(3) There is no burning of motor and controller in an extruder with switched reluctance motor when three-phase input power is absent, and it can only lead to decrease of input electrical power output.

(4) During the operation of an extruder, there is no such an error that leads to short-circuit devices and burning controller, caused by lack of power devices. 

(5) There is no belt drive in an extruder, but the screw speed can be adjusted accurately. Due to non-winding and rotor cage of the motor, it processes high mechanical strength and reliability of the transmission.