[chbot] ESCs for RC models

[Geoff]

Many RC car escs have a brake which turns on when you go from forwards to
backwards. This is quite poor for skid steer vehicles. At least, that was
my experience with two different car ESC's. I think you'll be hard pressed
to find some without brakes. You'll also have issues finding ones rated at
24v as this is 6s lipo which is higher than most RC gear, and higher than
any cheap RC gear.


There are some not-so-expensive dedicated motor drivers such as the Cytron
13A which, coupled with a microcontroller to decode the servo signal, would
work well. We used the cytron 30A for a fairly serious robotics project
(mobile robot weighing ~150kg) and they worked very well - much better than
other supposedly higher rated controllers)
https://www.robotshop.com/en/cytron-13a-5-30v-single-dc-motor-controller.html
However, sourcing these locally is likely to be impossible.

Geoff

On 23 Feb 2018 2:49 a.m., "Andrew Errington" <erringtona at gmail.com> wrote:

> Hi Synco,
>
> Thanks for replying. I'm sorry, I should have mentioned the motor type.
> Simple brushed dc motors.
>
> I could build something, but I'm looking for an off-the-shelf module.
> Popular and cheap fits the bill.
>
> Thanks,
>
> Andrew
>
> On Feb 23, 2018 2:14 PM, "Synco Reynders" <synco.reynders at gmail.com>
> wrote:
>
>> Hi Andrew,
>>
>>   What type of motor are you going to be using?? If you are considering
>> brushless, then because it's a traction application you'll most likely need
>> a motor with position feedback (hall-effect sensors).
>> If it's a brushed motor, things get a lot simpler since the controller
>> only needs to use PWM to control the current.
>>
>> Synco
>>
>> On 23 February 2018 at 08:53, Andrew Errington <erringtona at gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> Apropos of nothing in particular, I am looking for advice on what ESC to
>>> buy to run a couple of motors on a skid-steer robot platform.
>>>
>>> I know there are several to choose from, and ones for boats are
>>> different to ones for cars. I will need two of them.
>>>
>>> If anyone is into this and can recommend a specific module I'd be happy
>>> to hear about it.
>>>
>>> Specifications:
>>> Handle up to 24V at around 10A.
>>> Variable speed forward and reverse across the typical servo timing pulse
>>> range, with a stop band in the middle.
>>> Probably non-braking.
>>> Not expensive (between NZ$10 and NZ$20 each).
>>> Available in Christchurch or NZ from a store or TradeMe.
>>> BEC output not necessary.
>>>
>>> Any tips or pointers welcome.
>>>
>>> Thanks,
>>>
>>> Andrew
>>>
>>>
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>>
>>
>>
>> --
>> Synco Reynders
>>   m: +64 21 1825332 <+64%2021%20182%205332>
>>   e: synco.reynders at gmail.com
>>
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