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Written by Chris Rayburn, Fluke Corporation
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Due to the delicate nature of the cranberry, pump failure is not an option
When a pump or motor fails at Sea Wind Cranberry Farm in Langlois, Ore., farm manager Knute Andersson’s business is at stake. An equipment malfunction could allow the farm’s cranberry fields to cool just a couple degrees, and on a cold night, that can mean losing part of the crop. For modern cranberry farmers, properly functioning pumps, motors and sprinklers help ensure that their berry yield will be high. Without them, the berries are at the mercy of hostile climates that can cause crop-killing frost or destructive heat.
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Written by Jen Yao, Frost & Sullivan
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The freefall in electric motor sales is a direct effect of the worldwide economic downturn, which has severely depressed industrial and commercial productions. Despite the 20 to 30 percent drop in motor sales in 2009, manufacturers remain optimistic about the future market landscape, as the economic recovery, the need to improve energy efficiency and the demand in high growth sectors will create need for high performance motors.
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Written by Joe Evans
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Last of four parts
Last month, we studied the properties and effects of resistive, inductive and capacitive loads in an AC circuit. This month, we will take self induction a step further and apply it to that very simple machine that is at the heart of AC power—the transformer.
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Written by Joe Evans, Ph. D.
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AC Circuit Loads
Last month we discussed the relationship between voltage and frequency and tried to make that somewhat complex three phase sine wave a bit more understandable. This month we will quickly look at the load types that comprise a typical AC circuit.
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Written by Kitt Butler and David Berkowitz, Advanced Energy
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What pump manufacturers and pump users need to know about small electric motor regulations. Second of Two Parts.
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Written by Joe Evans, Ph.D.
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Last month, we ended with a discussion of the relationship between peak and RMS (or effective) voltage. We found that the RMS voltage will always be 0.707 that of peak voltage, and peak voltage will always be 1.414 that of RMS voltage. This relationship holds true regardless of the sine wave frequency. But, as frequency changes, the total voltage applied to a circuit per cycle can differ substantially. To visualize this difference, we will need to introduce another unit of measure-volts per hertz.
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Written by Kitt Butler and David Berkowitz, Advanced Energy
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Integral Hp AC motors Between 1-500 hp
The Energy Independence and Security Act of 2007 (EISA), which restates and broadens the definition of General Purpose Electric Motors, goes into effect on December 19, 2010. Certain motors "manufactured (alone or as a component of another piece of equipment)" will be required to have nominal full load efficiencies that meet the levels defined in NEMA MG-1 (2006) (see Table 12-12). Motors manufactured after December 19, 2010, must comply with the law.
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Written by Joe Evans, PH.D.
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First of Three Parts
This three part primer is a basic introduction to AC power for those in the pump industry who need a place to start. It will also provide several web references to access if you would like to further your understanding of this interesting and essential topic.
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Written by John Malik, TB Wood’s (an Altra Industrial Motion company)
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Most of us probably never notice the spinning cylinder mounted between the pump and motor, except how easy it is to dis/assemble when a pump or motor is changed out. Otherwise, the disc coupling never factors into our daily routine.
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Written by Larry Thau, Victaulic
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Unanticipated noise and vibration can be problematic for both occupants and processes within structures. Noise and vibration in piping systems can originate at pumps and other mechanical equipment. If the system design does not accommodate vibration, a variety of issues ranging from annoyances to actual business interruptions can occur.
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