A mutual model reference adaptive method for the rotor speed and stator resistance identification is proposed in this paper to implement a speed sensorless direct torque control of induction motors.

本文介绍了一种可互换模型参考自适应方法实现对电机转速和定子电阻的辨识，并将其应用于异步机的无速度传感器直接转矩控制中。

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Almost 3 decades later, his model and a mutual fund based on it have accumulated quite an enviable track record, even through the financial crisis in 2008.

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Since 1982, Brown's model portfolio of mutual funds has produced annualized returns of 15.5%, compared to 13.3% for the DJ Wilshire 5000 over the same time period, according to Hulbert Financial Digest.

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In effect, Schwab is repeating a model it built for mutual funds years ago, hoping to attract the hordes of retirement investors who need access to the products at a low cost.

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