结果表明：不检测转子磁链的滑差频率矢量控制系统具有结构简单、控制性能优良等特点。

The result show that the system possesses the features of simple structure and excellent control characteristics etc without detecting the slip frequency of the rotor's magnetic field.

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但是对转子磁链估计的精度要求很高。

But it needs a high accuracy of estimation of rotor flux.

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当电机转速的估计值收敛于转速的真实值时，观测的转子磁链也收敛于其真实值，可将其用于直接磁场定向控制中。

When the estimated speed converges to the actual rotor speed, the rotor flux observed converges to its true value, which can be used in direct field orientation control (DFOC).

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