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2026. 7. 17. 작업

난이도 & 준비물

증상

I'll apologize in advance for a fuzzy question. My problem consists of two parts. For starters, I'm trying to buy a DC engine for learning purposes and most of them only specifies the watt (which I can use in order to convert and get the horse power that I'm normally used to) or torque. And secondly, I've never built something like this before, usually I build bikes or cars. Normally engines are pre-designed to haul a car or two but when it comes to DC engines I could accidentally buy something that's meant to drive a overhead crane. What torque would be required to match your run-of-the-mill

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This is a great vehicle dynamics question that essentially has two parts to it: Is the motor able to hit top speed, 120 mph? Is the torque enough to accelerate it to top speed within 5 seconds? The motor in question Power : 1000 W (~ 1.36 hp) Speed : 3200 RPM Torque : 1.91 Nm Something interesting to note here is the apparent discrepancy between the three quantities. Since the three quantities are related, one could back-calculate how much power is delivered by the quoted torque at 3200 RPM: Power = Torque x Angular Speed = 1.91 Nm x ( 2π / 60 x 3200 RPM ) 1/s = 640 W So clearly, something is up with the manufacturer's claimed figures . For 1000 W output at 3200 RPM, the required torque should be around 3 Nm, not 1.91 Nm. However, errare humanum est , so we'll stick with the generous 1000 W for the rest of this answer. So what does 1000 W buy? In short, not much. The aerodynamic drag force alone, in the absence of other parasitic factors such as rolling resistance, inclinations and hea