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.
What is the formula for maximum torque?
The expression for maximum torque can be obtained by substituting R 2 = s X 2 in the torque equation.
How do you calculate the 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.
What is the maximum torque of 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 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.
What is torque of a 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.
How do you find maximum torque speed?
Ns = 120f/P = 120×50 / 4 = 1500 r.p.m. ns = Ns/60 = 1500/60 = 25 r.p.s. iii) Speed at which maximum torque occurs is speed corresponding to, N = Ns (1 – sm ) = 1500 (1 – 0.1) = 1350 r.p.m.
How do you calculate torque of a 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 formula to calculate torque?
Mathematically, torque can be written as T = F * r * sin(theta), and it has units of Newton-meters. When the sum of all torques acting on an object equals zero, it is in rotational equilibrium.
How do you calculate torque on a 3 phase motor?
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 torque of a synchronous motor?
Torque in a Synchronous Motor
- Pm=2πNSτg60Watts…( …
- Pm=VIaCos(δ−φ)…( …
- τg=602πPmNS=9.55×PmNSN−m…( …
How do you calculate the torque of a single phase induction motor?
But rotor current/phase,
- and, Rotor Power factor,
- Where, K = Constant of proportionality = 3*60/2π N s
- Now, rotor input,
- But rotor current/phase,
- Therefore, rotor input,
- Where. K = Constant = 3*60/2π N s The above equation is the torque equation for an induction motor under running condition.
Where is torque maximum and minimum?
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.
How do you calculate current from torque?
It states that current through the conductor is directly proportional to applied voltage and is expressed as:
- I = V / R. where I – current, measured in amperes (A); …
- Pin = I * V. …
- Pout = τ * ω …
- ω = rpm * 2π / 60. …
- E = Pout / Pin. …
- Pout = Pin * E. …
- τ * ω = I * V * E.
- τ * rpm * 2π / 60 = I * V * E.
When torque is maximum in electric field?
Torque is maximum when dipole is held perpendicular to the field.