6GK7242-5DX30-0XE0

6GK7242-5DX30-0XE0

电机通过将转子磁极数从4个增加到10个，将霍尔效应IC信号频率提高了2.5倍。这使得低速运行时的反馈信号平滑，减少了电机中的纹波速度。

由于无刷电机使用传感器来检测磁极，因此它们不适合低速运行。但是，随着磁分析技术、软件信号处理技术和驱动技术的改进，低运行速度已从4极电机的300转/分降低到80转/分。 此外，即使在低速度下输出扭矩也恒定，因此可以在较宽的速度范围内实现平稳的旋转控制。

5.2 宽 速度控制范围(高速 运行)

霍尔效应IC信号波形和电机电流波形如图5.5所示。

与 500 RPM 相比，关于霍尔效应 IC 信号，在 1000 RPM 时可以观察到电流波形滞后和电机电流增加。

对无刷电机进行驱动时，根据霍尔效应 IC 信号和励磁模式向绕组施加电压。但是，如果转速增加，则由于电机电感，电流相位会出现滞后。 电流相位中出现的滞后对电机中产生的扭矩产生无效电磁力，从而降低有效电磁力。由于电机执行控制以保持转速，因此电流增加并产生必要的扭矩。此外，如果速度增加，相位滞后增加，旋转停止。

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