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2 Theoretical Treatment Of Component Elements
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Published:December 1993
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Abstract
We presented a general outline of the ultrasonic motor in the previous chapter. In this chapter, we shall study the basic principles governing the action of each component of a motor to develop an overall theory of the ultrasonic motor in later chapters. In a social context, ‘friction’ denotes something undesirable, such as ‘trade friction’ or ‘friction among people’. However, mechanical friction is not only desirable but indispensable to us. For instance, friction between rubber tyres and the road surface allows an automobile to run. Similarly, friction between steel surfaces enables a train to travel fast. If friction and gravity did not exist, we would not be able to walk.
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