Position Sensorless Control of Synchronous Reluctance Machines Based on Magnetic Saturation Depending on Current Phase Angles

The Impact of the Control Strategy in Flux Observer Based Sensorless Control of Synchronous Reluctance Motors

“…To improve the accuracy of the estimation, especially at low-speed operation, FE mapped flux model [21], or self-commissioning techniques [22], [23] can be used. Kojima et al in [24] introduce a correction factor that takes into account the machine saturation and a torque-dependent gain to correct the position error.…”

A Highly-efficiency Position Sensorless Electric Vehicle Synchronous Reluctance Motor Drive

“…The inherent time delay of LPFs limits the dynamic performances of the current and speed loops. To overcome these difficulties, the square-wave HFI sensorless schemes have been proposed [28][29][30][31][32][33]. By increasing the injection frequency, the effect of slot harmonics can be reduced, and fixed-frequency injection can be adopted.…”

“…The number of LPFs used in the estimation scheme is reduced, and thus the bandwidths of the current, speed, and position estimation schemes are improved. In recent studies [32,33], the problem of instability under heavy loads has been pointed out, and to address it, improved squarewave HFI schemes have been proposed in order to enhance the performance of the motor under heavy load. However, only the ones at low speed are treated.…”

SPMSMs HFI Based Self-Sensing Using Intentional Magnetic Saturation

“…Saturation and cross-saturation effects and self-sensing control strategies have been investigated in depth for interior permanent magnet synchronous machines (IPMSMs). In [9][10] [11] [12] inductance ellipse variation under load condition is analyzed for IPMSMs. Orientation and eccentricity of the inductance ellipse have been shown to vary depending on the dq-axes current level; the orientation of the ellipse has been shown to depend on the cross saturation, while the eccentricity of the ellipse has been shown to depend on the inductive saliency between d-and q-axes.…”

“…In [10], self-sensing performance is improved by decoupling the cross-saturation effect under loaded conditions. In [11] [12], HF is injected in tilted phase angle to improve the self-sensing performance of an IPMSM while operating the machine near the maximum torque per ampere (MTPA) trajectory. In [9][10] [11] [12], additional efforts based on offline characterization of saturation and crosssaturation have been made to enhance the self-sensing performance of PMSMs.…”