# Electric Bikes - How can this motor have such a broad voltage spread?

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.

pengyou
01-02-08, 12:59 AM
http://www.transmag.com/3-in-brushless-motor.htm

It states that it can provide from 0.2 hp to 1.0 hp (that part I can easily see) but it also says it can handle from 24 volts to 240 volts. Is this realistic? The size and weight is perfect for what I want to do. I am going to pick up a folding bicycle soon. I am hoping to find a motor that will use 36 volts - Dewalt set - at about 400-500 watts. If you stay in the low to middle range of operations is this likely to be a durable motor?

sherpa93
01-02-08, 06:38 AM
I not familiar with this motor. As a general rule Brushless motors are not voltage sensitive. The windings (turns) determine the rpm per volt (rpm/v). More volts = more rpm. Wire diameter determine the current (amps) it will take before it disintegrates :eek: What you need to look for is stated rpm/v of the motor. Use the rpm/v to determine the speed at a given voltage 24/36/48. Does the speed agree with your gearing, voltage? Larger diameter motors usually mean more torque...

StephenH
01-02-08, 10:45 AM
You really need to know the performance at that voltage. Just saying it can be used at 36v doesn't mean it will produce anywhere near rated power at 36v.

bikingbrit
01-02-08, 11:11 AM
http://www.transmag.com/3-in-brushless-motor.htm

It states that it can provide from 0.2 hp to 1.0 hp (that part I can easily see) but it also says it can handle from 24 volts to 240 volts. Is this realistic? The size and weight is perfect for what I want to do. I am going to pick up a folding bicycle soon. I am hoping to find a motor that will use 36 volts - Dewalt set - at about 400-500 watts. If you stay in the low to middle range of operations is this likely to be a durable motor?

I think they are stating the voltage, rpm, and power ranges available in that case size motor. The 24 volt version undoubtedly has fewer/thicker turns of wire than the 240 volt.