摘要:
An inductive rotary joint system has a one phase rectifier for receiving a one phase AC input, generating a comparatively lower DC voltage, and a three phase rectifier for receiving a three phase input, generating a comparatively higher DC voltage. An AC power generator generates an AC signal from the DC voltage, which is coupled by an inductive rotary joint to a load at the rotating side. When being connected to the one phase AC input only, the AC power generator receives a comparatively lower DC voltage and therefore couples a comparatively lower voltage to the load. In the case of being connected to the tree phase AC input, the AC power generator receives a comparatively higher DC voltage and therefore couples a comparatively higher voltage to the load. A control unit located at the secondary side for controlling at least the load is connected to measure the voltage produced for the secondary side, and to distinguish between a comparatively lower voltage and a comparatively higher voltage. For the case that is a comparatively higher voltage, an x-ray tube is enabled within the load.
摘要:
An inductive rotating power transfer circuit, preferably for transferring electrical power from the stationary part to the rotating part of a CT scanner comprises an inductive power transformer having a stationary primary side and a rotating secondary side. The secondary side is connected via a rectifier to a filtering capacitor, delivering electrical power to a load. One of the output pins of the filtering capacitor is connected to a secondary ground at the rotating part which is further connected to a stationary protective ground via a galvanic slip ring. In the case of a short circuit between a secondary transformer winding and the secondary ground, the secondary winding is partially short-circuited by one of the rectifier diodes. This causes an asymmetric current load at the primary side and a current flowing through the slip ring. Both currents may be used to detect a failure of the secondary winding.
摘要:
A slip ring module (10) comprises a body (11) holding a plurality of sliding tracks (12). The sliding tracks have a T-shaped cross-section with a support portion (15) and a contact portion (13) further providing a contact surface (14). A slip ring brush, which may be a wire brush or carbon brush, is sliding on the contact surface to provide contact to the slip ring module which may rotate against the brush. The contact portion is wider than the support portion, resulting in an enlarged creepage distance (40) at the surface of the body. This further results in an increased isolation and life time of the slip ring module.
摘要:
A slipring assembly comprises a slipring module (10) having at least one slipring track (17,18,19), which is in electrical contact with at least one slipring brush (21,22). The slipring module comprises an isolating body (13) holding the at least one slipring track (17,18,19). Furthermore a cooling element (60) is embedded into or attached to the slipring module (10) to remove heat from the slipring module (10) and to decrease the temperature of the at least one slipring track (17,18,19). This allows decreasing the temperature of the slipring module (10) and increasing the maximum transferable power and lifetime.
摘要:
A slip ring has a slip ring track with a contact area, the contact area containing a plurality of pores or cavities. A lubricant is held within these pores and cavities and is enclosed by a top coating. When a slip ring brush is sliding over the slip ring track, it rubs off particles of the top coating, therefore opening some of the pores or cavities which release parts of the lubricant contained therein. This lubricant reduces surface friction of the slip ring brush at the slip ring track and therefore further wear, which results in an extended lifetime.
摘要:
The lifetime of sliding contact surfaces of a precious metal or a precious metal alloy can be enhanced by embedding at least one nano particle in the layer forming the sliding contact surface.
摘要:
A slipring assembly comprises a slipring module having at least one slipring track which is in electrical contact with at least one slipring brush. The slipring module comprises an isolating body holding the at least one slipring track. Furthermore a heating element is embedded in the slipring module to generate heat within the slipring module and to increase the temperature of the at least one slipring track. This allows increasing the temperature of the slipring module to an optimum operation temperature and further to remove humidity from the surface of the slipring track.
摘要:
An optical rotating data transmission device for polarization-maintaining transmission of linearly polarized light includes at least one first collimator for coupling on first light-waveguides, and also a second collimator for coupling on second light-waveguides, the second collimator being supported to be rotatable relative to the first collimator about a rotation axis. At least two λ/4 plates for converting linear polarization to circular polarization and vice-versa are provided in between a plate for attaching optical fibers and a micro lens system.