|
If you use field orientated control you get about 15% extra (IIRC) out of the same supply compared to normal sinewaves as is used by V/Hz control. There is very little to be gained in a system, apart from electronic switch efficiencies and careful design, when using FOC compared to other strategies. It also give low-end torque which is lacking in V/Hz schemes.
Unfortunately, using FOC means that the drive is doing funny things to the motor, and the current seen by each phase make sense to the controller only. We therefore have to rely on what the drive tells us, or measure on the DC side, and calculate what it would be if it was a V/Hz drive.
Dawid
|