New Advances in Variable Frequency Drives


Written by:
Steven B. Weston, Eaton Corporation

Advanced Algorithms Deliver

The product of intensive research, advanced algorithms provide energy savings and stability over traditional variable frequency control methods. In response to load conditions, the algorithms dynamically adjust the operating point of the drive and motor system to reduce motor losses and save energy, thus reducing the users' utility bill. By reducing losses in the motor, the algorithms are designed to make the motor as well as the entire system (motor, drive and load) more efficient. Further, advanced algorithms facilitate protective system monitoring and response, and as a result, are able to better able to help the drive operate in optimal boundaries, providing added stability.

For example, comparing one new algorithm to older technology, a 50 hp motor setup could see additional savings of $10,000 to $28,000 through the lifetime of the drive in lightly loaded conditions, typical of pumping and HVAC applications (see Figure 1). These advanced efficiency algorithms allow users to save an additional .5 to 10 percent over the savings they realize now, by applying the drive to a variable torque load.

Fig 1 

Figure 1

Conclusion

Drive technology has come a long way. By adding up the new technological advances built into a drive, users can save more than before. The last 10 years have created advances that allow drives to be more intelligent; they now control more than a motor-they control themselves.

Pumps & Systems, June 2010

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See also:

Upstream Pumping Solutions

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