Difference between revisions of "PowerWheels 2014 Drivetrain Ideas"
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= Brushless DC Motor = | = Brushless DC Motor = | ||
| + | == Stuff To Know == | ||
| + | * Total power consumption must be 1440 Watts or less: | ||
| + | ** 36v = 40A Fuse (Digikey #F3089-ND) | ||
| + | ** 28.8v = 50A Fuse (Digikey #F3090-ND) | ||
| + | ** 24v = 60A Fuse (Digikey #F3091-ND) | ||
| + | ** 12v = 125A Fuse (Digikey #F1879-ND) | ||
| + | * Motor Controller is required. | ||
| + | * Size limit: 62” long x 36” wide x 72" high (including driver). | ||
| + | ** Seat height may not be lower than the axle height. | ||
== RC == | == RC == | ||
* Repurpose outrunner brushless DC hobbyist motor for car/boat | * Repurpose outrunner brushless DC hobbyist motor for car/boat | ||
| Line 13: | Line 22: | ||
* Less known about how to do this | * Less known about how to do this | ||
* Tend to be fast RPMs so big amount of gearing down | * Tend to be fast RPMs so big amount of gearing down | ||
| + | |||
== Washing machine == | == Washing machine == | ||
This is the same idea as the RC motor except that we repurpose a washing machine motor instead | This is the same idea as the RC motor except that we repurpose a washing machine motor instead | ||
| Line 24: | Line 34: | ||
= 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 | ||
| + | |||
== Power Steering Pump as Turbine == | == Power Steering Pump as Turbine == | ||
* Needs to be vane pump. Most but not all PS pumps are vane. [https://www.youtube.com/watch?v=G0e7MlIPZt4 Disassembly Video] | * Needs to be vane pump. Most but not all PS pumps are vane. [https://www.youtube.com/watch?v=G0e7MlIPZt4 Disassembly Video] | ||
| − | * Pumps available from salvage years for $20ish. Some are pick/pull and some are not. | + | * Pumps available from salvage years for $20ish. Some (Don Schmid: $22) are pick/pull and some (A-plus: $20ish) are not. |
* Vanes in PS pump fly out from centrifugal force. | * Vanes in PS pump fly out from centrifugal force. | ||
* Must use lubricating liquid | * Must use lubricating liquid | ||
| Line 39: | Line 50: | ||
* Only [http://www.technologyreview.com/news/406114/how-to-build-a-solar-generator/ 1 example] found of using a PS pump as a turbine (MIT project) and that example was a report and not explained in detail. | * Only [http://www.technologyreview.com/news/406114/how-to-build-a-solar-generator/ 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? | * Not much reference in using vane pumps in general as turbines. Does this mean it's a bad idea? | ||
| + | |||
== Tesla Turbine == | == Tesla Turbine == | ||
=== Advantages === | === Advantages === | ||
| Line 53: | Line 65: | ||
== Disadvantages == | == Disadvantages == | ||
* These motors are built for battery efficiency over hours and not for speed. Are they strong enough? Will they be fast? | * These motors are built for battery efficiency over hours and not for speed. Are they strong enough? Will they be fast? | ||
| + | |||
= Traditional Scooter Motors = | = Traditional Scooter Motors = | ||
* Use a couple of traditional permanent-magnet scooter motors | * Use a couple of traditional permanent-magnet scooter motors | ||
== Advantages == | == Advantages == | ||
* This is the standard solution used by most other teams. It's tried, tested, and works. If we want to be absolutely sure that we won't be laughed off the track, this is safe. | * This is the standard solution used by most other teams. It's tried, tested, and works. If we want to be absolutely sure that we won't be laughed off the track, this is safe. | ||
| − | |||
== Disadvantages == | == Disadvantages == | ||
* Doesn't really take advantage of the parts we happen to have on-hand | * Doesn't really take advantage of the parts we happen to have on-hand | ||
* Not as fun a solution as others? | * Not as fun a solution as others? | ||
| − | + | ||
| + | = Bicycle Components = | ||
With any of the above solutions, we will likely need to gear down or gear up. Bicycle components may be a way to do this | With any of the above solutions, we will likely need to gear down or gear up. Bicycle components may be a way to do this | ||
* Use crank/sprocket/derailleur with bicycle wheel to get the right gearing | * 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. | * 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. | * Scooter motor distributors sell small gears that fit on motor shafts which are compatible with bicycle chains. | ||
| − | |||
== Advantages == | == Advantages == | ||
* Takes advantage of parts that we probably already have around. A super cheap way to go | * 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. :-) | * Easily change gear ratios so we can find the best combination without knowing what we are doing. :-) | ||
| + | * Bicycle repair workshop on Sat might be a way to fuel this idea further and get parts | ||
== Disadvantages == | == Disadvantages == | ||
* Thin tires. Could this cause traction problems? | * Thin tires. Could this cause traction problems? | ||
* With wheelchair we would be gearing down then gearing up. Not very efficient? | * With wheelchair we would be gearing down then gearing up. Not very efficient? | ||
* Slightly less efficient than a direct-drive solution | * Slightly less efficient than a direct-drive solution | ||
Latest revision as of 16:20, 23 May 2014
Contents
Brushless DC Motor
Stuff To Know
- Total power consumption must be 1440 Watts or less:
- 36v = 40A Fuse (Digikey #F3089-ND)
- 28.8v = 50A Fuse (Digikey #F3090-ND)
- 24v = 60A Fuse (Digikey #F3091-ND)
- 12v = 125A Fuse (Digikey #F1879-ND)
- Motor Controller is required.
- Size limit: 62” long x 36” wide x 72" high (including driver).
- Seat height may not be lower than the axle height.
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 might not work out-of-the-box. (What do we do, set for "spin cycle?") 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 (Don Schmid: $22) are pick/pull and some (A-plus: $20ish) are not.
- 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
Advantages
- Seems cool/innovative
Disadvantages
- Make our own?
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 used by most other teams. It's tried, tested, and works. If we want to be absolutely sure that we won't be laughed off the track, this is safe.
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 will likely need to gear down or gear 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. :-)
- Bicycle repair workshop on Sat might be a way to fuel this idea further and get parts
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
