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why when start induction motor the torque oscillate before become constant, like the following matlab torque simulation graph . enter image description here

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  • \$\begingroup\$ 27 Hz with no load ?? Pulse torque at ?? Hz and what motor characteristics. What do you suppose it is? \$\endgroup\$ – Sunnyskyguy EE75 May 22 at 3:02
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The torque delivery of an induction motor oscillates if;

If the incoming supply is unbalanced.The unbalance voltage cause unbalance current. The unbalance current cause the negative torque in the motor. Also unbalance winding resistance produce the oscillating torque

The induction motor gives the best performance if the supply voltage is perfectly sinusoidal and the impedance of the stator and rotor winding is balanced.

Read More:Motor torque under unbalance voltage and/or unbalance impedance

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