123 Dc Brushless Essay

898 WordsFeb 13, 20124 Pages
Texas Instruments Brushless DC Motor Control Solutions TI offers a complete solution for your Brushless DC Motor Control Solutions. TI offers microcontrollers, gate drivers, isolation, industrial interface and power management. Design Considerations The brushless DC motor has stator windings and permanent magnets on the rotor. The windings are connected to the control electronics and there are no brushes and commutators inside the motor. The electronics energize the proper windings similar to a commutator; the windings are energized in a moving pattern that rotates around the stator. The energized stator windings lead the rotor magnet. BLDC motors are more efficient, run faster and quieter, and require electronics to control the rotating field. BLDC motors are also cheaper to manufacture and easy to maintain. Three-phase inverters are required to drive BLDC motors. The inverter consists of three half H-bridges, where upper and lower switches are controlled using complementary signals. It is important to keep a delay between high-side switch turn off and low-side switch turn on. This will eliminate a potential short across the switches Microcontrollers TI's C2000™ family of MCUs can control BLDC motors using either scalar or vector-control techniques. Knowledge of rotor position is important for efficient control of a BLDC motor. The rotor position can be detected by hall sensors or rotary encoders attached to the motor. These sensor inputs are used in a sensored feedback control system. Rotor position can also be estimated by using back emf voltage information. This mode of feedback control eliminates the need for sensors and additional wires. Position or speed estimators can also be used to calculate rotor position. Integrated high-speed 12-bit ADC converters, high-resolution pulse-width modulators (PWMs) and a quadrature encoder input (QEI) on C2000 MCUs make

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