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Experimental Evaluation of a Rare Earth-Free Permanent Magnet Generator

机译：稀土永磁发电机的实验评价

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Low speed, high torque machines are used in wind turbines where the turbine rotor is directly connected to the generator. A permanent magnet synchronous generator using high-energy rare-earth permanent magnets (PMs) is one common choice for this application, but rare-earth PMs have supply insecurities and cost risks. A rare-earth free 32-pole PM generator, using ferrite PMs in a spoke-type rotor, for use in a 12 kW experimental wind turbine is built and tested. Voltages and currents at load and no load are measured, as well as the magnetic field in the end regions of the machine. The generator can deliver the required power at nominal speed and has low harmonic content in the output. The electrical measurements are compared to two-dimensional finite element design calculations and the experimental results are lower than expected from simulations. The measured voltage is lower than expected, requiring a higher current than calculated for the rated power. Three-dimensional magnetic field simulations show that there are leakage flux paths in the end-regions that the two-dimensional design calculations overlook, explaining the discrepancy between simulations and measurements.
机译：低速，高扭矩机用于风力涡轮机，其中涡轮转子直接连接到发电机。使用高能稀土永磁体（PMS）的永磁同步发电机是本申请的一种常见选择，但稀土PMS提供不安全感和成本风险。一种稀土自由32极PM发生器，在辐条型转子中使用铁氧体PMS，建立并测试了12 kW实验风力涡轮机的使用。测量负载和无负载的电压和电流，以及机器的端部区域中的磁场。发电机可以以名义速度提供所需的功率，并在输出中具有低谐波含量。将电测量与二维有限元设计计算进行比较，实验结果低于模拟预期的实验结果。测量的电压低于预期，需要比额定功率计算的更高电流。三维磁场模拟表明，端区存在泄漏通量路径，即二维设计计算俯瞰，解释模拟和测量之间的差异。

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