Starting torque is the maximum torque that can be produced by a motor in order to start rotational movement of the load. Stall torque is the maximum torque that can be applied to the shaft and cause the motor to stop rotating. When there is no rotation in the motor, the wound coils are acting as a fixed resistance.
What is the starting torque of an induction motor?
Starting torque. The standard cage induction motor is designed to produce a starting torque over the range between standstill and that at which pull-out (minimum) torque occurs, which is not less than 1.3 times a torque characteristic which varies as the product of the square of the unit speed and the rated torque.
What are the difference between starting torque and running torque?
Answers and Replies
Starting torque = torque reqd to overcome friction, load inertia, stiction, etc., and accelerate the load inertia. This is meant to be a transient value. Running torque or load torque = less than starting torque, keeps the previously accelerated inertia + load at steady state speed.
How do you calculate initial torque?
To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.
What is torque in electric motor?
Torque is a rotating force produced by a motor’s crankshaft. The more torque the motor produces, the greater is its ability to perform work. Since torque is a vector acting in a direction it is commonly quantified by the units Nm or pound-feet.
Is high starting torque good or bad?
A motor’s efficiency is a very important key in its starting torque. … Gear, vane, and geroler motors typically have the worst starting torque due to their poor efficiencies at low speeds. A piston motor has great efficiencies in both low and high-speed applications and typically has the best starting torque.
What is the maximum torque?
Torque is defined as τ = rF sin θ, where F is the force, r is the distance from the pivot that the force is applied, and θ is the angle between r and F. … (b) The maximum torque occurs when θ is a right angle and sin θ = 1. (c) Zero (minimum) torque occurs when θ is zero and sin θ = 0.
What is pull in torque?
Definition of pull-in torque
: the maximum constant torque under which a motor will accelerate from rest to approximate normal speed.
What is initial torque?
This specifies the torque that the frictional surfaces of a friction clutch or brake generate before they are broken in.
How do you calculate torque from HP and RPM?
When you choose torque, this calculator will measure the approximate torque of an engine based on the horsepower, multiplied by 5,252 (conversion between foot-pounds and horsepower), divided by the RPM of the engine. For example, if your engine has 350 horsepower then the torque would be 367 foot-pounds, at 5,000 RPM.
How is motor torque calculated?
A relatively simple method to estimate electrical motor torque is to measure its electrical power input, the voltage and the current in the power line driving the motor. For most motors, torque is directly proportional to the current and can be derived from it by knowing shaft speed and motor efficiency.
How much torque does a 1 hp motor have?
The 1800 RPM, 1HP motor produces 3 ft. lbs of torque at 1800 RPM. The 3600 RPM, 1HP motor produces 1.5 ft. lbs.