and can limit the number of available starts per hour.
When compared to traditional high-pole-count motors, choosing vertical gearmotor technology for low-speed,
high-horsepower vertical pumping applications will help reduce
costs, improve efficiency, and increase system performance. All
of these advantages prove that bigger isn’t always better. WW
About the Author: Michael T. Myers is the global business manager of controlled
start transmission (CST), large, and specialty gearing for Baldor Electric Company.
Circle No. 244 on Reader Service Card
needs to be controlled during starting and priming to ensure adequate torque is supplied during start up and prevent damage
from water hammer. This is commonly done by using valves to
close a portion of the discharge piping then starting the motor,
followed by slowly opening the valves to prime the system.
Another alternative to control the application is through an expensive VFD drive.
A vertical gearmotor drive provides an alternative by including an integral mechanical hydroviscous clutch within the planetary gear set to soft start the pump. The hydroviscous clutch
is disengaged until the motor starts and comes to full speed
unloaded. After the motor attains full speed, the clutch is engaged slowly to accelerate the load under a tightly controlled
acceleration curve, minimizing the impact on the power system
and providing the soft start needed to prime the pump system.
A benefit to achieving base motor speed under no load is
the ability, when starting a pump, to utilize the high torque
of a standard motor design that is available when the motor
is operated near base speed. This can prevent the need for
a special motor design to maintain a high motor torque as it
moves through the pull-up torque portion of the motor curve.
These special motor designs are more expensive, have higher inrush currents, are less efficient, generate additional heat,
0 20 40 60 80 100 120
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