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

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]

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Summary

Introduction

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.

Resolver design and principles of operation
Emulation of a resolver using Hall-effect sensors
Experimental test bench
Experimental results
Operation at variable speed
Conclusions
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