Introduction of multi-motor control scheme based on Microchip dsPIC33CH series

This solution is designed based on Microchip's dsPIC33CH dual-core DSC digital signal controller chip, which can bring good news to developers of high-end embedded control applications. One of the two cores of the dsPIC33CH in this design is the primary core and the other is the secondary core.

The secondary core can be used to execute time-critical dedicated control codes, and the main core is responsible for running the user interface, system monitoring and communication functions, and is tailored for terminal applications.Microchip has also specially designed the dsPIC33CH to allow different design teams to develop code for each core separately and seamlessly integrate the two cores into one chip.

When the secondary core of dsPIC33CH is dedicated to motor control, it can drive up to two brushless motors at the same time. In addition to communication, system monitoring, interface display and diagnosis, the main core can also drive a brushless motor.Compared with traditional motor control solutions, the motor control scheme based on dsPIC33CH device design has the following advantages:

● Faster instruction execution speed

● Faster interrupt response speed

● Can drive more brushless motors at the same time

● High integration reduces PCB size

● Make control more efficient and design flexibleProduct application block diagram:

Main control chip block diagram:

Program features:

● Control method: FOC sinusoidal control

● Starting method: no Hall

● Control algorithm: SMO (refer to Microchip AN1078)

● Modulation method: SVPWM

● Protection function: over current, under voltage, over voltage, over temperature protection, etc.

● Communication: Support RS485 / CAN

● Main features: fast and reliable startup, good dynamic performance, high efficiency and low noise

● Support driving 2-3 brushless motors at the same timeTarget application:

● Smart dishwasher, range hood, etc.