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Permanent-magnet (PM) field DC rotary motors have proven to be reliable drives for motion control applications where high efficiency, high starting torque, and linear speed torque curves are desirable characteristics. While they share many of the characteristics of conventional rotary series, shunt, and compound-wound brush-type DC motors, PM DC servomotors increased in popularity with the introduction of stronger ceramic and rare-earth magnets made from such materials as neodymium iron boron and the fact that these motors can be driven easily by microprocessor-based controllers. The replacement of a wound field with permanent magnets eliminates both the need for separate field excitation and the electrical losses that occur in those field windings. Because there are both brush-type and brushless DC servomotors, the term DC motor implies that it is brushtype or requires mechanical commutation unless it is modified by the term brushless. Permanent-magnet DC brush-type servomotors can also have armatures formed as laminated coils in disk or cup shapes. They are lightweight, low-inertia armatures that permit the motors to accelerate faster than the heavier conventional wound armatures. The increased field strength of the ceramic and rare-earth magnets permitted the construction of DC motors that are both smaller and lighter

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

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than earlier generation comparably rated DC motors with alnico (aluminum nickel cobalt or AlNiCo) magnets. Moreover, integrated circuitry and microprocessors have increased the reliability and costeffectiveness of digital motion controllers and motor drivers or amplifiers while permitting them to be packaged in smaller and lighter cases, thus reducing the size and weight of complete, integrated motioncontrol systems.

of words, it s being ruthless about how you edit the story you want to tell. Anything that others could claim just as well as you can, eliminate. Anything that requires a complex analysis to prove, forget. Anything that doesn t fit with your customers perceptions, avoid.

bandwidth by adding extra wavelengths and has a theoretical bandwidth of 5,000 GHz in the 1,550 nm region. Notice that in applications where recoverability is essential, SONET (TDM) will still be the first choice because of SONET s 50-ms recoverability. In the case of a path interruption, this is something DWDM cannot achieve today by itself.

The design feature that distinguishes the brush-type PM DC servomotor, as shown in Figure 1-17, from other brush-type DC motors is the use of a permanent-magnet field to replace the wound field. As previously stated, this eliminates both the need for separate field excitation and the electrical losses that typically occur in field windings. Permanent-magnet DC motors, like all other mechanically commutated DC motors, are energized through brushes and a multisegment commutator. While all DC motors operate on the same principles, only PM DC motors have the linear speed torque curves shown in Figure 1-18, making them ideal for closed-loop and variable-speed servomotor applications. These linear characteristics conveniently describe the full range of motor perform-

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DWDM is a technology that transmits multiple data signals using different wavelengths of light through a single fiber. As illustrated in Figure 4-12, incoming optical signals are assigned to specific frequencies within a designated frequency band. The capacity of the fiber is increased when these signals are multiplexed out onto one fiber. The best way to describe DWDM technology is by readdressing the earlier analogy of a car traveling on a highway. The analogy compared the SAN environment and movement of data to one fiber traveling to a multilane highway using one lane. It stated that traditional systems use one lane of the highway. Moving the cars, or signals, faster within the one lane increases the capacity of the highway. DWDM technology accesses the unused lanes, increasing the number of wavelengths on the embedded fiber base and fully using the untapped capacity within the fiber.

Pure logic is no guarantee of a winning argument. Minds tend to be both emotional and rational. Why do people buy what they buy Why do people act the way they do in the marketplace When you ask people why they made a particular purchase, the responses they give are often not very accurate or very useful. That may mean that they really do know, but they are reluctant to tell you the real reason. More often, however, they really don t know precisely what their own motives are. For when it comes to recall, minds tend to remember things that no longer exist. That s why recognition of a well-established brand often stays high over a long period, even if advertising support for that brand is dropped. In the mid-1980s, an awareness study was conducted on blenders. Consumers were asked to recall all the

Figure 1-18 A typical family of speed/torque curves for a permanent-magnet DC servomotor at different voltage inputs, with voltage increasing from left to right (V1 to V5).