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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.
What are the different types of batteries used in Electric Cars?
mark m
lead-acid batteries for an electric car cost about $3,000, have a range of 75 miles, and a charging life of 500 cycles.
what are some other battery types? costs? range? and cycles? that can be used for Electric Cars?
Answer
The 4 most popular are
1) Nickel family Ni-cad and NIMH
2) Lead Acid
3) Lithium Ion
4) Sodium Nickel Chloride
These are all deep cycle meaning they are designed to be discharged deeper than a normal car battery.
Lead acid are found in gulf carts for example.
Lithium Ion will probably get the most use because they hold a pretty long charge.
The 4 most popular are
1) Nickel family Ni-cad and NIMH
2) Lead Acid
3) Lithium Ion
4) Sodium Nickel Chloride
These are all deep cycle meaning they are designed to be discharged deeper than a normal car battery.
Lead acid are found in gulf carts for example.
Lithium Ion will probably get the most use because they hold a pretty long charge.
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Title Post: Electric Car Range: How is it affected by the Electric Motor wattage?
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Rating: 92% based on 925 ratings. 4 user reviews.
Author: Unknown
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