Investigation of Novel Doubly Salient PM Variable Reluctance Resolvers

Qiang Li,Wei Sun,Jian Yu,Xuefeng Jiang,Weiwei Geng,Da Xu,Le Sun

doi:10.1109/access.2019.2931933

Qiang Li, Wei Sun + Show 5 more

Open Access

https://doi.org/10.1109/access.2019.2931933

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Journal: IEEE Access	Publication Date: Jan 1, 2019
Citations: 17	License type: CC BY 4.0

Affiliation: Nanjing University of Science and Technology

Abstract

As rotor position sensors, the variable reluctance (VR) resolvers are playing critical roles in the industrial electric machine drivers. The VR resolvers have a simple structure, therefore, they are reliable and durable under rough operation scenarios. However, the dedicated decoding system requires the voltage signal injection with high-frequency (HF), which must be much higher than the machine operation frequency. The HF injection increases the decoding computation and system cost, especially for the high-speed applications. To avoid applying the HF injection, this paper proposes a new category of VR resolvers by adopting the concept of the doubly salient permanent magnet (PM) motor. The doubly salient PM machines have the magnets and windings on the stator side, thus, they can keep simple and reliable rotors as the VR resolvers. A significant benefit is that the stator-PM can produce back-EMF, which provides the rotor position information. By this way, the HF injection-based VR resolver solution is only serving for low-speeds and can be shut down as long as the PM back-EMF can be detected by the analog circuit. Besides, the proposed linear counterpart is also a novel option for the mover position sensor in the high speed and long distance linear drive system. The modeled examples are analyzed by finite-element analysis (FEA).

Highlights

With simple rotor structure, the variable reluctance (VR) resolver is worldwide popular in the high speed electric machine drive systems [1], [2]
In the hybrid electric vehicle/electric vehicle (HEV/EV) powertrain, the drive motors are usually operating at high-speeds
This paper proposes a novel linear variable reluctance (LVR) resolver by using the concept of the doubly salient permanent magnet (PM) linear motor, in which the magnets and windings are both on the mover and the rail structure is simple and low-cost

Summary

INTRODUCTION

The variable reluctance (VR) resolver is worldwide popular in the high speed electric machine drive systems [1], [2]. This paper proposes a novel linear variable reluctance (LVR) resolver by using the concept of the doubly salient PM linear motor, in which the magnets and windings are both on the mover and the rail (long stator) structure is simple and low-cost. This novel LVR resolver is a two-phase doubly salient PM linear motor, providing two-phase orthogonal back-EMF. NOVEL VR RESOLVER WITH ODD POLES The proposed doubly salient VR resolver presents a solution for the high-speed position measurement by the PM backEMF, without requiring any HF injection and demodulation decoding procedures. The pre-transformation can make them become two orthogonal signals, i.e

NOVEL LINEAR VR RESOLVER

FINITE ELEMENT ANALYSIS AND VALIDATION

CONCLUSION