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I am trying to compare the difference in torque for these two motors. According to specs, the first has a 'rated' torque of 1.7N.m. The second smaller motor shows a 'max torque' of 9Nma. Why is there such a huge difference in these numbers? Isn't the first option the more powerful motor? Also, why does the first option show 500w and the Flipysky 4000W. Again, huge difference, right?
As for the application, I have a 160 lb cart that I am needing to control and that's without the driver. I was planning to power using two 6384 motors but I'm concerned that these will not have the torque to carry the load.

500W 48V Scooter Brushless Engine Motor for E-Tricycle Electric Three Wheel Rickshaw
Product Spec:
Rated Output Power: 500W.
Rated Voltage: 36/48/60V DC.
Unload Speed: 3100 RPM.
Rated Speed: 2800 RPM.
Gear Ratio - 1:6.
Rated Current - 17.8/13.4/10.8A.
No Load Current - 4.5/4.0/3.3A.
Rated Torque - 1.7 N.m.
Application - Small and Medium size E-Tricycle.

Flipsky 6384 190KV 4000W BLDC Belt DC Motor
Product Spec:
Max Power: 4000 Watts
Max Current: 95 Amps
Max Volts:3-12s
Max Torque: 9Nm
Motor Resistance: 0.05Ohm
Recommend ESC:VESC4&VESC6(3-13S )
BLDC Motor
The number of pole: 14
 

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Did you mean Engine 2 has max RPM 7000 compared to 6000? In these examples I wouldn't say it mattered because of the better high end torque of Engine 2. In another case such as comparing an engine with low torque, high revving and high torque, low revving. If they have the same power then they will both be as fast as each other just the low revving engine will have a better launch, unless you dump the clutch at very high rpms for the higher revving engine.
 

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Engine is a device that converts heat to work. Steam engine, gasoline/petrol engine, diesel engine, etc.

With electricity, the device that converts electricity to work is a motor.

If you're going to be teaching, use correct terminology.
 

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Selected definitions, from among the several variants on the definition of each word:

engine
  • {Oxford Languages} 1. a machine with moving parts that converts power into motion.
  • {Merriam Webster} 1: a machine for converting any of various forms of energy into mechanical force and motion
  • {Britannica} 1 : a machine that changes energy (such as heat from burning fuel) into mechanical motion
(other common definitions are specific to the conversion of heat energy to mechanical energy, or refer to applications in railway equipment, information technology, etc)

motor
  • {Oxford Languages} a machine, especially one powered by electricity or internal combustion, that supplies motive power for a vehicle or for some other device with moving parts.
  • {Merriam Webster}:
    • 1: one that imparts motion
    • 2: any of various power units that develop energy or impart motion: such as
      • a: a small compact engine
      • b: INTERNAL COMBUSTION ENGINE
        • especially : a gasoline engine
      • c: a rotating machine that transforms electrical energy into mechanical energy
  • {Collins} The motor in a machine, vehicle, or boat is the part that uses electricity or fuel to produce movement, so that the machine, vehicle, or boat can work.
Wikipedia notes: "An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.[1][2]"

So an internal combustion engine can be legitimately referred to as an "engine", or a "motor". Motor was very commonly used for internal combustion gasoline and diesel engines for a century or so, but more recent practice is typically to use "engine". Similarly, an electric (or hydraulic, or pneumatic, or steam) motor can be legitimately referred to as an "engine", or a "motor". "Engine" is often seen as the result of using online translation tools, but more typical practice is to use "motor" for electric machines.


These discussions are easier and more clear if people follow the popular convention of using "engine" for fuel-burning engines and "motor" for devices which convert electricity (or fluid flow) to mechanical shaft power, even though other uses of both words are legitimate. So rather than incorrectly telling people they're wrong, we should encourage the most common use.
 

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They may be legit according to librarians and accountants looking in dictionaries, but in engineering practice and in this forum given an engine comes out and a motor goes in, all you're doing is breeding confusion by not enforcing strict terminology in its vernacular....which you seem to do in your last paragraph after spending a thousand words sowing contrarian confusion. What was the point, Brian?
 
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