electromagnetic disk brakes
electromagnetic disk brakes
(OP)
to me it seems like a pretty sound idea using electromagnets to attarct to the disk to pull the brake pads together but i would like some other opinions on my idea
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electromagnetic disk brakes
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RE: electromagnetic disk brakes
TTFN
RE: electromagnetic disk brakes
The magnet would clamp to the stud side of the brake drum and the rotation of the wheel would push or pull a lever which actuated the brakes, pressing the brake shoes against the outer rim of the drum in the same manner a hydraulic cylinder would.
What would be your application?
I remain,
The Old Soldering Gunslinger
RE: electromagnetic disk brakes
now that more thought is put into to it a hydaulic brake shoe and disk could be adapted to work with this principle
RE: electromagnetic disk brakes
RE: electromagnetic disk brakes
just cause I dont know; What is a good estimate of normal forces exerted by common 1-piston calipers? I know Goodridge tested my brake lines to like 3000psi. which woudl in the application have nominal pressures ~1200-1500psi. But I dont know the piston area in order to calc. the forces.
RE: electromagnetic disk brakes
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: electromagnetic disk brakes
Some type of cam, gearing or lever system could produce the forces required - extra complications but . . .
RE: electromagnetic disk brakes
For starters try
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You may want to take time off work to learn another language if you want to read these . . .
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RE: electromagnetic disk brakes
The whole electrical system would need to be upgraded to supply enough power to keep it working. All a very serious problem on a bike.
Eddy current brake retarders are used on large trucks and work well, but they are neither small or light weight. Jacobs engine compression brakes are far more popular.
How about using compression braking on your bike ? The sound would be unique ! But it could only work on the back wheel unfortunately.
RE: electromagnetic disk brakes
RE: electromagnetic disk brakes
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: electromagnetic disk brakes
In another thread, there has been a discussion of Engine Braking and how some feel it shouldn't be done. Losing the electrical system and brakes would necessitate engine braking...
IM not so HO, braking systems should be powered from a seperate source in the same way the instruments on an aircraft are not all powered from the same source.
I remain,
The Old Soldering Gunslinger
RE: electromagnetic disk brakes
That reminds me of a proposed unique emergency braking system I saw many years ago for large trucks. The idea was that a couple of heavy wedges attached to long chains could be released on either side ahead of the rear wheels.
These wedges could be dropped onto the ground in front of the rear wheels, the rear wheels riding up onto the wedges. The chains snap tight, and the whole truck drags to a fairly rapid halt. Rather primitive, but clever, I wonder what happened to that idea ?
RE: electromagnetic disk brakes
RE: electromagnetic disk brakes
RE: electromagnetic disk brakes
RE: electromagnetic disk brakes
So do railroad trains in North America, after a fashion. The trains use air pressure in a reservoir to set the brakes. This pressure pushes a piston which applies the brakes. A counter pressure is put against the other side of the piston releasing the brakes. If there is a train separation, the air rushes from the brake pipe and the train’s brakes are set. The air can be released from the locomotive gradually to allow an even slowing of the train, or the brakes can be set in emergency from the locomotive as well. It is a system invented by George Westinghouse a hundred and some-odd years ago. I understand that some European countries at one time used vacuum brakes, or perhaps they do to this day, the only difference is that one sucks and the other blows. The train stops (hopefully) and all’s good with the world.
When I tell people that I play with trains, they ask “What Gauge?” I say “Standard, Four Feet, eight and a half inches” I love the looks I get almost as much as shoving the Johnson Bar forward a notch or two, Blowing the 4-chime steamboat whistle, opening the cylinder valves and the throttle valve and pulling the Consolodation Steam locomotive out of the station with a load of daytrippers.
I remain, Electrical Engineer and Steam Locomotive Engineer…does it get any better than this?
The Old Soldering Gunslinger
Oh yeah, it isn’t any better than waiving to the people who stop their autos along the right of way and the little children who waive and grin. --SGS
RE: electromagnetic disk brakes
RE: electromagnetic disk brakes
I was racing a motorbike some years ago when I was hit by another bike, the impact damaged my brakes locking them on whilst I was still doing 70mph. I can tell you its no fun being on bike that can suddenly and unexpectedly apply its own brakes.
Keep working on it I'm sure there is a way around the problems.
Karl.
RE: electromagnetic disk brakes
> if power is lost, brakes lock if using the spring hold-back, which is bad, since that means that you are unable to coast to a safe stop
> if only the alternator is lost, the power consumption would kill the battery faster than if you only had to power the lights.
> the magnetic clutch on my A/C is already way bigger than my brake caliper, and provides less force
> trying to use spring load means that a strong spring requires that much more of a strong magnet to pull it back
> the hold back of the spring requires constant power consumption from the vehicle, which means lower gas mileage
> there would need to be a fairly complicated and complex electronic feedback control circuit to provide the same behavior that a normal braking system would have
> ditto for providing feedback to the driver's foot
TTFN