by Xiangsu extruder">http://www.extruderschina.com">extruder
Extruder with switched reluctance has the following advantages:
(1) the speed of screw with long-term operation can be adjusted from zero to the highest speed in the range of stepless speed regulation, with high efficiency and smaller temperature rise of motor and controller.
(2) When an extruder begins to work, it is not possible to bring about the starting current, which is more than the original rated current 5 to 7 times. Meanwhile, there is no need to start an extruder with lower pressure, for the starting current can be smoothly increased as the current requires. The longer the start-up time is, the smaller the starting current will be. When the starting torque reaches 150% of rated torque, the starting current is only 30% of rated current.
(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, but 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.
The screw of an extruder driven by switched reluctance motor can be operated through the gear of the motor, which can realize speed control under extrusion rate and the pressure. Generally, an extruder processes its own characteristics: wide range of speed adjustment, steady speed and high precision, small starting current, large starting torque. Due to a small heat-driven system, the occurrence of burning motor and controller is significantly reduced. In particular, it is very efficient to save energy, and the quantity of energy-saving is around 11%, compared with the variable frequency speed regulation system. Such an extruder has made a lot of progress: simple structure, digital control, stepless speed regulation, and high efficiency energy-saving requirements.
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