woody wrote: If you're feeling keen you can pull apart these insulated wires and maybe convert to 2 pole 30kW by reversing A2,B2,C2 connections.
Can someone help me imagine this correctly?
The 2 pole would probably be less efficient that a dedicated two pole, more like a dahlander 2 speed.
Each of A1 and A2 with the same current would now be making a field in the same direction (e.g. left to right) instead of against each other (e.g. outer to inner) + a consequent/phantom pole (inner to outer).
So that means only half the flux lines for the rotor to cut, i.e a quarter of the torque.
We can't increase the current as we're all out of voltage.
I'm not helping, am I.
going back to dahlander:
Motor Book wrote:
Constant torque Dahlander is For constant torque, the motor is usually connected two-parallel star for high speed and series-delta for low speed.
For constant horsepower the connection is two-parallel star for low speed and series delta for high speed.
Both of dahlander windings require series delta.
Back to crazy ideas:
Rewind for 2/3 voltage:
Cut the jumpers between the concentric windings and re-pair them as
Outer + Inner, Inner + outer, Middle + Middle for approximately the same resistance.
I.E. A is currently made up of ('=' means coils '-' means series connection)
1=12-2=11-3=10 in parallel with 19=30-20=29-21=28
Reconnecting the coils as:
1=12-21=28 and 2=11-20=29 and 3=10-19=30 in parallel
This gives Mal 480V star (720V * 2/3) and 275V delta.
Worth a bash when you have the money for a rewind when it all goes pear-shaped.
275V should give 230Nm @ 2200rpm (56kph) i.e. 53kW
0-90 in 17 seconds instead of 31.
top speed 120 instead of 95