Abstract
Control of permanent magnet synchronous machines (PMSMs) requires absolute rotor position measurement/estimation, as well as the magnet polarity detection for the machine start-up, encoders/resolvers being normally used for this purpose. However, these sensors can account for a large portion of the overall drive cost, and require additional room and cabling, therefore penalizing the size and reliability of the drive. This article proposes a method to emulate a resolver in machines using low cost Hall-effect sensors. The proposed Hall-effect resolver system is a new type of angular position sensor for PMSMs. This allows to control machines which do not include a resolver from inverters which require a resolver signal to operate.
Highlights
Permanent magnet synchronous machines (PMSMs) have become very popular during the last decades due to their high efficiency, high power density and superior dynamic response compared with other types of machines, e.g. induction, wound field or synchronous reluctance machines
This paper proposes a method to emulate resolvers using the signals provided by low-cost Hall-effect sensors, HER, which is an extension of [28]
Commercial resolvers can be classified into wound field (WF) [16]-[19] and variable reluctance (VR) [20]-[21]
Summary
Permanent magnet synchronous machines (PMSMs) have become very popular during the last decades due to their high efficiency, high power density and superior dynamic response compared with other types of machines, e.g. induction, wound field or synchronous reluctance machines. Control of PMSMs requires the absolute position of the rotor, i.e. including magnet polarity prior to startup of the machine [1]-[2]. Both absolute encoders [3]-[6] and resolvers [16]-[22] comply with this requirement. A planar angular position sensor is proposed in [23], with a similar working principle as a variable reluctance resolver This sensor is highly sensitive to electromagnetic interference due to its construction and requires and additional electronic circuit to operate.
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