Answer / tathagata

If single phase motor is supplied by ac supply, it will rotet
because single phase motor are universal motor. So it work
for both AC & DC.

But the DC supply must be less than its AC rating, because
in DC there is no reactant .

I=V/(R+jX) (AC)

I=V/R (DC)


So current is vary high which may burnt out the winding.

Answer / santosh

torque in single phase induction motor is produced due to rotating magnetic field. if this motor is fed from dc, the rotating magnetic field is absent and the machine will not run.
also in the absence of reactance in DC, the machine will try to draw high current which will damage the winding.

Answer / alan jenkins

In a nutshell it depends what type of motor it is, some motors with a wound rotor and brushgear will run on AC and DC, however AC induction motors will not rotate, the DC current will have a locking effect on the rotor, hence DC injection braking (anyone heard of that ?)leaving a DC current on these motors for any length of time will heat up the windings.

what is soft starter? what is the difference between soft starter and star delta starter?

1 Answers  

---

What is CCM in Electrical ? where can we use this material?

0 Answers  

---

why are we maintaining some specific gravity in battery ?

5 Answers  

---

What is the difference between Floot charge and Trickle Charge.

1 Answers   Torrent Power,

---

what is dyn 11

3 Answers  

---

---

How do you connect the capacitors on polyphase circuits?

10 Answers   L&T, Transco,

---

What it the purpose of parallel phasing transfomers??

0 Answers   Asia MotorWorks AMW,

---

what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors

0 Answers   Lanco,

---

what is the difference between dry and wet type of 132kV terminations. which one is durable

0 Answers  

---

Why power genaration in India is at 50HZ while America its 60HZ

0 Answers   TATA,

---

Why selected cable colour red yellow and blue in 3 phase Electrical system?

9 Answers   Crompton Greaves, Essar, Gridco,

---

Why current flows in nutral? As per theory there should be no current in 3 ph explain.

11 Answers   Bhel,

---