received in a fixing ring 21.

Claims

claims

1. Magnetic holder (11) for an electric motor, the magnetic holder (11) forming a ring having a circumference, characterized in that a plurality of recesses (5) are provided along the circumference, in which magnets (8) are accommodated, and that a cover member (9) is provided around the circumference.

2. Magnetic holder (11) according to claim 1, characterized in that the cover (9) is an adhesive tape.

3. magnet holder (11) according to claim 1, characterized in that the cover (9) is a shrink tube.

4. magnet holder (11) according to claim 1, characterized in that the cover (9) is an elastic band.

5. Magnetic holder according to one of claims 1 to 4, characterized in that the magnets (8) are cuboidal.

6. An electric motor with a magnet holder (11), wherein the magnet holder (11) forms a ring having a circumference along which a plurality of recesses (5) are provided, in which magnets (8) are accommodated, characterized in that along a plurality of recesses (5) are provided in the circumference, in which magnets (8) are accommodated, and in that a cover element (9) is provided around the circumference.

A method of assembling an electric motor with a magnet holder (11), wherein the magnet holder (11) forms a ring having a circumference along which a plurality of recesses (5) are provided in which magnets (8) are received the following steps: - inserting magnets (8) into the recesses (5); - attaching a cover element (9) around the circumference of the magnet holder (11); and

- Inserting the magnetic holder (11) in a housing (10) of the electric motor.