Table of Contents
What advantages does the wound rotor motor offer?
Wound Rotor Induction Motor Qualities Excellent starting torque for high inertia loads. Low starting current compared to squirrel cage induction motor. Speed is the resistance variable over 50% to 100% full speed. Higher maintenance of brushes and slip rings compared to squirrel cage motor.
What is the advantage of phase wound rotor?
Two advantages of Phase wound rotor. Providing extra torque in start up. Changing the speed-torque / current characteristics. The construction of phase wound rotor is like that external resistance can be added series to rotor circuit.
What is the advantage of wound rotor induction generator?
The advantages of this type are high efficiency, good power quality, and lower mechanical stress while the disadvantages are complicity of construction and high cost. The rotor speed of induction generators (IGs) is adjusted by means of a converter system [1,2].
Which of the following are the advantages of using a slip ring motor?
The following are the advantages of slip ring induction motor: They have smooth acceleration under heavy loads. They have high overloading capacity. The speeds of induction motor with slip rings can be adjusted with the help of a resistance.
What are the advantages of rotor resistance starting method for wound rotor induction motor compound with the other alternatives?
Starting of Wound Rotor Induction Motor By increasing the rotor resistance, the rotor current is reduced at starting, and hence stator current is also reduced but at the same time torque is increased due to improvement in power factor.
What is the advantage of starting a slip ring induction motor with the help of rotor resistance as compared to other?
The slip ring induction motor has a high starting torque as the resistance of the rotor winding is increased by adding the external resistance to it. The starting torque is increased as the power factor of the rotor circuit gets improved during starting.
What are the advantages and disadvantages of wound rotor induction motor?
Initial and maintenance cost is more compared to squirrel cage motor because presence of slip rings, brushes, short circuiting devices etc. Speed regulation is poor when operated with external resistances in rotor circuit. Efficiency and power factor of slip ring motor is lower compared to squirrel cage induction motor.
What is the advantage of the wound rotor motor over the squirrel cage motor?
Ans. The wound-rotor motors have the following advantages over the squirrel cage motors : (i) High starting torque and low starting current. (ii) Smooth acceleration under heavy load.
Where are wound rotor motors used?
Wound Rotor Induction Motor is used in applications which require smooth start and adjustable speed. Some of the applications of this motor include cranes, mills, hoists and conveyors. Wound rotor induction motor is also used in fans, blowers and mixers. They are used in large pumps in water industry.
What are the advantages and disadvantages of rotor resistance control?
Advantages and disadvantages of rotor resistance control
- Absence of in-rush starting current.
- Availability of full rated torque at starting.
- High line power factor.
- Absence of line current harmonics.
- Smooth and wide range of speed control.
What are the advantages and disadvantages of rotor resistance control explain in detail?
Because of low cost and high torque capability at low speeds, rotor resistance control is employed in cranes, Ward Leonard Ilgener Drives, and other intermittent load applications. Major disadvantage is low efficiency due to additional losses in resistor connected in the rotor circuit.
What is the advantage of starting a slip ring induction motor with the help of rotor resistance as compared to other method Mcq?
In the case of slip ring motors, the rotor resistance is increased by the addition of external resistance. This external resistance makes the rotor circuit current low. Hence by increasing the rotor resistance, we can improve the starting torque of the wound rotor induction motor (W.R.I.M.).
What is the advantage of starting a slip ring induction motor with the help?
High torque during start-up: Because the resistance of the rotor winding is raised by adding external resistance, the slip ring induction motor has a high beginning torque. As the power factor of the rotor circuit improves during startup, the beginning torque increases.
What is the advantage of the wound-rotor motor over the squirrel cage motor?
What are the advantages of using wound-rotor induction motor over squirrel cage induction motor?
Another important advantage over squirrel-cage motors is higher starting torque. The speed and torque characteristics of a wound-rotor motor can be adjusted by changing the external resistance, unlike a squirrel cage motor which has a fixed characteristic. This is useful for speed control of the motor.
What are the advantage and disadvantage of squirrel cage motor over a wound rotor motor?
Squirrel Cage Induction motors are cheaper in cost compared to Slip Ring Induction motors. Requires less maintenance and rugged construction. Because of the absence of slip rings, brushes maintenance duration and cost associated with the wear and tear of brushes are minimized.
What is the function of wound rotor?
A wound rotor induction motor is used where starting current is too high as compared to the capacity of the power system. A wound rotor or slip ring induction motor is used for driving machines that use large flywheels to carry peak loads such as punch presses and shears.
What are the differences between wound rotor and squirrel cage induction motors?
Difference squirrel cage rotor and wound or slip cage rotor This rotor is in the form of 3 phase winding. In squirrel cage rotor no slip rings or brushes. In wound or slip rotor slip rings and brushes are used. It has a simple construction.
What are the advantages of rotor resistance starting method for wound rotor induction motor?
What are the advantages and disadvantages of a squirrel cage motor over a wound rotor motor?
What is the advantage of a wound rotor motor?
The wound-rotor motor is particularly effective in applications where using a squirrel-cage motor may result in a starting current that’s too high for the capacity of the power system. In addition, the wound-rotor motor is appropriate for high-inertia loads having a long acceleration time.
How is the inrush current minimized in wound rotor motors?
The inrush current is what is minimized in wound rotor motors by increasing the resistance in the rotor windings (I=V/R, where R is increased), and why they have such smooth starting characteristics. The most important specification for wound rotor motors is how they operate once powered, and this is visualized through torque-speed graphs.
What is the purpose of slip rings on a wound rotor motor?
What is the Purpose of the Slip Rings Located on the Rotor Shaft of a Wound Rotor Motor? The purpose of the slip rings located on the rotor shaft of a wound rotor motor is to connect external resistance in the rotor circuit in the form of a star-connected rheostat.
How is a wound rotor motor different from a squirrel cage motor?
The configuration and construction of wound-rotor motors are different from squirrel-cage motors, basically in the design of the rotor. Also, they incorporate brushes and slip rings. The windings (bars on a laminated core) on a squirrel-cage motor are short-circuited by an end ring.