Electrical Engineering ⇒ Topic : Torque of Synchronous Motors
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Lalan
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TORQUE OF SYNCHRONOUS MOTORS (1) Starting Torque It indicates the ability of the motor to accelerate the load. Sometimes it is also called as break away torque. In centrifugal pumps, it is 10% of full-load torque whereas in reciprocating two cylindrical compressors, it is 200 to 250% of full-load torque. (2) Running Torque The motor under running condition develops this torque. It is determined by the output power and the speed of the driven machine. (3) Pull Torque The ability of the motor to pull-into synchronism while changing from induction to synchronous motor operation is called pull torque. (4) Pull-out Torque It is the maximum torque that the motor will develop without pulling out of synchronism. Its value varies from 1.25 to 3.5 times the full-load torque. | |
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