DSP28335 2812 resolver.pdf

Digital Control Systems (DCS) Group 1 Texas Instruments Description This software module calculates the rotor position and motor speed based on two resolver signals (i.e., sin and cos signals). SinIn CosIn pu pu pu pu Q0 SpeedRpm Speed aOutputThet RESOLVER Availability This IQ module is available in one interface format: 1) The C interface version Module Properties Type: Target Independent, Application Dependent Target Devices: x281x or x280x C Version File Names: resolver.c, resolver.h IQmath library files for C: IQmathLib.h, IQmath.lib Item C version Comments Code Size□ (x281x/x280x) 877/877 words Data RAM 0 words? xDAIS ready No XDAIS component No IALG layer not implemented Multiple instances Yes Reentrancy Yes ? Each pre-initialized “_iq” RESOLVER structure consumes 157 words in the data memory □ Code size mentioned here is the size of the calc() function Position and Speed Calculations for Resolver SensorRESOLVER Digital Control Systems (DCS) Group 2 Texas Instruments C Interface C Interface Object Definition The structure of RESOLVER object is defined by following structure definition typedef struct { _iq SinIn; // Input: Measured sine signal (pu) _iq CosIn; // Input: Measured cos signal (pu) _iq FilteredSin; // Variable: Filtered sine signal (pu) _iq FilteredCos; // Variable: Filtered cos signal (pu) _iq DemodSin; // Variable: Demodulated sine signal (pu) _iq DemodCos; // Variable: Demodulated cos signal (pu) _iq PreviousSin[18]; // History: Past sine signals (pu) _iq PreviousCos[18]; // History: Past cos signals (pu) _iq FilterGain[18]; // Parameter: FIR 17-order low-pass, Hamming Windows _iq OutputTheta; // Output: Motor electrical position angle (pu) _iq FilterThe