DE102004043425A1 - Segmental stator structure for electric motor has dovetail joints between adjacent broad and narrow segments, which carry alternate broad and narrow salient poles - Google Patents

Abstract

The stator of the electric motor has alternate broad (1) and narrow (2) segments. The dovetail joints (4) have tongues on the narrow segments extending into undercut grooves in the broad segments. The broad segments have broad salient poles (3) which may carry field coils. There are narrow salient interpoles between the broad poles.

Description

From the DE 101 19 642 A1 For example, a stator for an electric motor is known which comprises a laminated core having wound tooth segments and intermediate tooth segments. Disadvantageously, the yoke, in which the wound tooth segments are provided, must perform a housing-forming function for these tooth segments and produce mechanical hold. Therefore, the yoke is disadvantageous in thickness and the stator requires a large volume as a whole. Another disadvantage is the axial length limited to the height of the punching package, because yoke and toothed segment must come from the same punching cycle to meet the mechanical tolerances.

From the US Pat. No. 6,359,335 B1 a stator is also known in which, however, the toothed segments are constructed segmented. Disadvantageously, a special yoke is required for making the cohesion of the like segments. In addition, no intermediate teeth segments are present and therefore the dynamic properties of the electric motor in operation bad, especially its smoothness. The holding together can also be effected by shrinking. The shrinking is complicated and difficult because the tooth segments are not fixed during the shrinking process. In addition, a large number of wound tooth segments are necessary and the associated connection of the winding wires is costly.

From the GB 2 179 205 A For example, a stator is known which comprises toothed segments and intermediate tooth segments, the toothed coil having a non-constant tooth pitch. However, the intermediate tooth segments must be fixed in the yoke. For this purpose, the yoke must have sufficient amounts of material in the associated connection area. To generate a high torque thick wires are necessary because large currents are passed through. The introduction of the winding with such thick wires is technically demanding, consuming and not executable taking advantage of the entire space. So it is not a high Nutfüllgrad achievable in a simple and cost-effective manner. In particular, the stiffness of the wires complicates the winding of the toothed segments in the stator.

From the US 5,786,651 It is known to build the stator segmented, each toothed segment is constructed identically and is wrapped. In the circumferential direction of each toothed segment comprises a cantilevered, so male, spring and at the opposite end of a corresponding, ie female, groove. When joining, a deformation of the end portions is created, which generates a holding force for establishing the cohesion. The disadvantage here, however, the number of coils to be manufactured with correspondingly more electrical connections.

Of the Invention is therefore based on the object as possible compact and inexpensive, So to develop a little effort to be produced electric motor.

According to the invention Task in the electric motor according to the features specified in claim 1 solved.

basics Features of the invention in the electric motor are that it at least a stator comprising at least one laminated core, wherein the laminated core is composed of tooth segments by being wound Tooth segments and unwound intermediate tooth segments in the circumferential direction are provided alternately successively.

From The advantage here is that the electric motor is compact and with a high Power density and a high smoothness is executable. In particular are the poles alone each bewickelbar and are only when finished of the stator can be brought together with the intermediate poles. In this way is a high winding density achievable. In particular, the few are Tooth segments on a comparatively simple winder with high copper filling to wind and are only at the joining the stator can be brought together with the intermediate tooth segments. By this solution stay the later Switching costs limited.

at An advantageous embodiment is by means of the positive connection a connection by insertion in the axial direction providable. Especially is no elastic deformation when connecting the tooth segments provided in the connection area. Alternatively, by means of the positive connection a connection by clipping in the circumferential direction providable. Vorteiligerweise is an easy and fast to make in these two ways, firm and secure connection and thus a correct alignment and relative orientation of the tooth segments reachable to each other.

at An advantageous embodiment is when connecting the tooth segments provided an elastic deformation in the connection area. Especially a clip connection is provided. Vorteiligerweise is thus The production is particularly easy and quick to carry out and the elastic deformation the sheets of the laminated core usable.

at An advantageous embodiment is the pitch of the electric motor not constant. Thus, a particularly quiet operating behavior reachable by the electric motor.

at According to an advantageous embodiment, the toothed segments are stanzpaketiert. The advantage here is that the production is simple and inexpensive with known Machines executable is.

at According to an advantageous embodiment, the winding ends are each wound toothed segments immediately connected to contacts of a bobbin. The advantage here is that the production is particularly simple and economical is.

at an advantageous embodiment, the tooth segments by means Bonding connected. Advantageously, then a housing even Savable or a housing function only wielding Housing necessary, So causing without mechanical cohesion of the tooth segments.

at An advantageous embodiment is a housing for receiving the laminated core intended. The advantage here is that the laminated core is protectable and the case not just housing function but also makes mechanical cohesion feasible.

at an advantageous embodiment, the housing when finished on the laminated core shrunk. The advantage here is that an additional cohesion is predictable.

at According to an advantageous embodiment, the tooth segments are additionally by means Serrated springs toothed. The advantage here is that a smoother package is achievable.

at an advantageous embodiment are two in the axial direction or more laminated cores provided in a row. Is an advantage doing that, larger torques can be generated.

at an advantageous embodiment, the tooth segments are comprehensive Toothed segments provided on both sides with a groove and / or with a spring, radially inside and outside. In particular, the intermediate tooth segments are designed to be complementary. From The advantage here is that an alignment of the laminated cores to each other is reachable.

at In an advantageous embodiment, the electric motor is an electrical Three-phase machine with permanent magnets, a brushless DC motor a synchronous machine and / or a synchronous motor. Of course, the stator is too for others accordingly effective electric motors usable. Under electric motor are in This writing always understood electric machines, so electric motors and generators.

Further Advantages emerge from the subclaims.

The invention will now be explained in more detail with reference to figures: In the 1 a stator of an electric motor is symbolically drawn. The laminated core is executed stanzpaketiert and segmented, so it consists of lined-up in the circumferential direction toothed segments. toothed segments 1 and interdental segments 2 follow each other in turns.

Both the tooth segments ( 1 ) as well as the interdental segments ( 2 ) are preferably stamped from sheet metal ( 5 ) generated. It is advantageous to reinforce the connection of the sheets in the yoke back by a weld in, for example, axial direction.

The tooth segments 1 are windable from a winder, the Zwischenzahnsegmente 2 stay unwound. The tooth segments 1 have widened tooth heads 3 on. The winding is therefore not pushed onto the toothed segment but the toothed segment can be directly wound on a winding machine. The winding wire ends are preferably connected directly to contacts of a bobbin. Thereafter, the wound tooth segments and the intermediate teeth segments are joined together and connected.

A common housing may be provided, but is not absolutely necessary. Because the cohesion of the tooth segments and intermediate tooth segments is by a positive connection in the connecting areas 4 causes. In this way it is possible to achieve a uniform package and the cohesion of the same.

The positive Connection is exemplified by mushroom-shaped formations providable. there have the intermediate teeth segments on both sides each have a male Mushroom head on and the tooth segments on both sides in each case a female. Tooth segments and intermediate tooth segments are thus by insertion connectable in the axial direction.

at further embodiments of the invention become the Pizköpfe less pronounced, so that mating in the circumferential direction, So without axial insertion, is possible. The occurring Deformations are in the elastic range. Thus, then there is a clip connection in front. Instead of the mushroom heads are also correspondingly effective different forms possible.

In further embodiments of the invention is an additional bonding in the connecting areas 4 vorteilig.

The iron length in punching packages is technically limited. To get longer iron lengths be witnesses, two or more sub-packages are arranged one behind the other in further embodiments of the invention. In the case of toothed segments which consist axially of two stanzpaketierten sub-packages, it is advantageous to have the raised lugs of the stamped package pointing axially outward. For this purpose, a sub-package must be rotated by 180 degrees about a radial axis. Therefore, it is advantageous to provide the toothed segments on both sides with grooves or on both sides with a chamfer. The intermediate tooth segments are then executed correspondingly complementary.

From tooth segments and intermediate tooth segments accordingly 1 a stator packet is added and connected. This package can be pressed into a housing to achieve the degree of protection. In order to improve the heat conduction, it is advantageous to shrink the housing to the stator, wherein the housing is heated first before shrinking, is slipped over the laminated core and then cooled.

A further improvement of heat conduction let yourself by casting of the package in the housing with a plastic, preferably a filled plastic with a high thermal conductivity, achieve. additionally elevated Statorverguss the mechanical strength of the stator.

1

toothed segment

2

Between toothed segment

3

widened addendum

4

connecting area

Claims (18)

Electric motor, comprising at least one stator, which comprises at least one laminated core, characterized in that the laminated core is composed of tooth segments by wound toothed segments and unwound intermediate tooth segments are provided alternately successively in the circumferential direction and are positively connected. Electric motor according to at least one of the preceding Claims, characterized in that by means of the positive connection a connection by insertion in the axial direction is providable. Electric motor according to claim 2, characterized that when connecting the tooth segments no elastic deformation is provided in the connection area. Electric motor according to claim 1, characterized that by means of positive locking Connection a connection by clipping in the circumferential direction providable is. Electric motor according to claim 4, characterized that when connecting the toothed segments an elastic deformation is provided in the connection area. Electric motor according to at least one of the preceding Claims, characterized in that the tooth pitch of the electric motor is not is constant. Electric motor according to at least one of the preceding Claims, characterized in that the tooth segments are stanzpaketiert. Electric motor according to at least one of the preceding Claims, characterized in that the plates of the tooth segments in Jochrücken by welding connected to each other. Electric motor according to at least one of the preceding Claims, characterized in that the winding ends each wound Tooth segments just connected to the contacts of a bobbin are. Electric motor according to at least one of the preceding Claims, characterized in that the tooth segments and intermediate teeth segments additionally connected by gluing, stapling or welding to a stator are. Electric motor according to at least one of the preceding Claims, characterized in that a housing for receiving the laminated core is provided. Electric motor according to at least one of the preceding Claims, characterized in that the housing when finished on the laminated core has shrunk. Electric motor according to at least one of the preceding Claims, characterized in that the tooth segments by means of groove springs interlocked. Electric motor according to at least one of the preceding Claims, characterized in that in the axial direction longer tooth segments and Intermediate tooth segments are formed from partial packages. Electric motor according to at least one of the preceding claims, characterized in that the tooth segments comprehensive tooth segments on both sides with a groove and / or with a Bevel are provided, radially inside and outside. Electric motor according to at least one of the preceding Claims, characterized in that the intermediate tooth segments are designed to be complementary. Electric motor according to at least one of the preceding Claims, characterized in that the stator in the housing with Plastic is poured, in particular by means of a mold core. Electric motor according to at least one of the preceding Claims, characterized in that the electric motor is an electric three-phase machine with permanent magnets, a brushless DC motor is a synchronous machine and / or a synchronous motor.