Drives connected in Master-Follower application
When motors run on a common shaft or other belted or mechanical connection, and run with the same speed or torque, use the master/follower configuration.
Partial 12-pulse Master-Follower configuration
Under this configuration, converters are fed by a 12-pulse transformer with separated secondary windings whose phase positions differ by 30°. This configuration delivers the same advantages concerning harmonics to the network as a standard 12-pulse application (see next item), but no T-reactor is needed.
Typical configuration for high power drives connected in 12-pulse parallel, serial or sequential application
12-pulse systems are used to reduce line harmonics or motor noise level, or to increase output current or voltage of the converter system. Only the 11th and 13th, the 23rd and 25th, the 35th etc. are present. The harmonics on the DC side are reduced also, which increases efficiency.