CN1201461C

CN1201461C - Electric motor rotor having symmetric flux distribution

Info

Publication number: CN1201461C
Application number: CN 00131727
Authority: CN
Inventors: T·赫瑟; M·海德里希
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1999-09-14
Filing date: 2000-09-14
Publication date: 2005-05-11
Anticipated expiration: 2020-09-14
Also published as: GB2355861A; GB2355861B; GB0022103D0; BR0004166A; CN1288279A; DE19943951A1; JP2001112199A

Abstract

The present invention relates to a motor rotor(1), more particularly to magnetic resistance motor in tandem, comprising a shaft(15), an armature(12)and securing element(9). In the known technology, the securing element will generate dissymmetrical magnetic flux distribution inside of the rotor at the given rotor position. The present invention adopts the scheme of arranging the securing element(9)in a symmetrical fashion and aligning the securing element(9)to the rotor pole(5)at given position, so as to generate symmetrical magnetic flux distribution inside of the rotor. Thus, symmetrical torque can be realized and the wave property of the torque can be reduced.

Description

Rotor with symmetrical magnetic flux distribution

Technical field

The present invention relates to a kind of rotor with symmetrical magnetic flux distribution, the magnetic resistance motor rotor especially for serial connection comprises an armature, and its rotor is even number very, also comprises an axle and described armature is fixed on fixture on the axle.

Background technology

Rotor comprises an armature and an axle especially for the critical piece of magnetic resistance motor rotor of serial connection.These two parts must interconnect, thereby guarantee to realize from the moment of torsion transmission of armature to axle under all working condition.Often the fixing means that adopts is, with armature interference fit or pressure injection-moulded being encapsulated on the axle.This fixing means if can not meet the demands, then also can pass through fixture under higher moment of torsion or high temperature action, for example cooperate spring, key, dish type spring, perhaps makes a concave surface and realize simple and fixing reliably on axle.Usually thisly fixingly only adopt a fixture, for example be arranged on an armature pole below.

By the structure in the prior art, on plane perpendicular to the rotor longitudinal axis, particularly will occur asymmetric magnetic field flux on the armature spindle center line of the reluctance motor that is connected in series distributes, especially every this especially situation of motor that has two exciting electrodes mutually, because on certain location, the synchronous follow-up element can influence the distribution of magnetic flux.Will produce uneven magnetic flux distribution along with the diverse location of rotor like this.This flux change can influence the inductance of motor, thereby causes the change of moment of torsion and produce higher torque ripple.

Disclose a kind of rotor fixture in american documentation literature US-PS5365137, it is evenly distributed on the circumferencial direction of axle.But the relation between the quantity of the quantity of described fixture and armature pole wherein is not described, and how the relative position between fixture and the armature pole should be arranged.

Summary of the invention

The objective of the invention is to propose a kind ofly can in rotor, produce the rotor of symmetrical magnetic flux distribution, thereby can realize the inductance distribution curve of symmetry, moment of torsion is kept evenly, and reduced the fluctuation of moment of torsion in simple mode.

The technical scheme of above-mentioned purpose is a kind of rotor, the reluctance motor that is used in particular for being connected in series, comprise an armature, its rotor is even number very, also comprise an axle and described armature is fixed on the axle, be arranged on the fixture between axle and the armature, wherein, the quantity of described fixture equals half of rotor pole quantity at least, described fixture is evenly distributed on the circumferencial direction of axle, when described fixture is odd number, the radial centre lines of each fixture all constitutes the radial centre lines of rotor pole, and when described fixture was even number, the radial centre lines of each fixture was with the angle α five equilibrium of the rotor pole of two direct neighbors.

Particularly advantageous scheme is that described fixture is evenly distributed on the circumferencial direction.

Another favourable scheme is, described fixture is arranged on the certain location according to the quantity of the quantity of fixture and the armature rotor utmost point or is arranged on the specific armature rotor utmost point position.

Description of drawings

Reduced representation goes out some embodiment of the present invention in the accompanying drawing, below it is described in detail.

Fig. 1 a-e represents the fixture of various four utmost point rotors,

Fig. 2 a represents the magnetic flux distribution of a rotor on different rotor-positions with 2b,

Fig. 3 and 4 expressions have other embodiment of the rotor of fixture.

Embodiment

What represent in Fig. 1 a-1e is the structure that rotor 1 has four rotor poles 5 and two fixtures 9.Rotor 1 has an armature 12, and it for example is the steel disc group by the stacked formation of multi-disc sheet metal, and it surrounds axle 15 fully, and realizes contact fully.Rotor 1 has a longitudinal axis, and it is perpendicular to the floor plan of accompanying drawing.Rotor pole 5 is symmetrically distributed around longitudinal axis 17, and structure α in an angle mutually.

For rotor 1 being in operation or in the serial connection magnetic resistance electrode, forming symmetrical magnetic flux distribution, in one four utmost point rotor 1, for example can be around axle two of 15 symmetric arrangement (Fig. 1 a-c), four (Fig. 1 d) fixtures 9, perhaps eight fixtures 9 (Fig. 1 e).As fixture 9, for example can use needs fastening fixed connecting piece (key) or does not need fastening connector (cooperation spring).

Because the quantity of used fixture 9 is even numbers, so in Fig. 1 a-1d, fixture 9 is arranged between the rotor pole 5.The symmetrical radial transmission line 18 of a fixture 9 that passes two positioned opposite is with the angle α five equilibrium of the rotor pole 5 of two direct neighbors.These two fixtures 9 are point-symmetric for the center of longitudinal axis 17 under confined state.The insertion depth of fixture 9 in armature 12 or axle 15 do not influence above symmetry.

The fixture of representing in Fig. 1 a 9 passes original-shape and is circular axle 15.This fixture 9 for example can directly constitute on axle 15, or constitutes a flange 22.

Fig. 1 b represents another embodiment, on the axle 15 wherein a wrench faces 26 is arranged.This fixture 9 for example can directly be made on axle 15, perhaps by original-shape is constituted for circular axle 15 processes the plane.This structure can accomplish that equally also the position of wrench faces 26 and shape are point-symmetric with respect to central point.

That Fig. 1 c represents is another embodiment.Fixture 9 has wherein not only adopted the structure of the flange 22 among Fig. 1 a, but also has adopted the structure of the wrench faces 26 among Fig. 1 b, and both are combined.Each cross section of axle 15 all can directly constitute fixture 9 on axle 15, axle 15 can have at least one and cooperate spring or a key.This structure also must meet the following conditions, and promptly radial transmission line 18 passes fixture 9 symmetrically, and fixture 9 is point-symmetric with respect to central point.

Embodiment among Fig. 1 d has four fixtures 9.Fixture 9 wherein can from original-shape be on the circular axle 15 projection (Fig. 1 also can be a groove 30 perhaps a), and armature 12 can be inserted in this groove.On the position of groove 30, for example also can adopt spanner locating surface 26.Also can imagine the compound mode of any other fixture 9.Its prerequisite is that radial transmission line 18 symmetries are passed the fixture 9 of two positioned opposite, and fixture 9 is point-symmetric with respect to central point.

If the quantity of fixture 9 equals the quantity (Fig. 1 d) of rotor pole, then all fixtures 9 also can be arranged on the rotor pole 5.This is equivalent to axle 15 and rotates 45 degree around longitudinal axis 17 or armature 12 with fixture 9 in Fig. 1 d.

One four utmost point rotor 1 also can use eight fixtures 9, shown in Fig. 1 e.Wherein the fixture 9 of direct neighbor is alternately aimed between two rotor poles 5 and aligning rotor pole 5 from circumferencial direction.

Described fixture 9 also can form by the plastic deformation of axle 15.This connected mode is disclosed in the parts of Germany Patent document DE19755091A1.On an axial surface of armature 12, make the corrugated projection, be positioned at a side on this axial surface opposite, by the groove on the roll extrusion formation corrugated surface.The described projection that forms by the corrugated surface plastic deformation directly contacts with axial surface, thereby armature 12 is fixing.Described formation fixture 9 and can satisfy above Symmetry Condition around the projection of whole axle 15 moulding.

The projection that forms by roll extrusion does not need to extend along the whole circumference of axle 15.Each projection only need be aimed at rotor pole 5 or the position between it with symmetric mode.Also can adopt stamping tool to produce in addition and have the complete annular projection of same structure.

Fig. 2 a represents the field curve of a kind of rotor structure embodiment of the present invention, and it for example is one three a magnetic resistance electrode (not shown) that is connected, and comprises six stator poles 35 and four rotor poles 5.

Fixture 9 wherein for example can adopt the cooperation spring.This cooperates the position between two rotor poles 5 of spring aligning.Magnetic field line 38 passes a stator poles 35 and enters a rotor pole 5, rotates around the axle 15 with fixture 9, enters stator poles 35 at the rotor pole 5 in armature 12 opposites then.

Around stator poles 35 is winding 36, the winding of the stator poles 35 of schematically only having drawn among the figure, and magnetic field line 38 wherein extends to rotor pole 5 from stator poles 35.

Magnetic field line 38 for example can not pass fixture 9 herein, because it is non magnetic, so constitute magnetic resistance.Therefore with respect to longitudinal axis 17, on this position, will produce asymmetric field curve, if having only a fixture 9.Only, increase by second fixture 9, just can make the magnetic field line of relative longitudinal axis 17 realize symmetry in the opposite of axle 15 side according to scheme of the present invention.

Fig. 2 b represents that rotor 1 has rotated 90 magnetic field lines when spending.On any position, all can produce the Distribution of Magnetic Field line of symmetry.

Fig. 3 represents the embodiment of another rotor 1, and the quantity of the rotor pole 5 that it comprises is bigger even numbers.This is a rotor 1 that for example has 12 rotor poles 5, is used for four reluctance motors that are connected, and has six stator poles 35 (not shown)s.Described fixture 9 for example is to cooperate spring, and aims at the position between the rotor pole 5 of two direct neighbors.

Among the embodiment that Fig. 4 represents, the quantity of fixture 9 is odd number.Rotor 1 wherein for example has 10 rotor poles 5, is used for six reluctance motors that are connected, comprising 12 stator poles 35 (not shown)s.Described fixture 9 is aimed at rotor pole 5 with odd number.That is to say that radially alignment line 18 is passed fixture 9, be symmetrical in rotor pole 5 and extend.

Do not exist fixture 9 as shown in Figure 1 to have point-symmetric structure herein, because the quantity of fixture 9 is odd numbers with respect to the central point of axle 15.In this structure, radial transmission line 8 must symmetry pass fixture 9 and rotor pole 5 extensions.If the quantity of rotor pole 5 is divided into two odd numbers, and the quantity of fixture 9 equals the quantity of rotor pole or equal its twice, then fixture 9 can produce point symmetry with respect to central point.

If the quantity of fixture 9 equals the quantity of rotor pole, all fixtures 9 or aim at rotor pole 5 are then perhaps aimed at the position between the rotor pole 5 of two direct neighbors.

Rotor 1 shown in Figure 4 also can adopt 20 fixtures 9.From circumferencial direction, the fixture 9 of direct neighbor is wherein alternately aimed at the rotor pole 5 of two direct neighbors and is aimed at rotor pole 5.

Claims

1, rotor (1), comprise an armature (12), its rotor pole (5) is an even number, also comprise an axle (15) and described armature (12) is fixed on axle on (15), be arranged on the fixture (9) between axle (15) and the armature (12), wherein, the quantity of described fixture (9) equals half of rotor pole quantity at least, described fixture (9) is evenly distributed on the circumferencial direction of axle (15), when described fixture (9) is odd number, the radial centre lines (18) of each fixture (9) all constitutes the radial centre lines (18) of rotor pole (5), when described fixture (9) was even number, the radial centre lines (18) of each fixture (9) was with angle (α) five equilibrium of the rotor pole (5) of two direct neighbors.

2, rotor as claimed in claim 1, it is characterized in that, when the quantity of described fixture (9) equates with the quantity of rotor pole (5), the radial centre lines (18) of fixture (9) or with angle (α) five equilibrium of the rotor pole (5) of two direct neighbors perhaps constitutes the radial centre lines (18) of rotor pole (5).

3, rotor as claimed in claim 1, it is characterized in that, when the quantity of described fixture (9) is the twice of quantity of rotor pole, the radial centre lines (18) of the fixture of direct neighbor (9) or alternately with angle (α) five equilibrium of the rotor pole (5) of two direct neighbors on the circumference of axle (15) perhaps constitutes the radial centre lines (18) of rotor pole (5).

4, rotor as claimed in claim 1 is characterized in that, with cooperating spring or dish type spring as described fixture (9).

5, rotor as claimed in claim 1 is characterized in that, uses key as described fixture (9).

6, rotor as claimed in claim 1 is characterized in that, described fixture (9) is directly gone up at axle (15) and constituted.

7, rotor as claimed in claim 1 is characterized in that, described fixture (9) is directly gone up at armature (12) and constituted.