A High-efficiency Resonant Driver and Soft Decoder Interface with Fast-dynamics PLL-Type Angle and Speed Tracking Observer for Resolvers
Alex Musetti, Enrico Panciroli, Hossein Sadegh Lafmejani, Alessandro Soldati · 2023
Reliable and robust sensored motor control demands accurate and consistent measurement of position and speed of the motor shaft. Resolvers are robust and precise analog position transducers that require a sinusoidal excitation voltage with specific amplitude and frequency. Because of that, it is not usually possible to excite the resolver directly from a microcontroller, often used for motor control applications. This paper presents a new resonant, high-efficiency resolver excitation circuit, which guarantees a high-density layout with minimal component usage. The optimization process of the circuit design is presented. The network is coupled with a novel soft fast-dynamics PLL-type angle tracking observer, to extract angle and speed information. Simulation and experimental results demonstrate that the presented interface is effective, showing less than 2% THD and efficiency increase up to 5× (design-dependent) when compared to a traditional class AB driver.