Description: The terms 'energy-saving' and 'quiet-running' are becoming very important in the world of variable speed motor drives. Inverter technology is being accepted by a wide range of users in the design of these products, and their use is increasing. For low-power motor control, there are increasing demands for compactness, built-in control, and lower overall-cost. An important consideration, in justifying the use of inverters in these applications, is to optimize the total-cost-performance ratio of the overall drive system. In other words, the systems have to be less noisy, more efficient, smaller and lighter, more advanced in function and more accurate in control with a very low cost.