Sensorless and energy-efficient PMSM fan drive

The article presents the problem of sensor less frequency control of synchronous permanent magnets motor without damping cage by the principle of v/f , to drive the fan. In order to reduce power consumption of the drive system in the laboratory the optimal voltage to the motor frequency characteristics were determined. The study was conducted on a laboratory set-up consisting of two coupled PMSM machines where one machine was supplied by a transistor inverter, and the other was a passive load. A new criterion based on minimizing of the stator current vector module was proposed and optimization algorithm in steady states was tested. The lab results confirm the validity of the solution to drive the fan