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By Prepared Ken Berringer


The AC induction motor is the workhorse of modern industry. Worldwide about 50 million motors are installed every year that have greater than 1/2 hp. Today only a small percentage of these motors utilize variable speed drives. Almost half of the variable speed AC drives sold today are in the 1 to 5 hp range. Companies producing this range of drives are under a great deal of pressure to reduce costs. Lower system cost will result in higher volumes as more applications use variable speed. The power semiconductors are a significant portion of the cost of these drives. A new module called an Integrated Power Stage may be used to reduce the cost and complexity of the power semiconductors. A functional demo board has been developed using this module for a 1 to 2 hp AC motor drive. INDUCTION MOTOR SYSTEM A systems approach can be taken to reduce the overall cost of an AC drive in the 1 to 3 hp power range. The system can be partitioned by semiconductor technologies and power dissipation requirements. A block diagram of a basic AC drive system is shown in Figure 1

Year: 2011
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