SPEED SENSORLESS CONTROL METHOD AND APPARATUS FOR BRUSHLESS DC MOTOR

摘要

The present invention uses a lot of time relates to the speed sensor-less control apparatus and method for a brushless DC motor, conventionally, by configuring the report observer the velocity and position in the state variable to use a method of estimating the speed and position, the sliding Observer , the sliding observer due to the use of discontinuous functions as a switching function, there has been a problem that chattering occurs (chattering) of the unavoidably high frequency at the time of estimation. Accordingly, the present invention limits the area of ​​the tolerance of the estimation error calculated in the group following the control device of the brushless DC motor, an adder to obtain the estimation error between the follow-up current is obtained from the actual current and the equation of state flowing in the brushless DC motor, the adder set, and the set limit region estimation error enters continuously enter the estimation error of the output and the adder on the secondary loop regulator and the auxiliary loop regulator to set the gain of the main loop regulator to remain without departing from this region in the brush the binary observer consisting gain adjuster to allow the main loop regulator for outputting a switching function, by adjusting the gain of the switching function of the continuous output from the main loop regulator to the error sign stably converge to the origin coming within the marginal zone a control apparatus of a DC motor-less Use group follow, by so as to follow the speed and position of the brush-less DC motor, which is to obtain an improved estimation performance.