Q. What points should I consider for selecting a variable frequency drive?
A.
- Environment
- Speed range
- Speed variation allowed
- Torque requirements
- Acceleration time
- Duty cycle
Q. Why is a variable frequency drive required for a permanent magnet AC motor?
A. Permanent magnet motors reach full speed / torque almost immediately after actuation. The shock load by a normal power supply can often damage the connected mechanical components. The voltage supplied must be controlled. The VFDs play a big role here by matching motors with their respective power supply. However, users should not run more than 1 motor on a single variable frequency drive (VFD).