Direct torque control system and method for dual-redundancy permanent-magnet fault-tolerant motors

Abstract

The invention discloses a direct torque control system and a method for dual-redundancy permanent-magnet fault-tolerant motors. The system comprises two direct torque control systems which are same in structure and correspond to the permanent-magnet fault-tolerant motors respectively, wherein any direct torque control system comprises an input unit, a storage unit, a detection unit, a DSP (Digital Signal Processor) and an inverter control unit; the detection units comprise voltage detection modules, current detection modules and encoders; and the DSPs comprise coordinate transformation units, flux linkage computing units, torque computing units, comparing units, PI (Proportional-Integral) regulating units, fault predication units, communication units, torque distribution units, torque hysteresis control units, flux linkage hysteresis control units and voltage vector determination units. According to the system and the method, a dual-redundancy technique and a fault-tolerant technique are sufficiently combined, so that the reliability of the system is improved, and rich voltage space vectors of the permanent-magnet fault-tolerant motors are effectively utilized.

Description

technical field [0001] The invention relates to a direct torque control system and method of a double redundant permanent magnet fault-tolerant motor. Background technique [0002] At present, the control methods for permanent magnet fault-tolerant motors mainly include look-up table method, optimal torque control method and optimal current control method. These voltage space vectors are not only beneficial to improve the output performance of the motor, but also facilitate the fault-tolerant control of the motor. The above-mentioned control methods for permanent-magnet fault-tolerant motors do not combine the full-bridge drive topology for fault tolerance. In addition, the existing technology generally only performs fault-tolerant control for a single motor, and does not effectively use the double redundancy technology; the direct torque control technology is to control the stator flux linkage, directly in the stator static coordinate system with the concept of space vector...

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Problems solved by technology

[0002] At present, the control methods of permanent magnet fault-tolerant motors mainly include look-up table method, optimal torque control method and optimal current control method. Since permanent magnet fault-tolerant motors generally use inverters with a full-bridge drive topology, they have rich These voltage space vectors are not only conducive to improving the output performance of the motor, but also provide convenience for the fault-tolerant control of the motor. The control methods of the permanent magnet fault-tolerant motor mentioned above are not combined with the full-bridge drive topology for fault tolerance. In addition, the existing technology is generally only for fault-tolerant control of a single motor, without effective use of dual redundancy technology; direct torque control technology is to control the stator flux linkage, directly in the static coordinate system of the stator with the concept of space vector, through The detected stator voltage and current directly calculate and control the flux linkage and torque of the motor in the stator coordinate system to obtain a high-performance control method with high dynamic performance of the torque, and the motor direct torque control existing in the prior art The system does not fully integrate the dual redundancy technology and fault tolerance technology, the reliability is low, and it cannot guarantee that the motor will continue to run stably after a one-phase open circuit fault and a controller fault occur.

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