DE102004049072A1 - Permanently excited motor especially electronically commutated motor has pole teeth connected by bridges around the rotor and permanent magnets held in channels - Google Patents

Abstract

A permanently excited motor (M), especially an EC motor, comprises a stator (2) with sheet packet (21) with pole teeth, grooves and windings and a rotor (1) with sheet packet and symmetrical tongues with channels for permanent magnets and pole teeth connected by bridges. The rotor face opposite the stator is completely closed.

Description

The The invention relates to a permanent-magnet motor, in particular a EC motor.

Of the EC motor (electronically commutated) is a brushless, permanent magnet Synchronous motor. The for This designation also used "AC servo motor" may cause confusion to lead, as she too for highly dynamically controlled asynchronous motors is used. To this ruled out the electronically commutated motor will subsequently become an EC motor designated. EC motors can as internal rotor motors or as external rotor motors accomplished be. The invention relates primarily to internal rotor motors, on the basis of which the invention is explained below. Nevertheless, that is Invention also in Aunenläufermotoren applicable.

electric motors have a fixed part and a rotatably mounted part on. The fixed part is called a stator or a stator. The rotatably mounted Part becomes rotor or runner called. In the following, the terms stator and rotor should be used be used.

The motor housing Of a permanent-magnet motor is often in the continuous casting process or made by deep drawing. In the motor housing is the Stator used, which includes a stator lamination and windings. In the sheets of Statorblechpakets are grooves for receiving the Milled three-phase windings or punched. The connection of the sheets to the laminated stator core takes place by means of a pronounced on one side of the sheet pile, which in the corresponding recess engages on the other side of the adjacent sheet metal.

On The rotor shaft of the permanent-magnet motor is the rotor core arranged, which has mostly punch outs for weight reduction. On the periphery of the rotor laminated core permanent magnets are arranged, the common unsolvable, for example with two-component adhesive, are attached. For some permanently excited Motors are in the sheets of the rotor core package grooves for receiving milled the permanent magnets or punched, which are circumferentially open.

adversely on the known EC motors is that magnetic splitter, which at known EC motors usually cause a blockage of the engine. Another disadvantage is that the sheets of Statorblechpakets only with a considerable proportion of broke, based on the used sheet metal surface, produced are.

Of the Invention is based on the object, a permanent-magnet motor specify at which the blocking of the engine by splintered Parts of the permanent magnets is effectively prevented. Another The object of the invention is to specify a permanent-magnet motor, the manufacture of the sheets for allows the laminated stator core with a much lower proportion of waste.

According to the invention Task solved by a permanent-magnet motor with the features of claim 1. Advantageous embodiments of the invention are the subject of dependent claims.

Of the permanent magnet motor according to the invention, comprising a stator and a rotor, wherein the stator is a laminated stator core with a plurality of pole teeth formed by grooves and has a plurality of windings arranged in the grooves and the rotor has a rotor core with a plurality of centrally symmetric arranged punched formed Polzähnen and a plurality of Having in the punching arranged permanent magnet is characterized in that the punches are arranged so that the pole teeth along the circumference of the rotor connected by webs are, so that the punched-out channels for receiving permanent magnets form and the stator facing surface of the rotor core completely closed is.

In the channels formed by the punched out the permanent magnets can be arranged. Through these measures is in the permanent-magnet according to the invention Motor prevents splintering from the permanent magnets Particles can lead to a blockage of the engine. For internal rotor motors is the surface facing the stator of the rotor laminated core, the outer surface of the essentially cylindrical rotor. In external rotor motors, however, is the Stator facing surface of the rotor laminated core, the inner circumferential surface of the substantially hollow cylindrical Rotor. By the described arrangement of the punched-out are the pole teeth connected by webs in the peripheral region of the rotor core.

In an advantageous embodiment of the invention, these webs narrower in at least one middle area than near the pole teeth of the rotor core.

Thereby is achieved that occurring through the closed design Flow loss as low as possible is.

In a further advantageous embodiment of the invention are additionally the End faces of the rotor core completely closed by Rotorendscheiben.

The Rotor end discs can in an internal rotor motor For example, be designed as discs of non-magnetic material, which are centered on the rotor shaft and the end faces of Rotor to outside diameter completely cover. As a result, a further improved protection of the engine against Blocking achieved.

In An advantageous embodiment of the invention are the permanent magnets glued into the channels formed by the punched out, wherein the permanent magnets surrounded by adhesive are.

Advantageous in this embodiment is that the adhesive both as sound-damping Element, as well as for the fixation of magnetic splinters serves.

In an advantageous development of the invention comprises the stator lamination a plurality of Polzahnblechpaketen.

each Polzahnblechpaket is in a known manner from a variety of Metal sheets joined together, However, in contrast to known stator lamination only one Pole tooth shape. The individual Polzahnblechpakete be with suitable Joined connecting means to a laminated stator core. By the division of the stator lamination in several Polzahnblechpakete If the stator lamination stack can be manufactured much less expensively, because in the production of sheets much less punching waste accrues. Furthermore can from individual pole tooth packets stator laminations different Configuration re the number of pole teeth can be produced, whereby tooling costs can be saved.

In An advantageous embodiment of the invention are the Polzahnblechpakete arranged with their end faces between two Statorendscheiben and thereby connected to a laminated stator core, wherein the Statorendscheiben Receiving means for positioning and fixing the Polzahnblechpakete exhibit.

By the fixed attachment of Polzahnblechpakete between the Statorendscheiben are the Polzahnblechpakete for the Bewlungung positioned and represent a solid unit.

In An advantageous embodiment of the invention are the receiving means for positioning and fixing the Polzahnblechpakete by angled projections the Statorendscheiben formed, each forming over the groove bottom surfaces grab two adjacent Polzahnblechpakete.

By this simple measure the Polzahnblechpakete are fixed in position.

In An advantageous development of the invention are the Statorendscheiben by overmolding the Polzahnblechpakete - except the rotor facing and facing away from the rotor surface - with a sprayable plastic produced.

To the Overmolding the Polzahnblechpakete these are according to the desired Form of the stator arranged in the injection mold accordingly, so that a windable stator is obtained. The connection of the Polzahnblechpakete by molding several Polzahnblechpakete is inexpensive and allows the production of large quantities. A suitable for encapsulation material is a sprayable plastic, for example PA.

In a further advantageous embodiment of the invention has at least a Statorendscheibe contact elements for contacting the windings on.

By the attachment of such contact elements is the contact of the Stator windings from the front of the stator with low Effort possible.

Advantageous the contact elements are pressed into the Statorendscheibe. This Process is particularly cost-effective and automated feasible.

In a further advantageous embodiment of the invention are the Contact elements designed such that the contact of the windings to the power electronics of the motor by plugging, insulation displacement technology, welding or soldering can be produced.

The Contacting of the stator windings becomes significant as a result of this measure simplified and thus automatable. For this purpose, advantageously a punched board be used.

In another advantageous embodiment of the invention is the the rotor facing away from the surface Statorblechpakets packetized by a ring of individual sheets Sleeve completely closed, wherein the inner contour of the annular individual sheets a pole teeth having corresponding contour for positive reception of the pole teeth.

This will cause the magnetic return ensured between the Polzahnblechpaketen. After the winding of the stator, in the case of internal rotor motors, the sleeve packeted from the annular individual sheets is pushed over the wound stator stack.

The particular advantages of the invention are that blocking the engine by splintered parts of the permanent magnets effectively prevented. Furthermore, the invention enables the production the sheets for the laminated stator core with much less waste. Of the Engine is overall cheaper produced.

following is an embodiment of Invention with reference to figures closer explained. In this demonstrate:

1 schematically a perspective view of a rotor of a motor according to the invention,

2 schematically a perspective view of a stator of a motor according to the invention,

3 the motor according to the invention in the assembled state with rotor and stator open to the front, and

4 the engine according to the invention in the closed state.

each other corresponding parts are in all figures with the same reference numerals Mistake.

The permanent-magnet motor M according to the invention comprises a rotor 1 and a stator 2 ,

In 1 is the rotor 1 of the motor M according to the invention, in 2 the stator 2 and in 3 and 4 the motor 4 shown in the assembled state.

The rotor 1 has a rotor core 11 with a majority of punched out 12 formed pole teeth 13 and a plurality of in the through the cutouts 12 formed channels arranged permanent magnets 14 on. The (in 1 not shown) stator 2 facing surface of the rotor core 11 is through between the pole teeth 13 arranged webs 15 completely finished.

This will prevent from the permanent magnets 14 chipped particles can lead to a blockage of the engine. In the illustrated, belonging to an internal rotor motor rotor 1 is the stator 2 facing surface of the rotor core 11 the outer circumferential surface of the substantially cylindrical rotor 1 ,

The bridges 15 are in the middle areas 16 extending between the pole teeth 13 narrower than near the pole teeth 13 of the rotor core 11 , so that by the closed design of the rotor 1 occurring flow loss is as low as possible.

In 2 is the stator 2 represented the engine according to the invention.

The stator 2 has a stator lamination stack consisting of a plurality of mutually spaced Polzahnblechpaketen 21 is formed, whose interstices grooves 22 form. Between the Polzahnblechpaketen 21 ie in the grooves 22 the windings (not shown) are arranged.

Each Polzahnblechpaket 21 is assembled in a known manner from a plurality of sheets, but in contrast to known stator lamination form only one pole tooth.

The Polzahnblechpakete 21 are with their front sides between two Statorendscheiben 23 arranged and thereby connected to a laminated stator core, wherein the Statorendscheiben 23 Receiving means for positioning and fixing the Polzahnblechpakete 21 exhibit. The recording means 26 are by angled projections of Statorendscheiben 23 formed and each grip on the groove bottom forming surfaces of two adjacent Polzahnblechpakete 21 so that they are fixed in position.

One of the two stator end disks 23 has contact elements 24 for contacting the windings, by means of which the contacting of the stator windings on the end face of the stator 2 is possible with little effort.

The contact elements 24 are in the stator end disk 23 pressed. and designed such that the contact of the windings to the power electronics of the motor can be made by plugging, insulation displacement, welding or soldering.

The the rotor 1 the opposite surface of the laminated stator core is characterized by a sleeve packetized from annular individual sheets 25 completely finished. The sleeve 25 is pushed over the wound stator package.

The 3 shows the motor M in the assembled state and open to the front with the rotor 1 and the stator 2 , In 4 is the engine M in closed state shown.

1

rotor

11

Laminated core

12

punching

13

pole tooth

14

permanent magnet

15

web

16

middle Area

2

stator

21

Polzahnblechpaket

22

groove

23

stator end

24

contact element

25

shell

26

receiving means

M

engine

Claims (12)

Permanent-magnet motor, in particular EC motor, comprising a stator ( 2 ) and a rotor ( 1 ), wherein the stator ( 2 ) a laminated stator core ( 21 ) with a plurality of grooves ( 22 ) formed pole teeth and a plurality of in the grooves ( 12 ) arranged windings and the rotor ( 1 ) a rotor core ( 11 ) with a plurality of punctiformly arranged by centrally symmetrical ( 12 ) formed pole teeth ( 13 ) and a plurality of in the punched ( 12 ) arranged permanent magnets ( 14 ), characterized in that the punched-outs ( 12 ) are arranged so that the pole teeth ( 13 ) along the circumference of the rotor ( 1 ) by webs ( 15 ) are interconnected, so that the punched ( 12 ) Channels for receiving permanent magnets ( 14 ) and the stator ( 2 ) facing surface of the rotor core ( 11 ) is completely closed. Permanent-magnet motor according to claim 1, characterized in that the webs ( 15 ) in at least one middle area ( 16 ) are narrower than in the vicinity of the pole teeth ( 13 ) of the rotor core ( 11 ). Permanent-magnet motor according to one of the preceding claims, characterized in that the end faces of the rotor laminated core ( 11 ) are completely closed by Rotorendscheiben. Permanent-magnet motor according to one of the preceding claims, characterized in that the permanent magnets ( 14 ) in the of the punching ( 12 ) are glued, wherein the permanent magnets ( 14 ) are enveloped by adhesive. Permanent-magnet motor according to one of the preceding claims, characterized in that the stator laminated core has a plurality of pole-toothed laminated cores ( 21 ). Permanent-magnet motor according to one of the preceding claims, characterized in that the pole toothed lamination packs ( 21 ) with their end faces between two Statorendscheiben ( 23 ) are arranged and thereby connected to a laminated stator core, wherein the Statorendscheiben ( 23 ) Receiving means ( 26 ) for positioning and fixing the Polzahnblechpakete ( 21 ) exhibit. Permanent-magnet motor according to one of the preceding claims, characterized in that the receiving means ( 26 ) by angled projections of Statorendscheiben ( 23 ) are formed, each over the groove bottom forming surfaces of two adjacent Polzahnblechpakete ( 21 ) to grab. Permanent-magnet motor according to one of the preceding claims, characterized in that the stator end disks ( 23 ) are produced by at least partially encapsulating the Polzahnblechpakete with a sprayable plastic. Permanent-magnet motor according to one of the preceding claims, characterized in that at least one stator end disk ( 23 ) Contact elements ( 24 ) for contacting the windings. Permanent-magnet motor according to one of the preceding claims, characterized in that the contact elements ( 24 ) into the stator end disk ( 23 ) are pressed. Permanent-magnet motor according to one of the preceding claims, characterized in that the contact elements ( 24 ) are formed such that the contact of the windings to the power electronics of the motor by plugging, insulation displacement technology, welding or soldering can be produced. Permanent-magnet motor according to one of the preceding claims, characterized in that the rotor ( 1 ) facing away from the stator lamination stack through a sleeve ( 25 ) is completely completed.