Recent content by gilver

Daer shahvir when an induction generator is spun above his synchronous frequency, the IG will draw reactive power from the grid , just as it will do as motor but now it'll be capacitive, and the IG will injected active power in the grid the amount is depending on machine constants and slip...

When an induction motor is been driven by a prime mover and nothing connected to the coils. You'll measuring a small voltage on the coils (about 3 v ac). At that instance the machine is working as a synchronous generator with the rotor as rotating field. The rotor can be seen as a permanent...

Dear shahvir You're wright when one moves a shorted coil in a magnetic field (residual in this case) so that it cuts the magnetic field an EMF is generated and a Induction current will flow. Because of this current a counter force (torque) will be produced (braking action as you mentioned)...

Dear shahvir To change the grid frequency you have to try to injected a lot of active power, an amont that's in the same order of the grid power. Because the load is determining the consumption of actif power the power in the grid isn't augmented but the alternators will turn faster instead...

Dear Shahvir go to google enter "prof Riaz machines" the first link is riaz homrpage, click on it and click on animations you'll see best regards gilver

Dear Shahvir just copy the link that's between qoute"s ("ht...") and paste as adres at the top of your internet explorer. it should work best regards Gilver

Dear Shahvir a link where you can see that 3 alternating fileds (static) result in a field that is moving that is sinusoidal distribution of windings "[URL best regards Gilver

Hey Bob S Thanks for the reply The single phase motor isn't a symmetrical one, the main and the aux have different impedance. There are four connections. The capacitor is adjusted for a specific working point; DC-test put a dc -sopurce to the main (aux) and measure the curent. Then you...

Dear Shahvir That 's correct The ccw field is only to explain why the total flux is demagnetizing, as I mentioned before ther's only one flux in the motor. I've put an attachement to this reply fields in a induction motor on load best regards Gilver

Magnetic saturation seems to have a lot of influence on parameter behavior during load test on permanent split capacitor motors. Is there a method to integrate saturation in the equivalent circuit calculations . Is this possible when one uses the classical tests DC-test, Blocked rotor test, no...

Dear Shahvir My statement “both rotating fields generate in the stator coils emfs” ins’t quiet correct First of all a Three phase winding consists of three single phase windings, shifted 120 electrical degrees in space (120,60,40 mechanical degrees for a 2 pole, 4pole , 6pole …) and also...

Dear Shahvir My statement that both rotating fields generate an Emf in the stator coils ins’t quiet correct. You must see that the rotating field produced by the stator coils is nothing else than 3 alternating magnetic fields which are shifted in space over 120 electrical degrees due to...

Dear Shavir The demagnetisation of the mutual flux is due to the fact that when one applies a load on the motor shaft, the first it does is slowing down. Therefore the emf in the rotor is increasing, because the difference between the speed of the rotating field and the motor speed has...

Dear Shavir The demagnetisation of the mutual flux is due to the fact that when one applies a load on the motor shaft, the first it does is slowing down. Therefore the emf in the rotor is increasing, because the difference between the speed of the rotating field and the motor speed has...

When the rotor is blocked, the 3ph motor acts as a shorted transformer, the rotor frequency at that moment is maximum. So the rotating airgap field encounters a very strong rotating field in the rotor(of course in the opposite direction). Therefore the mutual flux is decreasing . Because...