The answer to your question is no. One end of each star winding is connected internally to the neutral point. Since the neutral connection is internal, it cannot be opened to make a delta.
Should a motor be wired in Star or Delta?
400v delta/690v star motors should always be connected in delta to a 400v supply as connecting in star gives 1/3 of the rated output power (as above), so if only 1/3 of the power is needed then a smaller, cheaper motor should be used.
Can we run a motor in star connection?
3-phase Induction motor can run continuesly on full-load in star connection provided the motor is designed and constructed for star connected 3-phase stator winding. Usually motor meant to operate in high voltage supply.
Why do motor run in Delta not in Star?
Again, star/delta switching reduces the starting current whilst giving the full load torque in delta for running, provided that the torque requirements of the load can accommodate the reduced starting torque, otherwise the motor will not start, or accelerate to full slip speed.
How can you tell if a motor is delta or star?
A star only motor has four terminals, three phase terminals and a neutral. A delta only motor has three phase terminals only. A motor designed to be operated either star or delta has each end of each winding brought out, so you have six terminals to work with.
What draws more current Star or Delta?
When connected in Star there are now 2 windings in series between each line supply voltage. So the start connection draws less current that the delta connection. The star connection is mostly used to start larger motors and then switched to the delta configuration for normal running when the motor is up to speed.
Why motors are Delta connected?
The delta connection in a motor is used because it provides more power and starting torque. But the starting current is high. The star connection is used where you may want to reduce the starting current of a motor to get it up to speed and then connect in delta for normal running mode.