(Motor Controls and Drives)
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TSA Manufacturing in Omaha, Neb., provides steel products and services to the construction, precast concrete, and structural steel markets. One machine-a thread roller that makes long steel threaded... (View Full Article)
(Motor Controls and Drives)
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This paper revisits a non regenerative active front end system that has been studied in the past but offers significant improvements to make it acceptable to the drives industry. A three-phase current... (View Full Article)
(Motor Controls and Drives)
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The process of wire drawing has in effect changed very little over the years. It uses a combination of a die and/or a series of dies to draw wire to a selected gauge. Drawn wire is in many... (View Full Article)
(Motor Controls and Drives)
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Regardless of whether they are used in processing plants or in discrete manufacturing, commercial, municipal, or institutional facilities-motors that are started across the line require large amounts... (View Full Article)
(Motor Controls and Drives)
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Many organizations want to save energy because of increasing costs for electric power. Costs for electricity vary widely across the U.S., with most utility rates rising steadily for a variety of... (View Full Article)
(Motors)
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In the induction motor, slip frequency (i.e., the frequency difference between stator rotating flux and mechanical rotating speed) induces current in the rotor windings. The interaction between... (View Full Article)
(Motor Controls and Drives)
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Variable frequency drives (VFD) are becoming more common place and more widely used in applications. They are capable of varying the output speed of a motor without the need for mechanical pulleys,... (View Full Article)
(Motor Controls and Drives)
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Automatic retry can double the noise immunity of real-time industrial Ethernet-based motion networks.... (View Full Article)
(Process Controllers)
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Designers of real-time motion control systems expect Ethernet-based motion networks to transport cyclic command and feedback data at specified intervals with perfect data integrity. The designer's... (View Full Article)
(Motor Controls and Drives)
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Imagine you are a surgeon in the middle of a major operation. Suddenly, one of the variable-frequency drives (VFDs) in your operating-room air-handling system develops a fault and stops running,... (View Full Article)
(Motor Controls and Drives)
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When an electric motor is driven by a variable frequency drive (VFD), electric power delivered to the motor is regenerated while the motor decelerates by applying negative torque to the motor shaft.... (View Full Article)
(Motor Controls and Drives)
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Precise speed control of AC motors is typically accomplished with a variable frequency drive (VFD) connected to a speed or position feedback sensor. In certain situations, however, it's possible to... (View Full Article)
(Motor Controls and Drives)
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Learn the terminology used to describe VFD internal operations and external interfaces - and you'll understand their application more thoroughly.... (View Full Article)
(Motor Controls and Drives)
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In very basic terms, power factor is expressed as the ratio of real power, kilowatts (kW), to apparent power, kilovolt-amperes (kVA). A desirable ratio of near unity results when the real power and... (View Full Article)
(Motor Controls and Drives)
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Controlling Multiple Motors with One VFD Saves Money and Space... (View Full Article)