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15 When designing BLDC motor applications, you must have specific applications and individual use cases in mind. For example, motor designs for vacuums, dishwashers, and refrigerators are all different, and even different products within a single product line can have different motor control requirements. The important questions to ask are the same as those you ask for brushed DC motor design; the answers are just different. By way of example, suppose you are designing a motor for a washing machine. You begin by considering the required motor functions and the load, which would be approximately 3 to 5 kilograms (kg) but may be as much as 11 kg. Based on this estimate, the power requirements would be 1.5 to 2.5 kilowatts (kW) but may be as high as 3.5 kW. From there, you consider the power switches, first choosing between discrete and integrated power options. Then you determine the characteristics of the power switches with regard to on-resistance, slew rate control, overcurrent and overvoltage protection, and reverse current blocking. Metal oxide semiconductor field-effect transistors might be an option, but you would likely use insulated gate bipolar transistors (IGBTs) in this example because of loads that could require 15 amps or more. IGBTs also enable low switching loss and simpler design. Motor Application Design There's always a tradeoff between power consumption, connectivity range, run time, and size. Dev Mandya Staff Product Marketing Manager, Renesas Electronics Chapter Three Chapter Three: Motor Application Design "One of the ways to approach BLDC motor driver design is by understanding the main output of the system— e.g., cost, efficiency, and so on. After these objectives are completely clear and defined, the technical solutions start to come more easily." Pyter Ely da Silva Hardware Engineer, Whirlpool Corporation