Brushed motors , can I slow start them ?

[Rolly_g2002]

Does any one know if it is possible to slow start power from a lithium battery to a brushed motor ?. Reading into this there's a lot of forums that say lithium batteries are to aggressive on the brushed motors. Trying to work with a 18 to 24 v motors.

 

[rjenkinsgb]

My first thought would be a speed controller, something along these lines:

Motor Stepless Variable Speed Control Controller Switch 12V 24V Max 20A PWM DC | eBay

The speed regulator uses PWM technology, which has the characteristics of high conversion efficiency, wide speed regulation range and stable performance. -DC 9V~60V DC Speed Regulator. Speed principle:Current regulation.

www.ebay.co.uk

If you replace the pot with a capacitor and resistor, so each time power is switched on the speed input starts at zero and ramps up, that should give you the soft-start effect. Add a reverse diode across the resistor to quickly reset it when power is switched off.

Or, if the motor load is low, just a power resistor to limit the initial current and short that with a relay after eg. half a second, using a capacitor across the relay coil and resistor feeding it to delay the relay switching on.
Again, a reverse diode across the resistor will give a fast reset.

 

[Rolly_g2002]

You confirmed my thoughts. I purchased a speed control but i wasn't 100% sure if that was enough. Thought I needed a bit more on top of that. Thank you