描述
转速指标在步进电机的选取时至关重要，步进电机的特性是随着电机转速的升高，扭矩下降，其下降的快慢和很多参数有关，如:驱动器的驱动电压、电机的相电流、电机的相电感、电机大小等等，一般的规律是：驱动电压越高，力矩下降越慢;电机的相电流越大，力矩下降越慢。在设计方案时，应使电机的转速控制在600转/分或800转/分以内，当然这样说很不规范，可以参考〈矩-频特性〉。
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