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Imagine you have an electric car with a specific battery capacity and you want to test the effect of the electric motor to the car's range.
So, assume you have 2 motors: one with A KW and another with 5A KW.
If placed on the car and used to test the range till total battery depletion (assuming same constant velocity) which motor would lead to higher range?
Answer
If the same car is moving at the same speed, it will use the same amount of energy to move it the same distance. (Weight difference between the motors will probably be negligible). The energy different motors use to supply this will vary
Assuming that both motors are rated high enough to maintain the desired speed, the biggest factor affecting range will be motor efficiency. The power rating has little to do with efficiency. It is possible that either the larger or the smaller motor could deliver the better range.
Generally electric motors with lower electrical resistance, better insulation, lower magnetic reluctance and smaller air gaps will have higher efficiencies. Running a motor closer to its voltage limits will mean less power losses. (Power losses=ampxampx resistance)
This link has some typical examples of motor efficiency curves versus output power.(EFF v Wo)
http://www.cyclone-tw.com/dc24.htm
Work out the power range that you car will need, to maintain your desired speed. Then you can then look for the motor with the best efficiency curves to match your needs.(and gearing).
In short it is more a matter of how well the motor is made and how well it matches your needs then what it is rated at. A larger motor will usually run more efficiently at its rated load. If it is running well below that then the smaller motor may well give best results.
The trade off for longer range is usually slower acceleration.
If the same car is moving at the same speed, it will use the same amount of energy to move it the same distance. (Weight difference between the motors will probably be negligible). The energy different motors use to supply this will vary
Assuming that both motors are rated high enough to maintain the desired speed, the biggest factor affecting range will be motor efficiency. The power rating has little to do with efficiency. It is possible that either the larger or the smaller motor could deliver the better range.
Generally electric motors with lower electrical resistance, better insulation, lower magnetic reluctance and smaller air gaps will have higher efficiencies. Running a motor closer to its voltage limits will mean less power losses. (Power losses=ampxampx resistance)
This link has some typical examples of motor efficiency curves versus output power.(EFF v Wo)
http://www.cyclone-tw.com/dc24.htm
Work out the power range that you car will need, to maintain your desired speed. Then you can then look for the motor with the best efficiency curves to match your needs.(and gearing).
In short it is more a matter of how well the motor is made and how well it matches your needs then what it is rated at. A larger motor will usually run more efficiently at its rated load. If it is running well below that then the smaller motor may well give best results.
The trade off for longer range is usually slower acceleration.
Is the Zenn electric car a good choice for the environment?
NinjaNinja
I am researching the Zenn electric car and how it effects the environment for a school project on Climate Change. I need some pros and cons on the car, but the company website for it does not share anything. It would also be great if you would give your own personal thoughts on the Zenn as well. Thanks.
Answer
The Zenn Motor company is a Canadian company that was producing a NEV (neighborhood electric vehicle.) A nev is typically a small, light, often open, electric vehicle similar to what you might see around a golf course, hotels, a campus or a corporation. There has been some push to market them for private use in enclosed communities and due to recent NEV laws use them on roads where the speed limit is less than 35mph.
The Zenn NEV is an enclosed vehicle, but shares with others far less demanding road worthy tests. The Zenn NEV was a vehicle prepared for the later insertion of an Eesu (electrical energy storage unit) made by EEStor a privately held Texas Company. Presumably with the better power source the NEV could be upgraded to a fully road worthy vehicle. Zenn has private sources of information and based upon the information it has received it has bought about a 10% stake in EEStor and has exclusive rights to market the Eesu in 4 wheeled vehicles.
But more recently it has decided to shift its goal from producing vehicles to just preparing a power train based upon the Eesu. This would be marketed to other manufacturers of electric vehicles. And most importantly to your question, this makes any vehicle produced by Zenn Motors an orphan.
Between being a less substantial car with presumably a lower lifetime and a vehicle that is being abandoned by its manufacturer I wonder about it's life expectancy. Our environment has seen other examples of a throw away technology with bottles, cans, plastic bags. Useful life expectancy has a clear impact on how many will have to be produced and how often they will be replaced. In general an electric vehicle with it's few moving parts might be expected to last a very long time. Energy and environmental costs can then be amortized over a longer period. This may be less so with a Nev and a vehicle with less support.
The countering argument is that NEV use is an alternative to using a less environmentally friendly vehicle. If the vehicle is operated at lower speeds and less frequently if may still last a long time and avoid an energy and environmental cost of replacement.
In general, any electric vehicle is going to be operationally better for the environment than using an equally sized ICE (internal combustion engine) vehicle simply because it may be up to 5 times more efficient and produces no operational pollution.
The Zenn Motor company is a Canadian company that was producing a NEV (neighborhood electric vehicle.) A nev is typically a small, light, often open, electric vehicle similar to what you might see around a golf course, hotels, a campus or a corporation. There has been some push to market them for private use in enclosed communities and due to recent NEV laws use them on roads where the speed limit is less than 35mph.
The Zenn NEV is an enclosed vehicle, but shares with others far less demanding road worthy tests. The Zenn NEV was a vehicle prepared for the later insertion of an Eesu (electrical energy storage unit) made by EEStor a privately held Texas Company. Presumably with the better power source the NEV could be upgraded to a fully road worthy vehicle. Zenn has private sources of information and based upon the information it has received it has bought about a 10% stake in EEStor and has exclusive rights to market the Eesu in 4 wheeled vehicles.
But more recently it has decided to shift its goal from producing vehicles to just preparing a power train based upon the Eesu. This would be marketed to other manufacturers of electric vehicles. And most importantly to your question, this makes any vehicle produced by Zenn Motors an orphan.
Between being a less substantial car with presumably a lower lifetime and a vehicle that is being abandoned by its manufacturer I wonder about it's life expectancy. Our environment has seen other examples of a throw away technology with bottles, cans, plastic bags. Useful life expectancy has a clear impact on how many will have to be produced and how often they will be replaced. In general an electric vehicle with it's few moving parts might be expected to last a very long time. Energy and environmental costs can then be amortized over a longer period. This may be less so with a Nev and a vehicle with less support.
The countering argument is that NEV use is an alternative to using a less environmentally friendly vehicle. If the vehicle is operated at lower speeds and less frequently if may still last a long time and avoid an energy and environmental cost of replacement.
In general, any electric vehicle is going to be operationally better for the environment than using an equally sized ICE (internal combustion engine) vehicle simply because it may be up to 5 times more efficient and produces no operational pollution.
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Title Post: Electric Car Range: How is it affected by the Electric Motor wattage?
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