Error analysis and compensation of multipole resolvers

Abstract

The signal errors of the multipole resolver and the measurement error incurred due to the signal errors are analysed, and expressions for the errors are determined. Based on the results of the analysis, a compensation method utilizing an analogue circuit for the measurement error is presented. The zero-position error and the amplitude error of the 34-pole resolver are compensated using the compensation circuit presented. The measurement accuracy of the 34-pole resolver is improved significantly from about 15 to 2 min. The correctness of the analysis result and the effectiveness of the compensation method are also verified.

Proposal of Improved Winding Method for VR Resolver

“…If the source signal has a sinusoidal E source with frequency ω and time variation, the output signals are induced sinusoidal functions of the electrical angle of the rotor position. The source signal voltage E source and output signal voltages, E out_1 and E out_2 , at the stator terminals are, respectively [5], [6] …”

“…When the output signals expressed in (2), pass through the resolver-to-digital (R/D) converter, the absolute position can be obtained [6]. Equation (3) shows the output signals passed through the R/D converter.…”

Inductive and Magnetic Sensors

“…[49], together with a compensation method to reduce errors. Measurement frequencies are around 10 kHz.…”

Error analysis and compensation for inductosyn-based position measuring system

“…The method for improving the accuracy of a low-cost, resolver-based shaft encoder reported in [6] has been proved effective. An analogue compensation circuit has been presented in [7] to improve the measurement accuracy of resolver. However, the method presented in [5] eliminates the harmonics with increasing the cost and complexity of the transducers.…”

“…The 'look-up' table in [6] must be carefully calibrated in advance, or else the discrepancy between the table's error and the real one will cause larger measurement error. The ways to eliminate amplitude imbalance and quadrature error, proposed whether in [5] or in [7], have difficulty in tuning parameters of the analogue circuits due to the small signal error. Now, the digital control has been widely used in the precise position servo system.…”