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Old 07-14-2014, 09:42 AM   #21
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Default Re: Motor-in-wheel Crawler?

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Originally Posted by wings_of_fire View Post
Motor in wheel can be done for rc crawlers.

Instead of using complex gearing to match the speed and torque requirement, a micro hydraulic system can give the flexibility and achieve both speed and torque in a small package. A brushless motor is the right power source. All this can easily fit in the small space of a 2.2 crawler wheel.
Hydro could work, but the efficiency would really really suck compared to using regular gears. All the gains made in steering and dig performance would be wiped clean with the larger battery and hydraulic control systems weight.
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Old 07-14-2014, 10:06 AM   #22
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Default Re: Motor-in-wheel Crawler?

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Who is ready to spend $800 in just ESCs and motors?
Guys spend way more than that now on unobtainium housings, gear sets, 300m shafts, ect. That wouldn't be needed.
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Old 07-14-2014, 10:33 AM   #23
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Default Re: Motor-in-wheel Crawler?

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Hydro could work, but the efficiency would really really suck compared to using regular gears. All the gains made in steering and dig performance would be wiped clean with the larger battery and hydraulic control systems weight.
Gears have considerable mass and to change direction immediately or to start rotation, power is eaten up considerably. Where as in hydraulics, power is eaten up mostly in the form of heat generated. However I feel both designs should be considered, designed and prototypes built. As things get smaller and smaller the laws that apply to general size of matter mostly become insignificant.

Hydraulic system can be made lite in weight.Steel is a strong material and through CAE analysis an efficient design can be built from scratch. There are many ways in which weight can be reduced and strength maintained. And there are many ways in which materials can be formed into a matrix.

The hydraulic control system in fact could be the lightest control system that comes to my mind. Have you seen micro solenoid coils by the Lee company? Micro Solenoids can act as servos if necessary, meaning their position of actuation can also be controlled and they can actuate the valves. I feel the size and weight of the hydraulic distributor box would be within limit.

Larger battery would not be needed because this hydraulic system will work as a positive displacement system. Certain number of brushless motor revolutions will be proportional to certain number of wheel rotation. This system would have to be efficiently designed in order to save battery weight.

How much power do you think, would be needed by a single wheel in comp crawling?
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Old 07-14-2014, 10:37 AM   #24
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Default Re: Motor-in-wheel Crawler?

The power needed for one wheel is really the same as the entire vehicle. If you get bound down, you need full torque at the stuck wheel. In this way a hydraulic system could shine with a single larger motor powering everything.
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Old 07-14-2014, 10:52 AM   #25
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Default Re: Motor-in-wheel Crawler?

A single large motor concept would also need an accumulator tank and that will increase weight + the hydraulic lines traveling down to each wheel. I was thinking more about 4 individual brushless motors in each wheel and each of them having their own closed loop hydraulic system. The only connecting wires would be the ones that go to the motor and the ones that control the solenoids.
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Old 06-05-2015, 05:08 PM   #26
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Default Re: Motor-in-wheel Crawler?

...bit of a cheeky dredge up from the depths, but it seems progress has been made in this direction!

https://www.youtube.com/watch?v=8HPGaEMNsY8
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Old 06-06-2015, 08:08 PM   #27
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Default Re: Motor-in-wheel Crawler?

Hole E Chit!!!!
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