The method of limiting stator current and voltage in a three-zone speed control system using the optimal control strategies "Maximum torque per ampere" and "Maximum torque per volt" without using additional circuits for interior permanent magnet synchronous machine is proposed. The idea is to consistently include two dynamic-limiting blocks in the torque-forming component of the stator current, the first of which prevents the maximum permissible value of the stator current amplitude from exceeding, and the second one -the amplitude of the stator voltage. Formulas are derived for calculating the levels of the constraint without taking into account and taking into account the voltage drop of the stator at the active resistances. References 6, figures 3.
In this paper, a detailed analysis of the control algorithms for a permanent magnet synchronous motor in a wide range of speeds is carried out using the optimal strategies: "Maximum torque per ampere" (first zone), "Field weakening mode" (second zone) and "Maximum torque per volt" (third zone). A method for determining the boundaries of the first and second zones, as well as a method for determining the maximum static moment with which the motor can operate without the risk of irreversible demagnetization of permanent magnets, was proposed. It allows determining the maximum possible operating speed of the motor at a given load, the maximum motor load at a given speed, as well as the advisability of using the third control zone to achieve the maximum motor speed. References 19, figures 4.
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