Brushless DC Motor Control

This solution supports 3-phase brushless DC (BLDC) motors and permanent magnet synchronous motors (PMSM). Both sensored (Hall effect) and sensorless configurations are supported. The FOC algorithm works best with PMSM motors having sinusoidal back-EMF, while trapezoidal BLDC motors can use six-step commutation. Supported motor parameters: 4-16 pole pairs, 0.1-10A rated current, 100-15,000 RPM operating range. For motors outside these specifications, contact our FAE team for customization guidance. The software includes motor parameter auto-detection to simplify setup with different motors.

Works with BLDC and PMSM motors; FOC recommended for PMSM, six-step for trapezoidal BLDC.

Use the Motor Control Tuning GUI included with MPLAB X: 1) Connect the board and run the motor parameter measurement tool to automatically identify Rs, Ld, Lq, and Ke

2) Set current loop PI gains starting with Kp=10, Ki=100 and adjust based on step response

3) Set speed loop gains with Kp=0.1, Ki=1 and tune for desired transient response

4) Configure the sensorless observer parameters based on motor inertia and load characteristics

5) Use the real-time scope to verify current waveforms are sinusoidal. The GUI provides automated tuning wizards for common motor types. For custom motors, our FAE team can provide tuning support and parameter optimization.

Use automated parameter measurement; start with conservative gains and increase gradually while monitoring stability.

The solution includes comprehensive safety features: 1) Hardware overcurrent protection via analog comparator with <1μs response time

2) Overvoltage protection with automatic PWM shutdown

3) Undervoltage lockout prevents operation with insufficient bus voltage

4) Thermal monitoring with programmable derating and shutdown thresholds

5) Watchdog timer ensures software integrity

6) Fault diagnostic output via CAN bus

7) Safe state configuration (all gates off) on fault detection. For functional safety applications (ISO 13849, IEC 61800), the dsPIC33CK supports dual-core lockstep operation and ECC memory. Contact our functional safety team for safety manual and FMEDA documentation.

Hardware protection <1μs response; contact FAE for functional safety certification support.

The standard reference design supports up to 48V DC bus voltage suitable for low-voltage industrial and EV applications. For high-voltage applications (110V, 220V, or 400V AC), significant modifications are required: 1) Replace gate driver with high-voltage isolated drivers

2) Use high-voltage MOSFETs or IGBTs rated for the DC bus voltage

3) Implement isolated current sensing

4) Add input filtering and PFC front-end for AC supply

5) Ensure adequate creepage and clearance distances on PCB. Microchip offers reference designs for 400V motor drives using the same dsPIC33CK controller. Contact our FAE team for high-voltage motor control solutions.

Standard design up to 48V; contact FAE for high-voltage (110V-400V) motor control solutions.

The solution includes CAN 2.0B interface using the MCP2562 transceiver. For industrial automation, implement CANopen or Modbus protocols on top of the CAN physical layer. The dsPIC33CK includes dedicated CAN controller with 32 message buffers. For Ethernet-based networks, add the LAN8740 PHY and implement EtherCAT or PROFINET using the dsPIC33CK's high-speed PWM and capture modules. The software stack includes example implementations of common industrial protocols. For integration with PLCs, map motor control parameters (speed, torque, status) to standard process data objects. Our FAE team can provide protocol stack integration support.

CAN interface included; contact FAE for EtherCAT, PROFINET, or custom protocol implementation.