This white paper presents a method to measure the position provided by a resolver by means of a proper demodulation method.
The resolver is an electrical machine that is intensively used in synchronous motor drives to measure the rotor position that is needed for the motor control algorithm. Due to its robustness, the resolver is the popular choice in harsh environments, where the electrical motor is subjected to mechanical stresses and vibrations, such as automotive and aerospace applications. The measured position is usually obtained through a resolver-to-digital converter that implements in a single chip several blocks, such as a signal demodulator, a voltage-controlled oscillator and a tracking loop. This work presents a method to obtain the position measured by a resolver using the high-speed voltage acquisition channels of HBM Genesis HighSpeed data recorders, with no requirement of additional hardware.