DE102019114072A1 - Electric motor with optimized pole pair formation - Google Patents

Abstract

The invention relates to an electric motor (1) comprising two separate stator stacks (10), which are arranged in relation to one another in such a way that a receiving space (A) for receiving a rotor (30) is formed between the stator stacks (10), each stator stack (10) is formed from a first stator package part (10a) and a second stator package part (10b) connected to it in a form-fitting manner, a double coil body (40) formed from two coil formers (41) and a bearing plate (42) connected to the two coil formers (41) being provided is, which forms a bearing (43) for supporting a rotor shaft (31) of the rotor (30).

Description

The invention relates to electric motors in particular to electric motors with two pole pairs for expanding or optimizing the ratio potential.

From the prior art, single-strand motor sections with two pole pairs are available for various applications.

From the DE10 2004 053907 A a direct current motor with a two-pole, permanent magnet rotor and an at least two-pole stator, the poles of which carry an at least one-strand stator winding, is known, which can be supplied with current by means of an electronic commutation device depending on the rotor position, with a substantially cylindrical between rotor and stator There is an air gap. The motor is characterized in that at least one stator pole or a specially provided auxiliary pole is provided with an auxiliary winding to which current is applied to start the motor. According to a preferred embodiment of the invention, the auxiliary winding can also serve as a sensor winding for determining the rotor position.

Further electric motors with a simple structure are known from the prior art to be used in applications such as. B. Ventilation to be used in household appliances. For this purpose, for example, simply constructed electric motors in a plastic housing or as a platform module for easy integration are available.

Solutions with four-pole motor sections consume a lot of installation space, so that they often cannot be integrated into certain applications in a space-saving manner or not at all. Furthermore, the manufacturing costs associated with the technical concept are always a limiting factor for engine applications.

The invention is therefore based on the object of overcoming the aforementioned disadvantages and of providing a motor that can be manufactured inexpensively, in particular with an optimized installation space, and of optimizing or expanding the ratio potential in the electric motor.

This object is achieved by the combination of features according to patent claim 1.

• Maßnahme a: Ausbilden des Lagerschilds aus Kunststoff und insbesondere zweiteilig,
• Maßnahme b: Ausbilden des Lagerschilds als Kunststoff umspritztes Lagerschild,
• Maßnahme c: Bohrungen oder Öffnungen in den getrennten Ständerpakenten zur mechanischen Befestigung am Lagerschild vorsehen und/oder
• Maßnahme d: Bereitstellen eines Doppelspulenkörper mit integriertem Lagerschild.

According to the invention, the following measures in particular are provided, which also relate to the positioning of the stand:

• Measure a: Forming the bearing plate from plastic and in particular in two parts,
• Measure b: design of the end shield as a plastic encapsulated end shield,
• Measure c: Provide holes or openings in the separate stand packs for mechanical attachment to the end shield and / or
• Measure d: Providing a double coil body with an integrated end shield.

According to the invention, an electric motor comprising two separate stator stacks is provided for this purpose, which are arranged with respect to one another in such a way that a receiving space for receiving a rotor is formed between the stator stacks, each stator stack being formed from a first stator stack part and a second stator stack part connected to it in a form-fitting manner a double bobbin formed from two bobbins and a bearing plate connected to the two bobbins is provided, which forms a bearing for supporting a rotor shaft of the rotor.

In an alternative embodiment, the double coil body can either be designed to be integrated with a bearing plate and / or attached to the stator package parts.

In an advantageous embodiment of the invention it is provided that at least the surface of the bearing plate is made of an electrically non-conductive material. Alternatively, the entire end shield may be molded from a non-conductive (i.e., insulating) material.

Another advantageous embodiment is one in which the two stator stacks have an identical structure and can therefore be produced as identical parts. As a result, a compact design can be achieved through an essentially symmetrical arrangement to the rotor.

In a further advantageous embodiment of the invention it is provided that the first two stator package parts of each stator package are formed essentially L-shaped from two legs “S1, S2” each and that one leg is designed to accommodate one of the two coil bodies 41 . The second leg extends in the direction of the rotor receptacle and advantageously has an arcuate subsegment portion at the end which delimits the rotor receptacle space.

It is also advantageous if the two second, that is, further stator package parts of each stator package are formed essentially in an i-shape from a leg “S3”, with one leg at a connecting section of this leg Connection contour for in particular a form-fitting connection with a corresponding connection contour formed on each of the first stator package parts. In this way, windings can be mounted on the stator package in a particularly efficient way. At the other end section, ie opposite end section of this essentially I-shaped leg, a likewise arcuate subsegment section extends in the direction of the rotor receptacle and delimits the rotor receiving space.

In a further advantageous embodiment of the invention it is provided that the corresponding connection contours are designed as dovetail connections. These are attached so that when the two stator package parts are connected, the two legs with the arcuate subsegment sections are arranged parallel to one another and the two arcuate subsegment sections are adjacent to one another in such a way that they form an approximately semi-cylindrical delimitation of the rotor receiving space.

In a likewise advantageous embodiment of the electric motor according to the invention, it is provided that the end shield is made in two parts. In this case, the parting plane runs parallel to the leg that carries the windings and is approximately centered through the symmetrical arrangement of the double coil former.

Another advantage is a concept in which the bearing plate is designed as a bearing plate overmolded with plastic and in particular an electrical connection between the rotor and the stator is prevented as a result.

The end shield can alternatively or additionally be attached to the stator packs in the form of attachment openings, in which case an isolating attachment must then optionally be ensured.

• 1 eine schematische Schnittansicht eines erfindungsgemäßen Elektromotors und
• 2 eine Seitenansicht eines Ausführungsbeispiels eines erfindungsgemäßen Doppelspulenkörpers eines Elektromotors.

Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:

• 1 a schematic sectional view of an electric motor according to the invention and
• 2 a side view of an embodiment of a double coil former according to the invention of an electric motor.

In the following the invention with reference to the 1 and 2 explained in more detail, with the same reference symbols indicating the same structural and / or functional features.

The 1 shows a schematic sectional view of an electric motor according to the invention 1 . The electric motor 1 comprising two separate stand packages 10 which are arranged diametrically to each other relative to a central rotor position. Between the left and right stand package 10 there is a receiving space A for receiving a rotor 30th .

Every stand package 10 (i.e. that in the 1 and 2 each left and right stand package 10 is from a first part of the stand package 10a and a second stator package part connected to it in a form-fitting manner 10b educated. Like in the 1 The two stand packages are shown and can be seen 10 an identical structure.

The first stand package parts 10a , 10b every stand pact 10 are essentially L-shaped with two legs each S1 , S2 formed, which are oriented at an angle of about 90 ° to each other. The respective leg S2 is designed to accommodate one of the two bobbins 41 which are shown schematically in the figures.

The two second stand package parts 10a , 10b every stand pact 10 are essentially i-shaped from one leg S3 educated. At one end of the leg S3 namely at its connecting section 13 is a connection contour 14th especially for a form-fitting connection with a corresponding connection contour 11 of the thigh S2 on the first part of the stator package 10a educated. The corresponding connection contours 11 , 14th are designed as dovetail connections, which interlock positively in the assembled state.

Furthermore, in the exemplary embodiment 2 a double bobbin 40 made of two bobbins 41 formed, each bobbin 40 is wrapped and on the thigh S2 of the corresponding stand pact 10 is mounted. The double bobbin 40 also includes the two-part end shield 42 where the camp 43 for bearing the rotor shaft 31 of the rotor 30th is trained.

On each thigh S1 and S3 on the respective stator package part 10a , or. 10b is an arcuate subsegment section delimiting the rotor receiving space A. T intended. Due to the arrangement of the two stator packages 10 with the four arcuate subsegment sections T The result is a cylindrical receiving contour for the rotor (but with an air gap that changes in the direction of rotation LS ), this by narrow gaps S between each two directly adjacent partial segment sections T is interrupted.

The embodiment of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the solution shown even in the case of fundamentally different designs.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102004053907 A [0003]

Claims (10)

Electric motor (1) comprising at least two separate stator stacks (10) which are arranged in relation to one another that a receiving space (A) for receiving a rotor (30) is formed between the stator stacks (10), each stator stack (10) being composed of a first Stator package part (10a) and a second stator package part (10b) connected to it in a form-fitting or material-locking manner, with a double bobbin (40) formed from two bobbins (41) and a bearing plate (42) connected to the two bobbins (41) being provided which forms a bearing (43) for supporting a rotor shaft (31) of the rotor (30). Electric motor (1) Claim 1 , characterized in that at least the surface of the bearing plate (42) is formed from an electrically non-conductive material. Electric motor (1) according to one of the preceding claims, characterized in that the two stator stacks (10) have an identical structure. Electric motor (1) according to one of the preceding claims, characterized in that the two first stator package parts (10a, 10b) of each stator package (10) are formed essentially L-shaped from two legs (S1, S2) each, and one leg (S2 ) is designed to receive one of the two bobbins (41). Electric motor (1) according to one of the preceding claims, characterized in that the two second stator package parts (10a, 10b) of each stator package (10) are essentially i-shaped from a leg (S3) and are attached to a connecting section (13) of the Leg (S3) has a connection contour (14), in particular for a form-fitting connection with a corresponding connection contour (11), on which the first stator package parts (10a) are located. Electric motor (1) Claim 5 , characterized in that the corresponding connection contours (11, 13) are designed as dovetail connections. Electric motor (1) according to one of the preceding claims, characterized in that the bearing plate (42) is constructed in two parts. Electric motor (1) according to one of the preceding claims, characterized in that the bearing plate (42) is designed as a bearing plate encapsulated with plastic in such a way that an electrical connection between the rotor and the stator is prevented. Electric motor (1) according to one of the preceding claims, characterized in that the bearing plate (42) is alternatively or additionally attached to the stator packs (10) in the form of attachment openings. Electric motor (1) according to one of the preceding claims, characterized in that an arcuate subsegment section (T) delimiting the rotor receiving space (A) is provided on each of the legs (S1, S3) on the respective stator package part (10a, 10b).

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