What is the relation between speed and slip?

The difference between the synchronous speed of the electric motor magnetic field, and the shaft rotating speed is slip – measured in RPM or frequency. Slip increases with increasing load – providing a greater torque.

What is the relation between speed & torque of IM?

Torque is the rotational equivalence of linear force. Speed measures the distance covered in unit time. The relation between torque and speed are inversely proportional to each other. The torque of a rotating object can be mathematically written as the ratio of power and angular velocity.

What is the relation between torque and slip in an AC induction motor * 1 point?

As the slip increases, the speed of the motor decreases with the increase in load. The term (sX 20) 2 becomes large. Hence for heavy loads, torque is inversely proportional to slip.

What is the relation between torque and speed in 3 phase induction motor?

The full load speed of the motor is N. If the mechanical load on the shaft is increased, the motor speed will decrease until the electromagnetic torque (or motor torque) is again equal to the load torque. As soon as the two torques are equal, the motor will run at a constant speed but lower than the previous speed.

Is torque proportional to slip?

Torque is directly proportional to the square of the supply voltage. s X 2 2 ≪ R 2 2 i.e. the effective rotor circuit resistance is very large compared to the rotor reactance. Torque is directly proportional to slip. Thus, torque-slip characteristics are linear in the lower slip region.

How is torque calculated in an induction 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 .

What is the relation between torque and voltage in 3 phase induction motor?

Effect of Change of Supply Voltage on Starting Torque of 3-Phase Induction Motor. Hence, the starting torque is directly proportional to the square of the supply voltage. Therefore, the starting torque is very sensitive to changes in the value of the supply voltage.

What is torque in 3 phase induction?

How do you calculate speed and torque?

1. Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
2. Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
3. Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
4. Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.

Why does torque decreases when speed increases?

The Reason that Torque and Speed are said to be inversely proportional is the ability to generate torque diminishes with increase speed. The reason for this is because the BackEMF opposes the supply that is attempting to force current into the stator, that will generate EM-Torque.

What is the torque slip characteristic of induction motor?

Torque slip characteristic is a curve plotted between the torque and the slip of induction motor. It also gives the relationship between torque and slip. From the above equation, we can conclude below statements and draw the curves. 1) When the rotor speed is equal to the synchronous speed, the slip is zero.

What is the difference between actual speed and torque slip?

Rotor speed or actual speed is the speed at which rotor rotates. The range of slip is between zero to one and the range of rotor speed is between zero (standstill) and (synchronous speed). Torque slip characteristic is a curve plotted between the torque and the slip of induction motor. It also gives the relationship between torque and slip.

Why induced torque is zero in synchronous motor?

3) If the rotor speed is equal to the synchronous speed, induced torque is zero. Torque slip characteristics is depends on the rotor resistance. As the rotor resistance varies, the value of maximum torque remains as it is. It means that, the value of maximum torque is independent from the rotor resistance.

What is the torque of induction motor at standstill?

The induction motor torque varies from zero to full load torque as the slip varies. The slip varies from zero to one. It is zero at no load and one at standstill. From the curve it is seen that the torque is directly proportional to the slip.