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The rst step in the drive selection process is to understand the application-driven speci cations, that is, issues such as the type of motion, duty cycle, the required acceleration and gearing system, and the type of control that may be required (position, velocity, torque)
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The second step in the drive selection process concerns the sizing of the motor itself This is done by rst calculating the maximum speed; next, the re ected inertia of the load and drive components is calculated, as discussed earlier in this section From the inertia calculations, the peak torque required by the application can be calculated The maximum speed and torque requirements thus obtained will narrow the eld signi cantly Next, one should determine the appropriate constants for each of the candidate motors; these include, in general, inertias, resistances (electrical and thermal), and torque and back emf constants With these constants it becomes possible to determine that the motor can operate within its thermal speci cations by calculating the temperature rise of the machine in operation This, of course, can be a greater limitation during certain portions of the motion cycle for example, during a hard acceleration
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This step involves calculating peak voltage and current, to determine the supply requirements
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Although we have been assuming that the mechanical drive system was known beforehand, so that the re ected inertia and peak torque could be calculated, there are many issues that need to be investigated in establishing the drive system for example, the effect that elastic couplings might have in creating mechanical resonances; noise and vibration characteristics; and backlash due to gearing system imperfections It should be apparent from this brief discussion that the process of selecting an electromechanical drive is quite complex, and that it requires a good understanding of many aspects of engineering, including heat transfer, kinematics, dynamics, electronics, systems, and, of course, electromechanics We hope that this brief introduction will provide the motivation to pursue further studies in this exciting area of engineering
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CONCLUSION
The most common engineering applications of electric motors make use of a number of special-purpose motors, with operating characteristics that may be derived from the fundamental principles presented in s 16 and 17 The brushless DC motor is a PM synchronous motor in which the mechanical commutation of conventional DC motors is replaced by electronic commutation Brushless DC motors can be made quite compact and nd application in electric vehicle propulsion and motion control Stepping motors of the variable-reluctance, PM, or hybrid type permit ne angular displacement control by moving in xed, discrete steps Typical applications are in robotics and control systems Switched reluctance machines are gaining more widespread acceptance because of their simplicity, since they require no permanent magnets and very simple stator windings Candidate applications for SR machines are low-cost industrial uses and vehicular propulsion The universal motor is very similar in construction to a series DC motor but can operate on AC supplies; its speed can be controlled by means of electronic circuitry of modest complexity Thus, the universal motor nds common application in both variable- and xed-speed appliances, such as power drills and vacuum cleaners, respectively Squirrel-cage induction motors can be operated on a single-phase AC supply if a means is provided for establishing a starting torque Various techniques are commonly employed, such as split-phase, capacitor-start, and shaded-pole construction The different types are characterized by differing torque-speed characteristics that make the single-phase induction motor a very versatile device This is the most commonly employed electric machine
ANSWERS TO CHECK YOUR UNDERSTANDING
CYU 182 CYU 183 CYU 186 T = 107 N-m T = 1509 oz-in = 20
Part III
Electromechanics
CYU 187
Input pulse 1 SA SB SC SD 0 1 0 1 0 1 0
CYU 188
Input pulse Phase A Phase B Phase A Phase B
CYU 189 CYU 1811
29875 lb-in
V Iaux Imain t
Iaux
V I Imain
CYU 1812
(a) Zero, without a start winding; (b) n = (1 s)ns , where ns = 120f/p and s = slip (determined by shaft load)
HOMEWORK PROBLEMS
Section 1: Brushless DC Motors 181 It is found that m = 01 V-s for a permanent
magnet six-pole two-phase synchronous machine Calculate the amplitude (peak value) of the open-circuit phase voltage measured when the rotor is turned at 60 rev/sec open-circuit voltage across one of the phases is 50 V rms a Calculate b The mechanical source is removed and the following voltages are applied: Va = 2 25 cos , Vb = 2 25 sin where = e t Calculate the no-load rotor speed in rad/s
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