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Yes, multiple motors can drive a single shaft, and the efficiency should be the same as a single motor driving. But I don't think I've ever seen this done in reality; I think you always end up with a better solution by just specifying a bigger single motor.
Given the price of an Mx106, I would have no problem spending $100 on a motor to get that type of power/size ratio, I just am not finding them commercially available to purchase.
A few more clarifying questions:1) How come you can you fit multiple smaller motors, but not one bigger motor? 2) What are your actual requirements for cost and power?3) Have you considered over-volting some of the motors you can find? 1.4* voltage means 2* power.4) Have you considered all motor kinds: brushless, coreless, etc?5) What makes you think Robotis can purchase those motors for less than $100? The brand of the motor is actually published in the specs; have you looked for a supplier for that motor?The Maxon RE-MAX (used in the MX-106) is about $206 in singles straight from Maxon. It's also a 24V motor, so perhaps they are under-volting it, or getting a custom build. When buying in volume, I expect they pay less, but it's quite possible they pay more than $100 even in volume.I looked into building my own servos, and it just isn't worth it IMO. I'm not going to save a lot of money, and I'm going to waste more than I save in the cost of failed experiments, not even counting the value of my time. Thus, I came to the conclusion that I either find the money to buy the servos I need, or I live with the fact that I can't get the level of power I would like.
how do you know exactly which Re-max it is?
Quotehow do you know exactly which Re-max it is?I don't know exactly! In fact, all the listed Re-max motors are 24V motors, which makes me wonder whether they got a custom wound version, or whether they use the 24V version and undervolts it for longevity.You could call Maxon and ask them what they think about your particular application. They probably have sales engineers who answer that precise kind of question!
that is about 6 timex stronger than an Mx106
Quotethat is about 6 timex stronger than an Mx106One difference is that the MX-206 is run at 12V, not 24V -- this is a 4x difference assuming it's the same motor.If you also use a different gear box ratio to get to 60 rpm instead of 40 rpm, you get another 1.5x difference.4x * 1.5x == 6x, so that would almost exactly explain the difference you suggest.
The motor I was basing this off of was a 12V maxon motor, not a 24, so am I missing something here?
not like reading specs from pololu or trossen
QuoteThe motor I was basing this off of was a 12V maxon motor, not a 24, so am I missing something here?It's quite possible that the MX-106 uses a smaller one, then.You could have MOAR POWAR!!!Quotenot like reading specs from pololu or trossenHence, why places like Pololu and Trossen exist. They use their expertise to figure out things to try. Then they try things, some of which work. Then, the things that they try and that work, they actually sell, with packaging/descriptions/support for the hobbyist. They charge a mark-up for this service, but for someone who's not a professional and doesn't necessarily know how to decipher a data sheet or speak to an applications engineer, that mark-up is totally worth it!
I know that each gear you add costs you about 10% efficiency for one motor per output shaft, so I am wondering if the same holds true for multiple motors per output shaft?
Quote from: ErikY on March 05, 2013, 04:21:19 PMI know that each gear you add costs you about 10% efficiency for one motor per output shaft, so I am wondering if the same holds true for multiple motors per output shaft?I've never heard this before, where did you get this stat from?
hello everyone I have a maxon brushless motor ec 45 flat and it is jammed so just i wish to open it can anyone post a procedure to open it. It would be very gratefull