New Fast-Tracking Vector Control of Permanent-Magnet Synchronous Motors with a Rough Resolution Hall-Effect Position Sensor

Abstract

This paper proposes a new fast-tracking vector control method for permanent-magnet synchronous motors (PMSMs) equipped with a set of three Hall-effect sensor (HES) elements. Vector control for PMSMs requires precise rotor position information, which is acquired from high-resolution position sensors mounted on the rotor such as an encoder and a resolver. However, these sensors have several drawbacks in terms of cost, volume, reliability etc. An HES, which provides very rough position information with a 30-degree error, is a possible candidate to overcome the drawbacks. This paper proposes a new method that can synthesize position information with sufficient precision for vector control from an HES signal. The proposed method, which is established based on the “high-frequency integral-type PLL method”, allows the control system to track a varying command of angular acceleration 500rad/s².