56. RDC

56.1. Overview

The RDC (Resolver-to-Digital Converter) example project demonstrates how to obtain position information from a resolver using the RDC module. The example shows:

  • ADC configuration for I/Q signal sampling

  • PWM and TRGM configuration for ADC triggering

  • RDC module configuration and calibration

  • Angle calculation and output

56.2. Board Setting

Connect the resolver driver board to the motor interface (Please refer to RDC Pin Description), then connect the resolver to the driver board.

  • Driver board 14V power supply

  • RDC model SG52-4-G12.7

  • The resolver has 4 pole pairs, so one electrical revolution corresponds to 1/4 mechanical revolution

  • The initial position of the resolver needs to ensure sufficient voltage in both phases to acquire the zero-crossing position, otherwise position errors may occur during movement

56.3. Running the example

When the example runs successfully, the serial terminal will output the calculated angle information. The program will:

  1. Initialize and calibrate the RDC module

  2. Continuously sample I/Q signals

  3. Calculate and output the angle in degrees

The output will look like:

theta: 1.
theta: 20.5.

Note: The angle value represents the mechanical angle in degrees.