What is the difference between general-purpose inverter and fan-type inverter
The constant power region and the constant torque region of the load have a great influence on the selection of the transmission scheme. Motor in the constant flux control, the maximum allowable output torque unchanged, are constant torque speed
The constant power nature of the load should be in terms of a certain range of velocity variations. When the speed is very low, by the mechanical strength limit, TL can not be infinitely increased, at low speed into a constant torque properties
Machine tool spindle and rolling mill, paper machine, plastic film production line in the coiler, unwinding machine and other required torque, roughly inversely proportional to the speed, which is the so-called constant power load
When the frequency converter drags the load with constant torque, the torque at low speed should be large enough and have sufficient overload capacity. If you need to run at low speed, you should consider the standard asynchronous motor cooling capacity, to avoid the motor temperature rise is too high.
The load torque TL is always constant or substantially constant regardless of the speed n at any speed. Such as conveyor belt, mixer, extruder and other friction load and crane, hoist equipotential load are constant torque load.
