Study and implementation of sensorless speed control of interior permanent magnet motor from zero to very high speed

Abstract

The paper proposes an implementation of a motion sensorless control system in a very wide speed range -from zero speed operation, based on direct and quadrature inductance components of the stator flux linkage for the interior permanent magnet synchronous motor-IPMSM, without signal injection. The proposed observer is developed using the Lyapunov design, resulting a scheme with a full observer for the motor states. The observer assures stability even for zero speed. The proposed observer can be applied to other types of synchronous machines such as surface permanent magnet synchronous motor-SPMSM, dc. excitation SM, variable reluctance synchronous motor-VRSM or transverse-flux motors-TFMs. Extensive experimental results are presented to verify the principles and to demonstrate the effectiveness of the proposed sensorless control system. With the so-called by the authors-the "stator flux linkage d-q inductances components observer", the IPMSM vector controlled drive system operates from zero to the maximum speed of more then six times the rated speed-on the flux weakening region. The experiments were conducted on 2.7kW IPMSM which is vector controlled by a floating-point TMS320C6713-Digital Signal Processor. The results prove very good dynamic performances in all ranges of speed and torque operation.

Simplified Quadratic Optimization-Based IPMSM Full-Speed Range Rotor Position Estimation in Synchronous Rotating Frame

“…The most commonly used one is the sinusoidal signal. However, if sinusoidal signal is used, îd (k) will become îd (k) = Acos(ω h t) (25) where A is the amplitude of the injection current and ω h is the angular speed of the high-frequency signal. According to (25), îd (k) will be zero at some point (ω h t = pi /2 + N pi, N =, ±1, ±2, .…”

“…Unified position estimation methods have been proposed to tackle the aforementioned method switching problem for IPMSM control in the full-speed range [23], [25]- [29]. These methods utilize a unified voltage model [23], [27], [28] or flux model [25], [26] in the full-speed range. No estimation method switching is needed during speed variation.…”

“…No estimation method switching is needed during speed variation. In [25], a flux observer is designed to observe the rotor flux, only the difference between the estimated rotor flux and the known permanent magnet (PM) flux is fed back to correct the estimation, the estimation accuracy is limited. In [26], the flux observer is designed in a quadratic form, and more prior knowledge and limits are applied; therefore, the estimation results are more accurate.…”

“…However, the solving process is complex and time-consuming. Wang et al [24] and Peng et al [25] propose a method to simplify the process to solve the optimization problem in the stationary frame. The rotor position is obtained at first from the solution.…”

A Comparison Research on Sliding Mode Observation Methods for SPMSM in Sensorless Environment of Medium-to-High Speed

“…In medium-to-high speed operation mode, the effective signal-to-noise ratio (SNR) control of the motor for electric vehicle has a very high requirement. In order to achieve the optimal efficiency mode with the high SNR and high torque ripple under the vector control [5], the control algorithm and initial position estimation for detecting rotor angle under medium-to-high speed operation mode of PMSM have become the focus of current research. The sensorless control technology of PMSM is based on the mathematical model of KIPPO subjected to the back electromotive force for motor to detect the rotor position and speed information.…”