I'd like to build an electric scooter for persons with mobility issues to assist them to traverse the soft white sand to access the beaches, ocean, get their feet wet :O)
The vehicle must be able to cut the sand AND climb the ADA ramps incline (nominally at 1in rise per 1ft run)
I'm thinking 18" dia, 8" wide rear tires to cut the sand. Maybe all we need is 15" !?!
MAX speed is 6mph (speed is not a factor here)
Passenger weight is 220lb with cargo weight of <= 30lb
I'm thinking torque over speed.
My question is, is what size motor/controller do I need to use in this build? And can I be supplied with same?
For this build a 36 Volt 650 Watt gear motor and 36 Volt 800 or 1000 Watt controller will provide plenty of power and torque to do the job. We have these parts available and in stock. Here are links to the pages they are sold on:
We also have an online gear ratio calculator that can be used to figure out what size chain sprockets are needed to achieve the 6 mph top speed that you want the scooter have. Here is a link to it:
Hopefully this information will help to point you in the right direction. Please let me know if you have any further questions.
Thank you very much for your response.
#1 - I did your calculator thing and am not sure what it is telling me!?!
Like, don't need no old people doing 22mph down the handicap ramp!
See FIGURE 1
So, I reduced the RPM and increased the wheel sprocket which increased the gear ratio and got closer to the 6mph which is cool.
I do NOT need people drag racing these puppies :O)
See FIGURE 2
So, first, I don't know what sprocket-teeth are available!?! So I'll need your advice on that.
#2 - So, I'm looking at speed controller Item # SPD-36800B and motor Item # MOT-MX650 based on your advice. Cool.
Now, me like knowing duh, can you make a list of ALL what I need ELECTRICAL (and brakes, chains, sprockets) to get this puppy moving?
Keeping in mind that the majority of my clients will be like old, like me, and all they know is to turn the key on and go. Nothing too much more complicated then that. :O)
I really don't want REVERSE on this but thinking, some of these people will drive into a wall and may need the reverse, so, if that is possible!?! :O\
#3 - I can then review the list, do up some schematics, then purchase the stuff, and see what happens? Is that okay?
#4 - If successful with this design, it won't be the last one built! (SurfCity already commissioned me for a couple for their beach front).
I appreciate you working with me on this and will always remember that you helped me.
Again, thank you so much for getting back with me!
These type of electric motors need to be run near their top RPM in order to run cool and produce enough power, so I recommend using a gear motor instead of a standard motor that does not have gear reduction. I ran some calculation with our 24 Volt 450 Watt gear motor that has a 550 rpm top output speed (MOT-24450G) and got perfect results for your project. Here is the gear ratio calculation.
This calculation was made using a 44 tooth bicycle chain sprocket for the drive wheel which we sell (SPR-B44). The 24V 450W gear motor has a 9 tooth bicycle chain sprocket on it. Both of these sprockets use standard 1/2" x 1/8" bicycle chain which we sell. We have a 24V 500W speed controller with reverse that can be used with this motor.
I can make a kit for this project in which all of the parts will have matching and labeled connectors on them that are ready to plug together when the kit arrives. Here is a link to a kit I made for another customer which has all of the parts I recommend for your project minus the 1/2" x 1/8" chain and 44 tooth wheel sprocket: https://cart.electricscooterparts.com/ProductDetails.asp?ProductCode=KIT-140
The 450 Watt motor with 6 mph top speed will have a lot of torque for going through sand and climbing ramps. I am not sure how much ride time you need the cart to have. The larger the batteries are the more ride time the cart will have. The KIT-140 that I linked to above has two 12V 12Ah batteries which will provide around 45 minutes of ride time (4 miles) at full speed. If you need a longer ride time then I could make a kit with larger batteries, or I could make a kit with smaller batteries for a shorter ride time.
If this gear ratio and electrical setup sounds good to you then I can go ahead and make a kit. I would just need to know how much run time you need the cart to have?
For a 1-2 mile ride time 10Ah batteries should have plenty of capacity so I made a kit including them. Here is a link to the kit: http://cart.electricscooterparts.com/ProductDetails.asp?ProductCode=KIT-144
I included a half twist throttle with the kit because it is one of the easiest ones we have to operate. It has a battery power meter and push button switch on it that will turn the power on and off. I included a second handlebar mounted push button switch for reverse. If you prefer a different throttle or any other different parts with the kit I can make those changes. Please let me know if you have any questions, or if you would like any changes made to the kit.
continue to do business.
I have a solution. We have a machine shop that modifies a 44 tooth bicycle chain sprocket and makes a 3/4" hub sprocket adapter and bolts them together. This is a custom made part and it t takes the machine shop a few days to make it after the order is placed. Here is a link to purchase the part: http://cart.electricscooterparts.com/ProductDetails.asp?ProductCode=SPR-B-1-44T
The electrical system is the easy part and the drive train is often where is gets complicated. I did not realize that the axle was fixed and it was single wheel drive. If using go kart wheels sometimes the easiest way is to bolt or weld the bicycle sprocket directly onto a go kart sprocket that is smaller than it.