By Heinz P Bloch; Claire Soares
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Example text
The motor then always operates between the breakdown torque point and the synchronous speed point that corresponds to the 1800 RPM location on the horizontal axis. If additional load torque is required, the motor slows down and develops more torque by moving up toward the breakdown torque point. Conversely, if less torque is required, the motor would speed up slightly toward the 1800 RPM point. Again, if the breakdown torque requirements were exceeded, the motor would stall. Figure 1-17 depicts the same motor speed-torque curve, but now the motor current has been shown for full voltage starting.
Although none of these special forms differ materially in tooth action from the usual spur gears, it may be beneficial to mention some of them that are sometimes found in special applications. A spur gear meshing with a straight element (Figure 2-4) is known as a rack and pinion. The rack may be visualized as a short section of an infinitely large spur gear; a gear so large in diameter that the teeth lie on a straight line. Elliptical gears (Figure 2-6) are used to convert the uniform rotary motion of a driving shaft to a rhythmic, pulsating rotation of the driven shaft.
Worm Gears Where the driving gear of a helical right angle drive is much smaller in diameter than the driven gear, the combination could be called a nonthroated worm gear set (Figure 2-20), the smaller gear being the worm. Worm length, as compared with FIGURE 2-19 Spiral gearing used in certain right-angle drives. ) 38 Process Plant Machinery @ (" 0 FIGURE 2-20 Nonthroated worm gear set. The teeth are straight and do not envelop the worm. ) diameter, permits the helical teeth to encircle the shaft more than once, thus giving the teeth the appearance of threads and giving the worm the appearance of a screw.