dammit JWINYAP(Just What I Need Yet Another Project)

floydR

Well-known member
Joined
Aug 23, 2017
Messages
1,157
Very much in the planning stage.
Thanks ynot, MFB Dan, cak Just what I need. :)
My parents have a dead lawn tractor craftsman LT2000, This model has a belt driven hydrostatic transmission so with a electric motor that is short enough to fit between the input shaft and the seat would work probably would work with along one too i believe that there is enough room between the transmission and seat firewall. have to pull the body of the tractor and see. This option could work for a large tread mill motor. Will have to remove the tractor body to see if what I think will work will actually work.
Many treadmill motors are rated for 90v-130v dc. although I have read they work at lower voltages. I am not comfortable working with high voltage systems (48v)51.8v nominal is about as high as I want to go. So if I were to parallel boost converters susceptibility as https://www.ebay.com/itm/143731395097 or https://www.ebay.com/itm/402823088655? would that let out the magic smoke from the boost converters . I could get the voltage but in order to get the amps needed I would need to parallel several of the converters. Although I could just go with a new motor from https://www.goldenmotor.com/ and motor controller.
Later floyd
 

italianuser

Active member
Joined
Feb 25, 2020
Messages
246
We all know you just needed another project! :) Go for it @floydR, seems good!

P.S.
What exactly is a "dead lawn tractor craftsman LT2000"?? 😅
 

floydR

Well-known member
Joined
Aug 23, 2017
Messages
1,157
riding lawn mower
IMG_20210607_112716526.jpg
later floyd
 

MBF Dan

New member
Joined
May 14, 2021
Messages
17
You should check out this website.
They sell a kit to swap out the entire transaxle assembly and replace it with a new rear axle and and electric motor for a lawnmower. I felt the kit was way to expensive for me. Expecally when I could compare it to far cheaper units on alibaba but I have not had luck importing something which is that big. I went down that road once and importing directly from another country wasn't something I wanted to deal with.
But the kits I have seen use either 1000watt or 500watt motors. I am looking at a 4kw motor to use my case ingersoll garden tractor. Hydraulic systems have high losses due to fluid energy transfer losses.
I really gave the kits on that site a lot of consideration it would require so much less battery capacity to do the job and so much less power to charge. But I use the hydraulics on my case ingersoll for splitting wood and other things so I kind of want to keep the portable hydraulic pump even if it costs me batteries to have the multipurpose machine.
But I really like the design where you use a 48 volts electric rear axle swap and electric motors on the mower deck and snow blower deck. But the kit from that website is about $1500 and doesn't include batteries. That just seems to close to the cost of a new EV mower which does come with batteries for me to order it.
I am in comparison looking at about $500 for a new 48vdc permanent magnet motor at 4kw. Going this road for me with the batteries my budget is $3000 for my finished project but it will be a mini truck 4wd which I can either put a mower deck on or convert another case ingersoll for the cost of the motor and use the same batteries to mow the lawn. Having 3 parts tractors doesn't hurt there...
So there is the dilemma as I see it the best design that requires less power is cost effective if you live in Asia. Oh those axle kits I found online are marketed for the trikes they use in Asia. I suspect they are geared for a much higher speed but I don't know for sure. That was my other concern short of ordering from the website I posted I couldn't see how to know I got something that matched the application.
I will follow your progress though because I do have much the same issue my gas mower is very old and hanging on by a thread. It is a JD from the 90s that has mowed way more ground than the manufacturer ever intended for it. I have probably 2 acres of fast growing grass.
But my thoughts at the moment are simply that I will trade higher power consumption for cost if I can get a multifunctional machine because I am also in the process of installing solar and the lawn mowing happens in the summer when I will have excess solar capacity.
Wow that got long. Hope it was helpful.
 

floydR

Well-known member
Joined
Aug 23, 2017
Messages
1,157
Just remembered I have a 48vDC ryobi lawnmower motor sitting in the closet if not powerfull enough for powering the hydrostatic transaxle it should work for the mower blades. I have two of the motors one is still on a mower. I don't know the wattage of the motors only clues are the most it would be is50 15 amp CB x 48v?= 2400 720w? I think they are much smaller maybe 1000w 720w. the motor is heavy 10 lbs 4.8 Kg I tested the motor last night @ 24v and it ran, then tested with the mower @48v nominal it worked mowing the smallback yard self propelled sorta worked. Then I tested in with hoverboard batteries.
I just tested the one in the mower with two 36v hoverboard batteries connected in series. It works although I bypassed the safety switch unintentionally. The motor seemed to work ok at 72v nominal propably close to 80-82v. But it was a very short test once around the small back yard. The self propelled feature actually works. @58v it was barely working. I need a dc amp clamp meter.
I believe the speed control is a mechanical lever that pull the transmission to the rear tightening the belt drive.
I know this isn't about a tractor but it is sort of an EV, Very limited range EV.
later floyd
misread the CB
 
Last edited:
Top