| 摘要 |
A method of estimating the speed of an induction motor and the magnetic flux of a rotor is disclosed. The method consists of the steps of a) obtaining some measurable or calculable variables for estimating the speed of the induction motor and the magnetic flux of the rotor; b) calculating a parameter as a counter-electromotive force of the motor derived from the variables obtained in the step a); c) estimating the speed of the motor by use of the parameter calculated in the step b), an estimated value of the parameter, and the obtained variables; and d) estimating the magnetic flux of the rotor by use of an estimated value of the speed estimated in the step c) and the parameter. As the present invention estimates the speed of the motor and the magnetic flux of the rotor using the parameters obtained from the measurable or calculable variables, an estimation algorithm requires fewer calculation equations compared the prior estimation algorithm using the full-order observer, resulting in a reduced amount of calculation. Accordingly, a sensorless speed control system of the induction motor can be easily implemented with the superiority of low-speed characteristic and the stable and fast response characteristics of speed in a wide operation region.
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