Answer / raghavendran r

Stalling is a condition when the motor stops rotating.This
condition occurs when the load torque is greater than the
motor shaft torque ie break down torque condition.In this
condition the motor draws maximum current but the motor do
not rotate.The current is called as Stalling current.

Answer / ali hassan mirza

Stalling of the motor refers to a condition, where the motor is unable to rotate. This condition can be caused either due to any obstruction in the load or due to any problem with the motor such as bearing seizure, etc.

This condition is also known as locked rotor.


When the speed of the rotor decreases to a very low value or stops completely due to stalling, the slip of the induction motor increases. This causes higher voltage and consequently higher current to be induced in the rotor windings.

The stator currents also increase. The equivalent of the motor stalled condition is that of a transformer whose secondary is short circuited.

The high current drawn will cause damage to the windings and cause the rotor to heat up.

Stall protection devices work by monitoring the motor current and the speed. If the motor draws higher current at a preset low speed, the relay is activated

why tertiary winding is used in transformer with diagram?

0 Answers  

---

what is Aircraft earthing and what does it do?

6 Answers  

---

In constant power region of 3-phase IM torque-speed characteristics, if frequency increases flux A does not alter B decreases C increases D none of above

0 Answers  

---

Is there any thumb rule for cable selection for any current rating ?

1 Answers  

---

Type of cable insulation?

3 Answers   Essar,

---

---

define transient state &steady state

1 Answers  

---

HOW MUCH KVA DG SET REQUIRED for charging 12v 4000 ah battery?

3 Answers  

---

How do you compute voltage drop and cable size over distance?

0 Answers  

---

working principles of a generator

3 Answers   Cairn,

---

What is the correct procedure to shutdown VCB in 11kv substation.safety and work procedure

3 Answers   EGA,

---

Compare salient pole and cylindrical rotor machines.

0 Answers  

---

type of transformer

3 Answers  

---