Current sensor-free control method and system for permanent magnet synchronous motor
A technology of permanent magnet synchronous motor and control method, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problems of inability to meet force control accuracy, easy to generate noise, etc., and achieve numerical stability and accurate response , the effect of increasing redundancy
Pending Publication Date: 2020-07-14
廖铉泓
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[0002] Since the permanent magnet synchronous motor has the advantages of high efficiency, good speed regulation performance, and high power density, the permanent magnet synchronous motor is widely used in the occasion of AC speed regulation. In the control of the permanent magnet synchronous motor, it is usually necessary to collect current, stator resistance, Rotor flux linkage and other parameters are controlled by the corresponding mathematical model, but the cheap current sensor is prone to noise due to the influence of electromagnetic pulse, ADC noise and temperature change, so it cannot meet the requirements for high force control accuracy. situation
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[0056] This part will describe the specific embodiment of the present invention in detail, and the preferred embodiment of the present invention is shown in the accompanying drawings. Each technical feature and overall technical solution of the invention, but it should not be understood as a limitation on the protection scope of the present invention.
[0057] In the description of the present invention, multiple means more than two, greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.
[0058] In the description of the present...
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The invention discloses a current sensor-free control method and system for a permanent magnet synchronous motor. A q-axis voltage and a d-axis voltage are estimated by adopting a current-free sensorcontrol module on the basis of a motor model; a rotating speed and an electric angle speed are obtained through a position sensor, an estimated current value is more stable; when a d-axis actual current and a q-axis actual current reach a steady state, the estimated current can be rapidly converged to the actual current, and therefore, the method is suitable for fields in which the control frequency of an outer ring (such as a speed ring or a position ring) is far lower than that of an inner ring, and fields having high requirements for force control precision. Compared with a traditional PI controller, current sensor-free control is based on the motor model, integral control is avoided, so that control time lag is lower; the redundancy of a motor driver is increased, and the motor can still operate normally after a current sensor fails due to accidents.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a control method and system for a permanent magnet synchronous motor without a current sensor. Background technique [0002] Since the permanent magnet synchronous motor has the advantages of high efficiency, good speed regulation performance, and high power density, the permanent magnet synchronous motor is widely used in the occasion of AC speed regulation. In the control of the permanent magnet synchronous motor, it is usually necessary to collect current, stator resistance, Rotor flux linkage and other parameters are controlled by the corresponding mathematical model, but the cheap current sensor is prone to noise due to the influence of electromagnetic pulse, ADC noise and temperature changes, so it cannot meet the requirements for high force control accuracy. situation. Contents of the invention [0003] The present invention aims to solve at least one of the techn...
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IPC IPC(8): H02P21/14H02P25/022
CPCH02P21/14H02P25/022H02P2207/05
Inventor 廖铉泓
Owner 廖铉泓