Resolver Emulation for PMSMs Using Low Cost Hall Effect Sensors

Abstract

Control of permanent magnet synchronous machines (PMSMs) requires rotor position measurement/estimation, as well as the magnet polarity detection for startup of the machine. The rotor position of PMSMs is typically measured using a position sensor, encoders/resolvers are commonly used, which are expensive and require additional room and cabling, therefore penalizing cost, size and reliability of the drive. This paper proposes a method to emulate a resolver using low cost Hall-effect sensor. The proposed method enables the use of machines that do not include a resolver, with electric drives, which require a resolver signal to operate. 1