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hall to fast 噪音问题

hall 启动 方波  3hz 转到 fast(hall变化5,6次切换到正弦)   。 方波时噪音大。   手头有个st 的产品, 方波到正弦 ,声音很小。它总是 hall 变化2次就切换到正弦。(虽然电流波形不好,但声音小), 有没有什么好方法?