How is induced torque calculated?
Torque of a three phase induction motor is proportional to flux per stator pole, rotor current and the power factor of the rotor. T ∝ ɸ I2 cosɸ2 OR T = k ɸ I2 cosɸ2 .
How do you calculate max torque rpm?
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.
What is induced torque?
The developed Torque or Induced Torque Equation in a machine is defined as the Torque generated by the electric to mechanical power conversion. The torque is also known as Electromagnetic Torque.
How do you calculate torque from kW and rpm?
kW = 0.105 x Nm x rpm / 1000. Example: A three-phase induction motor can provide 144Nm at 1480 rpm.
How is torque calculated in an induction motor?
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 the equation for the induced torque in an AC machine?
Tind = KHRBSSinα in the anticlockwise direction. In the equation, the K is the constant its value relies on the assembly of the machine. Direction and the magnitude of the induced torque can be written as.
How do you calculate maximum torque of an induction motor?
So, when slip s = R2 / X2, the torque will be maximum and this slip is called maximum slip Sm and it is defined as the ratio of rotor resistance to that of rotor reactance. NOTE: At starting S = 1, so the maximum starting torque occur when rotor resistance is equal to rotor reactance.
How do you calculate induction motor speed?
To calculate RPM for an AC induction motor, you multiply the frequency in Hertz (Hz) by 60 — for the number of seconds in a minute — by two for the negative and positive pulses in a cycle. You then divide by the number of poles the motor has: (Hz x 60 x 2) / number of poles = no-load RPM.
What is the equation for the induced torque in AC machine?
What is induced torque in an electric motor?
This torque is known as the induced torque in the motor. The above-given equation of torque can also be defined in the shape of slip and power air gap losses. This equation is particularly very valuable as It explains the induced torque (t ind) in form of air-gap power (P AG) and synchronous speed (W sync ), which does not fluctuate.
How do you find the maximum torque of a motor?
The equation of torque is The torque will be maximum when slip s = R 2 / X 2 Substituting the value of this slip in above equation we get the maximum value of torque as, In order to increase the starting torque, extra resistance should be added to the rotor circuit at start and cut out gradually as motor speeds up.
What is the relation between torque and rpm in DC motors?
For permanet magnet DC motors, there is a linear relationship between torque and rpm for a given voltage. The maximum torque occurs at 0 rpm, and is called stall torque. The minimum torque (zero) occurs at maximum rpm, reached when the motor is not under a load, and is thus called free rpm. The formula for torque at any given rpm is:
How do you calculate the power of an induction motor?
Power Equation of Induction Motor If we study per phase equivalent circuit of induction motor, then we can use it to find the torque and power calculations to understand the operation of motor. The value of input current (I) to a phase (ø) of the motor can be created by divides the input voltage (V) entire equal impedance (Z). I1 = V ø /Z eq