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EP-4741677-A1 - ELECTROMAGNETIC EXCITATION SYSTEM, ELECTROMAGNETIC BRAKE OR CLUTCH, AND METHOD FOR PRODUCING AN ELECTROMAGNETIC EXCITATION SYSTEM

EP4741677A1EP 4741677 A1EP4741677 A1EP 4741677A1EP-4741677-A1

Abstract

The present invention relates to an electromagnetic excitation system (1) for an electromagnetic brake (2) or clutch, comprising an electromagnet (10) and a permanent magnet (40), wherein the electromagnet (10) comprises a cup-shaped and annular housing (20) about a longitudinal axis (L) with an inner ring section (22), an outer ring section (24), a base section (26) connecting the inner ring section (22) and the outer ring section (24), and an excitation coil (30), wherein the excitation coil (30) is inserted into the housing (20) between the inner ring section (22) and the outer ring section (24), and wherein a free end of the outer ring section (24) forms a magnetic pole (15), wherein the permanent magnet (40) is arranged on a flange (50) on the side facing away from the excitation coil (30), and wherein the flange (50) is located on the side facing away from the base section (26). the excitation coil (30) is arranged and extends from the inner ring section (22) to the outer ring section (24) forming an air gap (60) between the flange (50) and the outer ring section (24).

Inventors

  • HUBRICH, JOACHIM
  • Quartarone, Salvatore

Assignees

  • Kendrion (Villingen) GmbH

Dates

Publication Date
20260513
Application Date
20250822

Claims (15)

  1. Electromagnetic excitation system (1) for an electromagnetic brake (2) or clutch, comprising an electromagnet (10) and a permanent magnet (40), - wherein the electromagnet (10) comprises a pot-shaped and ring-shaped housing (20) about a longitudinal axis (L) with an inner ring section (22), an outer ring section (24), a base section (26) connecting the inner ring section (22) and the outer ring section (24) and an excitation coil (30), - wherein the excitation coil (30) is inserted into the housing (20) between the inner ring section (22) and the outer ring section (24), and wherein a free end of the outer ring section (24) forms a magnetic pole (15), - wherein the permanent magnet (40) is arranged on a flange (50) on the side facing away from the excitation coil (30), and - wherein the flange (50) is arranged on the side of the excitation coil (30) facing away from the bottom section (26) and extends from the inner ring section (22) to the outer ring section (24) forming an air gap (60) between the flange (50) and the outer ring section (24).
  2. Electromagnetic excitation system (1) according to claim 1, characterized in that the permanent magnet (40) and/or a free end of the inner ring section (22) is opposite the magnetic pole (15) is arranged offset in the longitudinal axis (L).
  3. Electromagnetic excitation system (1) according to claim 1 or 2, characterized in that the flange (50) is pressed into the housing (20).
  4. Electromagnetic excitation system (1) according to one of the preceding claims, characterized in that the permanent magnet (40) is a hard ferrite, a samarium cobalt magnet, a neodymium iron boron magnet, a polymer-bonded hard ferrite or a polymer-bonded neodymium iron boron magnet.
  5. Electromagnetic excitation system (1) according to one of the preceding claims, characterized in that the permanent magnet (40) is glued, injection-molded or sintered onto the flange.
  6. Electromagnetic excitation system (1) according to one of the preceding claims, characterized in that the air gap (60) acts as a magnetic resistance and as a secondary air gap in a magnetic circuit of the permanent magnet (40).
  7. Electromagnetic excitation system (1) according to one of the preceding claims, characterized in that the housing (20) is connected to the inner ring section (22), the outer ring section (24) and the bottom section (26) is formed in one piece.
  8. Electromagnetic excitation system (1) according to one of the preceding claims, characterized in that the excitation coil (30) comprises a coil carrier (32) and coil windings (34), and that the coil carrier (32) has at least one deformation area (36) which is deformed when the excitation coil (30) is inserted into the housing (20) in order to create a force-fit connection between the excitation coil (30) and the housing (20).
  9. Electromagnetic brake (2) with an electromagnetic excitation system (1) according to one of the preceding claims characterized in that an armature plate (70) is provided which interacts with the electromagnet (10) and the permanent magnet (40) and is displaceable along the longitudinal axis (L).
  10. Electromagnetic brake (2) according to claim 9, characterized in that the anchor plate (70) is arranged so as to be displaceable in the longitudinal axis (L) on a flange hub (80).
  11. Method for manufacturing an electromagnetic excitation system (1) for an electromagnetic brake (2), in particular an electromagnetic excitation system (1) according to one of claims 1 to 8 and/or for an electromagnetic brake (2) according to one of claims 9 to 10, comprising the following method steps: - Providing an electromagnet (10) with a pot- and ring-shaped housing (20) with an inner ring section (22) and an outer ring section (24) and with an excitation coil (30); - Provide an excitation coil (30); - Inserting the excitation coil (30) into the housing (20) between the inner ring section (22) and the outer ring section (24); - Providing a flange (50) with a permanent magnet (40) arranged on the flange (50); and - Arrange the flange (50) on the housing (20) such that the permanent magnet (40) is arranged on the side facing away from the excitation coil and that the flange (50) extends from the inner ring section (22) to the outer ring section (24) forming an air gap (60) between the flange (50) and the outer ring section (24).
  12. Method according to claim 11, characterized in that the permanent magnet (40) is glued, sprayed or sintered onto the flange (50).
  13. Method according to claim 11 or 12, characterized in that the flange (50) is inserted into the housing (20), in particular pressed in.
  14. Method according to any one of claims 11 to 13, characterized by the fact that The excitation coil (30) is arranged in the housing (20) in a force-fit manner when inserted into the housing (20).
  15. Method according to any one of claims 11 to 14, characterized in that the excitation coil (30) comprises a coil carrier (32) and coil windings (34), and that the coil carrier (32) has at least one deformation area (36) which is deformed when the excitation coil (30) is inserted into the housing (20) in order to arrange the excitation coil (30) in the housing (20) in a force-fit manner.

Description

The present invention relates to an electromagnetic excitation system with the features of claim 1, an electromagnetic brake or clutch with the features of claim 9, and a method for manufacturing an electromagnetic brake with the features of claim 11. Electromechanical brakes or clutches are known in various designs from the prior art. In the prior art, electromechanical brakes of this type are used, for example, as permanent magnet brakes or spring-applied brakes and comprise an electromagnetic excitation system with an electromagnet that can interact with an armature plate to actuate or bring into frictional contact a tribological system of the brake or clutch. Typically, an electromagnet comprises a pot- and ring-shaped housing that can be arranged around a longitudinal axis and a shaft, such as the shaft of a servo motor. The housing has an inner ring section and an outer ring section, and an excitation coil is inserted between these two sections. The free ends of the inner and outer ring sections form the magnetic poles of the electromagnet and also the friction surfaces, which is why electromechanical brakes or clutches are also referred to as pole friction brakes or clutches. In the prior art, permanent magnets are also used as restoring devices. For example, when the electromagnet is de-energized, the brake is actuated by the permanent magnets to achieve an emergency stop in the event of a power failure. Printed materials represent the further state of the art. US 2023 296 140 A1 , DE 20 2004 001 042 U1 and DE 199 46 084 A1 . Such electromagnetic brakes or clutches have proven their worth in the past; however, the known electromagnetic brakes or clutches are relatively long in length and complex to manufacture. The present invention is therefore based on the objective of proposing a suitably improved electromagnetic excitation system for an electromagnetic brake or clutch, an improved electromagnetic brake or clutch, and a method for manufacturing a suitably improved electromagnetic excitation system that eliminates the disadvantages known from the prior art. These problems are solved by an electromagnetic excitation system with the features of claim 1, an electromagnetic brake or clutch with the features of claim 9, and a method for manufacturing an electromagnetic brake with the features of claim 11. Further developments of the invention are specified in the dependent claims. The electromagnetic excitation system according to the invention for an electromagnetic brake or clutch with the features of claim 1 comprises an electromagnet and a permanent magnet. The electromagnet comprises a pot- and ring-shaped housing arranged around a longitudinal axis and an excitation coil. The pot- and ring-shaped housing has an inner ring section, an outer ring section and a bottom section connecting the inner ring section and the outer ring section. Furthermore, the excitation coil is inserted into the housing between the inner ring section and the outer ring section, and a free end of the outer ring section forms a magnetic pole. Furthermore, it is provided that the permanent magnet is arranged on a flange on the side facing away from the excitation coil. The flange can also be arranged on the side of the excitation coil facing away from the base section and can project from the inner ring section to the outer ring section, forming an air gap between the flange and the outer ring section. The present invention is based on the idea of proposing an electromagnetic excitation system with a particularly compact design. Unlike, for example, in the WO 2006 087 017 A1 The permanent magnet is not formed in a sleeve-like shape around the longitudinal axis with radial magnetization, but rather in a disc or disc-ring shape and preferably axially magnetized. When the electromagnet is de-energized, the magnetic field lines in the flange divide into a main flux and a secondary flux through the air gap, forming a magnetic circuit around the housing and the excitation coil. In the outer ring section, the main flux and the secondary flux merge and flow back to the permanent magnet. When the electromagnet is energized, the magnetic field of the excitation coil displaces, redirects, or neutralizes the magnetic field of the permanent magnet in the region of the magnet pole and the armature plate. For example, if the electromagnetic excitation system is used in a brake, the brake can be released by energizing the electromagnet. This means the brake opens, and the motor shaft, for example, could rotate again. Furthermore, it has proven advantageous if the air gap acts as a magnetic resistance and as a secondary air gap in the magnetic circuit of the permanent magnet. In particular, the air gap acts as a magnetic resistance and as a secondary air gap in the magnetic circuit of the permanent magnet when the electromagnet is not energized. A further development of the present invention provides that the permanent magnet and/or a free e