relation between torque and load ......

torque to accelerate a load, physics

hi guys

i want to know the relation between torque and load

actually i want to find out which motor is best suited to me

the torques of motors are mentioned so how do i know what torque motor is required to carry a certain load (for e.g. for the main drive of a vehicle of abt 2kg how much torque is reqd)???

relation between torque and gear ratio

Typically:

Power = Torque * angular velocity.

moreover:

Torque = radius (cross prroduct with) Force

For a certain load, chosing torque concerns with wheel radius. Also, you must review your velocity and power consumption specifications.

A good staring point:
.
What is the friction load Ff? (Force required to barely get the vehicle moving).
Ts = (Ff X Wheel Radius)
. Ts is the torque require to just barely get the vehicle moving.
.
What is the required vehicle acceleration?
F = mA
Ta = mA X Wheel radius (Torque req'd to accelerate the vehicle)
.
.Total torque req'd Tt = Ts + Ta.
.
The torque available at the drive wheel is equal to the motor torque times the gear ratio from the motor to the wheel (Inverse of the speed ratio).
.
Motor torque varies with speed in a manner that is dependent on the motor type, so the available acceleration also varies with speed.
.
Maximum acceleration is obtained when the Motor J equals the equivalent reflected Load J, where J is the polar moment of inertia. J is part of the motor specification. Equivalent Load J = mR^2, where:
.
m is the load (vehicle) mass
r is the wheel radius