Fault tolerant permanent magnet machine phase correction system and method

Abstract

The invention discloses a fault tolerant permanent magnet machine phase correction system and a method in the electrical drive field. The system comprises H-bridge power converters which are independent from one another, the upper bridge arm of each H-bridge power converter is connected with the positive end of a direct-current power supply, the lower bridge arm of each H-bridge power converter is connected with the negative end of the direct-current power supply, and a leading-out wire of the joint of each upper bridge arm and each lower bridge arm is connected with a fault tolerant permanent magnet machine armature coil through a choke inductor. A microprocessor detects power supply bus voltage through a voltage transducer, detects power bus current through a current transducer, detects a rotor position through a rotor position sensor, and calculates rotor rotating speed. Phase difference of various phases of sine wave pulse width modulation voltage fundamental waves and armature current is calculated according to formulas, driving signals are distributed to various power switch pipes according to the phase difference and the rotor position to enable the various phases of the sine wave pulse width modulation voltage fundamental waves to exceed an electric angle of the rotor position, and therefore the fact that the armature current and induced electromotive force are in the same phase is guaranteed. Accurate detection is not needed to be conducted to various current phases, measurement is simple, and accuracy is high.

Description

technical field [0001] The invention belongs to a permanent magnet fault-tolerant motor in the field of electric power transmission, in particular to a phase correction system and a method for a permanent magnet fault-tolerant motor, and is especially suitable for high-reliability electric power transmission fields such as ship drive, aerospace, and military equipment. Background technique [0002] The permanent magnet fault-tolerant motor not only has the advantages of high efficiency and high power density of the general permanent magnet motor, but also has the ability of physical isolation, thermal isolation, magnetic isolation, electrical isolation and suppression of short-circuit current. If it is combined with the corresponding fault-tolerant control strategy, Then it can achieve both high-performance output and fault-tolerant operation. Therefore, since the emergence of permanent magnet fault-tolerant motors in the 1990s, they have been more and more widely used in hi...

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Problems solved by technology

However, it is very difficult to accurately detect the current phase of each phase. The main reasons are as follows: ①The current sensor is expensive. If it is necessary to accurately detect the current phase of each phase, it is necessary to equip a current sensor for each phase, which greatly increases the hardware cost. ; ② It is necessary to detect the armature current value in real time according to the rotor position and cooperate with a certain algorithm to extract the phase of the current. The anti-interference ability is poor, the real-time requirements are high, and the algorithm is more complicated; High, high anti-interference and real-time requirements, which put forward higher requirements for hardware and software

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