A novel method for estimating the angle from analog co-sinusoidal quadrature signals

A Novel Linearization Method of Sin/Cos Sensor Signals Used for Angular Position Determination

“…Increasing the resolution of the first A/D converter results with higher linearity, but in that case the influence of the quantization noise becomes more expressed, making it necessary to increase the resolution of the second A/D converter. [rad] (0.0172°) achieved by the method proposed in this paper can be compared with corresponding result obtained in the paper [6], where linearity error of 0.028° is achieved, and with corresponding result from paper [2], where the theoretical linearity of 0.011° is achieved using special and expensive nonlinear integrated circuit as analog multiplier. As the proposed method determines the input angle x based on sin(x) sensor signal, it should be noticed that the final error of this measurement can not be less than the residual nonlinearity that remains after all processing is done.…”

“…There are linear position sensors based on Hall effect that, in a pair, generate sin/cos signals [1]. In comparison to resolvers, which require an excitation signal of an order of a couple of kHz [2][3][4][5][6], the rotary encoders and the sensors based on Hall effect do not need this signal to work properly. In this paper, a special attention will be devoted to processing of the sin/cos signals generated by the sensors with no excitation signal.…”

“…By modifying and combining the sin/cos signals, a pseudo-linear signal can be obtained and further processed towards determination of the angular position [2,[4][5][6]. As it was done in [4,5], the pseudo-linear signal is obtained by combining those segments of the sin/cos signals that are characterized by a satisfying linearity.…”

“…The method we propose in this paper can be used, without any modifications, for processing of the resolver output signals after they are demodulated. In papers [2,[4][5][6] a several angular position determination methods, based on the resolver application, are proposed. These methods do not include A/D conversion, i.e.…”

A New Technique for Analysis of Static Eccentricity in Axial Flux Resolver

“…The most famous absolute position sensors are resolvers and optical absolute encoders [1][2][3]. Comparing with optical absolute encoders, resolvers are more mechanically reliable and can easily be integrated with motor systems [4].…”