Position Sensorless Control Of Interior Permanent Magnet Synchronous Motors Research Articles

Position sensorless starting method for IPMSMs by all‐pass filters

AbstractThis paper proposes the starting method for position sensorless controlled interior permanent magnet synchronous motors (IPMSMs) by using all‐pass filters. The starting of IPMSM position sensorless control is well known to be extremely difficult due to the lack of electromotive information. Therefore, IPMSM is often started and accelerated with the high‐frequency signal injection in general, and then, the control algorithm is switched to position sensorless control without high‐frequency injection in middle speed region. However, the acoustic noise due to high‐frequency signal injection would occur, and the switching of control methods would cause some bumps. For this reason, IPMSM is desirable to be driven from the start to the steady state without high‐frequency signal injection.This paper realizes to start the position sensorless controlled IPMSM without high‐frequency signal injection by allpass filter with the assistance of the appropriate initial vector setting of each controller, under the assumption that the high‐frequency signal injection is used only at standstill. Finally, this paper experimentally demonstrates the feasibility and the effectiveness of the proposed method.

Position sensorless control of IPMSMs based on a novel flux model suitable for maximum torque control

AbstractIn this paper, a novel position sensorless control method for interior permanent magnet synchronous motors (IPMSMs) that is based on a novel flux model suitable for maximum torque control has been proposed. Maximum torque per ampere (MTPA) control is often utilized for driving IPMSMs with the maximum efficiency. In order to implement this control, generally, the accurate motor parameters are required. However, the inductance varies dramatically because of magnetic saturation, which has been one of the most important problems in recent years. Therefore, the conventional MTPA control method fails to achieve maximum efficiency for IPMSMs because of parameter mismatches. In this paper, first, a novel flux model has been proposed for realizing the position sensorless control of IPMSMs, which is insensitive to Lq. In addition, in this paper it is shown that the proposed flux model can approximately estimate the maximum torque control (MTC) frame, which is a new coordinate aligned with the current vector for MTPA control. Next, in this paper, a precise estimation method for the MTC frame has been proposed. By this method, highly accurate maximum torque control can be achieved. A decoupling control algorithm based on the proposed model is also addressed in this paper. Finally, some experimental results demonstrate the feasibility and effectiveness of the proposed method. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 184(3): 55–66, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.22380

最大トルク制御に適した磁束モデルの提案とこれに基づくIPMSMの位置センサレス制御

In this paper, a novel position sensorless control method for interior permanent magnet synchronous motors (IPMSMs) that is based on a novel flux model suitable for maximum torque control has been proposed. Maximum torque per ampere (MTPA) control is often utilized for driving IPMSMs with the maximum efficiency. In order to implement this control, generally, the accurate motor parameters are required. However, the inductance varies dramatically because of magnetic saturation, which has been one of the most important problems in recent years. Therefore, the conventional MTPA control method fails to achieve maximum efficiency for IPMSMs because of parameter mismatches. In this paper, first, a novel flux model has been proposed for realizing the position sensorless control of IPMSMs, which is insensitive to Lq. In addition, in this paper it is shown that the proposed flux model can approximately estimate the maximum torque control (MTC) frame, which is a new coordinate aligned with the current vector for MTPA control. Next, in this paper, a precise estimation method for the MTC frame has been proposed. By this method, highly accurate maximum torque control can be achieved. A decoupling control algorithm based on the proposed model is also addressed in this paper. Finally, some experimental results demonstrate the feasibility and effectiveness of the proposed method. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 184(3): 55–66, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.22380

IPMSM position sensorless control based on adaptive flux observer using ϵ1‐modification approach

AbstractThis paper proposes a robust‐adaptive scheme for position sensorless control of interior permanent magnet synchronous motors (IPMSMs) using ϵ1‐modification approach. The feasibility and effectiveness of the proposed method is shown by experimental results in low‐speed region. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Robust Position Sensorless Control of IPMSMs for Inductance Variation Using Unknown Input Observer

This paper proposes a new robust position sensorless control of interior permanent magnet synchronous motors (IPMSMs) for inductance variation using an unknown input observer. In position sensorless control of IPMSMs, accurate motor parameters are required for position estimation. However, inductance variation due to magnetic saturation is known to heavily deteriorate the performance of sensorless control. The authors have already proposed the unknown input observer for position sensorless control of IPMSMs. This paper shows that the proposed observer possesses high robustness for magnetic saturation by analyses and experiments.

Position sensorless control for interior permanent magnet synchronous motor using adaptive flux observer with inductance identification

A position sensorless control of interior permanent magnet synchronous motors (IPMSMs) is proposed using the adaptive full-order observer with inductance identification. First, mathematical models are discussed for robustness improvement to inductance variation and inductance identification in IPMSMs, the models show that a high-frequency signal needs to be injected to identify the inductance. Next, novel adaptive schemes for inductance identification are proposed here. Finally, identification experiments under IPMSM position sensorless control are carried out with the proposed methods, in which the feasibility and effectiveness of the methods are shown in terms of inductance identification performance and the convergence of position estimation error.

Design of a robust current controller to position estimation error for positioning of a sensorless control of interior permanent magnet synchronous motors under high‐speed drives

AbstractThis article proposes a new current controller for high‐speed drives in interior permanent magnet synchronous motors (IPMSMs) with position sensorless control. It has been pointed out that the conventional current control systems become unstable under high‐speed drives. First, this article shows that rotor position estimation error causes unstable current control, and this instability is especially emphasized at high speed. To overcome this instability, this article proposes a simple modified controller with 2DOF structure, the design of which is also explained. Stability, using the proposed current controller, is then analyzed theoretically, and the proposed controller can extend the stable region for IPMSM position sensorless control, which is an improvement over conventional systems. © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.