Magnetic linear actuator

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File (hide): 8a17b7a4d859b64⋯.gif (21.87 KB, 429x368, 429:368, main-qimg-4480dcbffe0ac5d4….gif) (h) (u)

▶Magnetic linear actuator Anonymous 02/03/19 (Sun) 19:53:47 No.1026744>>1026801 >>1026835 >>1027225 >>1027317 [Watch Thread][Show All Posts]

Iv been looking for actuators for my project.

I need an actuator that can travel 40cm within a second and have about 100kgf, both hydrolic and electric (dc motor) are too slow, pneumatic may do the job but i'd rather have something simple, the doesn't require a compressor and a tank.

I tryed googling electro magnetic actuators but beside control valve system it seems that they don't exist.

Why is that ?, what downside do they have ?.

For the record an electro magnetic actuator would work the same way a speaker does.

▶Anonymous 02/03/19 (Sun) 20:01:46 No.1026747>>1026751 >>1026785

What language do you speak natively?

▶Anonymous 02/03/19 (Sun) 20:05:42 No.1026751>>1026778

>>1026747

French, why ?

▶Anonymous 02/03/19 (Sun) 21:11:16 No.1026778

>>1026751

I would have thought some slav language

▶Anonymous 02/03/19 (Sun) 21:30:53 No.1026785>>1026790

File (hide): 5b8650279f3ff57⋯.webm (7.98 MB, 1920x1080, 16:9, Magnets.and.Marbles.webm) (h) (u) [play once] [loop]

>>1026747

Protip: you can know it's French because OP puts a space before "?".

▶Anonymous 02/03/19 (Sun) 21:40:36 No.1026790>>1027245

>>1026785

Is this standard to the French language or just to a specific nation?

▶Anonymous 02/03/19 (Sun) 22:15:53 No.1026801>>1026810

File (hide): a56a9ad3b4801d9⋯.png (131.14 KB, 1280x960, 4:3, 1280px-Cylindrical-magnet-….png) (h) (u)

>>1026744 (OP)

This is not an easy problem, but in most simple form you can calculate magnetic force by using F = B^2 * A / (2u0) (eq. 1) (B is flux density in T, u0 permeability of vacuum). Problem here is that you can get high force only with increase of the area since magnetic materials saturate at 2 T. If I understood your problem correctly you want to move 100 kg object 40 cm in 1 s. That would require about 80 N of constant force (assuming no friction and external forces, object slides freely on the ground). Plugging in numbers in to equation (eq .1) yields area of 50 um^2, which is area of 7x7 mm square, which seems awesome unitl you realize that this is only valid if objects are very close to each other (think electromagnet that lifts cars at scrapyard). As soon as you apply some distance force exerted drops off very quickly pic related. For speakers this is not a problem since movement is relatively small, but for use as an actuator this is a problem. There are some commercial solutions namely voice coil actuator, but they have short stroke and are weak http://www.moticont.com/linear-motor-with-bearing.htm Pneumatic solution is probably a better choice.

▶Anonymous 02/03/19 (Sun) 22:30:36 No.1026810>>1026822

>>1026801

i found this https://www.kunlintech.com/product/tubular-linear-motor/#tab-c0cdc1f35fc97e6cfad

seems to be what im looking for however i have doubts about is efficiency.

how much of my electiricity will be turned into heat instead of kenetic energy.

can't really go go for pneumatic after reading how horribly ineficent they are, also notoriously unrealiable.

i wish there was a chart to compare.

▶Anonymous 02/03/19 (Sun) 23:10:40 No.1026822>>1026826

>>1026810

There will be high I^2 R losses, but that's the cost of the performance. It shouldn't be too bad if you only need pulsed power, but since they state:

>360 degree surounded water cooling structure realizes the best thermal conductivity efficiency

It'll probably get quite hot if you need holding force. I would imagine those motors aren't exactly cheap either.

▶Anonymous 02/03/19 (Sun) 23:25:14 No.1026826>>1026832

>>1026822

no, no holding force, constante move back and forth

▶Anonymous 02/03/19 (Sun) 23:46:26 No.1026832

>>1026826

Just use a rotary motor with a conversion mechanism of your choice

▶Anonymous 02/04/19 (Mon) 00:14:17 No.1026835>>1026878

>>1026744 (OP)

are you making an exoskeleton?

▶Anonymous 02/04/19 (Mon) 02:23:46 No.1026878

>>1026835

Something like that

▶Anonymous 02/04/19 (Mon) 02:54:33 No.1026882>>1027046

Are you building a dildo Anon?

▶Anonymous 02/04/19 (Mon) 13:54:15 No.1027046

>>1026882

▶Anonymous 02/04/19 (Mon) 19:57:17 No.1027225

>>1026744 (OP)

Anybody could be an engineer if everything they could imagine was an off the shelf part. Your duty is not to work within the confines of your imagination, it's to work within the confines of reality. 40cm within a second, magnetically sounds like the pipe dream of somebody who hasn't started with what they have.

▶Anonymous 02/04/19 (Mon) 20:21:54 No.1027245

>>1026790

I know it's normal in France, no idea if it's part of the language elsewhere.

▶Anonymous 02/04/19 (Mon) 21:50:59 No.1027275>>1027326

Motor, gearbox, timing belt. Maybe some kind of linear guide. Size according to requirements.

Alternatively search for an off the shelf solution.

▶Anonymous 02/05/19 (Tue) 01:18:08 No.1027317

File (hide): 6d5c158bd75e786⋯.jpg (169.31 KB, 2000x1500, 4:3, mil34_1.jpg) (h) (u)

>>1026744 (OP)

Your specs describe a 400 watt (mechanical) device so it should be trivial to build using off-the-shelf electric motors, guide rails, and lead screw or timing belt, whichever you prefer. For example, you can use a servo rated for 800 watt directly driving a lead screw, nut being attached to an extension rod. Alternatively, you can use the same servo to drive a timing pulley, with the belt stretched across the actuator body, and extension rod connected to the middle of the timing belt on one side.

▶Anonymous 02/05/19 (Tue) 01:54:33 No.1027326

>>1027275

That's a little out of the "off-the-shelf" league, you'll have to build it yourself. But individual parts are well within such league so you don't need to actually forge your own guide rails or build a motor.

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