How do machines like MRI that use large freely rotating pieces with sensors and tools attached deliver power and send/recieve data, I don’t think they would have miles of cables on a spool thats ready to be wound back and forth?
In: 163
Surprisingly not much different than a steering wheel in your car. electricity and data can move from one piece of metal to another even when they are moving with respect to each other.
edit: I’m wrong that’s not how they work now
Surprisingly not much different than a steering wheel in your car. electricity and data can move from one piece of metal to another even when they are moving with respect to each other.
edit: I’m wrong that’s not how they work now
In addition to slip rings there is also:
* Inductive coupling. An electromagnet on the frame induces power in a coil on the rotating part. Same principle as wireless phone chargers.
* Batteries in the rotating part powering a wireless radio link. That’s how car Tyre Pressure Monitoring Sensors (TPMS) work. The obvious down side is having to replace batteries, keeping the whole unit balanced and how the battery responds to centrifugal force.
* Optical encoders. Passive (non powered) when you need to know the position of the rotating part without
needing to have an active sensor inside it.
* Clock spring. Used in car steering wheels. It’s a long thin ribbon of wires that coils up more tightly when the wheel turns. Obviously only useful when the wheel is limited to a few revolutions before being unwound again
In addition to slip rings there is also:
* Inductive coupling. An electromagnet on the frame induces power in a coil on the rotating part. Same principle as wireless phone chargers.
* Batteries in the rotating part powering a wireless radio link. That’s how car Tyre Pressure Monitoring Sensors (TPMS) work. The obvious down side is having to replace batteries, keeping the whole unit balanced and how the battery responds to centrifugal force.
* Optical encoders. Passive (non powered) when you need to know the position of the rotating part without
needing to have an active sensor inside it.
* Clock spring. Used in car steering wheels. It’s a long thin ribbon of wires that coils up more tightly when the wheel turns. Obviously only useful when the wheel is limited to a few revolutions before being unwound again
In addition to slip rings there is also:
* Inductive coupling. An electromagnet on the frame induces power in a coil on the rotating part. Same principle as wireless phone chargers.
* Batteries in the rotating part powering a wireless radio link. That’s how car Tyre Pressure Monitoring Sensors (TPMS) work. The obvious down side is having to replace batteries, keeping the whole unit balanced and how the battery responds to centrifugal force.
* Optical encoders. Passive (non powered) when you need to know the position of the rotating part without
needing to have an active sensor inside it.
* Clock spring. Used in car steering wheels. It’s a long thin ribbon of wires that coils up more tightly when the wheel turns. Obviously only useful when the wheel is limited to a few revolutions before being unwound again
Sidenote/question: As far as I remember, MRIs don’t use huge spinning pieces – CT scanners do!
Or am I wrong here?
MRIs use and strategically placed coils that act like magnets, antennas and receivers.
Sidenote/question: As far as I remember, MRIs don’t use huge spinning pieces – CT scanners do!
Or am I wrong here?
MRIs use and strategically placed coils that act like magnets, antennas and receivers.
Sidenote/question: As far as I remember, MRIs don’t use huge spinning pieces – CT scanners do!
Or am I wrong here?
MRIs use and strategically placed coils that act like magnets, antennas and receivers.
Electric contact pads, they aren’t as efficient as a cable but they work well.
In the inside there is a pad with a wire attached to it and the same on the outside, these pads are touching but not glued or soldered.
Electric contact pads, they aren’t as efficient as a cable but they work well.
In the inside there is a pad with a wire attached to it and the same on the outside, these pads are touching but not glued or soldered.
Latest Answers