tailieunhanh - 8-bit ARM Microcontrollers

Document "8-bit ARM Microcontrollers" give you the knowledge AVR452 Sensor-based Control of Three Phase Brushless DC Motors Using AT90CAN128/64/32: Theory of Operation, Operation of Fundamental BLDC Motor, Implementation, Hall sensor based control of BLDC motor,. | AVR452 Sensor-based Control of Three Phase Brushless DC Motors Using AT90CAN128 64 32 iĩiìel 1. Features Less than 3ps response time on Hall sensor output change Theoretical maximum of 3478K RPM Electrical RPM Support for closed loop regulation over current stall and overload detection. CAN UART TWI and SPI available for communication 2. Introduction The use of Brushless DC BLDC motors is continuously increasing. The reason is obvious BLDC motors have a good weight size to power ratio have excellent acceleration performance requires little or no maintenance and generates less acoustic and electrical noise than universal brushed DC motors. In a Universal DC motor brushes control the commutation by physically connecting the coils at the correct moment. In BLDC motors the commutation is controlled by electronics. The electronics can either have position sensor inputs that provide information about when to commutate or use the Back Electromotive Force generated in the coils. Position sensors are most often used in applications where the starting torque varies greatly or where a high initial torque is required. Position sensors are also often used in applications where the motor is used for positioning. Sensorless BLDC control is often used when the initial torque does not vary much and where position control is not in focus . in fans. This application note described the control of a BLDC motor with Hall effect position sensors referred to simply as Hall sensors . The implementation includes both direction and open loop speed control. 8-bit AV Microcontrollers Application Note 7616A-AVR-03 06 JIM 4ỊỊỊỊẸL Figure 2-1. AT90CAN128 controlling a BLDC motor with Hall sensors Driver Stage 3. Theory of Operation Control of a BLDC motor with position sensors can be implemented on sufficiently powerful microcontroller featuring basic hardware peripherals such as Analog to Digital Converter ADC and a timer with PWM output. The Atmel AT90CAN128 covers the requirements for BLDC .