Handbook of Precision Engineering: Volume 7 Electrical by A., ed. Davidson
By A., ed. Davidson
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Extra info for Handbook of Precision Engineering: Volume 7 Electrical Design Applications
Their mechanical power output ranges from 0 to 10 or 20 watts. They can be classified according to type in many different ways; for present purposes a distinction will be made between induction motors and commutator motors (with brushes). Designers using motors in precision-engineered equipment need to know what data (specifications) to consider in choosing the correct type of motor. In general terms these data are: Torque at the driven shaft, in g. em. Since the maximum torque developed may depend upon the speed of rotation and/or the voltage or current, a torque/speed, a torque/voltage, or a torque/current curve is given for each type of motor.
Heat losses in the cable ( = J2R,) are determined by the amperage, unless there are some means of 28 HANDBOOK OF PRECISION ENGINEERING reducing the cable resistance, which invariably means a thick-and therefore expensive-cable. On the other hand, there are factors which limit the voltage; high voltages call for high-grade insulation, whose cost must not exceed that of a somewhat thicker conductor. The choice between these two alternatives depends upon the purpose in view: for a continuous transfer of energy, say, in bulk (electricity supply grid), the system of overhead lines, supported on insulators, can be adopted, whereby the need for mechanical strength and the span length impose additional requirements as to the thickness of the conductor.
R-. 12 10 ~ r-. 0 Carbon I~ lAY I II vII 'V I I Values given for each series appear in every decade. 21 Nomogram CR68 C~52 240 160 120 Rrlt1WI400 p CR37 I K~ \'-! ~ • K"~ PHILIPS PHILIPS Resistors Rating system for resistors Carbon film Nomograms to find style or stability Metal film Example What is the stability of a 1 kll metal film resistor, style MR25, operating at 1/3 W in an ambient of 60'C. Take a horizontal line on the nomogram from 1/3 W to where it intersects the 60'C ambient line.