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Document Brief

Motor Control...

Control and Automation Solutions Guide...

Introduction...

Motor control design for industrial applications requires attention to both superior performance and ruggedness. Maxim's feature integration and superior specifications enhance motor controller equipment precision while improving robustness in harsh industrial environments. Motor controllers either control variable power supplies to the motor or to electronic switches between the power supply and the motor. These switches are precisely timed to open and close to make the motor rotate most effectively. The timing is often governed by complex mathematical equations based on motor architecture and electromagnetic theory. Depending on the application, a motor controller can be as simple as a variablevoltage generator, a pulsed-DC voltage source, or a complex signal generator requiring sophisticated digital signal processing algorithms to generate the correct timing. For large motors, those in the multihorsepower range with multiple power phases, precise control is essential. At a minimum, the wrong timing can result in extreme power use. In the worst case, wrong timing can destroy the motor and the installation itself. Many electric motors have maximum torque at zero RPM, so these large motors must be soft-started. To reduce maintenance to a minimum, the mechanical mechanisms (clutches) that traditionally provided this softstart capability are rapidly being replaced by electronic soft-starters or variable frequency drives (VFDs). In some applications motors must supply both forward and reverse tension to the load optimally, braking energy from overhauling loads is fed back into the AC line using regenerative VFDs instead of being wasted as heat in large braking resistors or in highmaintenance mechanical brakes. Motor control is a very significant portion of the Control and Automation market. According to U.S. Department of Energy, motor driven equipment accounts for 64% of the electricity consumed by U.S....

industries. Furthermore, electric motors consume about 45% of the world's electricity according to the International Energy Agency (IEA) report of May 2011 on global energy consumption by electric motor driven systems. By comparison, lighting is a distant second consuming 19%. With the cost of energy rising steadily, plant operators look for ways to reduce energy consumption while maintaining throughput. Furthermore, with the availability of reasonably pri...

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Motor Control solutions guide control automation motor control

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