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
  • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
  • H02K1/246—Variable reluctance rotors
• • 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
  • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
  • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
  • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
  • H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped poles
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K19/00—Synchronous motors or generators
  • H02K19/02—Synchronous motors
  • H02K19/10—Synchronous motors for multi-phase current
  • H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K19/00—Synchronous motors or generators
  • H02K19/02—Synchronous motors
  • H02K19/14—Synchronous motors having additional short-circuited windings for starting as asynchronous motors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
  • H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew

Definitions

• Rotor for a reluctance motor in particular a synchronous reluctance motor, method for producing such a rotor
• the invention relates to a rotor for a reluctance motor, in particular a synchronous reluctance motor, according to the preamble of claim 1, a method for producing such a rotor according to the preamble of claim 17 and a reluctance motor with such a rotor according to claim 19.
• variable speed drives for applications are interesting, which have been operated mainly for cost reasons so far with mains frequency-dependent fixed speeds.
• fans are designed for the cooling area on the required peak load, but operated mainly in the partial load range.
• the achievable efficiencies are lower depending on the type of electric motors used for the fans than in the design point.
• CONFIRMATION COPY The disadvantage, however, is that the necessary permanent magnet materials can only be used for narrow temperature ranges. In addition, the cost situation, especially for high-performance materials such as neodymium-iron-boron, is very uncertain and tends to be high due to the high demand worldwide. Another disadvantage is that the assembly processes, such as the bonding and the magnetization of the magnets, require special care and thus deliver a not insignificant contribution to the cost manufacturing.
• Reluctance motors operate completely without magnets, distinguishing between switched reluctance motors and synchronous reluctance motors.
• Switched reluctance motors have a high, inherent torque ripple. It can be reduced by the synchronous reluctance motors to a level comparable to permanent-magnet motors.
• the reluctance motor operates with a conventional multi-phase distributed winding or a polyphase tooth coil winding.
• the multipole magnetic field generated by the stator winding exerts magnetic attraction forces on a rotor, which only depends on the number of poles of the stator. gate has an even number of magnetic characteristics.
• the magnetic characteristics of the rotor align themselves in the direction of the rotating stator field, so that the rotor runs synchronously with the poles of the stator field.
• Due to the reluctance (magnetic conductivity) forces are generated by each pole pair in the preferred directions predetermined by the magnetic characteristics, which effects a synchronous movement between the field of excitation of the stator and the characteristics of the rotor.
• Known reluctance motors have rotor segments made of magnetically conductive material, which are held in a base body of the rotor shell from less well magnetically conductive material.
• the synchronous operation is impaired by harmonics of the exciter flux or by load-dependent pendulum moments, which lead to flux changes in the rotor segments. This impairs the synchronism of such reluctance motors.
• the invention has the object of providing the generic rotor, the generic method and the generic reluctance motor in such a way that the rotor can be easily and inexpensively manufactured and manufactured, and that with him a good synchronization of the reluctance motor is guaranteed.
• the rotor segments are embedded in a base body so that it completely covers the rotor segments inside or outside.
• the main body forms in this way a closed jacket on the inside or on the outside of the rotor.
• the rotor with a closed circumferential jacket on the inside can be used for an internal rotor motor and with a closed circumferential jacket on the outside for an external rotor motor.
• the main body gives the rotor a high strength and stability.
• the main body may consist of plastic.
• plastic In this case, to form the short-circuit winding, it is necessary to use a correspondingly conductive additional material.
• the main body may in an advantageous embodiment also consist of metallic material, in particular aluminum. Then the rotor can be manufactured in a well-proven die-cast aluminum. In such a design, the metallic material serves not only for the formation of the body, but at the same time for the realization of the magnetic flux stabilization.
• the rotor segments may consist of a one-piece sheet metal.
• the rotor segments of layered laminations are placed on each other and connected in a suitable manner, for example, glued.
• the longitudinal center plane of the rotor segment viewed transversely to the axis of the rotor, forms an angle with the axial plane of the rotor.
• the rotor segments are advantageously designed so that the longitudinal edges of the rotor segment parallel to the longitudinal center plane of the rotor segment, viewed transversely to the axis of the rotor.
• the rotor segments are advantageously located between two return rings.
• the magnetic flux lines run from the Return ring from opposite to each other in the rotor segments and the circumferentially adjacent rotor segment back to the return ring.
• each rotor segment associated with two magnetic flux circuits, of which one magnetic flux circuit via the one return ring and the other magnetic flux circuit via the opposite yoke ring runs.
• Such a design results in an excellent synchronization of the rotor equipped with the reluctance motor.
• a simple and cost-effective production of the rotor results when the return rings are detachably connected to the rotor segments, advantageously with screws.
• the screws are advantageously screwed into the narrow sides of the rotor segments, which lie flat against the yoke rings with these narrow sides. This results in a good transition of the magnetic flux lines from the rotor segments to the yoke rings.
• the return rings are annular and each lie in a radial plane of the rotor.
• a cap connects to a return ring, which is advantageously formed integrally with the return ring. With the cap, the rotor can be closed at one end.
• the cap is provided on the inside with a cover which consists of electrically conductive material.
• the cover is formed integrally with the base body.
• the rotor segments are formed integrally with a rotor bottom.
• the rotor segments can be punched with the rotor bottom in a simple manner from a sheet.
• the transition region from the rotor bottom to the rotor segments at least one short-circuit winding is provided.
• the training may be such that all rotor segments have a common short-circuit winding. It is annular in this case.
• each rotor segment has its own short-circuit winding in the transition region.
• a sheet metal from which a star-shaped green body is punched is used as the starting material for producing the rotor segments.
• the arms of this green body are then bent out of the plane of the green body relative to a central piece connecting them to form the rotor segments.
• the rotor segments can be easily and inexpensively produced by a punching process.
• the integrally formed with the rotor bottom Ro- Gate segments are then held by the material of the body.
• a Kunststoffumspritzung the rotor segments and the rotor base or an aluminum die-casting process can be used.
• the rotor segments are to consist of layered laminations, several star-shaped raw bodies are punched from a sheet, which are then placed one on top of the other and connected in a suitable manner. The arms of the layered green body thus formed are then bent out of the plane of this green body to form the rotor segments.
• the outline shapes of the individual green bodies differ slightly in size, so that during the bending process, the rotor segments have a desired uniform outline shape.
• the reluctance motor according to the invention with the rotor is characterized by a very good synchronization.
• motor efficiencies can be achieved comparable to those of permanent magnet synchronous motors.
• the reluctance motor does not require permanent magnets.
• the stator corresponds to that of a conventional asynchronous motor. The robustness and temperature sensitivity are comparable to those of an asynchronous motor.
• FIG. 1 is a perspective view of a rotor according to the invention, which is used for an external rotor motor,
• FIG. 3 is a radial section through the rotor of FIG. 1,
• FIG. 4 shows the magnetic flux within the rotor according to FIG. 1, FIG.
• FIG. 13 is a perspective view of a second embodiment of a rotor according to the invention for an external rotor motor
• FIG. 15 is a perspective view of a third embodiment of a rotor according to the invention for an external rotor motor
• FIG. 17 is a perspective view of molded rotor laminations of the rotor according to FIG. 15, FIG. FIG. 18 shows a further embodiment of shaped rotor laminations for the rotor according to FIG. 15, FIG.
• FIG. 20 shows a further embodiment of a rotor according to the invention in a radial section for an external rotor motor
• FIG. 21 is a perspective view of another embodiment of a rotor according to the invention for an external rotor motor
• FIG. 22 shows the rotor according to FIG. 21 in another perspective illustration
• FIG. 23 is a schematic representation of the course of the magnetic flux in FIG.
• FIG. 24 shows an axial section through the rotor according to FIGS. 21 to 23, FIG.
• FIG. 25 shows an axial section through a further embodiment of a rotor according to the invention for an internal rotor motor.
• the rotors described below are used for reluctance motors, in particular for synchronous reluctance external rotor motors.
• the rotors have circumferentially spaced regions of high and low magnetic conductivity.
• the structure of the rotors is designed so that in the circumferential direction alternately magnetically good or
• Fig. 1 shows a rotor for an external rotor reluctance motor with a cylindrical shell 1, which merges at one end into a bottom 2. At the the other end, the jacket 1 is open. The bottom 2 is provided centrally with a bush-shaped projection 3, in which one end of a rotor shaft 4 is fixed. Its other end is equal to the front side 5 of the shell. 1
• the jacket 1 has a main body 6, which consists of a material having a low magnetic conductivity, for example of plastic or aluminum.
• the outside of the main body 6 forms the outer closed lateral surface 7 (FIG. 3).
• In the inside 8 of the base body 6 there are four recesses 9, which are formed equal to each other and arranged at angular intervals of, for example, 90 ° in a four-pole engine variant to each other.
• the recesses 9 each have a part-circular in the radial section bottom 10 which is formed symmetrically to the respective axial plane 1 1 of the rotor. Between adjacent recesses 9 remain axially extending webs 12 whose end face is located in the inner side 8 of the shell 1.
• rotor segments 13 which consist of good magnetic good conducting material, in particular iron, steel and the like.
• the rotor segments 13 are designed so that they lie flat against the bottom 10 of the recesses 9 and their rotor shaft 4 facing inner sides 14 are in the inner side 8 of the shell 1.
• the main body 6 is produced in the production of the rotor by a plastic injection molding or by an aluminum die-casting process.
• the rotor segments 13 are thereby firmly embedded in the base body 6.
• FIGS. 5 to 12 show different configurations of the rotor segments 13.
• the rotor segment 13 according to FIGS. 5 and 9 corresponds to the rotor segment according to FIG. 3. It consists of identical, superimposed sheet metal parts 13 ', which are connected to each other in a suitable manner.
• the sheet metal parts 13 ' for example, from a sheet, which is unwound from a coil punched.
• the sheet metal parts 13 ' are in radial planes of the rotor.
• the sheet metal parts 13 ' are each provided with a part-circular recess 15. It is in all sheet metal parts 13 'in half the width of the respective sheet metal part.
• the stacked sheet metal parts 13 ' thus form an axially extending groove 15 which is arranged symmetrically to the associated axial plane 1 1 of the rotor (Fig. 3).
• These grooves 15 are filled with an electrically conductive material (Fig. 1). If the base body 6, for example, aluminum, then the material located in the grooves 15 is also aluminum. Since the grooves 15 of the rotor segments 13 are open at both ends, the material in the depressions 15, webs 15 'forming material is formed integrally with the remaining part of the base body 6.
• the grooves 15 may also be provided obliquely to keep the Nutrastmomente low.
• the base body 6 consists of non-magnetically conductive material, e.g. made of plastic, then 15 electrically conductive material are introduced into the grooves and provided on the top and bottom of the rotor segments 13 shorting rings, to which the conductive material is connected in the grooves and which are embedded in the base body 6.
• the rotor segment 13 is formed from individual, successively lying in the radial direction sheet metal parts 13 ', which lie flat against each other and in a suitable manner, for example by gluing, are firmly connected.
• the recesses 15 also have part-circular outline and are filled with conductive material.
• the rotor segments 13 of the embodiments according to FIGS. 5 and 6 or 9 and 10 taper continuously, starting from the transverse center plane, in the circumferential direction.
• the rotor segments therefore have at their two side edges 16, 17, the smallest width.
• the side edges 16, 17 each have a flat end face 18, 19, with which the rotor segments 13 abut against corresponding flat side surfaces 20, 21 (FIG. 3) of the depressions 9.
• These side surfaces 20, 21 form the side surfaces of the webs 12 between adjacent recesses.
• the sheet metal parts 13 'of the embodiment according to FIGS. 5 and 9 lie in radial planes of the rotor. In the embodiment of FIGS. 6 and 10, however, only the inner side 14 of the rotor segment 13 is continuously curved, while the outer side 22 due to the radially consecutive sheet metal parts 13 ' is designed step-shaped. However, since the rotor segment 13 is embedded in the base body 6, this design of the outer side 22 of the rotor segment 13 is not disadvantageous.
• the curved sheet metal parts 13 ' have constant width over their circumferential length.
• the recesses 9 in the base body 6 are formed so that they have constant depth in the circumferential direction.
• the rotor segment 13 according to FIGS. 8 and 12 differs from the rotor segment according to FIGS. 7 and 11 only by the shape of the central depressions 15. It is rectangular in radial section and lies symmetrically to the transverse center plane of the rotor segment 13. As in the previous Embodiments, the recesses 15 form an axially extending groove in the rotor segment 13.
• a motor equipped with the rotor according to FIGS. 1 to 4 corresponds to a permanent magnet excited external rotor motor.
• magnet segments are located on the inside of the rotor shell 1, the described rotor segments 13, which consist of individual sheet metal parts 13 ', which consist of magnetically conductive material.
• the number of rotor segments 13 corresponds to the number of poles of the respective motor.
• the rotor segments are, except for their inner side, completely enclosed by the material of the base body 6. This material has only a low magnetic conductivity and is for example plastic or aluminum.
• the multi-pole rotating magnetic field generated by the stator 23 via a preferably positionless electronic control causes a magnetic flux through the rotor segments 13, which tends to increase the magnetic flux.
• the magnetic rotating field of the rotor is exemplified.
• the magnetic lines are shown schematically in Fig. 4 for the motor provided with the rotor.
• the stator has radially extending teeth 24, which are arranged distributed uniformly in the circumferential direction of the stator in a known manner. Each tooth 24 has an inner side 8 of the rotor shell 1 opposite end face 25 which is parallel to the inside of the 8th of the rotor shell 1 runs. From FIG.
• the magnetic lines running radially in the respective stator tooth 24 enter the rotor segments 13 at an end lying in the circumferential direction and are guided there in the circumferential direction to the other end of the rotor segment 13. From here, the magnetic lines extending over the axial height of the rotor elements 13 extend radially inwards beyond the corresponding further stator tooth 24 back to the stator. In this way, a closed magnetic circuit, which extends over the corresponding stator teeth 24 and the rotor segments 13 results.
• the shape of the rotor segments 13 allows as large a difference as possible of the reluctance in the two rotor-fixed d and q axes (FIG. 4) of the motor.
• the teeth 24 of the stator 23 are provided in a known manner with the corresponding windings. They generate when energized with a three-phase current in the air gap between the stator 23 and the rotor rotating rotating field.
• the stator teeth 24 with the energized windings each attract the nearest rotor segments 13 of the rotor and are sinusoidally less energized in a known manner when the rotor segments 13 of the rotor approaching the stator teeth 24 approaching them.
• the next phase is increasingly energized to the other stator teeth 24, which in turn attract other rotor segments 13.
• the rotor position detection ensures that the optimum phase position of the stator currents is controlled.
• the associated current profile is preferably controlled sinusoidally, so that harmonics influencing the moment are largely avoided.
• a conductor loop 26 of the described short-circuit winding extends in the axial direction of the rotor about the rotor segments 13 perpendicular to the magnetic lines.
• the motor with the rotor according to FIGS. 1 to 4 forms, as is apparent from Fig. 4, an external rotor motor with separate rotor segments 13.
• the motor is advantageously used for fans.
• fan blades are provided on the outside 7 of the rotor.
• the rotor segments 13 are connected to one another via the bottom 2.
• the rotor has the rotor segments 13 (FIG. 17) integrally formed with a bottom portion 27. From a sheet star-shaped raw bodies are punched. The arms of the green body are bent out of the plane of the green body to form the rotor segments 13. The central part of the green body forms the bottom section 27. The described punching and bending method results in the embodiment according to FIG. 17.
• the rotor segments 13 and the bottom portion 27 are embedded in the base body 6, which is made of a material having low magnetic conductivity, such as plastic or aluminum. As shown in FIG. 14, the main body 6 completely surrounds the rotor segments 13 on the outside and also covers the free ends 28 of the rotor segments 13. The bottom portion 27 is likewise completely encased by the base body 6 on the underside. The axial interspaces 29 (FIGS. 17 and 18) between adjacent rotor segments 13 are completely filled by the material of the base body 6. This results in this way a rotor with a closed shell 1, which has approximately constant thickness over its circumference.
• the rotor segments 13 are each formed the same and have approximately a rectangular shape. They are formed so curved over their height in the circumferential direction that the inner side 14 of the rotor segments in the inner side 8 of the shell 1 is located. The free edge 28 of the rotor segments 13 is chamfered at its two ends lying in the circumferential direction.
• the rotor segments 13 are connected via a narrow intermediate piece 30 with the bottom portion 27. The intermediate pieces are narrower than the rotor segments 13 and are symmetrical to them. As a result, a secure connection between the base body 6 and the rotor segments 13 is ensured.
• a short-circuit ring 31 is applied, which extends to the lower edge of the rotor segments 13 (Fig. 14).
• the short-circuit ring 31 extends over 360 °.
• a separate short-circuit part 31 is provided for each rotor segment 13.
• the rotor according to FIGS. 15 and 16 is of the same design as the rotor according to FIGS. 13 and 14.
• the magnetic flux guidance takes place in the rotor elements 13 in contrast to the embodiment according to FIGS. 1 to 4 in the axial direction.
• the magnetic flux coming from the stator initially flows radially into the corresponding rotor segment 13, in which the magnetic flux extends in the axial direction to the bottom section 27. About him the magnetic lines to the adjacent rotor segment 13 over.
• each rotor segment 13 is assigned a short-circuit ring 31 which is located in the foot region of the rotor segments, the result is shown schematically in FIGS. 17 and 18 drawn conductor loop 32 which surrounds the foot region of the rotor segments 13.
• the conductor loops 32 identify the respective short-circuit winding 31. Due to the induction current in the closed conductor loops 32 results in a flux stabilizing effect, which resulting from the magnetic excitation harmonics are significantly reduced. These harmonics lead to changing magnetic fluxes, as is the case with tooth coil windings to a greater extent.
• the respective short-circuit part 31 can be easily and securely provided on the rotor.
• the short-circuit parts 31 are made of the same material in the case where the main body 6 is made of aluminum, for example. However, if plastic is used for the main body 6, then a separate part of electrically conductive material is introduced in the foot region of the rotor segments 13 for the short-circuit part 31.
• the short-circuiting parts 31 of adjacent rotor segments 13 are spaced from each other in the circumferential direction.
• the intermediate piece 30 has the same circumferential width as the rotor segment 13.
• the circumferential short-circuit ring 31 is used, which has the same effects as the individual short-circuit parts assigned to the rotor elements 13 31.
• the rotors according to FIGS. 13 to 18 are cap-shaped as in the first embodiment and enclose the stator 23 (FIG. 4).
• the conductor loops 32 are provided at the foot end of the rotor segments 13 and surround the foot regions
• the conductor loops 26 in the rotor according to FIGS. 1 to 4 extend in height direction of the rotor segments 13 through the webs 15 ', which are provided in half the circumferential width of the rotor segments 13 in the manner described.
• the base body 6 in the rotor according to FIGS. 1 to 4 made of plastic, then the lying in the recesses 15 web 15 'made of electrically conductive material and connects at the top and bottom of the short-circuit rings in the material of the body. 6 are embedded.
• the base body 6 consists of electrically conductive material, for example aluminum, then no other material is necessary for the webs 15 'in the recesses 15 of the rotor segments 13.
• the rotors are provided for external rotor reluctance motors.
• the respective short-circuit winding 31 lies in a plane normal to the magnetic flux direction. In the rotor according to FIGS. 1 to 4, the short-circuit windings 31 lie in axial planes, while in the rotors according to FIGS. 13 to 18 they run in radial planes.
• the main body 6 which gives the rotor the necessary mechanical strength and stability, then this material also serves for the realization of the flux stabilization.
• plastic for the base 6 must also electrically conductive materials are used to achieve the short circuit.
• the rotor segments 13 and the bottom portion 27 are embedded, for example by plastic extrusion or by die-cast aluminum.
• Fig. 19 shows the magnetic flux within a reluctance internal rotor motor.
• the magnetic lines extend from the teeth of the rotor radially into the stator, within which they extend in the circumferential direction to the next tooth of the rotor, in which they re-enter radially.
• the magnetic lines run within the rotor from one tooth to the adjacent tooth.
• Fig. 20 shows the possibility to assemble the rotor segments in the manner described to a rotor assembly and to embed the rotor segments 13 in the base body 6, for example by a plastic extrusion or by an aluminum die-casting process. Subsequently, the rotor thus produced is processed by a turning operation so that the remaining between the circumferentially successive rotor segments 13 webs 34 are removed. In this way, the magnetic conductivity between the rotor segments 13 is reduced.
• the relatively thin webs 34 between the rotor segments 13 are provided to facilitate the positioning of the rotor segments 13 in the aluminum die-casting process or plastic overmolding. About the webs 34, the rotor segments 13 are aligned exactly against each other. After embedding the rotor segments 13 in the plastic or in the aluminum, the webs 34 can be easily removed by turning.
• a winding system constructed by a three-phase system is used as the tooth coil winding of the stator 23.
• a distributed winding system can also be used to generate the rotating magnetic field during operation of the motor.
• the rotor segments 13 may be made in the manner described either as complete sheet-metal shaped parts, as shown by way of example in FIG. 17, or by layered electrical sheets.
• the rotor according to FIGS. 21 to 24 is provided for an external rotor reluctance motor and similarly designed again rotor according to FIGS. 15 and 16.
• the rotor has the main body 6 (FIG. 24), which is provided on the inside with the recesses in which the rotor segments 13 lie.
• the main body 6 is produced by casting and consists in the embodiment of aluminum.
• the rotor segments 13 are arranged distributed uniformly over the circumference of the rotor and embedded in the base body 6 so that their inner sides 14 facing the rotor shaft 4 lie in the inner side 8 of the shell 1 of the main body 6.
• the rotor segments are arranged in the rotor such that their longitudinal center plane 35 (FIG. 21) extends at an acute angle ⁇ to the longitudinal center plane 36 of the rotor, viewed in side view or perpendicular to the axis of the rotor.
• the longitudinal edges 37, 38 of the rotor segments 13 extend parallel to each other and parallel to the longitudinal center plane 35. This skew of the rotor segments 13 serves to reduce the caused by the grooving of the stator torque ripple.
• the rotor segments 13 connect two return rings 39, 40 with each other, which are advantageously connected by screws 41 with the rotor segments 13.
• the return ring 40 has a larger radial width than the opposite lying return ring 39.
• the inner edge 42 of the return ring 40 is located in the inner sides 14 of the rotor elements 13 and the inner side 8 of the base body 6 containing cylindrical surface.
• the return ring 40 projects radially beyond the main body 6 and also serves as a mounting flange for attachments, such as fan wheels.
• the opposite yoke ring 39 is covered by the main body 6 at the outer edge 43.
• the return ring 39 merges into a hood-shaped cap 44, which extends curved outwards and has the sleeve-shaped projection 3 in the center. It receives one end of the rotor shaft 4, whose other end is located approximately at the level of the side facing away from the return ring 39 outside 45 of the return ring 40.
• the projection 3 is advantageously formed integrally with the cap 44.
• the cap 44 is covered by a coating 46, which is formed integrally with the base body 6 (FIG. 24). The cover 46 extends to the projection. 3
• Figs. 21 to 23 show the rotor without the base body 6 made of a material of low magnetic conductivity.
• the base body 6 in this embodiment made of plastic.
• the rotor segments 13 are, except for their inner side 14, completely surrounded by the material of the base body 6. Between the adjacent rotor segments 13 are as in the previous embodiments, the webs 12 of the base body 6, which extend over the axial height of the rotor segments 13.
• FIG. 23 schematically shows the course of the magnetic flux lines in the rotor according to FIGS. 21 to 24.
• the magnetic flux lines extend from the radially extending teeth of the stator (not shown) into the respective rotor segment 13.
• a part of the magnetic flux lines runs in the longitudinal direction of the rotor segment 13 to the return ring 39 and the other part in the longitudinal direction of the rotor segment in the direction of the conclusion ring 40.
• the flow lines run in the circumferential direction and enter the adjacent rotor segment 13.
• the flow lines extend in the longitudinal direction of the rotor segment inwards and pass over half the length of the rotor segment 13 radially into the teeth of the rotor surrounded by the stator.
• the magnetic flux lines in this case again run in the circumferential direction of the rotor and pass back to the preceding rotor segment 13.
• two circuits are formed between adjacent rotor segments, in which the flux lines in a rotor segment 13 extend to the return rings 39, 40, over which the flux lines to the adjacent rotor segment 13, in which the flow lines are opposite to each other inwardly directed.
• the flow direction between the circumferentially adjacent circuits runs opposite to each other. As shown by the flow arrows in FIG. 23, the flux lines at the right longitudinal edge in FIG. 23 of the one rotor segment 13 run clockwise within the return rings 39, 40, while the flux lines at the left longitudinal edge of this rotor segment within the return rings 39, 40 run in the counterclockwise direction extend to the adjacent rotor segment 13.
• each rotor segment 13 is associated with a total of four circuits of the magnetic flux lines, wherein within each rotor segment 13 the magnetic flux lines extend from the return rings 39, 40 over approximately half the axial length of the rotor segments 13.
• the magnetic flux coming from the stator is divided into the two axial components in the manner described.
• the dividing line runs in the circumferential direction of the rotor in the middle of the rotor segments 13.
• the rotor segments 13 of the rotor according to FIGS. 21 to 24 can also consist of layered lamellae, as has been described by way of example with reference to FIGS. 5 to 8.
• the embodiment shown in FIGS. 21 to 24 with axial rotor flux guidance represents a mechanically favorable form of the rotor structure for a synchronous reluctance motor both as an external and as an internal rotor motor.
• the magnetic inference takes place in each case via the attachment parts 39; 40, 44, which improve the mechanical structure of the rotor.
• the described principle of action is also applicable in the same way in an internal rotor synchronous reluctance motor.
• the return ring 39 instead of the return ring 40 as shown in FIG. 24, the return ring 39 is provided with the dome-shaped cap 44, which is curved in the opposite direction to the opposite cap 44 and has the sleeve-shaped projection 3 on the inside. It is also advantageously formed integrally with the cap 44. On the inside, the cap 44 is also covered by the coating 46, which is formed integrally with the base body.
• the rotor segments 13 are exposed on the outside.
• the rotor shaft 4 is fixed at its one end in the right in Fig. 25 projection 3 and protrudes through the opposite projection 3 on the cap 44 also.
• the rotor is surrounded by the stator shown only schematically, indicated by dash-dotted lines.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Synchronous Machinery (AREA)
• Manufacture Of Motors, Generators (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2014
  • 2014-04-25 DE DE102014006288.0A patent/DE102014006288A1/de not_active Withdrawn
  • 2014-04-29 US US14/787,373 patent/US20160141923A1/en not_active Abandoned
  • 2014-04-29 CN CN201480035573.6A patent/CN105594108A/zh active Pending
  • 2014-04-29 EP EP14727371.8A patent/EP2992589A2/de not_active Withdrawn
  • 2014-04-29 JP JP2016510963A patent/JP2016520278A/ja active Pending
  • 2014-04-29 RU RU2015151054A patent/RU2015151054A/ru not_active Application Discontinuation
  • 2014-04-29 WO PCT/EP2014/001141 patent/WO2014177270A2/de active Application Filing
  • 2014-04-29 BR BR112015027185A patent/BR112015027185A2/pt not_active IP Right Cessation

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