If the specification calls for the acceleration of the load to be maximized, it turnsout that the optimum gear ratio is that which causes the referred inertia of the loadto be equal to the inertia of the motor. Applications in which load acceleration isimportant include all types of positioning drives, e.g. in machine tools andphototypesetting. This explains why brushless permanent magnet synchronousmotors, discussed in Chapter 9, are available from a wide range of manufacturerswith different inertias. (There is an electrical parallel here – to get the most powerinto a load from a source with internal resistance R, the load resistance must bemade equal to R.)
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