搜索 - 科创

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可能做不出来，这个需要的扭力太大了。这个情况类似于直驱电梯拽引机，硅钢的饱和磁通限制了扭力。直驱SCARA有朋友做出来了，1arcsec的误差

用到额定负载很极限了，我们这些应用估计芝麻大的轴承球才差不多额定负载，不然都是大幅度降额，全程light preload保持hydrostatic的话应该是无限寿命的。

从实用角度考虑，这种减法器电路的CMRR比较差，因此在实际上是比较少用的，尽量都用反相放大器解决问题，至少在抗干扰方面有一定的优势

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