Method for positioning first-on rotor for alternating current permanent-magnet synchronous motor control system
A permanent magnet synchronous motor and motor rotor technology, applied in control systems, electronic commutation motor control, electrical components, etc., can solve problems such as long positioning time, wrong positioning, and complex systems
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[0010] Install an ordinary incremental encoder on the rotor of the motor, and use the number of A and B pulses it outputs to represent the change of the rotor position. At the same time, when the motor is manufactured, the induction Hall element of the rotor magnetic pole position is pre-installed and equipped with a common incremental encoder, or a special incremental encoder with U, V, W signals is installed. Such as figure 1 As shown, the U, V, and W state signals sent by the Hall element or the encoder have a total of six level states, 101, 100, 110, 010, 011, and 001, which represent the electrical angle position of the motor rotor. Six equidistant interval, each interval is 360÷6=60° electrical angle. At the initial power-on moment, the U, V, and W signal states sent by the incremental encoder determine the interval where the initial position of the rotor magnetic field vector of the motor is located. The midpoint of this interval is taken as the rotor magnetic field ve...
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