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Why the no-load current of an induction motor is high compared to a transformer?
Wiki User
∙ 12y ago
Because of the presence of the air-gap between stator and rotor in motor the magnetization current is much higher than that of a transformer in addition to the friction and windage losses due to the rotation of the rotor.
Wiki User
∙ 12y ago
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Why isolators can be operated only under noload?
It is because that Isolators does not have any arc quenching medium with it, Whenever you make or break any contacts on load it produces arc which is to be quenched or it may harm man & material. Therefore it is not advisable to operate Isolators at on load condition.
What type of ac motor will operate at a constant speed from no load to full load?
The Synchronous motors will operate at a constant speed from noload to fullload. Even it is classified as an AC motor, we have to fed the motor both AC and DC supplies. That we have to supply DC to the Field (Normally Rotor) and AC to the Armature (Normally Stator).
What are some of the applications of shunt motors?
1. D.C Shunt Motors:It is a constant speed motor.Where the speed is required to remain almost constant from noload to full load.Where the load has to be driven at a number of speeds and any one of which is nearly constant. Industrial use: Lathes Drills Boring mills Shapers Spinning and Weaving machines. 2. D.CSeries motor: It is a variable speed motor.The speed is low at high torque.At light or no load ,the motor speed attains dangerously high speed.The motor has a high starting torque.(elevators,electric traction) Industrial Uses: Electric traction Cranes Elevators Air compressor Vacuum cleaner Hair drier Sewing machine 3. D.C Compound motor: Differential compound motors are rarely used because of its poor torque characteristics. Industrial uses: PressesShears Reciprocating machine.
Why noload current in big motors is higher than load current?
That is not always true.
Why isolators can be operated only under noload?
It is because that Isolators does not have any arc quenching medium with it, Whenever you make or break any contacts on load it produces arc which is to be quenched or it may harm man & material. Therefore it is not advisable to operate Isolators at on load condition.
What type of ac motor will operate at a constant speed from no load to full load?
The Synchronous motors will operate at a constant speed from noload to fullload. Even it is classified as an AC motor, we have to fed the motor both AC and DC supplies. That we have to supply DC to the Field (Normally Rotor) and AC to the Armature (Normally Stator).
What are some of the applications of shunt motors?
1. D.C Shunt Motors:It is a constant speed motor.Where the speed is required to remain almost constant from noload to full load.Where the load has to be driven at a number of speeds and any one of which is nearly constant. Industrial use: Lathes Drills Boring mills Shapers Spinning and Weaving machines. 2. D.CSeries motor: It is a variable speed motor.The speed is low at high torque.At light or no load ,the motor speed attains dangerously high speed.The motor has a high starting torque.(elevators,electric traction) Industrial Uses: Electric traction Cranes Elevators Air compressor Vacuum cleaner Hair drier Sewing machine 3. D.C Compound motor: Differential compound motors are rarely used because of its poor torque characteristics. Industrial uses: PressesShears Reciprocating machine.
What are applications of DC motors?
1. D.C Shunt Motors: It is a constant speed motor.Where the speed is required to remain almost constant from noload to full load.Where the load has to be driven at a number of speeds and any one of which is nearly constant. Industrial use: Lathes Drills Boring mills Shapers Spinning and Weaving machines. 2. D.CSeries motor: It is a variable speed motor.The speed is low at high Page on torque at light or no load ,the motor speed attains dangerously high speed.The motor has a high starting torque.(elevators,electric traction) Industrial Uses: Electric traction Cranes Elevators Air compressor Vacuum cleaner Hair drier Sewing machine 3. D.C Compound motor:Differential compound motors are rarely used because of its poor torque characteristics. Industrial uses: PressesShears Reciprocating machine.
