How to change a dual voltage 3 pase motor from star to delta configuration?

Question

I recently purchased an inverters to convert a three phase lathe to run on a single phase supply, the only snag i have run into, is converting the motor from a star to a delta configuration,There are only four terminals in the motor box , see

http://www.photography.tomwarlow.co.uk/v/gallery/Links/_TOM6845-Edit.jpg.html

There are terminals A, B, C and N

The three brown power wires are attached to each of A ,B and C

A has a red wire going from it

B has a yellow wire

C has A blue wire

N has three wires connected - white, grey and brown,

How do I re wire to get the motor to run in the lower 220V delta configuration?

Answer 1

The motor is really wye connected with N as the wye point.

To change to wye connection, disconnect the wires leading to N, colored white grey and brown. With a multi-tester, check which terminal is the end of A, B and C, and Label them A*,B* and C*.Once the ends of terminals A, B and C are determined.Sketch a Delta connected motor winding with A---------A* connected to B-----------B* and C---------------C*connected to terminalA. Connect A* to B and B* to C. Use a single strand No.20 AWG magnet wire for the test connection. Review the connection and connect the supply wires to A C*; A*B and B*C.The connection is ready for 220 volt supply. Test with 220volt power and check its no load current.Current at noi load should be only 30% of the motor's rating at 220 volts, 3-phase.

Answer 2

Three phases motor cannot run with single phase power. Your motor can only be connected as STAR or DELTA connection with 3 phases power source.