Machine an aluminium disc and pipe such that they fit snugly together but the disc can slide down the pipe? That's a great idea.
Here is a paper on a motor design that looks interesting:
https://www.ijedr.org/papers/IJEDR1703070.pdf
https://www.ijedr.org/papers/IJEDR1703070.pdf
Something like that 🙂 Seems the only point of large excursion is to reduce surface area, I can't see anything working well in that regard TBH, what kind of enclosure? a resistance cardioid might work
https://www.techunited.nl/media/fil...tuator_for_high_acceleration_applications.pdf
this paper describes an axial magnetised topology that will be way easier to DIY
this paper describes an axial magnetised topology that will be way easier to DIY
Here are some links to high speed linear actuators:
linear-actuators
Tubular High-Speed Linear Actuator (PA-15)
Linear Actuators | Aerotech, Inc.
the progressive automation one is cheap enough to play with but looks marginal on weather its fast enough, I will look into it.
linear-actuators
Tubular High-Speed Linear Actuator (PA-15)
Linear Actuators | Aerotech, Inc.
the progressive automation one is cheap enough to play with but looks marginal on weather its fast enough, I will look into it.
Think I'm probably off on my own here in my obsession with non voice coil actuators for bass reproduction. Even Danley Soundlabs is using conventional drivers these days.
My current thinking on this is that I should run the numbers on the PA-15 actuator as it has low development burden compared to making my own actuator and I presume the fully instrumented higher speed actuators are way too high cost. For the 'cone' I was thinking of using foam insulation board as its very light for its stiffness and I can cut it easily. For the frame aluminum interlocking channel and for the surround cut up inner tubes (although this is not ideal as they would be not stiff enough and a bit lossy). Initially I would run the actuator open loop.
The missing bit I didn't know how to work out was the spring force felt by the cone but I found this:
http://rmsacoustics.nl/papers/whitepapersoundgeneration.pdf
which looks to cover it.
My current thinking on this is that I should run the numbers on the PA-15 actuator as it has low development burden compared to making my own actuator and I presume the fully instrumented higher speed actuators are way too high cost. For the 'cone' I was thinking of using foam insulation board as its very light for its stiffness and I can cut it easily. For the frame aluminum interlocking channel and for the surround cut up inner tubes (although this is not ideal as they would be not stiff enough and a bit lossy). Initially I would run the actuator open loop.
The missing bit I didn't know how to work out was the spring force felt by the cone but I found this:
http://rmsacoustics.nl/papers/whitepapersoundgeneration.pdf
which looks to cover it.
Nah, it was a rotary motor that was driving some cones via a belt.
The belt would eventually stretch out and need replacement.
Chris
In Profile: Tom Danley, Exploring The Possibilities Of Audio Technology - ProSoundWeb
The servo drive used a brushed DC motor. A modern version using a BLDC motor would be better in every way. The belts would still stretch though and the suspension would need to change to allow more xmax.
Also from the man himself:
Why no other "motor" driven designs ie BassTech7
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