See more detailed information on VFDs at the 'Handy Information' page of 'Corrimal Community Men's Shed' website - link above.
Variable Frequency Drive Basics.
Generally in Australia 3 phase AC Induction motors are supplied connected in Star for use on a 3 phase 415 volt 50 Hz supply.
If the VF drive unit is a model that requires a single phase 240 volt 50 Hz supply then the motor stator has to be connected in Delta configuration (as per diagram above). If the VF drive unit is a model that requries a 3 phase 415 volt 50Hz supply then the motor stator has to be connected in Star configuration. See diagram below...
If the VF drive unit is a model that requires a single phase 240 volt 50 Hz supply then the motor stator has to be connected in Delta configuration (as per diagram above). If the VF drive unit is a model that requries a 3 phase 415 volt 50Hz supply then the motor stator has to be connected in Star configuration. See diagram below...
Below is an example of a connection diagram. Usually displayed inside the motor's terminal box lid:
Maximum Frequency Setting for Cyclone Dust Collection Drives.
The VFD maximum frequency should be set at 60Hz for two reasons:
1. The induction motor manufacturers balance their motors at 60Hz and guarantee them under warranty up to 60Hz.
2. The output torque of the motor reduces above ~60Hz. See curve below...
The VFD maximum frequency should be set at 60Hz for two reasons:
1. The induction motor manufacturers balance their motors at 60Hz and guarantee them under warranty up to 60Hz.
2. The output torque of the motor reduces above ~60Hz. See curve below...
We run our Cyclone Dust Collector at 58 Hz. (~3480RPM)....this provides ample suction.
Explanation of Torque:
Torque is defined as a twisting force that tends to cause rotation. We call the point where the object rotates the axis of rotation.
Newton's Law of Rotation...