Electromagnetic excitation system, electromagnetic brake, and method for manufacturing the electromagnetic excitation system

Abstract

The present invention provides a well-improved electromagnetic excitation system for electromagnetic brakes or clutches, and a method for manufacturing such a system. [Solution] An electromagnetic excitation system 1 for an electromagnetic brake 2 or clutch comprises an electromagnet 10 and a permanent magnet 40, wherein the electromagnet is a pot-shaped and ring-shaped housing 20 about a longitudinal axis L, and includes an excitation coil, the housing having an inner ring portion 22, an outer ring portion 24, and a bottom portion 26, and the excitation coil is inserted into the housing between the inner ring portion and the outer ring portion, with the free end of the outer ring portion forming a magnetic pole 15, and the permanent magnet is positioned on a flange 50 on the side opposite to the excitation coil, the flange is positioned on the side opposite to the bottom portion of the excitation coil, and protrudes from the inner ring portion toward the outer ring portion, forming an air gap 60 between the flange and the outer ring portion.

Description

Technical Field

[0001] The present invention relates to an electromagnetic excitation system having the features of claim 1, an electromagnetic brake or clutch having the features of claim 9, and a method for manufacturing an electromagnetic brake having the features of claim 11.

Background Art

[0002] Electromechanical brakes or clutches are known from the prior art in various configurations. In the prior art, electromechanical brakes in this technical field are used, for example, as permanent magnet brakes or spring brakes, and include an electromagnetic excitation system having an electromagnet, which can cooperate with an anchor plate to operate the tribological system of the brake or clutch or to bring about frictional contact.

[0003] Typically, the electromagnet includes a pot-shaped and ring-shaped housing, which can be arranged around a longitudinal axis and a shaft, for example, the shaft of a servomotor. The housing has an inner ring portion and an outer ring portion, and an excitation coil is inserted into the housing between the inner ring portion and the outer ring portion. The free ends of the inner ring portion and the outer ring portion form the magnetic poles of the electromagnet and also the friction surfaces, whereby the electromechanical general-purpose brake or clutch is also called a pole friction brake or clutch.

[0004] In the prior art, permanent magnets are also used as restoring means. In the non-energized state of the electromagnet, for example, the brake is actuated by a permanent magnet to achieve an emergency stop, for example, during a power failure. Further prior art includes (Patent Document 1), (Patent Document 2), and (Patent Document 3).

[0005] Although such electromagnetic brakes or clutches have already proven their performance in the past, known electromagnetic brakes or clutches have a relatively long structural length and are complicated to manufacture.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] U.S. Patent Application Publication No. 2023 / 296140 [Patent Document 2] German Utility Model No. 202004001042 Specification [Patent Document 3] German Patent Application Publication No. 19946084 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, the object of the present invention is to propose a well-improved electromagnetic excitation system for electromagnetic brakes or clutches, an improved electromagnetic brake or clutch, and a method for manufacturing a well-improved electromagnetic excitation system that overcomes the drawbacks known from the prior art. [Means for solving the problem]

[0008] These problems are solved by a method for manufacturing an electromagnetic excitation system having the features of claim 1, an electromagnetic brake or clutch having the features of claim 9, and an electromagnetic brake having the features of claim 11.

[0009] Further developments of the present invention are described in the dependent claims. An electromagnetic excitation system for an electromagnetic brake or clutch having the features of claim 1 according to the present invention comprises an electromagnet and a permanent magnet.

[0010] The electromagnet includes a pot-shaped and ring-shaped housing arranged around a longitudinal axis, and an excitation coil. The pot-shaped and ring-shaped housing comprises an inner ring portion, an outer ring portion, and a bottom portion connecting the inner and outer ring portions.

[0011] Furthermore, an excitation coil is inserted into the housing between the inner and outer ring sections, and the free end of the outer ring section forms a magnetic pole. Furthermore, the permanent magnet is intended to be positioned on the flange on the side opposite to the excitation coil. Additionally, the flange can be positioned on the side opposite to the bottom of the excitation coil and may protrude from the inner ring portion toward the outer ring portion, forming an air gap between the flange and the outer ring portion.

[0012] The present invention is based on the idea of ​​proposing an electromagnetic excitation system having a particularly compact structure. Unlike, for example, International Publication No. 2006 / 087017, the permanent magnet is not formed in a sleeve shape and has radial magnetization around the longitudinal axis, but rather is in a disk or disk ring shape and is preferably magnetized in the axial direction.

[0013] When the electromagnet is de-energized, the magnetic field lines within the flange split into a main flux and a secondary flux passing through the air gap within the magnetic circuit that passes through the housing around the excitation coil. In the outer ring, the main and secondary fluxes merge and flow back to the permanent magnet.

[0014] When an electromagnet is energized, the magnetic field of the excitation coil shifts, changes direction, or cancels out the magnetic fields of permanent magnets within the region of the magnetic poles and anchor plate. For example, when an electromagnetic excitation system is used in a brake, energizing the electromagnet can release the brake. That is, the brake opens, and for example, the motor shaft can rotate again.

[0015] Furthermore, it has been demonstrated that it is advantageous for the air gap to act as a magnetoresistance and as a secondary air gap within the magnetic circuit of a permanent magnet. In particular, the air gap acts as a magnetoresistance and as a secondary air gap within the magnetic circuit of a permanent magnet when the electromagnet is not energized.

[0016] In an advanced form of the present invention, the permanent magnet and / or the free end of the inner ring portion are intended to be recessed into the housing relative to the free end of the outer ring portion or the magnetic pole in the longitudinal axis direction. In other words, the distance between the permanent magnet and the excitation coil, and / or the distance between the free end of the inner ring portion and the excitation coil is smaller than the distance between the magnetic pole and the excitation coil. The above distances are measured along the longitudinal axis or parallel to the longitudinal axis. Therefore, in the closed state of the brake, the anchor plate is in contact only with the magnetic pole or the free end of the outer ring portion. For this reason, the magnetic pole can also be called a unipolar pole.

[0017] Furthermore, it has been demonstrated that it is advantageous for the flange to be inserted into the housing. Preferably, the flange is press-fitted into the housing and connected to the inner ring portion by a press connection, thereby keeping the magnetic resistance between the housing and the flange low. Moreover, such a connection can be achieved with high cost-effectiveness, especially without any further fastening means. Furthermore, by inserting the flange into the housing, the excitation coil is positioned within the housing in a way that prevents it from falling out and protects it from external influences.

[0018] Alternatively, the flange may be secured to the housing by adhesive, clamping, welding, or soldering, or by further fastening means such as screws or rivets. The flange may also be secured or positioned to the housing by knurled connections.

[0019] Furthermore, it has been demonstrated that permanent magnets made of hard ferrite, samarium-cobalt, neodymium-iron-boron, resin-bonded hard ferrite, or resin-bonded neodymium-iron-boron are advantageous. Such magnets are sufficiently powerful and have demonstrated performance in many applications.

[0020] According to a development form of the present invention, the permanent magnet is adhered, sprayed, or sintered to the flange. In particular, when the permanent magnet is sprayed or sintered, it is advantageous because no additional fixing means is required. For example, resin-bonded permanent magnets have been proven to be advantageous because they can be easily applied to the flange by spraying and do not require additional fixing means.

[0021] Furthermore, it has been proven advantageous that the housing is formed in a single piece including an inner ring portion, an outer ring portion, and a bottom. The housing preferably consists of a soft magnetic material that can be easily magnetized. Furthermore, it has been proven advantageous that the flange is also manufactured from a soft magnetic material that can be easily magnetized.

[0022] In a development form of the present invention, it is contemplated that the excitation coil includes a coil carrier and a coil winding. The coil winding is preferably wound around the coil carrier, and the coil carrier preferably includes an electrically insulating material, such as plastic, or is manufactured from an electrically insulating material.

[0023] Furthermore, it has been proven advantageous that the coil carrier includes at least one strain region, and the strain region generates a frictional engagement between the excitation coil and the housing by being strained when the excitation coil is inserted into the housing.

[0024] The at least one strain region can include at least one raised portion or one or more protrusions. The at least one strain region can particularly include a portion formed in a waveform (preferably having a raised portion protruding on the side opposite to the coil winding), and when the excitation coil is inserted into the housing, the raised portion is pushed in, causing strain of the coil carrier, thereby generating a frictional engagement between the excitation coil and the housing.

[0025] A further aspect of the present invention relates to an electromagnetic brake or clutch comprising the electromagnetic excitation system described above, wherein an anchor plate is provided which cooperates with an electromagnet and a permanent magnet, and the anchor plate is slidable in the longitudinal axial direction.

[0026] This electromagnetic brake or clutch allows for a particularly compact structure. Unlike, for example, International Publication No. 2006 / 087017, the permanent magnet is not formed in a sleeve shape and has radial magnetization around the longitudinal axis, but rather in a disc shape, positioned on the opposite side of the excitation coil, and magnetized in the axial direction.

[0027] When the electromagnet is de-energized, the magnetic field lines within the flange split into a primary flux and a secondary flux passing through the air gap within the magnetic circuit that passes through the housing around the excitation coil. At the outer ring, the primary and secondary fluxes merge and flow together through the magnetic poles into the anchor plate, returning to the permanent magnet. The magnetoresistance attracts the anchor plate to the magnetic poles, thereby closing the electromagnetic brake.

[0028] When the electromagnet is energized, a direct current is supplied to the excitation coil, shifting the magnetic field of the excitation coil and changing the direction of the magnetic field of the permanent magnets within the region of the magnetic poles and anchor plate. Therefore, the brake can be released. That is, the brake opens, and for example, the motor shaft can rotate again.

[0029] A further aspect of the present invention is a method for manufacturing an electromagnetic excitation system for an electromagnetic brake or clutch, more particularly comprising an electromagnet and a permanent magnet, - A step of providing a pot-shaped and ring-shaped housing having a longitudinal axis, an inner ring portion, an outer ring portion, and a bottom portion connecting the inner ring portion and the outer ring portion, - The step of providing an excitation coil, - The step of inserting an excitation coil into the housing between the inner ring portion and the outer ring portion to form an electromagnet, - The steps of providing a flange and a disc-shaped permanent magnet positioned on the end face of the flange, - The step of positioning the flange in the housing such that the permanent magnet is located on the side opposite to the excitation coil, and the flange protrudes from the inner ring portion toward the outer ring portion, forming an air gap between the flange and the outer ring portion. Regarding methods including

[0030] A method for manufacturing an electromagnetic excitation system, particularly an electromagnetic excitation system for an electromagnetic brake, is characterized by enabling the easy and cost-effective manufacture of an excitation system for a particularly compact electromagnetic brake. In particular, this method eliminates the need for further fixing means, and all components can be connected to each other in a frictional engagement manner, preferably in a single work step.

[0031] In an advanced form of the method according to the present invention, permanent magnets are intended to be bonded, sintered, or sprayed onto the end face of a flange in order to provide a flange. For example, multiple permanent magnets can be bonded to the end face, or resin-bonded magnets can be sprayed onto the end face in a thin layer, preferably, the magnetization is carried out axially, i.e., along the longitudinal axis.

[0032] The permanent magnet is preferably disk-shaped, and more preferably has a thickness in the longitudinal axis that is less than the thickness of the flange. Preferably, according to one development, the permanent magnet is magnetized only after being placed on the end face of the flange.

[0033] In an advanced form of the present invention, the flange is intended to be connected to the housing. For example, the flange can be fixed to the housing by adhesive, clamping, welding, or soldering, or by further fastening means such as screws or rivets.

[0034] In particular, it is preferable that the flange is inserted into the housing. During flange insertion, the flange is positioned in the housing between the inner and outer ring portions, forming an air gap. Here, the flange with the permanent magnet is inserted into the housing until the permanent magnet and / or the free end of the inner ring portion are recessed relative to the magnetic pole in the longitudinal axis direction. In other words, the distance between the permanent magnet and the excitation coil, and / or the distance between the free end of the inner ring portion and the excitation coil, is smaller than the distance between the magnetic pole and the excitation coil.

[0035] For example, when an electromagnetic excitation system is used to form a brake or clutch that includes an anchor plate cooperating with an electromagnet and a permanent magnet, the anchor plate, in the closed state of the brake or clutch, contacts only the magnetic poles, i.e., the free ends of the outer ring portion of the housing, and not the permanent magnet.

[0036] Preferably, the flange is press-fitted into the housing, and more preferably, a press-fit connection is established between the flange and the housing, particularly the inner ring portion, thereby ensuring that the flange is particularly securely positioned in the housing.

[0037] In an advanced form of the present invention, it is intended that the excitation coil is connected to the housing in a frictional engagement manner when the excitation coil is inserted. For example, the inner ring portion, the outer ring portion, and / or the excitation coil may have an appropriate surface structure, such as a rib structure, which allows the excitation coil to be positioned in a frictional engagement manner within the housing.

[0038] Furthermore, it has been demonstrated that it is advantageous for the excitation coil to include a coil carrier and a coil winding. The coil carrier is preferably manufactured from an electrically insulating material such as plastic, and the coil winding is placed on or wound around the coil carrier. Furthermore, it is preferable that the coil carrier has at least one strain region, which is strained such that when the excitation coil is inserted into the housing, the excitation coil is positioned within the housing in a frictionally engaged manner.

[0039] At least one strain region may include, for example, at least one ridge or projection protruding on the side opposite to the coil winding, and when the excitation coil is inserted into the housing, at least one ridge or projection is strained or pressed in, causing strain on the coil carrier, thereby creating frictional engagement between the excitation coil and the housing.

[0040] Furthermore, it is advantageous if frictional engagement between the excitation coil and the housing is established when the flange is inserted, more preferably when it is press-fitted. For example, the excitation coil can initially be loosely inserted into the housing. Frictional engagement between the excitation coil and the housing occurs when the flange is press-fitted, which is achieved by the flange pressing the excitation coil against its bottom, causing strain in the excitation coil or at least one strain region within the housing, and thereby positioning the excitation coil within the housing in a frictional engagement manner.

[0041] The following describes exemplary embodiments in detail with reference to the attached drawings. [Brief explanation of the drawing]

[0042] [Figure 1] This is a cross-sectional view of a disengaged electromagnetic brake equipped with an excitation system and an anchor. [Figure 2a] Figure 1 shows the electromagnetic excitation system of an electromagnetic brake. [Figure 2b] Figure 2a is a detailed diagram of the electromagnetic excitation system. [Figure 3] Figure 1 is a schematic detail diagram of the magnetic flux inside the released electromagnetic brake. [Figure 4] This is a schematic detail diagram of the magnetic flux inside a deactivated electromagnetic brake. [Figure 5] Figures 1-4 show detailed diagrams of the excitation coils of the excitation system before insertion into the housing. [Modes for carrying out the invention]

[0043] In the detailed descriptions of the following drawings, identical or functionally identical parts or features are identified by the same reference numeral. However, not all identical or functionally identical parts or features in the drawings are assigned a reference numeral.

[0044] Figure 1 shows an exemplary embodiment of an electromagnetic brake 2 equipped with an electromagnetic excitation system 1. The electromagnetic excitation system 1 of the electromagnetic brake 2 shown in Figure 1 is shown in detail in Figure 2a and comprises an electromagnet 10 and a permanent magnet 40.

[0045] The electromagnet 10 includes a housing 20 that is formed in a pot shape and a ring shape around a longitudinal axis L. Preferably, the housing 20 is configured substantially rotationally symmetric, with the longitudinal axis L being the axis of symmetry.

[0046] The pot-shaped and ring-shaped housing 20 can be manufactured from a soft magnetic material and comprises an inner ring portion 22, an outer ring portion 24, and a bottom portion 26 connecting the inner ring portion 22 and the outer ring portion 24.

[0047] The inner ring portion 22 and the outer ring portion 24 are connected to the bottom portion 26 at one end and protrude from the bottom portion 26, each having a free end at the other end. In other words, the housing 20 is provided with an axial annular groove for housing the excitation coil 30.

[0048] The free end of the outer ring portion 24 forms a magnetic pole 15. The excitation coil 30 is inserted into the housing 20, and the excitation coil 30 is inserted into the housing 20 between the inner ring portion 22 and the outer ring portion 24, that is, within the axial annular groove.

[0049] The excitation coil 30 includes a coil carrier 32 and a coil winding 34. The coil winding 34 is preferably wound around the coil carrier 32, which is preferably made of or manufactured from an electrical insulating material, such as plastic.

[0050] The coil carrier 32 may have at least one strain region 36 (see Figure 5), which strains when the excitation coil 30 is inserted into the housing 20, creating frictional engagement between the excitation coil 30 and the housing 20, particularly between the inner ring portion 22 and / or the outer ring portion 24.

[0051] At least one strain region 36 includes a portion whose cross-section is formed in a corrugated shape and has at least one protruding ridge 38, or one or more projections. The ridge 38 is pressed into the housing 20 when the excitation coil 30 is inserted, causing strain in the coil carrier 32, which results in frictional engagement between the excitation coil 30 and the housing 20.

[0052] Furthermore, the electromagnetic excitation system 1 includes a flange 50, which is preferably made from a soft magnetic material. A permanent magnet 40 is preferably fixedly positioned on one end face of the flange 50. This allows the flange 50 and the permanent magnet 40 to be firmly connected to each other and form a unit.

[0053] The permanent magnet 40 is preferably disk-shaped, more precisely an annular disk, and preferably the thickness D1 of the permanent magnet 40 is less than the thickness D2 of the flange 50, and even more preferably a fraction of the thickness D2 of the flange 50.

[0054] The permanent magnet 40 is magnetized in the axial direction, which means that the annular disk-shaped permanent magnet 40 is magnetized through its thickness and that its poles lie on a flat circular surface. The permanent magnet 40 may be hard ferrite, samarium cobalt magnet, neodymium iron boron magnet, resin-bonded hard ferrite, or resin-bonded neodymium iron boron magnet, and can be bonded, sprayed, or sintered to the flange 50.

[0055] The flange 50 is inserted into the housing 20, and the permanent magnet 40 is located on the side opposite to the excitation coil 30. As can be seen in particular from the attached drawing, the flange 50 is positioned on the side of the excitation coil 30 opposite to the bottom portion 26, protruding from the inner ring portion 22 toward the outer ring portion 24, and forming an air gap 60 between the flange 50 and the outer ring portion 24.

[0056] In the simplest case, the flange 50 can be press-fitted into the housing 20 or into the inner ring portion 22, thereby securely connecting the flange 50 to the inner ring portion 22. Furthermore, this connection does not have significant magnetic resistance.

[0057] Alternatively, the flange 50 may be fixed to the housing 20 by adhesive, clamping, welding, or soldering, or by further fastening means such as screws or rivets. The flange 50 may also be fixed or positioned to the housing 20 by knurled connections.

[0058] The air gap 60 has higher magnetoresistance and can function as a magnetoresistance and secondary air gap in the magnetic system described later. The permanent magnet 40 and flange 50 are preferably arranged recessed into the housing 20 in the longitudinal axis L direction relative to the free end of the outer ring portion 24 or the magnetic pole 15.

[0059] The free end of the inner ring portion 22 can also be positioned recessed relative to the free end of the outer ring portion 24 or the magnetic pole 15 in the longitudinal axis L direction. In other words, as shown in Figure 2b, the first distance A1 measured between the permanent magnet 40 and the excitation coil 30, and / or the second distance A2 (not shown) between the free end of the inner ring portion 22 and the excitation coil 30 can be smaller than the third distance A3 between the magnetic pole 15 and the excitation coil 30.

[0060] Furthermore, the electromagnetic brake 2 shown in Figure 1 includes an anchor plate 70 that cooperates with the electromagnet 10 and the permanent magnet 40 in a known manner. The anchor plate 70 is slidable along the longitudinal axis L.

[0061] The anchor plate 70 is further positioned on the flange hub 80, where the anchor plate 70 is connected to the flange hub 80, for example, via a spring mechanism 75, and is slidable in the longitudinal axis L direction by the spring mechanism 75.

[0062] The flange hub 80 comprises a hub portion 82 and a flange portion 84, and can be connected to, for example, the motor shaft of a synchronous machine in a known manner. Figures 3 and 4 schematically show the magnetic system of a permanent magnet brake equipped with an electromagnetic excitation system 1.

[0063] Under the influence of the permanent magnetic field of the permanent magnet 40, the anchor plate 70 is pressed against the magnetic pole 15 in a frictional engagement manner. The resulting frictional force generates braking torque. In this state, the electromagnet 10 of the excitation system 1 is unenergized, and the magnetic flux of the permanent magnet 40 is divided at the flange into a main magnetic flux H and a secondary magnetic flux N.

[0064] The main magnetic flux H flows from the flange 50 through the housing 20 and around the excitation coil 30, that is, from the inner ring portion 22 through the bottom portion 26 to the outer ring portion 24. The secondary magnetic flux N flows through the flange 50 and into the outer ring portion 24 via the air gap 60.

[0065] In the outer ring portion 24, the main magnetic flux H and the secondary magnetic flux N merge and both flow through the magnetic poles 15, the anchor plate 70, and the permanent magnet 40. The magnetic resistance attracts the anchor plate 70 to the magnetic pole 15, thereby closing the electromagnetic brake 2.

[0066] To counteract the braking effect, i.e., to release the electromagnetic brake 2, as shown in Figure 4, a DC voltage is applied to the excitation coil 30 by a reverse electromagnetic field, causing the permanent magnetic field acting on the anchor plate 70 to shift, change direction, and cancel each other out, thereby opening the electromagnetic brake 2. This is done by the spring mechanism 75 moving the anchor plate 70 away from the excitation system 1 along the longitudinal axis L and pulling it toward the flange portion 84 of the flange hub 80. The magnetic flux F flows through the housing 20, the flange 50, and the air gap 60.

[0067] The electromagnetic excitation system 1 for the electromagnetic brake 2 or clutch can be manufactured particularly easily and cost-effectively. First, a pot-shaped and ring-shaped housing 20, an excitation coil 30, a flange 50, and an annular disc-shaped permanent magnet 40 positioned on the end face of the flange 50 are provided. Next, the excitation coil 30 is inserted into the housing 20 between the inner ring portion 22 and the outer ring portion 24 to form an electromagnet.

[0068] Finally, the permanent magnet 40 is positioned on the side opposite to the excitation coil 30, and the flange 50 is positioned on the housing 20 such that the flange 50 protrudes from the inner ring portion 22 toward the outer ring portion 24, forming an air gap 60 between the flange 50 and the outer ring portion 24.

[0069] Preferably, permanent magnets 40 can be bonded, sintered, or sprayed onto the end face of the flange 50 before the flange 50 is placed on the housing 20. For this purpose, for example, a number of permanent magnets can be bonded to the end face, or sprayed onto the end face as a thin layer with resin bonding, and the magnetization is carried out axially, i.e., along the longitudinal axis L.

[0070] The flange 50 can be positioned onto the housing 20 by press-fitting it into the housing 20, and the flange 50 is preferably pressed against the inner ring portion 22.

[0071] Here, the flange 50 having the permanent magnet 40 is slid within the housing 20 until the permanent magnet 40 and the flange 50 are recessed in the longitudinal axis L direction relative to the magnetic pole 15.

[0072] When the excitation coil 30 is inserted, it can be connected to the housing 20 in a frictional engagement manner. For this reason, for example, when the excitation coil 30 is inserted into the housing 20, a strain region 36 can be strained, and this strain may occur when the flange 50 is press-fitted or inserted. [Explanation of symbols]

[0073] 1. Excitation System 2. Brake 10 Electromagnets 15 magnetic poles 20 Housing 22 Inner ring section 24 Outer ring section 26 Bottom 30 Excitation coil 32 Coil Carrier 34 Coil winding 36. Strain Region 38 Ridge 40 permanent magnets 50 flange 60 Air Gap 70 Anchor Plate 75 Spring mechanism 80 Flange Hub 82 Hub section 84 Flange section A1 First interval A2 Second interval A3 Third interval F magnetic flux H Main magnetic flux L Longitudinal axis N secondary magnetic flux

Claims

1. An electromagnetic excitation system (1) for an electromagnetic brake (2) or clutch, comprising an electromagnet (10) and a permanent magnet (40), The electromagnet (10) includes a housing (20) which is pot-shaped and ring-shaped around a longitudinal axis (L), and which has an inner ring portion (22), an outer ring portion (24), and a bottom portion (26) connecting the inner ring portion (22) and the outer ring portion (24), and an excitation coil (30), The excitation coil (30) is inserted into the housing (20) between the inner ring portion (22) and the outer ring portion (24), and the free end of the outer ring portion (24) forms a magnetic pole (15). The permanent magnet (40) is positioned on the flange (50) on the side opposite to the excitation coil (30), The electromagnetic excitation system (1) is characterized in that the flange (50) is positioned on the side of the excitation coil (30) opposite to the bottom portion (26), protruding from the inner ring portion (22) toward the outer ring portion (24), and forming an air gap (60) between the flange (50) and the outer ring portion (24).

2. The permanent magnet (40) and / or the free end of the inner ring portion (22) are positioned recessed relative to the magnetic pole (15) in the longitudinal axis (L) direction. The electromagnetic excitation system (1) according to feature 1.

3. The electromagnetic excitation system (1) according to claim 1 or 2, characterized in that the flange (50) is press-fitted into the housing (20).

4. The permanent magnet (40) is hard ferrite, samarium cobalt magnet, neodymium iron boron magnet, resin-bonded hard ferrite, or resin-bonded neodymium iron boron magnet. The electromagnetic excitation system (1) according to any one of claims 1 to 3.

5. The electromagnetic excitation system (1) according to any one of claims 1 to 4, characterized in that the permanent magnet (40) is bonded to, sprayed, or sintered to the flange.

6. The electromagnetic excitation system (1) according to any one of claims 1 to 5, characterized in that the air gap (60) acts as a magnetoresistance and as a secondary air gap in the magnetic circuit of the permanent magnet (40).

7. The electromagnetic excitation system (1) according to any one of claims 1 to 6, characterized in that the housing (20) is formed from a single piece and comprises the inner ring portion (22), the outer ring portion (24), and the bottom portion (26).

8. The electromagnetic excitation system (1) according to any one of claims 1 to 7, wherein the excitation coil (30) includes a coil carrier (32) and a coil winding (34), the coil carrier (32) having at least one strain region (36), the strain region (36) strains when the excitation coil (30) is inserted into the housing (20), and generates frictional engagement between the excitation coil (30) and the housing (20).

9. An electromagnetic brake (2) comprising an electromagnetic excitation system (1) according to any one of claims 1 to 8, An electromagnetic brake (2) is provided, characterized in that an anchor plate (70) is provided that cooperates with the electromagnet (10) and the permanent magnet (40) and is slidable along the longitudinal axis (L).

10. The electromagnetic brake (2) according to claim 9, characterized in that the anchor plate (70) is slidably arranged on the flange hub (80) in the longitudinal axis (L) direction.

11. A method for manufacturing an electromagnetic excitation system (1) for an electromagnetic brake (2), particularly the electromagnetic excitation system (1) according to any one of claims 1 to 8 and / or the electromagnetic excitation system (1) for an electromagnetic brake (2) according to claim 9 or 10, The step of providing an electromagnet (10) comprising a pot-shaped and ring-shaped housing (20) having an inner ring portion (22) and an outer ring portion (24), and an excitation coil (30), The steps include providing an excitation coil (30), The steps include inserting the excitation coil (30) into the housing (20) between the inner ring portion (22) and the outer ring portion (24), The steps include providing a flange (50) and a permanent magnet (40) positioned on the flange (50), The steps include positioning the flange (50) in the housing (20) such that the permanent magnet (40) is positioned on the side opposite to the excitation coil, and the flange (50) protrudes from the inner ring portion (22) toward the outer ring portion (24), forming an air gap (60) between the flange (50) and the outer ring portion (24); A method that includes this.

12. The method according to 11, characterized in that the permanent magnet (40) is bonded to, sprayed, or sintered to the flange (50).

13. The method according to 11 or 12, characterized in that the flange (50) is inserted into the housing (20), and in particular is pressed.

14. The excitation coil (30) is positioned within the housing (20) in a friction-engagement manner when inserted into the housing (20). The method according to any one of claims 11 to 13, characterized by...

15. The method according to any one of claims 11 to 14, wherein the excitation coil (30) includes a coil carrier (32) and a coil winding (34), the coil carrier (32) has at least one strain region (36), the strain region (36) is strained when the excitation coil (30) is inserted into the housing (20), and the excitation coil (30) is arranged in the housing (20) in a frictional engagement manner.

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