There are a lot of processes that require continuous, smooth running, rotary motion. But sometimes two dierent speeds are necessary. Inverters or servos can’t always deal with the dierences. In a lot of applications variable speed can be accomplished with an inverter. By varying the hertz a motor can operate at a relatively wide speed range. However, when running above 60 Hz there is usually a drop o in output torque. And when the hertz drop below 20, in many instances additional cooling is necessary because the fan isn’t turning fast enough. And when running as low as 2 – 3 HZ the signal becomes erratic and rotary motion isn’t as smooth. With servomotors, variable speed is also possible. We’ve probably all seen the display at trade shows where the servo makes small steps then quickly r

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