Electric ride on lawnmower

[rumleyfips]

I have installed 2 Mophorn 3 phase 2000w motors as blade motors on my ride on electric mower. They need to run at a constant speed . Can I do this without using a throttle epoxyed to full speed ?

 

[amberwolf]

Depends on how the controllers work.

Some controllers require the throttle to be "off" when the system is turned on, and after that they follow what it says to do. However, if the throttle is always at some "on" position, the controller errors out and wont' do anything if it detects this at power-on.

If your controller doesn't do that then you can just install a potentiometer in place of the throttle, and set it to whatever level is needed.

If your controller does do that, you'll need to put a switch between the pot and the throttle signal input of the controller, and turn that on only after the system powers on. (you could attach it to whatever control you have that triggers the blades to run).

If you are willing to learn a bit of electronics you can make a delay circuit so the controler powers up and then is ready for input and then a relay or FET is turned on to supply power to the potentiometer so it then gives a signal to the controller for blade speed.

 

[rumleyfips]

Thanks Amberwolf . tried switching the 5 volt supply to the throttle on and off with no sucess. The trottle has to be off then on irregardless. I had intended to use the elock to switch the blades on and off but that didn't work the throttle has to be off the on each time. I can't use a twist grip throttle when I'm mowing so pots seem like the next step. 'll have to order some from Amazon and find a mounting place.

 

[H2Guy]

Think if it were me I would still want an E-Stop on the blades then a simple toggle switch to turn them on/off. The switch would cut in/out a voltage divider circuit that acts as your throttle that when off is at the low throttle voltage for your controller (0-1V) and when on it’s at the high throttle (4-5V) and provides that constant speed. Could go fancy with a latching circuit that when you power down it defaults to the low position for then next time you “power up” and a push button could turn them on/off. Clearly it all depends on what your controller needs to see at power up and then find a user experience that makes sense.