tailieunhanh - Handbook of Small Electric Motors MAZ Part 12

Tham khảo tài liệu 'handbook of small electric motors maz part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 5_ ELECTRONICALLY COMMUTATED MOTORS Chapter Contributors Duane C. Hanselman Dan Jones Douglas W. Jones William H. Yeadon BRUSHLESS DIRECT-CURRENT BLDC MOTORS This chapter covers performance calculations and characteristics of the most common electronically commutated motors. The first motor to be covered is the brushless direct-current BLDC motor in several configurations. Next several configurations of the stepper motor are discussed. This is followed by the switched-reluctance motor which is really a specialized configuration of the variable-reluctance stepper motor. Brushless direct-current motors BLDCs are so named because they have a straight-line speed-torque curve like their mechanically commutated counterparts permanent-magnet direct-current PMDC motors. In PMDC motors the magnets are stationary and the current-carrying coils rotate. Current direction is changed through the mechanical commutation process. In BLDC motors Fig. the magnets rotate and the current-carrying coils are stationary. Current direction is switched by transistors. The timing of the switching sequence is established by some type of rotor-position sensor. A typical rotor assembly for an inner-rotor configuration with sensors and commutation magnet is shown in Fig. . The three white devices mounted on the printed-circuit board are Halleffect switches. They are positioned next to the larger-diameter magnet wheel which causes them to switch high and low as the wheel changes from north to south as it Section contributed by William H. Yeadon Yeadon Engineering Services PC except as noted. CHAPTER FIVE rotates. The angular position of the Hall devices are adjusted to provide the optimum firing angle for the application. Figure shows via magnetic field-viewing film the relative position of the motor magnet transition zone with respect to the Hall device. The stator assembly for this is shown in Fig. . This motor has a low-energy-product solid-plastic .

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