Simplified algorithm of synchronous frequency conversion soft starting motor rotor position detection

Abstract

The invention discloses a simplified algorithm of synchronous frequency conversion soft starting motor rotor position detection. According to the simplified algorithm, motor stator three-phase voltage waveforms at different rotation speeds are collected through a voltage hall circuit and an analog sampling circuit and are compared synchronously, and the position of a motor rotator is judged. An appropriate contravariant pulse is given according to the judged real-time rotor position to enable a corresponding thyristor to be opened, and a motor rotates in the process of starting. By means of the simplified algorithm, a rotator position detecting device does not need to be connected to the outer side of the motor, the processes of field installation and debugging of equipment are greatly simplified, the occurrence that different rotor position detecting devices need to be additionally arranged for different devices is avoided, and therefore complex external connection and maintaining cost can be reduced. The simplified algorithm is simple, practical and easy to achieve, not affected by different parameters such as motor manufacturers, types and power and suitable for synchronous frequency conversion soft starting devices of different motors.

Description

technical field [0001] The invention belongs to the technical field of electric engineering and electronics, and in particular relates to a simplified algorithm for detecting the rotor position of a synchronous variable frequency soft starter motor. Background technique [0002] With its adjustable power factor and output torque insensitivity to power grid voltage fluctuations and other good operating performance, synchronous motors take the lead in the field of high-power electric drives and are ideal for driving large fans, water pumps, compressors, blast furnace blowers, and short-circuit test units. The optimal model is an indispensable key equipment for pumped storage power stations. The synchronous motor not only has a good power factor itself, but also can feed inductive reactive power to the grid by adjusting the rotor excitation current, which is conducive to improving the power factor of the grid. Although the synchronous motor has many advantages, its biggest dis...

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Problems solved by technology

Although this method solves the problem of judging the initial position of the rotor, especially when the rotor is at rest, the accuracy of the calculation is guaranteed through the corresponding integral algorithm and filtering loop, but it is only limited to the case where the rotor is not rotating. The delay brought by the algorithm may not be able to track the rotor position in the rotating motor in time, especially in the high-speed state, and the corresponding ones at the ms level cannot meet the requirements

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