✔ Induction Motor Load Curve

Induction Motor Load Curve

- February 20, 2018

After that the motor is accelerated hence the torque first drops a little is called minimum torque tmin and then rise to its max. This curve is called the torque speed characteristic curve.

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The torque slip curve for an induction motor gives us the information about the variation of torque with the slip.

Induction motor load curve. Equation 4 the slip method the slip method for estimating motor load is recommended when only operating speed measurements are avail able. A perform load test on 3 phase induction motor. As we see from the above motor speed torque curve for an induction motor.

B compute torque output power input power efficiency input power factor and slip for every load setting and to determine how speed efficiency power factor stator current torque and slip of an induction motor vary with load. The plots below show a number of different torque speed curves due to differences in the motor designs. Using the equivalent circuit of the three phase induction motor and some additional information about the mechanical and core loses one could calculate the performance of the three phase induction motor from no load to full load.

Figure 1 showed a plot of induction motor torque vs speed from zero to synchronous speed. When the motor starts the torque is high is called starting torque ts. We can derive an equation from the equivalent circuit that allows the calculation of the torque for a given value of slip.

Load test on three phase induction motor aim. Slip of a power induction motor is 2 to 3 when the motor is operated under the rated load. Figure 1 shows a set of generic curves of efficiency current power factor and slip for an induction motor.

The torque increases. The equation that relates motor load to measured current values is shown in equation 4. An induction motor can therefore be made without electrical connections to the rotor.

In the area to the right of the maximum torque on the characteristic curve increase in the load does not so much reduce the speed of low impedance motors. The motoring region of the induction machine torque speed curve is the region of greatest interest. Currentspeed curve of an induction motor it is a v shaped curve having a minimum value at synchronous speed.

An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Value before dropping is called maximum torque tmax. An induction motors rotor can be either wound type or squirrel cage type.

Since flux is purposely kept constant it means that magnetising current is the same at all synchronous speeds. The slip is defined as the ratio of difference of synchronous speed and actual rotor speed to the synchronous speed of the machine. The synchronous speed of an induction motor depends on the frequency of the power supply and on the.

This minimum is equal to the magnetising current which is needed to create flux in the machine. The above value becomes somewhat larger with small single phase motors. Consider each of these curves.