DEVELOPMENT OF INTERIOR PERMANENT MAGNET SYNCHRONOUS GENERATOR THAT CAN GENERATE FROM WEAK WIND WITH CHANGING ARMATURE FLUX LINKAGE.

本研究的目的是开发一种从低速到高速在宽风速下运行的高性能风力发电机。由于风车的转速非常慢，为了提高发电机的效率，必须安装加速齿轮。然而，齿轮传动系统的噪声大，使发电机系统变得笨重。本研究提出的多极室内永磁同步发电机（IPMSG）能够在大风速范围内运行。然而，由于所提出的IPMSG需要强大的永磁体，因此产生了大的齿槽转矩。这种较大的齿槽转矩干扰了风车在低风速下的平稳运行，使风车无法在低风速下运行。因此，风车的利用系数下降。本文提出了一种新型多极转子埋条磁体的IPMSG。对所提出的IPMSG的齿槽转矩和转矩脉动改善进行了研究。该转子的磁通屏障采用非对称结构设计，以提高齿槽转矩。此外，每一块具有不对称磁阻的硅钢片都以一个极距旋转并层压。因此，与普通IPMSG相比，齿槽扭矩大大提高。感应电压的高谐波分量也降低了。转矩脉动，如果使用该发电机作为电机，减少到1/20。所提出的带辐条型磁体的多极IPMSG能够在非常宽的风速下工作。由于在低风速下风力向电能的转换量不大，提高了风力发电系统的运转率。

The aim of this study is to develop the high performance wind power generator, which operates at the wide wind velocity from low to high velocity.As the rotary speed of windmill is very slow, a speed up gear is indispensable to improve the efficiency of the generator. The gear, however, causes the large noise and generator system becomes heavy.An Interior permanent magnet synchronous generator (called IPMSG) with multi-pole, which is proposed in this study, is able to operate in the wide wind speed range. As the proposed IPMSG, however, requires strong permanent magnets, then the large cogging torque comes out. This large cogging torque disturbs the smooth operation of the windmill at low wind velocity, and the windmill can not operate at the low wind velocity. As a result, the utilization factor of windmill goes down.In this study, the new multi-pole IPMSG with spoke magnets buried in the rotor is proposed. The cogging torque and torque ripple improvement of the proposed IPMSG is examined.The flux barrier of the proposed rotor is designed in an asymmetrical structure to improve the cogging torque. Moreover, every silicon steel plate, which has an asymmetrical flux barrier, is revolved with one pole pitch and laminated.As a result, the cogging torque is greatly improved compare with ordinary IPMSG.. The high harmonic components of the induced voltage reduced, too. Torque ripple, if this generator is used as the motor, is reduced to 1/20.The multi-pole IPMSG with spoke type magnets proposed is able to operate at very wide wind velocity. As the conversion wind power to the electric power at the low wind velocity is not large, the rate of operation of the wind power generation system is improved.