Search

EP-4736206-A1 - ROTARY ACTUATOR

EP4736206A1EP 4736206 A1EP4736206 A1EP 4736206A1EP-4736206-A1

Abstract

The invention relates to a rotary actuator (1), comprising: - a stator (10), - at least one stator coil (11) which is connected to the stator (10) in such a way that a force acting on the stator coil (11) is transmitted to the stator (10); - an armature (20) which is rotatable about an axis of rotation (2) relative to the stator (10), - at least one armature coil (21) which is connected to the armature (20) in such a way that a force acting on the armature coil (21) is transmitted to the armature (20); - power lines (3) which can be used to energize the at least one stator coil (11), - cables (4) which can be used to energize the at least one armature coil (21), - a rotational angle limiting device (5) which is used to limit a rotation of the armature relative to the stator to a rotational angle range of from 0 to 359 degrees.

Inventors

  • TSCHIESCHE, RALF
  • STRACKE, PETER
  • LECHELER, STEFAN

Assignees

  • Siemens Aktiengesellschaft

Dates

Publication Date
20260506
Application Date
20240731

Claims (15)

  1. 1. Rotary actuator (1), comprising: - a stator (10), - at least one stator coil (11) connected to the stator (10) in such a way that a force acting on the stator coil (11) is transmitted to the stator (10); - an armature (20) rotatable about an axis of rotation (2) relative to the stator (10), - at least one armature coil (21) connected to the armature (20) in such a way that a force acting on the armature coil (21) is transmitted to the armature (20); - electrical lines (3) through which at least one stator coil (11) can be energized, and - electrical lines (4) through which the at least one armature coil (21) can be energized.
  2. 2. Rotary actuator according to claim 1, wherein the at least one stator coil (11) and the at least one armature coil (21) are connected in series.
  3. 3. Rotary actuator according to one of the preceding claims, wherein the number of pole pairs of the armature (20) and the stator (10) are the same.
  4. 4. Rotary actuator according to one of the preceding claims, comprising an electrical energy storage device (6) which can discharge its charge into the at least one stator coil (11) and/or at least one armature coil (21).
  5. 5. Rotary actuator according to one of the preceding claims, comprising a control unit (7) which controls the energization of the at least one stator coil (11) and the at least one armature coil (21).
  6. 6. Rotary actuator according to claim 5, wherein the control unit (7) is configured to control an electronic reversal of the coils (11, 21).
  7. 7. Rotary actuator according to one of the preceding claims, wherein the at least one stator coil (11) and the at least one armature coil (21) overlap radially.
  8. 8. Rotary actuator according to one of the preceding claims, comprising a rotation angle limiting device (5) by which a rotation (25, 26) of the armature (20) relative to the stator (10) is limited to a defined rotation angle range.
  9. 9. A method for operating the rotary actuator according to any one of claims 1 to 8, wherein a current pulse triggered by an angular position (cp) of the armature (20) relative to the stator (10), causes a braking or acceleration pulse.
  10. 10. The method according to claim 9, wherein several current pulses in succession cause a continuous movement of the armature (20).
  11. 11. The method according to claim 9 or 10, wherein the one or more current pulses cause a current change dl/dt.
  12. 12. Method according to one of claims 9 to 11, wherein in an initial position a first stator coil (11) and an armature coil (21) overlap, a current pulse is triggered which causes a movement of the armature (20) so that the overlap of the first stator coil (11) and the armature coil (21) increases and a further current pulse is triggered when the overlap of the first stator coil (11) and armature coil (21) has decreased again.
  13. 13. Switching device with at least one switch (201), comprising a rotary shaft (209) and a main drive (203) acting on the rotary shaft (209), wherein a movement of a moving contact (205) of the at least one switch (201) is caused by a rotation of the rotary shaft (209), further comprising a rotary actuator (1) according to one of claims 1 to 8, wherein the rotary actuator (1) functions as an additional drive of the switch (201) and the armature (20) of the rotary actuator (1) is arranged in a rotationally fixed manner on and coaxial with the rotary shaft (209).
  14. 14. Switching device with at least one switch (201), comprising a rotary actuator (1) according to one of claims 1 to 8, wherein the rotary actuator (1) functions as a main drive of the switch (201) and wherein a movement of a moving contact (205) of the at least one switch (201) is caused by a rotation of the rotary actuator (1).
  15. 15. Short-circuiter, comprising a rotary actuator (1) according to one of claims 1 to 8, wherein a movement of a closing contact of the short-circuiter is caused by the rotary actuator (1).

Description

Description rotary actuator The present invention relates to a rotary actuator, a method for operating the rotary actuator and various uses of the rotary actuator. Switchgear for low-voltage and high-voltage applications such as load switches, disconnectors or circuit breakers can, due to their design, have two mechanical disadvantages: Firstly, when the switchgear is switched on, i.e. when the contact system closes, the mass of the moving contact and also the mass of the switch kinematics are abruptly stopped at the galvanic contact point, which can lead to contact bounce. Secondly, the two contacts can easily weld together due to arcing. Therefore, when the switchgear is switched off, i.e. when the contact system opens, a so-called separating blow, i.e. a higher force for contact separation, must be generated to loosen or break up any welding in the contact system. Conventional drives for switchgear, which convert the rotary movement of a drive shaft into a linear movement of the moving contact, deliver a more continuous force in precisely this area. For example, these drives for switching devices are spring drives and magnetic drives (classic lifting magnet). To date, attempts have been made to improve the bounce behavior using special kinematics, e.g., levers for controlling the speed profile, or to brake the moving contact shortly before galvanic contact using servo motors and a complex control system. The separation impact, on the other hand, has so far been achieved with additional accelerated masses, which, however, require a higher overall drive energy. Main drives for circuit breakers with vacuum tubes sometimes use linear or rotary drives based on solenoids. These generally have relatively small forces or torques at the start of the movement due to a large air gap, which leads to low efficiency. Therefore, a disproportionately large amount of electrical energy must be expended at the beginning of the movement to start the movement. Until now, the initial force has been increased by special air gap geometries. However, this requires a relatively complicated geometry of the armature and/or stator and reduces the force in the remaining stroke range. Switchgear often has a short-circuiter to extinguish an arc fault before it causes major damage through a metallic short circuit. The short-circuiter must operate within a few milliseconds. Explosives are usually used as the driving force, but this results in contamination of the system and the release of toxic substances. Alternatively, short-circuiters driven by stored spring energy are used, which can sometimes involve considerable mechanical complexity. There is therefore a need for an improved drive that can be used in switching devices, e.g. circuit breakers, and short-circuiters. This object is achieved according to the invention by a rotary actuator having the features specified in claim 1, a method having the features specified in claim 9, a switching device having the features specified in claim 13, a switching device having the features specified in claim 14 and a short-circuiter having the features specified in claim 15. The rotary actuator according to the invention has a stator. The stator has at least one stator coil which is connected to the stator in such a way that a force acting on the stator coil is transmitted to the stator. The rotary actuator- tor has an armature. The armature is rotatable about an axis of rotation relative to the stator. The armature has at least one armature coil which is connected to the armature in such a way that a force acting on the armature coil is transmitted to the armature. The rotary actuator has electrical lines through which the at least one stator coil can be energized. The rotary actuator has electrical lines through which the at least one armature coil can be energized. The object is further achieved according to the invention by a method for operating the aforementioned rotary actuator, wherein a current pulse causes a braking or acceleration pulse. The release of the current pulse is triggered by an angular position of the armature relative to the stator. The object is also achieved according to the invention by a switching device with at least one switch, wherein a rotary actuator according to the invention acts as an additional drive for the switch. The switching device has a rotary shaft and a main drive acting on the rotary shaft. A movement of a moving contact of the at least one switch is brought about by a rotation of the rotary shaft. The switching device also has a rotary actuator, as described above, wherein the rotary actuator acts as an additional drive for the switch. The armature of the rotary actuator is arranged so as to be fixed against rotation on and coaxial with the rotary shaft. If the rotary actuator is correctly designed, the moving contact can be briefly braked or accelerated shortly before it touches the fixed contact when switched on, in order to improve the bounce beh