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What will happen to speed-torque characteristics of an induction motor is the rotor resistance is increased?
If Rotor resistance is increased torque is increased
What is double cage rotor and deep bar cage rotor?
deep bars in the rotor that result in higher rotor resistance at low speeds thus resulting in larger starting torques. The higher resistance is due to the skin effect.
Why rotor contactor in external resistance of slipring motor connected in delta?
rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled. for more information check torque and speed characteristic of wound motor.
Why use surge protecting resistor to generator rotor winding?
To limit the fault current used surge protective resistance in generator rotor winding to protect the rotor winding heavy damage.
How do you calcuate resistance for slipring motor?
it is related to Slip ring rotor max.currents and voltage ...
What is the total copper loss when rotor is standstill?
It is the supply voltage divided by the rotor resistance including the resistance of the brushes.
What will happen to speed-torque characteristics of an induction motor is the rotor resistance is increased?
If Rotor resistance is increased torque is increased
What is double cage rotor and deep bar cage rotor?
deep bars in the rotor that result in higher rotor resistance at low speeds thus resulting in larger starting torques. The higher resistance is due to the skin effect.
Why rotor contactor in external resistance of slipring motor connected in delta?
rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled. for more information check torque and speed characteristic of wound motor.
Why will the rotor of a wound-rotor motor not turn if the rotor circuit is left open with no resistance connected to it?
Because there is no current flowing in the rotor, and thus there is no magnetic field in the rotor, and thus there is no torque between the rotor and the field.
Why use surge protecting resistor to generator rotor winding?
To limit the fault current used surge protective resistance in generator rotor winding to protect the rotor winding heavy damage.
What are the reasons for connecting resistance in the rotor circuit when starting wound rotor induction motors?
To limit the starting current in slip ring induction motors.
When checking a compressor for locked rotor what meter do I use?
To check a compressor for a locked rotor condition, you should use a digital multimeter set to measure resistance (ohms). Disconnect power to the compressor and measure the resistance between the terminals of the compressor (typically the run, start, and common terminals). A very low or zero resistance reading indicates a shorted winding, while an infinite resistance reading suggests an open winding. If the resistance values are within the manufacturer's specifications, the compressor is likely not locked rotor.
How do you calcuate resistance for slipring motor?
it is related to Slip ring rotor max.currents and voltage ...
Why armature winding resistance is less than field winding resistance?
An 'armature winding' is the rotor winding, and the 'field winding' is the stator winding.
Why the rotor winding of a synchronous motor is usually connected to an external resistance during start up?
because at start the motor draws larger quantity of current and this may affected the rotor windings in order to limit current always resistance is connected.
What type of motor is variable torque produced by varying the resistance of the secondary circuit?
Wound-Rotor
