Greg Z
What size DC motor and controller should I use to power a small car (simmular to a Little Tikes Car) with a 200lb person in it? Please include all specs of the motor. Thanks.
try to keep it cheap
Answer
The power can be determined for several situations:
How fast to go when cruising, and the friction and wind load under this condition.
Maximum acceleration with weight of completely loaded vehicle.
Maximum climb rate with weight of vehicle.
If it is just walking pace and no grades and minimal acceleration, I would say 200W. The motor size will dictate battery size too. It will need gears to match the motor speed to the wheel RPM. If you intend to run with this size motor and a 12V battery it needs to be a large 12V x 60-100AH battery to work well, though that will run for quite a few hours. A bigger motor is better with a 24V battery, and more as it gets bigger still.
Usually these things are determined empirically - experience with other similar vehicles determines what is satisfactory. It is best to look at similar ride on cars. Some kids cars may be more like 50W with a small battery but that doesn't work for long or well.
Consider electric disability/mobility scooters. These are only expected to run on flat hard surfaces, an the sizes mentioned above are something like the top end of these. I expect golf scooters are more powerful as they are intended to run on grass with grades. The third link shows an electric wheelchair for tough conditions with almost 1KW of motor power.
Motors will be specified for RPM and mechanical power in watts (the torque can be calculated from that. They are also specified for voltage to provide this RPM and maximum allowable current. Other important considerations are the cooling (if it has a fan it may not be able to run slowly without overheating), the gears built in or how to mount gears, bearing life, waterproof. Mobility and other scooters mentioned are often available second hand, and would be a good source of all the parts you need. You also need a speed controller and a battery charger to suit, and probably wheels and steering., axles etc.
The links below might give some ideas.
The power can be determined for several situations:
How fast to go when cruising, and the friction and wind load under this condition.
Maximum acceleration with weight of completely loaded vehicle.
Maximum climb rate with weight of vehicle.
If it is just walking pace and no grades and minimal acceleration, I would say 200W. The motor size will dictate battery size too. It will need gears to match the motor speed to the wheel RPM. If you intend to run with this size motor and a 12V battery it needs to be a large 12V x 60-100AH battery to work well, though that will run for quite a few hours. A bigger motor is better with a 24V battery, and more as it gets bigger still.
Usually these things are determined empirically - experience with other similar vehicles determines what is satisfactory. It is best to look at similar ride on cars. Some kids cars may be more like 50W with a small battery but that doesn't work for long or well.
Consider electric disability/mobility scooters. These are only expected to run on flat hard surfaces, an the sizes mentioned above are something like the top end of these. I expect golf scooters are more powerful as they are intended to run on grass with grades. The third link shows an electric wheelchair for tough conditions with almost 1KW of motor power.
Motors will be specified for RPM and mechanical power in watts (the torque can be calculated from that. They are also specified for voltage to provide this RPM and maximum allowable current. Other important considerations are the cooling (if it has a fan it may not be able to run slowly without overheating), the gears built in or how to mount gears, bearing life, waterproof. Mobility and other scooters mentioned are often available second hand, and would be a good source of all the parts you need. You also need a speed controller and a battery charger to suit, and probably wheels and steering., axles etc.
The links below might give some ideas.
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Title Post: DC Motor size for a project?
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Rating: 92% based on 925 ratings. 4 user reviews.
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