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Topic: 15A Dual DC H-Bridge Motor Driver (Read 359 times) previous topic - next topic

imdualj

We are making a brainwave controlled wheelchair using NeuroSky EEG headset and Arduino Uno. We have tested the brainwave is working properly however we are having difficulties in using motor driver from China. Is there anyone who have used this driver already. We need some help.

MarkT

Which motor driver?  15A sounds far too little for a wheelchair system.
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imdualj


slipstick

You need a datasheet or manual for that driver not just a picture of it.

Steve

jackrae

The motor you referenced isn't a brushless unit.  Although the header on the advert says it is, further reading says it is commutated by brushes.  Having dismantled some of these in the past I am fairly confident they are 'brushed' 

Generally brushless motors cannot be used on a simple H-bridge as they are polarity sensitive, but if the motor really is a brushed style then reversal of polarity will reverse its direction (they having permanent magnet field poles)

I surmise you will use two of them to give differential steering but you will need a high reduction gearing to get the torque required at the typical low speed of a wheelchair (circa 10km/h)
You'll also need acceleration and deceleration control.

I would suggest you look for 30A H-bridges to give safe duty rating.

I am really interested in how you are using the Neurosky to produce suitable signals for wheelchair use.  Could you please expand on how you are creating the output control signals.

MarkT

We are using the components attached.
A riff file is not useful.  Please repost that as a png/jpg/etc.
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imdualj

#6
Mar 25, 2019, 12:43 pm Last Edit: Mar 25, 2019, 12:44 pm by imdualj


DC 5V 12V 24V 15A Dual H-Bridge DC Motor Driver Module Motor Drive Controller Board for Arduino Robot Car Compatible 3V-36V

This module is from China and I don't know if it is reliable.

MarkT

I repeat 15A sounds far too little for a wheelchair.
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GaryP

I repeat 15A sounds far too little for a wheelchair.
Why? It is the power that count after all? With 12V it is only 180W, 24V equals to 360W, and I guess they are not building a rocket there.

OP didn't tell us enough to make any actual conclusions for this, so... You ca be right as well.
 :)


I am working with 1000W (48V) motor to 86kg toy for my kid, and it probably moves about 35-45km/h, and that is also too much. Wheelchair is not light, I could imagine, so... Who knows what is enough or too much until one is finished.

Cheers,
Kari
The only law for me; Ohms Law: U=R*I       P=U*I
Note to self: "Damn! Why don't you just fix it!!!"

MarkT

#9
Mar 25, 2019, 10:19 pm Last Edit: Mar 25, 2019, 10:21 pm by MarkT
Why?
Because I've used wheelchair/mobility scooter motors and motor controllers in various projects
and 24V, 90A is more like the ratings you see - its important to climb curbs and get out of potholes,
that takes lots of peak torque at low speed, the max power on the flat isn't the issue.
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GaryP

Because I've used wheelchair/mobility scooter motors and motor controllers in various projects
and 24V, 90A is more like the ratings you see - its important to climb curbs and get out of potholes,
that takes lots of peak torque at low speed, the max power on the flat isn't the issue.
Ok, thanks, that point is important, I have to add ampere meter with log when project goes wurther, to find out true peaks. Cables are often undersized when you trust your instinct and basic calculations on paper.
 :)

Cheers,
Kari
The only law for me; Ohms Law: U=R*I       P=U*I
Note to self: "Damn! Why don't you just fix it!!!"

MarkT

Basic calculations on paper aren't the problem, if you start with the right numbers!
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

GaryP

Basic calculations on paper aren't the problem, if you start with the right numbers!
You are simplyfying things a bit, sometimes numbers are not available, you have to start carefully creating some parameters with tests. Internet is wonderful place for finding information, but it can't do miracles.

Cheers,
Kari
The only law for me; Ohms Law: U=R*I       P=U*I
Note to self: "Damn! Why don't you just fix it!!!"

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