SGMG-09ASAB Industrial Module High Torque Low Speed Servo Motor

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Summary

In this publication, we have shown that the application of AC drive technology to various types of AC elevator motors must rely on a thorough understanding of the clear advantages and tradeoffs, in order to make the very best possible choices for AC drives and motors. Our discussion has included examination of tradeoffs or possible drawbacks including the potential for increased harmonic distortion, radio frequency interference, and other issues that must be addressed in order to use AC technology successfully. Comparison of AC and DC motor and drive technology does not result in a clear-cut “winning” technology to be applied universally. Rather, we have shown that each technology has unique advantages and disadvantages. We have tried to arm the reader with as many facts as possible, given the limitations of the size of this document. As technology evolves, we will endeavor to continue to pass along as much information as possible to benefit our customers.

Recognize that AC drives have an inherent delay in starting, which may affect overall elevator performance time. Unlike DC applications, where the motor field is energized at all times, in AC applications, the motor is energized (via power contactor) on demand. Sufficient time must be allowed for magnetic flux to build within the motor before the brake can be lifted and the elevator car operated. Delay time may vary from 200 milliseconds to over one second, depending on motor characteristics. Therefore, all other factors being the same, the AC motor and drive must tolerate a delay on start which does not exist with DC motors and drives.