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Power Reduction Query

Keetybwoy

Apr 8, 2018
6
Joined
Apr 8, 2018
Messages
6
Hi Everyone,

I have a remote control lorry which is too fast and impossible to control, so I need to slow it down somehow.

It has a 4.8v - 0.4A battery.
On my first attempt I bought and fitted a variable speed module (PWM Lo Voltage DC 1.8v, 3v, 5v, 6v, 12v 1803BK 1803B Motor Module).

It works but can't fine tune it. It ranges from not moving to about 75% power with the smallest of adjustments. My next thought is to fit a resistor, but I don’t know which size I would need or whether I fit it to the positive / negative or both??

I would gratefully appreciate some advice on this please.

Thanks.
 

Bluejets

Oct 5, 2014
6,583
Joined
Oct 5, 2014
Messages
6,583
PWM module would be the best approach.

Is the drive direct or through a gearbox of some description.

Show the specs of the speed control you have and the motor details.
 

Martaine2005

May 12, 2015
4,669
Joined
May 12, 2015
Messages
4,669
What RC lorry have you got?
It might be as simple as lowering the voltage (cheap toy).
The PWM module might not function properly if the lorry’s receiver is proportional.
But as already asked, I’ll wait for your answers.


Martin
 

Keetybwoy

Apr 8, 2018
6
Joined
Apr 8, 2018
Messages
6
Hi,
There isn't a gearbox.
I've attached a picture of the PWM.
What about fitting a resistor?
Thanks
 

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Bluejets

Oct 5, 2014
6,583
Joined
Oct 5, 2014
Messages
6,583
Fit a motor with a gearbox....
Sounds like it is too much load for direct drive voltage reduction of any kind.
Gearmotor approach would normally fix the problem
 

CircutScoper

Mar 29, 2022
300
Joined
Mar 29, 2022
Messages
300
Hi Everyone,

I have a remote control lorry which is too fast and impossible to control, so I need to slow it down somehow.

It has a 4.8v - 0.4A battery.
On my first attempt I bought and fitted a variable speed module (PWM Lo Voltage DC 1.8v, 3v, 5v, 6v, 12v 1803BK 1803B Motor Module).

It works but can't fine tune it. It ranges from not moving to about 75% power with the smallest of adjustments. My next thought is to fit a resistor, but I don’t know which size I would need or whether I fit it to the positive / negative or both??

I would gratefully appreciate some advice on this please.

Thanks.

A series stack of rectifier diodes (e.g. 1N5400 or 1N5404) in series with the motor might be a better solution than a resistor because speed regulation would be better. Each diode would subtract about 0.7V from the motor drive and (very) roughly 20% from the speed. So two or three should cut it by half and so forth.
 
Last edited:

Keetybwoy

Apr 8, 2018
6
Joined
Apr 8, 2018
Messages
6
A series stack of rectifier diodes (e.g. 1N5400 or 1N5404) in series with the motor might be a better solution than a resistor because speed regulation would be better. Each diode would subtract about 0.7V from the motor drive and (very) roughly 20% from the speed. So two or three should cut it by half and so forth.
Hi CircutScoper,
Thanks for your advice, I'll give it a go :)
 
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