Development of Control Chip for Position-Sensorless IPM motor Drive systems

本研究旨在开发一种控制芯片，既能对无位置传感器内置式永磁同步电机(IPM电机)驱动系统进行单芯片控制，又能对其进行全数字控制。控制芯片提供基于磁凸度的无传感器位置估计，这是由头部研究人员提出的。该控制芯片使得只需将IPM电机的电源线连接到逆变器端子上就可以形成位置控制系统或速度控制系统。结合2002年的研究，设计并制作了3.7kW的IPM电机驱动主电路和接口板，接口板与带有一片FPGA的评估板相连，该评估板包括对应于20万门的逻辑电路。结合2003年的研究，用硬件描述语言VHDL语言对纹波检测电路和脉宽调制发生电路进行了描述，并开发了基于DSP核的控制软件，并在FPGA中实现。利用研制的驱动系统进行的实验表明，该位置估计电路具有较好的位置估计精度，平均值为±1.1度(电动角)，离散度为0.5度。此外，所开发的位置估计控制芯片可以实现20rad/S的快速位置控制和电机轴的电锁(伺服锁)，而不需要任何轴载传感器。正在开发的控制芯片适用于其他IPM电机，无需任何参数调整，它希望控制电路小型化，防止因电气噪声而导致的误操作。调查人员希望该控制芯片能投入实际使用。

This research aims to develop a control chip, which can control a position-sensorless interior permanent magnet synchronous motor (IPM motor) drive system not only by means of one chip control but also fully digital control. The control chip provides the sensorless position estimation based on magnetic saliency, which has proposed by the head investigator. This control chip makes it possible to form a position control system or a speed control system just connecting the power cables of an IPM motor to inverter terminals. Concerning research of 2002, the investigator design and produce a main circuit to drive an IPM motor of 3.7kW and an interface board which is connected with an evaluation board carrying an FPGA including logic circuits corresponding 200,000 gates. Concerning research of 2003, a ripple detection circuit and a PWM generation circuit are developed by describing it in the hardware description language VHDL, and a control software for a DSP core which is implemented in the FPGA is also developed. Experiments using the developed drive system illustrates that position estimation circuit has a good position estimation accuracy within ±1.1 degree (electrical angle) in average value with 0.5 degree dispersion. Moreover, it is shown that the developed control chip providing the position estimation makes it possible to realize a fast position control of 20 rad/s and an electrical lock of the motor shaft (servo lock) without any shaft-mounted sensor. A developing controlled chip is applicable to other IPM motors without any parameter adjustment, and it expects miniaturization of the control circuit and prevention of incorrect operation caused by electrical noises. The investigators hope that the control chip is put into practical use.