Small Motor for Medical Application

You need to put more work into your question.

"Rotate power screw" ??

Describe what you call a power screw. Include thread pitch and size of the screw.

What is the stroke, (the distance it has to move.)

Also material of the screw and the block/nut it will turn in.

are you looking for 20kg of; lift, push, ??

Cycle time to extend or retract.

Duty cycle.

Power available for the motor.

As you can see, you are not supplying enough information for anybody to give you an intelligent answer.

this very question was addressed in a treatise by Mary Shelley. Judging from the phraseology and conceptual framework of your question I believe you will find her work on the subject vitally interesting....

Clever . . .

Six Million Dollar Man?

Sounds like it. A motor that can lift 20kg weights.

anastyne, one of the reasons for misunderstanding (or no understanding at all) is spelling mistakes. Your "left wight" mystified me for a while (reminded me of Elmer Fudd, no offense intended). There's a spell checker in the tool bar (a check-mark with ABC on it).

What's a "power screw"? I think you mean something like a screw jack. As the motor runs it turns a screw that moves an arm and lifts your 20kg weight?

I was almost going to make a suggestion but you said that this thing will be inside the human body. That statement threw every idea I had out the window. There's no motor I know that will run inside a person's innards. How are you going to power it? Would it mean that the unfortunate guy will have wires coming out of his chest or something?

If this is a bionic arm then you don't need a very special motor (just special). You could shed some light by providing more information.

Hilarious?

Horrendous?

Inhuman?

Let the poor Guinea Pig die instead.

This is a typical example of someone who doesn't even know how to ask his own question.

Why not invest a little time in thinking?

You want intelligent answers, ask intelligent questions.

Wangito.

really i don't know why are you saying that??

but this is my first question in this forum. and i don't know how to ask peoples like u?

sure when i said some thing in side human body that means small dimensions and the material is stainlesses. you don't know. this is ur problem.

and what about the wires. sure u r wrong because i will get the power from power source has life time more than one year that can do the function. and i don't need the wires out side the man.

finally this project is a great project and stop doing something like this with new visitors.

anastyne,

While some may be rude or downright cruel, the information you provided in your post was indeed inadequate.

How small is small? To fit inside a human body, a motor would have to be anywhere from less than an inch to a maximum of two or three inches. Any bigger than that and you might be crowding the internal organs too much. Able to lift 20kg? For such a small motor? Inside the human body? What is inside the human body that weighs 20kg and needs to be lifted? There are a lot more that I can say but I don't have the time.

Lastly, if you'd taken the time to read the FAQ or Frequently Asked Questions, you'll find this:

Look for answers before you post. Check a search engine or two to see if you can find the answer to your question or a collection of useful links. If it's not or if the answer is unclear, then that's a pretty good justification for asking the question. This is not to stifle questions, but you're less likely to be insulted if you have done a little research ahead of time. (thanks Silas Marner)

It's a harsh lesson maybe but you can't go through life asking questions and assuming that people will immediately understand what you mean or want. Ask the right questions, provide enough, if not complete, information and you'll get the help you need.

Well said, Vulcan.

Anastyne, please don't be discouraged from posting in the future. I'm not sure where you're located, but there's a saying in the States that is true the world round: "Live and learn".

Moose

thanks for ur advice. and i will follow it

i am sry for making mistakes but as i write before this is my first time using forums.

Motor here....

http://www.micromo.com/

this is what i need. thank you

As stated before you don't give enough information for someone to spec a certain motor. I can give you a link to a search page to search for motors, if you know the power you need or torque or voltage then you should be able to find something. As for it being rated to work inside the human body, you will have to address that with a particular manufacturer. Here is a general link to search for DC motors http://motion-controls.globalspec.com/specsearch/searchform/motion_controls/motors/dc_motors and here is a link to search for AC motors http://motion-controls.globalspec.com/specsearch/searchform/motion_controls/motors/ac_motors I hope those can help you, if you would like to provide more specs of the motor you want I can do my best to give you a more precise link or company.

thanks for help

We do not need to start making fun of people seeking information. This guy is obviously not writing in his native tongue and has undoubtedly spent much effort trying to ask his question in a foreign language. This is not easy! I have lived in foreign countries and can attest from experience that asking even simple questions can be difficult. Have a heart.

realy i Respected you.

and thx alot

Anastyne:

Read posting #13 and see if you can answer Vulcan's questions. You most probably can not.

Do you have an Idea of the size of motor and the size of the power source you need for lifting 20Kg?. No you don't. Because if you knew, you would also understand that without a complicated gears, and other accessories you can't do it in a size that will permit implantation.

You have to understand that this is an engineering forum and not a Sunday school. Therefor a certain minimum of entry level must be kept.

You can't expect people to answer your questions when you do not make the list effort to be clear or accurate. If English is your problem, why not ask for help in phrasing your questions from someone who has a better command? You didn't even make an effort to correct your spelling mistakes. The spell checker It is right here. No need to go anywhere.

All of this shows total disrespect to this CR. and the people who participate in it.

There are highly educated people in this CR that are willing to put their knowledge and experience at your disposal, FREE. The minimum that you can do is invest in making yourself clear, and submit your questions intelligently. No one (including me) is trying to insult you. But if you were, Well, draw your own conclusions.

Wangito.

"Let he who is without sin cast the first stone "

You state "make the list effort" - Learn to check your typing/spelling.

"..minimum of entry level.." ! - what right of judgement do you have ?

You may not have intended offence , but it doesn't come across that way.

Dissing somebody because of commuinication problems is intellectual vandalism.

People!

While spelling mistakes are common it does not mean that we should not point them out and we should not be resistant to being corrected. If someone doesn't point out the mistake, you're going to be committing it again and again and you will never learn.

Unfortunately, the spell checker doesn't know that "left" actually means "lift" or "wight" actually means "right". Left is a perfectly valid word as is wight (I just discovered that it means, living being or brave). The spell checker is only a spell checker, it doesn't check for grammar or context.

Typos are a different sort and I will admit that I am sometimes guilty. When you're typing too fast it's easy to miss a key or jumble up the letters. I disagree, however, with the use of abbreviations like "u" for you, "ur" for you are or your, or sentences like "f u r l8" for, if you are late. That's fine for text messages on cell phones, since they're a pain to type on, but not for e-mails, or forums such as CR4.

While I do not agree that people here should have a minimum entry level, I would at least want them to ask their questions properly with as much information as they can give. There are few things more frustrating than having to find a solution to a question with only a few bits of information.

Also, please understand that if you present something new or novel, the people here will try and dissect it and look for improvements, mistakes or possible problems. Sometimes it will help, sometimes it won't but that's the nature of engineers (heaven knows how many times people have tried to point out the flaws in my ideas). It doesn't necessarily mean that they want to steal your idea. If you need to keep a few things secret then come out and say that in the beginning. We'll try to work something out.

"left" actually means "lift" or "wight" actually means "right".

There, see! I've made a mistake. I did another once through of the post and "wight" is actually supposed to be "weight", not "right". Is my face red?

Three cheers I too dislike the jumbled mess some people think is acceptable as english.

I know many are not native english speakers but if they are ever to refine their english they must try harder and also as you so rightly point out use the spell checker first it will not only help make sense of their english but also help them to learn more about our language. Well said sir I say again three cheers.

I can only add a forth cheer.

Wangito

Appreciate your comments, "List"- you are absolutely right.

Sorry that you didn't understand my massage. It is not merely a communications problem. If you don't think so, and you do understand the question, than go-ahead and reply to it, if you can't reply, which I believe is the case, than maybe you can explain what is he trying to ask? Or at least, convince me (better convince yourself) that he did invest in researching the subject, before posting his question.

And as far as command of the English language is concerned, the correct word for "judgment" Should be "analysis".

No one cast the stone, and I guess no one will, including you. Loth (Lot) was the last of them without sin...

And BTW: English is NOT my mother tongue.

Wangito.

Thanks for the responce. It's tricky to know if somebody posting a question is stupid or lazy etc , but i've worked with plenty of people from different countries and have seen good ideas nearly lost because they were not explained clearly. I think it's encumbant on Anastyne to come back with more clarity/detail. Peace dude.

the Dutch move large volumes of water by using windmills...Have you considered an eco-friendly motor like that?

the Dutch (used to)move large volumes of water by using windmills---(No More)

Our Bio-tech GUEST wants to move patient's arms . Patient has no motor nerves?

Really how will a Dutch Windmill help?

MUKUKMAHANT says:

Our Bio-tech GUEST wants to move patient's arms

That's what I thought at first until he mentioned that the motor needs to be inside the human body. If it's an artificial arm, the motor doesn't need to be inside the body and my earlier comment of a pair of wires coming out of the chest would, therefore, be incorrect. The problem is, he mentioned that it is inside the body which caused the confusion (for me at least).

An artificial arm can have a motor that can be up to, say, three inches in diameter. If he puts it inside an artificial skin, it might not need to be hermetically sealed, although that would be preferable. If the motor doesn't need to function too much, heat buildup would not be a problem. To increase the power, he'd need to use reduction gears.

The earlier link to miniature motors might help. RS Components also sells motors from different manufacturers. We use them (RS Components, I mean) all the time.

each dutch windmill has at least 4 arms and apparently biotech's patient has none (and no bowels either after biotech gets finished with him)

Dear sir

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