Sensorless Control of AC Motors

目前，商用变速驱动器需要轴上安装的速度传感器才能在零速和低速下准确运行。如果不使用速度传感器，驱动器在零速和低速时的运行情况会显著恶化。EPSRC Grant EP/D069017/1研究了一种用于变速交流电机驱动的无传感器控制新技术。该技术可以精确控制电机的速度、位置和负载，即使在零速和极低转速下，也不需要安装在轴上的速度传感器。该建议中描述的工作的目的是证明这种新技术具有足够的灵活性和健壮性，足以增强和提升商用变速电机驱动的性能。具体目标是确保该技术可以应用于各种不同的交流电机(来自不同电机制造商)，并确保逆变器可以在适当的情况下自动设置其控制参数。这种即插即用、高性能的无传感器控制将允许逆变器用于各种新的应用和广泛的额定功率。在潜在的许可方愿意投资这项技术之前，关键是要证明它可以在任何交流电机的即插即用模式下使用。这一后续基金的一揽子技术工作将证明这一点，从而使成功的商业化成为可能。

At present, commercial variable speed drives require a shaft mounted speed sensor to operate accurately at zero and low speeds. The operation of the drive at zero and low speeds deteriorates significantly if no speed sensor is used. A new technique for sensorless control of variable speed ac motor drives has been researched in EPSRC Grant EP/D069017/1. The technique provides accurate control of motor speed, position and load, even at zero and very low speeds, without the need for a shaft mounted speed sensor.The aim of the work described in this proposal is to demonstrate that this new technique is flexible and robust enough to enhance and upgrade the performance of commercial variable speed ac motor drives, . The specific objective is to ensure that the technique can be applied to a wide range of different ac motors (from different motor manufacturers) and that the inverter can setup its control parameters automatically if appropriate. This plug and play , high performance sensorless control will allow the inverter to be used for a variety of new applications and for a wide range of power ratings. Before potential licensees are willing to invest in the technology, it is crucial to demonstrate that it can be used in plug and play mode with any ac motor. The technical work package within this Follow-on fund will deliver this proof thereby making successful commercialisation possible.