Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2706—Inner rotors
  • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
  • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
  • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
  • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets

Definitions

• the present invention relates to the positioning and mounting of permanent magnets in spoke rotors of brushless permanent magnet electrical machines.
• Electric machines with a brushless inner rotor designed as a spoke rotor are used in a variety of applications. Examples are electric power steering systems (EPS, Electric Power Assisted Steering Drive), drives for the cooling circuit of internal combustion engines, vehicle drives for electric scooters or bicycles
• EPS Electric Power Assisted Steering Drive
• the rectangular permanent magnets are arranged as the spokes of a bicycle. They therefore extend along their length in the axial direction of the rotor, along their width in the radial direction, and along their depth into the tangential
• Rectangular permanent magnets are simple and inexpensive to produce. Another advantage is that an air gap between such a rotor, in the following spoke rotor, and a this um- yielding magnetic flux density is higher than the remanent flux density of the permanent magnets used. The torque density of these spoke rotors is correspondingly high.
• a large number of permanent magnets is used whose radial width is greater than half the thickness of the pole pieces arranged between the permanent magnets in the circumferential direction.
• permanent magnets for both rare earth-free permanent magnets such as sintered ferrites, which have a relatively low remanent magnetization, or rare earth permanent magnets, such as sintered neodymium-iron-boron (NdFeB) - permanent magnets, with high
• a well-known problem of spoke rotors is the positioning and attachment of the permanent magnets in the main body of the rotor. Due to manufacturing tolerances and to allow the insertion of the permanent magnets in their recording, the dimensions of the images must be greater than the outer dimensions of the permanent magnets. The difference is typically several tenths of a millimeter, often about 0.2mm. In order for the permanent magnets during the life of the electrical machine vibration or other mechanical stresses, for example, when changing direction during operation of the machine or similar, withstand, they must be permanently fixed in position.
• the permanent magnets are uniformly positioned in the tangential direction. Because uneven positioning has the consequence that the permanent magnets abut against different tangential side surfaces of the pole limiting their recording, so that some of the permanent magnets rest on the left side of their recording and others on the right side of their recording. This is the field profile of the magnetic field in the rotor slightly uneven, resulting in an increased cogging torque and increased torque ripple. The concentricity behavior and the control behavior of such an electric machine are also poor.
• the permanent magnets are glued, for example, in their recording.
• the disadvantage of this is that they must be kept in position during curing, so that the production time for the
• Spoke rotor is very long. A defined positioning in the tangential direction can not be ensured with this method of attachment. And the presence of adhesives during the manufacturing process is expensive in terms of the required cleaning of the manufacturing tools.
• the permanent magnets are positioned in their receptacle and attached by injecting a thermoplastic, a thermoset or other plastic. But even with this method, a defined tangential positioning of the permanent magnets is not guaranteed.
• the permanent magnets are held in position by means of a non-magnetic steel tube or a reinforced plastic tube.
• the tube increases the air gap width and decreases thereby the torque density.
• no defined tangential positioning of the permanent magnets is possible.
• Permanent magnets is hampered by the second clamping nose.
• the object of the present invention is to further improve a spoke rotor, so that it can be produced very inexpensively, the permanent magnets are easily fastened in the rotor, and permanently positioned and fixed in both the radial and in the tangential direction, so that an electric machine with such a spoke rotor has very small cogging torques and a very low torque ripple.
• a spoke rotor for an electric machine which has a base body which concentrically extends about an axis of rotation, and which has a plurality of pole pieces, between which permanent magnets are arranged in receptacles, wherein for each permanent magnet in its receptacle each at least one first clamping element and a second clamping element are provided, which fix it in its receptacle.
• the spoke rotor is characterized by the fact that the first clamping element fixes the permanent magnet in a radial direction to the axis of rotation, and the second clamping element fixes it in a tangential direction to the axis of rotation, wherein for each second clamping element in each case also a movement is provided free movement.
• clamping elements are provided either for the radial fixation or for the tangential fixation, their clamping action, in particular their clamping direction and their clamping force, is better adjustable.
• the permanent magnets are better placed with these clamping elements.
• the clamping force with which the permanent magnets are pressed in each case in the radial and tangential direction very precisely and uniformly adjustable.
• clamping elements in such a way that, in addition to the radial or tangential fixation, they also bring about an axial fixation of the permanent magnet in the receptacle.
• each second clamping element movement clearance is used to equalize the space for the respective second clamping element when inserting the permanent magnet into the receptacle. Therefore, the second clamping element yields after insertion of the permanent magnet in the insertion direction. Depending on the design of the second clamping element, it is in the direction of insertion into the movement clear cavities in, or bent along this. This is the permanent magnet easier to insert into his recording.
• the clamping element can be formed and dimensioned so that the permanent magnet thereby, in particular its surface or coating, not damaged, in particular scratched, is.
• the movement clear cavities formed by a recess in one of the recording of the permanent magnet limiting pole piece, and seen in the insertion direction of the permanent magnet in the spoke rotor behind the second clamping element.
• Clamping element formed in the insertion arcuate Preferably, they are formed half-wave or wave-shaped, so that the permanent magnet slides during insertion into its receptacle each along an arcuate contact surface of the first and second clamping element. Since the contact surface is arc-shaped, the permanent magnet can not be scratched during insertion. It is preferred that the clamping elements of this embodiment when inserting the permanent magnets on the main body of the
• the second clamping element is supported in the movement-free space at the this limiting outer surface of the pole piece.
• the base body has a, in particular web-shaped, support element, on which this is supported.
• the first clamping element when the permanent magnet is not inserted into the receptacle, the first clamping element extends in the radial direction to the axis of rotation and the second clamping element in the tangential direction to the axis of rotation into the receptacle. It is preferred that the second clamping element of this embodiment is arranged sunk in the pole piece. This makes it longer and smoother executable. In addition, the for the second clamping element required height thereby lower.
• Clamping elements of this embodiment are preferably bent during insertion of the permanent magnet in the insertion direction. When inserted into the receptacle permanent magnet they are therefore bent in the insertion direction. For the movement space for the second clamping elements is provided. Damage to the permanent magnet during insertion into its receptacle is avoided by the bending of the clamping elements.
• the clamping elements are bent during insertion of the permanent magnet in its recess against its clamping force. As a result, they have their final shape only when added to his recording permanent magnet. They also push the permanent magnet with its clamping force in its position.
• first and second clamping elements are provided in the spoke rotor for each permanent magnet.
• the clamping force of the individual clamping elements can each be made smaller.
• the number of first and second clamping elements in the spoke rotor is preferably the same for each permanent magnet. It is preferably in the range 2-10, more preferably in the range 4 - 8.
• Permanent magnets equal number of first and second clamping elements Symmetriecons and thereby caused problems are avoided.
• the number of clamping elements with which a permanent magnet is fixed in its receptacle is preferably determined as a function of the size of the permanent magnet and the requirement for the clamping force of the clamping elements.
• the second clamping elements are all arranged on the same (first) side of the pole pieces.
• the permanent magnets are all aligned in the same tangential direction. Namely, they are pressed against the (first) side opposite (second) side of the recess.
• the cogging torques of such an electric machine, and consequently its torque ripple, are very small.
• the spoke rotor is made in a preferred embodiment of a solid material. But it is particularly preferred that it is made as a plate pack of a plurality of lamellae.
• the lamellae are preferably connected to one another by means of gluing, baked enamel, punching knobs and / or rivets to form a lamella packet, and joined together onto a shaft, or else they are preferably individually joined to the shaft.
• the pole shoes are arranged distributed uniformly in the tangential direction, so that even the permanent magnets arranged in the receptacles between the pole shoes are arranged distributed uniformly in the tangential direction.
• the lamellae of the spoke rotor have a symmetrical construction. With particular preference they are surface or point symmetrical. Compared to an asymmetrical structure thereby
• a spoke rotor manufactured as a disk pack preferably has a base body which is made of a plurality of fins, wherein the first and second clamping elements are always arranged in each case on a clamping blade. It is particularly preferred that the spoke rotor of this embodiment also has at least one compensating lamella for each clamping lamella, which is arranged behind the clamping lamella in the insertion direction and on which a recess for forming the movement clearance is arranged for each second clamping element of the clamping lamella. Such a spoke rotor can be produced both manually and automatically very inexpensively. At the clamping lamella of this spoke rotor, a first and a second clamping element are preferably always provided for permanent magnets distributed uniformly in the tangential direction.
• a first and a second clamping element are provided on a clamping blade of this spoke rotor for all permanent magnets.
• the spoke rotor of this embodiment can be manufactured so that the distribution of the first and second clamping elements for all permanent magnets is the same. Due to the great symmetry of this spoke rotor, it has only very small imbalances, a low torque ripple and a small cogging torque.
• the clamping blade is made in a preferred embodiment of a ferromagnetic metal or a metal alloy with ferromagnetic properties, in particular of a soft magnetic
• the clamping blade is made of spring steel.
• the pole shoes of the spoke rotor are preferably at least partially connected to one another by a transverse web, which is arranged in each case on the side of the receptacles facing away from the axis of rotation.
• the pole shoes are connected by a longitudinal web to an inner ring of the main body, in which a through-bore for a shaft is centrally provided. It is preferred that all of the pole pieces have a connection with the inner ring, either directly over the longitudinal bar or indirectly over the transverse bar, so that the pole pieces are positioned in the spoked rotor in a defined manner and the slats are mechanically stable.
• at least some of the pole shoes are not connected to one another by a transverse web.
• the spoke rotor according to the invention is both manually and automatically produced very inexpensively.
• the permanent magnets are aligned in the same tangential direction and securely fixed in the radial direction in their recording.
• the clamping elements are so dimensioned and / or shaped that the permanent magnets are not damaged when inserted into their recording.
• the spoke rotor has a very uniform magnetic field distribution, through which the cogging torque is very small and the
• the clamping blade has a plurality of pole pieces, between which are formed receptacles for permanent magnets, which can be inserted in an insertion direction into the receptacles.
• it has in at least one receptacle on a first clamping element and a second clamping element, which are provided for fixing a permanent magnet inserted into the receptacle.
• the clamping blade is characterized in that the first clamping element is provided for fixing the permanent magnet in a radial direction, and the second clamping element for fixing the permanent magnet in a tangential direction. In addition, it is characterized by the fact that the first and the second clamping element extend arcuately in the insertion direction.
• the second clamping element allows the alignment of the permanent magnet in the tangential direction. Due to the arch shape is the insertion of the
• the clamping blade for each permanent magnet comprises a first and a second clamping element.
• all second clamping elements are arranged on the same side of the receptacles. As a result, the cogging torque is minimized.
• the first clamping element and the second clamping element of the clamping blade of this embodiment preferably extend arcuately in the insertion direction. Particularly preferably, they are formed half-wave or wave-shaped. As a result, they have on their sides facing the permanent magnet sides an arcuate contact surface, so that the permanent magnet is not damaged when inserted into its receptacle.
• the clamping blade is preferably made of spring steel. In this embodiment, with a few clamping blades a sufficiently large clamping force can be produced even for relatively large spoke rotors. Overall, a large spoke rotor is characterized with little effort and very inexpensive to produce.
• the object is further achieved with an electric machine, in particular with an electric motor, with such a spoke rotor.
• the electric machine is preferably brushless. In a preferred embodiment, it is a synchronous machine.
• the electric machine has a small cogging torque and a low torque ripple.
• the permanent magnets of the rotor are fixed by means of clamping elements very inexpensive in the rotor, so that the electrical machine is overall very inexpensive to produce. It is for example an electric motor, a starter, a generator or an auxiliary drive, in particular an adjustment drive for motor vehicles.
• the object is achieved with a device, in particular with a hand tool, an adjustment drive for a motor vehicle, a power steering, a servomotor, an electromechanical brake booster, or a vehicle drive, in particular for an e-scooter or an eBike, with such an electric machine. Due to the low
• Torque ripple of the electric motor caused by the torque ripple of the electric motor running noise of the device is very low.
• Fig. 1 shows a section through an electric machine after
• FIG. 2 shows in (a) a first embodiment of a clamping lamella for a spoke rotor according to the invention of an electric machine, in (b) a compensation lamella for the spoke rotor from (a), in (c) a conventional lamella for the spoke rotor from (a), in (d) the main body of the spoke rotor from (a), in (e) the spoke rotor from (a), in (f) a first sectional image along the line LA through the spoke rotor from (e), and in (g) a second one Cross-sectional view along the line LB through the spoke rotor from (e), and
• FIG. 3 shows in (a) a second embodiment of a clamping lamella for a spoke rotor according to the invention of an electric machine, in (b) a spacer lamella for the spoke rotor from (a), in (c) a compensation lamella for the spoke rotor from (a), in FIG (d) a conventional lamella for the spoke rotor of (a), in (e) the main body of the spoke rotor from (a), in (f) the spoke rotor from (a), in (g) a first sectional image along the line LA through the spoke rotor from (f), and in (h) a second one Cross-sectional view along the line LB through the spoke rotor from (f).
• the electric machine 100 of Fig. 1 has an inner rotor 10 which is designed as a spoke rotor and concentrically extends around a shaft 20 which is rotatably mounted about a rotation axis 2 (see Fig. 2, 3). In addition, it has an externally arranged stator 50.
• the stator 50 has a yoke 53 on which a plurality of teeth 52 are arranged.
• the teeth 52 are wound with a winding 54 which is provided for generating an alternating magnetic field.
• 52 spaces 51 for receiving the winding 54 are provided between the teeth.
• only one winding 54 is shown by way of example for the sake of clarity.
• the spoke rotor 10 has an inner ring 71, which extends concentrically around the axis of rotation 2 and centrally has a through hole 77 (see Fig. 2, 3), which is provided for receiving the shaft 20. In addition, it has a multiplicity of pole shoes 72, between which receptacles 3 (see FIGS. 2, 3) for permanent magnets 4 are arranged. In the pictures 3 permanent magnets 4 are joined.
• the pole pieces 72 are connected to the inner ring 71 by means of longitudinal webs 78, which extend in a radial direction 21 to the axis of rotation 2.
• Holding lugs 79 are arranged on the pole shoes 72 and extend in or against a tangential direction 22 to the axis of rotation 2.
• the retaining lugs 79 each form a stop for the permanent magnets. 4 Between the spoke rotor 10 and the stator 50, an air gap 60 is formed.
• Such an electric machine 100 is a brushless permanent magnet synchronous machine.
• FIG. 2 shows a first embodiment of a spoke rotor 10 for such an electric machine 100.
• the spoke rotor 10 has a main body 1, which is made as a disk set of a plurality of fins 1 1, 12, 13.
• Fig. 2 (a) shows a clamping blade 1 1 of the spoke rotor 10, Fig. 2 (b) a balancing blade 12 of the spoke rotor 10, and Fig. 2 (c) an intermediate blade 13 of the spoke rotor 10.
• Fig. 2 (d) the finished base body 1 is shown.
• FIGS. 2 (e) - (g) respectively show the spoke rotor 10 arranged in the main body 1
• the slats 1 1, 12, 13 are integrally formed as stamped parts, preferably made of a flat strip material.
• a conventional for lamellae of such rotors 10 used preferably einsenumbler, steel used, or spring steel.
• the other fins 12, 13 of the conventional steel is used.
• the clamping blade 1 1 has the inner ring 71 with the pole shoes 72 arranged on the inner ring 71.
• the inner ring 71 extends concentrically around the
• the center hole in the inner ring 71, the through hole 77 is provided for receiving the shaft 20.
• the pole shoes 72 are integrally connected to the inner ring 71 via longitudinal webs 78.
• the longitudinal webs 78 extend in the radial direction 21 to Rotation axis 2.
• Between the pole pieces 72 receptacles 3 for receiving the permanent magnets 4 are formed.
• the retaining lugs 79 extend in and against the tangential direction 22 to the rotation axis 2. They serve as a stop for the permanent magnet. 4
• first clamping elements 73 are arranged.
• the first clamping elements 73 extend in the radial direction 21. In the FIG. 2 (a) shown here, they are also bent in an axial insertion direction 23. This form take the first
• the first clamping elements 73 are provided for the radial fixation of the permanent magnets 4. In the embodiment shown here, in each case a first clamping element 73 is provided in each case for a receptacle 3.
• the pole shoes 72 each have a first side 721 and a second side 722. On their first side 721 they have a first outer surface 761. At their second side 722, they have a second outer surface 762.
• each pole piece 72 On the first side 721 of each pole piece 72, a second clamping element 74 is provided in each case.
• the second clamping elements 74 here extend against the tangential direction 22. In the FIG. 2 (a) shown here, they are also bent in the insertion direction 23. But even the second clamping elements 74 take this shape only when joined in their recordings 3 permanent magnet 4 a. In the unmounted state of the clamping blade 1 1 and the Base body 1, the second clamping elements 74 are therefore also not bent.
• the second clamping elements 74 are recessed in the pole piece 72. As a result, they are relatively long and yielding produce, while they protrude only slightly into the receptacle 3 into it.
• the second clamping elements 74 are provided for the tangential fixation of the permanent magnet 4. In the embodiment shown here, a second clamping element 74 is provided in each case for a receptacle 3 in each case.
• the balance blade 12 has a trained as a recess movement clear space 75.
• the freedom of movement 75 is respectively arranged on the first side 721 of the pole shoes 72.
• the construction of the compensating lamella 12 essentially corresponds to that of the clamping lamella 11.
• the compensating blade 12 also has the inner ring 71 with the pole shoes 72 arranged on the inner ring 71. Also in her pole shoes 72 are integrally connected via longitudinal webs 78 to the inner ring 71. In addition, their pole pieces 72 also have the retaining lugs 79 as a stop for the permanent magnets 4. However, in contrast to the clamping lamella 1 1, the compensating lamella 12 has no first clamping elements 73 on its side of the inner ring 71 facing the receptacle 3.
• one or more compensation lamellae 12 are arranged behind the clamping lamella 1 1. It is or are the movement space 75 forming recesses behind the second clamping elements 74 of the clamping blade 1 1, and the inner ring 71 and the pole pieces 72 of the compensating blade 12 or the compensating blades 12 otherwise flush with the inner ring 71 and respectively the first side 721 of the pole pieces 72 of the clamping blade 1 1 arranged.
• this also has intermediate fins 13.
• the intermediate blades 13 also have the structure of the clamping blade 1 1 and the compensating blade 12. They also have the inner ring 71 with the pole ring 72 arranged on the inner ring 71.
• the pole pieces 72 are also integrally connected via longitudinal webs 78 with the inner ring 71. In addition, their pole pieces 72 also have the retaining lugs 79 as a stop for the permanent magnets 4.
• pole shoes 72 of the intermediate plates 13 have neither a recess used as a movement clearance 75 nor a first or second one
• the pole shoes 72 of the intermediate blades 13 are therefore to a fictitious by the longitudinal webs 78 extending axis (not shown) in each case surface symmetrical.
• they have in comparison to the clamping blade 1 1 also no first clamping elements 73 on its side facing the receptacle 3 of the inner ring 71.
• one or more intermediate lamellae 13 are arranged in front of a clamping lamella 1 1 or after a compensation lamella 12.
• the base body 1 of FIG. 2 (d) formed as a disk set of the clamping disks 1 1, compensating disks 12 and intermediate disks 13 formed in FIGS. 2 (a) - (c) has in each case six clamping disks 1 1. These are arranged one behind the other in the insertion direction.
• the clamping plates 1 1 each have a first clamping element 73 and a second clamping element 74 for each receptacle 3.
• the first clamping elements 73 are each at one of the receptacles. 3 arranged facing side of the inner ring 71 and provided for fixing the inserted into the receptacle 3 permanent magnets 4 in the radial direction 21.
• the second clamping elements 74 are each arranged on the first side 721 of one of the two pole piece 72 delimiting the receptacle 3, and are provided here against the tangential direction 22 for fixing the permanent magnet 4 inserted in the receptacle 3. They are also arranged one behind the other in the insertion direction 23.
• a permanent magnet 4 is disposed in a receptacle 3, respectively.
• the first clamping elements 73 press the permanent magnet 4 in the radial direction 21 against the retaining lugs 79. This is in the sectional view of Fig. 2 (g) visible.
• the second clamping elements 74 press the permanent magnet 4 against the tangential direction 22 against the second outer surface 762 of the adjacent pole piece 72. This is visible in the sectional view of FIG. 2 (f).
• the second clamping lug 74 is bent when arranged in their recording 3 permanent magnet 4 in the movement clearing 75 in space.
• FIG. 2 (f) shows that the movement clearances 75 of the compensating lamellae 12 are arranged in alignment behind the second clamping elements 74 of the clamping lamella 11. The remaining lamellae of this spoke rotor 10 are intermediate lamellae 13.
• FIG. 3 shows a second embodiment of a spoke rotor 10 for such an electric machine 100.
• the spoke rotor 10 of this embodiment also has a base body 1, which is made as a disk set of a plurality of fins 1 1, 12, 13, 14.
• this base body 1 the clamping plate 1 1, the compensating blade 12 and the intermediate plate 13.
• a spacer blade 14 is preferably also used here.
• FIG. 3 (a) shows the clamping blade 1 1 of the spoke rotor 10, Fig. 3 (b) the compensating blade 12, and Fig. 3 (c) the intermediate blade 13 and Fig. 3 (d) the spacer blade 14.
• Fig. 3rd (e) the finished base body 1 is shown.
• FIGS. 3 (f) - (h) respectively show the spoke rotor 10 with permanent magnets 4 arranged in the main body 1.
• the slats 1 1, 12, 13, 14 are integrally formed as stamped parts, preferably made of a flat strip material.
• spring steel is used for the clamping blade 1 1 here.
• a conventional steel used for lamellae is used for the other fins 12, 13, 14, a conventional steel used for lamellae is used.
• the clamping blade 1 1 has the inner ring 71 with the pole ring 72 arranged on the inner ring 71.
• the inner ring 71 extends concentrically around the axis of rotation 2. It also has a through hole 77 'in the middle, but has a considerably larger diameter 77' than the through-holes 77 of the compensating lamella 12 and the intermediate lamella 13 of this spoke rotor 10 used as a shaft receiver.
• the pole shoes 72 are integrally connected to the inner ring 71. In contrast to the spoke rotor 10 of FIG. 2 but here are no longitudinal webs 78 on the Clamping plate 1 1 provided. Between the pole pieces 72, the receptacles 3 for receiving the permanent magnets 4 are formed.
• the first clamping elements 73 are arranged.
• the first clamping elements 73 extend arcuately in the insertion direction 23. They have approximately the shape of a half-wave.
• the first clamping elements 73 are provided for the radial fixation of the permanent magnets 4. Also in this embodiment of the clamping blade 1 1, a first clamping element 73 is provided in each case for a receptacle 3 each.
• a second clamping element 74 is provided on the first side 721 of each pole piece 72.
• the second clamping elements 74 extend arcuately in the insertion direction 23. They also have approximately the shape of a half-wave.
• the second clamping elements 74 are provided for the tangential fixation of the permanent magnet 4.
• a second clamping element 74 is provided in each case for a receptacle 3.
• the pole shoes 72 each have a first
• the second clamping elements 74 are all arranged on the first side 721 of the pole shoes 72. It can be seen that a first distance A1 of the first clamping element 73 from the first side 721 of the first pole piece 72 delimiting its receptacle 3 is smaller than a second distance A2 of the first clamping element 73 from the second side 722 of the second pole piece 72 bounding its receptacle 3 ,
• an outer distance H1 of the pole shoes 72 of the clamping blade 1 1 from the axis of rotation 2 is shorter than an outer distance H2 of the pole shoes 72 of the pole piece.
• the spacer blade 14 can be arranged on the clamping blade 1 1, which is made of spring steel, which is made of the steel used for conventional lamellae.
• a positioning means 723 is provided on each pole piece 72, with which the spacer blade 14 can be positioned on the clamping blade 1 1 of this embodiment.
• the positioning means 723 is here a recess.
• the spacer blade 14, in contrast, has a counter positioning means
• the bulge 723 ' which is designed as a recess 723' corresponding to the indentation 723.
• the bulge 723 ' here has the shape of a web.
• the web 723 ' engages in an assembled state of the spacer blade 14 to the clamping blade 1 1 in the recess 723 a. It is arranged on a concentrically arranged about the rotation axis 2 outer ring 791. In the area of the receptacles 3, the outer ring 791 in each case forms a transverse web (not designated).
• the outer ring 791 has a height H which is the difference between the first outer distance H1 of the pole pieces 72 of the clamping blade 1 1 and the second
• a pole shoe element 72 ' is arranged on the outer ring 791 for each pole shoe 72 of the clamping blade 1 1.
• the pole piece 72 ' In the mounted state of the spacer blade 14 to the clamping blade 1 1, the pole piece 72 'is located with a side facing the pole piece 762' on the second side 762 of the pole piece 72 of the clamping plate 1 1.
• a width of the pole shoe element 72 'of the spacer blade 14 is preferably equal to the difference between the first distance A1 of the one, the receptacle 3 each bounding pole piece 72 to the first terminal element 73 and the second distance A2 of the other, the receptacle 3 each bounding pole piece 72 to the first clamping element 73rd
• the permanent magnet 4 inserted into the receptacle is thus pressed with the second clamping element 74 on a side 762 "of the pole shoe element 72 'of the spacer blade 14 facing away from the pole piece.
• the outer ring 791 of the spacer blade 14 has several advantages: In the mounted base body 1, the pole shoes 72 are connected to one another via the outer ring 791 of the spacer blade 14. As a result, the pole shoes 72, in particular the clamping blade 1 1, better positioned tangentially. In addition, the outer ring 791 gives the main body 1 a greater rigidity and mechanical robustness. This is especially advantageous during transport, assembly and handling of the spoke rotor.
• the main body 1 of this embodiment also has the compensating blade 12. This also has the recess formed as a free space 75.
• the freedom of movement 75 is also arranged here on the first side 721 of the pole shoes 72.
• the compensating blade 12 of this embodiment has the inner ring 71 with the pole shoes 72 arranged on the inner ring 71. But in contrast to the clamping blade 1 1 of this embodiment, the pole pieces 72 are integrally connected via longitudinal webs 78 with the inner ring 71. In addition, the pole shoes 72, the retaining lugs 79 as contact surfaces for the permanent magnets 4.
• This compensating lamella 12 also has no first clamping elements 73 on the side of the inner ring 71 facing the receptacle 3. In terms of their shape, the compensating lamella 12 therefore essentially corresponds to that of the compensating lamella 12 of the embodiment of FIG. 2.
• a web-shaped support element 713 is provided on the side facing the receptacle 3 71 1 of the inner ring 71 here in contrast to the embodiment of FIG. 2, on which the first clamping element 73 is supported.
• the main body 1 of this embodiment also includes the intermediate plate 13. These also corresponds approximately to the intermediate plate 13 of FIG. 2.
• the pole pieces 72 are also integrally connected via longitudinal webs 78 with the inner ring 71.
• their pole pieces 72 also have the retaining lugs 79 as contact surfaces for the permanent magnets 4.
• the pole pieces 72 of this intermediate plate 13 likewise have neither a recess used as a movement clearance 75 nor a first or second clamping plate 73, 74. They are therefore also to a fictitious by the longitudinal webs 78 extending axis (not shown) in each case surface symmetrical.
• the intermediate blade 13 of FIG. 3 analogous to the compensating blade of FIG. 3, the web-shaped support member 713 on which the first clamping element 73 is supported.
• the assembled base body 1 is also here or a plurality of compensating blades 12 are arranged in the insertion direction 23 behind the clamping blade 1 1.
• the or are the movement clearing 75 forming recesses in the insertion direction 23 behind the second clamping elements 74 of the clamping blade 1 1 is arranged.
• the inner ring 71 and the pole shoes 72 of a compensating blade 12 or the plurality of compensating blades 12 are otherwise arranged flush with the inner ring 71 and the first side 721 of the pole shoes 72 of the clamping blade 1 1.
• the clamping plates 1 1 each have a first clamping element 73 and a second clamping element 74 for each receptacle 3.
• the first clamping elements 73 are each arranged on a side facing the receptacles 3 of the inner ring 71 and provided for fixing the inserted into the receptacle 3 permanent magnets 4 in the radial direction 21.
• the second clamping elements 74 are each arranged on the first side 721 of one of the two pole shoes 72 bounding the receptacle 3, and are provided here against the tangential direction 22 for fixing the permanent magnet 4 inserted in the receptacle 3. They are also arranged one behind the other in the insertion direction 23.
• a permanent magnet 4 is arranged in each case a receptacle 3.
• the first clamping elements 73 press the permanent magnet 4 in the radial direction 21 against the retaining lugs 79. This is in the sectional view of Fig. 2 (h) visible.
• the second clamping elements 74 press the permanent magnet 4 against the tangential direction 22 against the second outer surface 762 of the adjacent pole shoe 72 and the pole shoe element 72 'of the spacer blade 14. This is in the sectional view of FIG. 3 (g) visible.
• the second clamping member 74 is supported in the receiving 3 arranged permanent magnet 4 in the movement clear space 75.
• FIG. 3 (g) also shows that the movement clearances 75 of the compensating lamellae 12 are arranged in the insertion direction 23 behind the second clamping elements 74. They are dimensioned sufficiently long in the axial insertion direction 23. As a result, the second clamping element 74 is in contact with the pole piece 72 even after the deformation has occurred despite the deformation of the permanent magnet 4 into its receptacle 3.
• Electric machines with such spoke rotors 10 have pole pairs with largely identical magnetic field characteristics, in particular in the air gap 60. As a result, their cogging torque is very low.

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• 2013
  • 2013-12-18 DE DE102013226379.1A patent/DE102013226379A1/de active Pending
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