Slip ring unit

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The slipring unit is a special assembly of radar devices . In the case of a radar device with a constantly rotating antenna, not only the transmission energy must be transmitted from the fixed part (stator) of the turntable to the rotating part (rotor) using an HF rotary transmitter, but also supply voltages and a variety of switching and control signals as well as data lines.

Gold-plated slip rings on a cylinder for power transmission in a rotatable radar antenna. On the right the springy sliding contacts

The picture shows parts of a slipring unit of the Meteor 1500 weather radar device from Gematronik . In an insulating support cast from plastic, annular contact surfaces are embedded on which a spring contact enables the flow of current during rotation. The surfaces are hard gold-plated. In order to work with as little wear as possible, the contact spring presses as weakly as possible, but still sufficiently strong for a reliable current flow against the rotating annular contact surface.

In most cases, the slipring unit not only contains sliding contacts, but it also has to transmit high-frequency energy that is brought in via waveguides or coaxial cables , for example . High-frequency energy cannot be transmitted via sliding contacts, as this would result in too many losses. The transmission of the high frequency is then transmitted from the static part of the slipring unit to the rotating part via rotary joints .