Analysis of Novel Variable Reluctance Resolver with Asymmetric Teeth on the Stator

Chengjun Liu,Meng Zhao,Ming Qi

doi:10.1155/2013/958747

Chengjun Liu, Meng Zhao + Show 1 more

Open Access

https://doi.org/10.1155/2013/958747

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Abstract

The variable reluctance (VR) resolver is usually used to measure the shaft angle of motor. A novel VR resolver with asymmetric teeth on the stator is proposed to achieve the minimal number of active teeth and eliminate the amplitude imbalance of the output voltages of SIN and COS coils by bringing the fifth compensating tooth. The structure and the total output voltages of signal windings are explicated theoretically in detail. The topology of such a machine just requires 2D finite element analysis (FEA) to accurately predict the machine performance. Results of FEA and principle of VR resolver with asymmetric teeth are in good agreement, and several special relevant problems are studied. Finally, experimental results validate the theoretical analysis and FEA of the proposed VR resolver.

Highlights

When vector control, direct torque control, and other control strategies are applied in AC governor system with high dynamic performance, the rotor angular position is required necessarily [1,2,3,4]
The novel variable reluctance (VR) resolver has concentrated windings used for SIN and COS coils and rotor with several salient poles to induce voltages containing the information of the rotor angle [14,15,16]
The prototype and test bench are developed based on the analysis and computation results above; the performance of VR resolver with asymmetric teeth is investigated in Section 4, including the output voltages of signal windings and zero-error

Summary

Introduction

Direct torque control, and other control strategies are applied in AC governor system with high dynamic performance, the rotor angular position is required necessarily [1,2,3,4]. The novel VR resolver has concentrated windings used for SIN and COS coils and rotor with several salient poles to induce voltages containing the information of the rotor angle [14,15,16]. A novel VR resolver with asymmetric teeth on the stator, which has a minimal number of active teeth and the simplest structure, is proposed to reduce the size and cost of the device while simplifying its construction without loss of accuracy. The prototype and test bench are developed based on the analysis and computation results above; the performance of VR resolver with asymmetric teeth is investigated, including the output voltages of signal windings and zero-error.

Principle of Novel VR Resolver with Asymmetric Teeth on the Stator

Finite Element Analysis

Experiment and Error Analysis

Conclusions