RFC motor control: good speed accuracy without encoders

摘要

Rotor Flux Control (RFC) is a major advantage for applications where a combination of dynamic performance, stability, and speed accuracy are required without encoder feedback and where low audible noise is important. The open loop speed control algorithm is now available on Control Techniques' Unidrive SP range of AC drives. This is another first for Control Techniques,' says product manager Richard Smith. 'With RFC, we can provide a simulated speed feedback that gives excellent speed accuracy; certainly the best resu Its without actually having the cost of direct feedback from an encoder.'