Answer / tariq mahmood

The slip ring or wound rotor motor is an induction machine
where the rotor comprises a set of coils that are terminated
in slip rings to which external impedances can be connected.
The stator is the same as is used with a standard squirrel
cage motor.
The slip ring motor is used primarily to start a high
inertia load or a load that requires a very high starting
torque across the full speed range. By correctly selecting
the resistors used in the secondary resistance or slip ring
starter, the motor is able to produce maximum torque at a
relatively low current from zero speed to full speed. A
secondary use of the slip ring motor, is to provide a means
of speed control. Because the torque curve of the motor is
effectivley modified by the resistance connected to the
rotor circuit, the speed of the motor can be altered.
Increasing the value of resistance on the rotor circuit will
move the speed of maximum torque down. If the resistance
connected to the rotor is increased beyond the point where
the maximum torque occurs at zero speed, the torque will be
further reduced.
NOTE:
The all above said characteristic of slip ring motor is due
to slip ring as well as due to external resistance. All
characteristic are related to is starting period or for
speed control. when we disconnected the resistance from the
circuit then slip ring motor and induction motor will be
same. So, hope the reason, "why slipring motor , at full
speed run as squirrel cage motor" will be cleared.

what is the VA(Volt-amphere)? define with calculation?

0 Answers  

---

How does PLC work for sychronising of Two or more DG sets?

0 Answers  

---

what is the difference between relay and a contactor.

5 Answers   Siemens,

---

How do we arrive at selecting reactive capacitance value as 30% of h.p rating of motor?

0 Answers  

---

What is the Gap Should maintain for HT cables crossing of LT Cable?

2 Answers  

---

Is it necessary to carry out sheath test after cable jointing? If the value is zero of such instance , is it ok to energize the cable?

1 Answers  

---

How can we convert the motor to generator and also generator to motor

2 Answers   Aesco,

---

Why front mounted CT polarities are always towards breaker?

0 Answers  

---

how synchronous generator can be used as synchronous condenser?

3 Answers   Monnet, Wipro,

---

in dc machines in the armature nature of power is ac but why we take rasistance instead of impedance?

1 Answers  

---

How to apply 'c' license and also explain what is difference between 'c' and 'b'license.i am also working in one of the private company.i have finished my diploma in 2014 .i have already finished in ITI electrician course.....

0 Answers  

---

What are the safety equipments you should use while you are in a hvac switch yard

1 Answers   GPSC Gujarat Public Service Commission,

---