Difference between revisions of "PowerWheels 2014 Drivetrain Ideas"
From MakeICT Wiki
Jump to navigationJump to search (Created page with "= Brushless DC Motor = == Washing machine == == RC == * Repurpose outrunner brushless DC hobbyist motor for car/boat * [http://www.instructables.com/id/The-New-and-Improved-Br...") |
|||
| Line 1: | Line 1: | ||
= Brushless DC Motor = | = Brushless DC Motor = | ||
| − | |||
== RC == | == RC == | ||
* Repurpose outrunner brushless DC hobbyist motor for car/boat | * Repurpose outrunner brushless DC hobbyist motor for car/boat | ||
* [http://www.instructables.com/id/The-New-and-Improved-Brushless-Electric-Scooter-Po/ Overview of this technique for scooters] | * [http://www.instructables.com/id/The-New-and-Improved-Brushless-Electric-Scooter-Po/ Overview of this technique for scooters] | ||
| + | * Requires motor (2 motors?) and motor controller | ||
| + | * [http://www.hobbyking.com/ One recommended part supplier] | ||
=== Advantages === | === Advantages === | ||
* Definitely the best weight/performance/efficiency ratio | * Definitely the best weight/performance/efficiency ratio | ||
| Line 9: | Line 10: | ||
* Not as straightforward electrically | * Not as straightforward electrically | ||
* Overkill? | * Overkill? | ||
| − | * More expensive than hacky solutions ($200ish) | + | * More expensive than hacky solutions ($200ish) (However people in town may have parts for us?) |
* Less known about how to do this | * Less known about how to do this | ||
| − | * Tend to be fast RPMs | + | * Tend to be fast RPMs so big amount of gearing down |
| + | == Washing machine == | ||
| + | This is the same idea as the RC motor except that we repurpose a washing machine motor instead | ||
| + | === Advantages === | ||
| + | * These motors and big and cool looking. We will look totally rad | ||
| + | * Unique, innovative | ||
| + | === Disadvantages === | ||
| + | * What voltage do these run on? Likely we will need to rewind coils? | ||
| + | * Motor controller probably won't work out-of-the-box. We have to make our own or hope for the best for a commercial unit? | ||
= Hydrostat = | = Hydrostat = | ||
* Use 12V pump from Harbor Freight ($30ish each) to pump oil to turbine | * Use 12V pump from Harbor Freight ($30ish each) to pump oil to turbine | ||
| Line 30: | Line 39: | ||
* Not much reference in using vane pumps in general as turbines. Does this mean it's a bad idea? | * Not much reference in using vane pumps in general as turbines. Does this mean it's a bad idea? | ||
== Tesla Turbine == | == Tesla Turbine == | ||
| − | = Wheelchair = | + | |
| − | = Scooter = | + | = Wheelchair System = |
| + | * Use 2 motors from one of the 3 wheelchairs we already have. | ||
| + | * Use the intended motor controller for the wheelchair | ||
| + | * Re-gear the motor for more speed and less torque | ||
| + | == Advantages == | ||
| + | * Might be the easiest/cheapest way to go, since we already have motors and a motor controller | ||
| + | == Disadvantages == | ||
| + | * These motors are built for battery efficiency over hours and not for speed. Are they strong enough? Will they be fast? | ||
| + | = Traditional Scooter Motors = | ||
| + | * Use a couple of traditional permanent-magnet scooter motors | ||
| + | == Advantages == | ||
| + | * This is the standard solution by other teams. It's tried, tested, and works | ||
| + | == Disadvantages == | ||
| + | * Doesn't really take advantage of the parts we happen to have on-hand | ||
| + | * Not as fun a solution as others? | ||
| + | == Bicycle Components == | ||
| + | With any of the above solutions, we may need to gear down-up. Bicycle components may be a way to do this | ||
| + | * Use crank/sprocket/derailleur with bicycle wheel to get the right gearing | ||
| + | * With wheelchair motors we could attach large gear from crank to motor shaft. There are good ideas on Instructables about how to do this. | ||
| + | * Scooter motor distributors sell small gears that fit on motor shafts which are compatible with bicycle chains. | ||
| + | == Advantages == | ||
| + | * Takes advantage of parts that we probably already have around. A super cheap way to go | ||
| + | * Easily change gear ratios so we can find the best combination without knowing what we are doing. :-) | ||
| + | == Disadvantages == | ||
| + | * Thin tires. Could this cause traction problems? | ||
| + | * With wheelchair we would be gearing down then gearing up. Not very efficient? | ||
| + | * Slightly less efficient than a direct-drive solution | ||
Revision as of 07:54, 23 May 2014
Brushless DC Motor
RC
- Repurpose outrunner brushless DC hobbyist motor for car/boat
- Overview of this technique for scooters
- Requires motor (2 motors?) and motor controller
- One recommended part supplier
Advantages
- Definitely the best weight/performance/efficiency ratio
Disadvantages
- Not as straightforward electrically
- Overkill?
- More expensive than hacky solutions ($200ish) (However people in town may have parts for us?)
- Less known about how to do this
- Tend to be fast RPMs so big amount of gearing down
Washing machine
This is the same idea as the RC motor except that we repurpose a washing machine motor instead
Advantages
- These motors and big and cool looking. We will look totally rad
- Unique, innovative
Disadvantages
- What voltage do these run on? Likely we will need to rewind coils?
- Motor controller probably won't work out-of-the-box. We have to make our own or hope for the best for a commercial unit?
Hydrostat
- Use 12V pump from Harbor Freight ($30ish each) to pump oil to turbine
Power Steering Pump as Turbine
- Needs to be vane pump. Most but not all PS pumps are vane. Disassembly Video
- Pumps available from salvage years for $20ish. Some are pick/pull and some are not. Price is the same
- Vanes in PS pump fly out from centrifugal force.
- Must use lubricating liquid
Advantages
- Innovative/unique
- Could be cool to use transparent pipes plumbed all over the place so people can see the hydraulic action. Put glittery stuff inside the fluid
- CVT Transmission!
Disadvantages
- Getting the balance between pressure and displacement of liquid likely to be tricky
- Extra weight/parts that are totally unnecessary
- Efficiency? Likely low
- Only 1 example found of using a PS pump as a turbine (MIT project) and that example was a report and not explained in detail.
- Not much reference in using vane pumps in general as turbines. Does this mean it's a bad idea?
Tesla Turbine
Wheelchair System
- Use 2 motors from one of the 3 wheelchairs we already have.
- Use the intended motor controller for the wheelchair
- Re-gear the motor for more speed and less torque
Advantages
- Might be the easiest/cheapest way to go, since we already have motors and a motor controller
Disadvantages
- These motors are built for battery efficiency over hours and not for speed. Are they strong enough? Will they be fast?
Traditional Scooter Motors
- Use a couple of traditional permanent-magnet scooter motors
Advantages
- This is the standard solution by other teams. It's tried, tested, and works
Disadvantages
- Doesn't really take advantage of the parts we happen to have on-hand
- Not as fun a solution as others?
Bicycle Components
With any of the above solutions, we may need to gear down-up. Bicycle components may be a way to do this
- Use crank/sprocket/derailleur with bicycle wheel to get the right gearing
- With wheelchair motors we could attach large gear from crank to motor shaft. There are good ideas on Instructables about how to do this.
- Scooter motor distributors sell small gears that fit on motor shafts which are compatible with bicycle chains.
Advantages
- Takes advantage of parts that we probably already have around. A super cheap way to go
- Easily change gear ratios so we can find the best combination without knowing what we are doing. :-)
Disadvantages
- Thin tires. Could this cause traction problems?
- With wheelchair we would be gearing down then gearing up. Not very efficient?
- Slightly less efficient than a direct-drive solution
