553 Speed Control Methods

Voilée increasing

FIGURE 5.22 Torque-speed profile at different voltages with fixed supply frequency.
FIGURE 5.23 Torque-speed profile with variable frequency but constant V/f ratio.

FIGURE 5.24 Induction motor drive.

FIGURE 5.24 Induction motor drive.

FIGURE 5.25 Torque-speed operating envelope for the induction motor.

Figure 5.25 shows the envelope of the torque speed characteristics of an induction motor. Using a power electronics controlled drive, it is possible to achieve constant power characteristics from an induction motor at higher speeds, a feature that is so important for EV and hybrid vehicle motor drives.

0 0

Post a comment