The maximum torque is directly proportional to square of rotor induced emf at the standstill. The maximum torque is inversely proportional to rotor reactance. The maximum torque is independent of rotor resistance.
What is maximum torque in induction motor?
Hence, the developed torque is maximum when the rotor resistance per phase is equal to the rotor reactance per phase under running conditions. By putting the value of sX20 = R2 in equation (1) we get the equation for maximum torque.
What is torque in induction motor?
Torque is the turning force through a radius – with the units Nm in the SI-system and the units lb ft in the imperial system. The torque developed by an asynchronous induction motor varies when the motor accelerates from zero to maximum operating speed.
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.
How do you calculate maximum torque of a motor?
Calculate torque (T) using the formula T = 5,252 x horsepower/rpm. The results are measured in pound-feet. For example, if you have a 40-horsepower motor designed to operate at a peak of 1,200 rpm, the formula would be T = (5,252 x 40)/1200 = 175.07 lb. -feet.
How is rated torque calculated?
- Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
- Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
- Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
- Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.
How do you calculate pull torque?
The maximum torque or pull-out torque, which occurs at the slip s=spo. Once a machine has reached rated operating point, this is the maximum torque that can be applied without stalling the machine (pulling out).
What is motor torque formula?
These equations are for estimation only, friction, windage, and other factors are not taken into consideration. Calculator-1. Known variables: Horse Power and Speed in RPM. Torque is the action of a force producing or tending to produce rotation. Torque = force x distance.
What is the torque of a motor?
The driving force of an electric motor is torque – not horsepower. The torque is the twisting force that makes the motor running and the torque is active from 0% to 100% operating speed.
Why the starting torque of induction motor is low?
So starting torque is low in induction motors. To get maximum starting torque, resistance is added to the rotor while starting slip ring motors, which is reduced gradually as motor picks up the speed. … So starting torque is low in induction motors.
Does more torque mean faster acceleration?
A car with more hp than torque will always be quicker since this gives a car acceleration and speed. … This is why low-end torque becomes important for better acceleration in many scenarios. Higher torque doesn’t mean one vehicle will necessarily be faster than another, though.
Can a car have too much torque?
You see, more torque does not always make a car faster. Once you exceed the traction capabilities of the tires they go up in smoke and the car doesn’t go anywhere. This is why dragsters have slipper clutches, the slipper clutch reduces torque to the maximum amount the tire can handle.
Is the higher the torque the better?
Horsepower means your car can go faster, and torque means…? Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. … Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.
Which is better torque at low rpm or torque at high rpm?
Running at lower RPMs equates to higher torque and thus lower horsepower, while making higher RPM power outputs less torque and higher top horsepower.
How is RPM related to torque?
Mathematically, horsepower equals torque multiplied by rpm. H = T x rpm/5252, where H is horsepower, T is pound-feet, rpm is how fast the engine is spinning, and 5252 is a constant that makes the units jibe. So, to make more power an engine needs to generate more torque, operate at higher rpm, or both.
What is better to have torque or horsepower?
Both horsepower and torque can affect the speed of a vehicle. Torque can help a vehicle accelerate to a higher speed quickly, whereas horsepower can help a vehicle improve its top speed.