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A fault-tolerant direct torque control method for the lack of one phase input in a series motor drive system

A technology of direct torque control and drive system, applied in motor control, motor generator control, electronic commutation motor control, etc., can solve problems such as destroying electromagnetic torque decoupling and uncontrollable phase windings

Active Publication Date: 2019-02-22
FUZHOU UNIV
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Problems solved by technology

For a six-phase motor with one phase missing, the phase winding that is electrically spatially symmetrical to the missing phase winding is uncontrollable; moreover, the currents in the other two windings that are electrically spatially symmetrical no longer maintain an anti-phase relationship, thus destroying both motors Electromagnetic torque decoupling between

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  • A fault-tolerant direct torque control method for the lack of one phase input in a series motor drive system
  • A fault-tolerant direct torque control method for the lack of one phase input in a series motor drive system
  • A fault-tolerant direct torque control method for the lack of one phase input in a series motor drive system

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Embodiment Construction

[0060] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0061] When a six-phase symmetrical winding permanent magnet synchronous motor is connected in series with a three-phase permanent magnet synchronous motor drive system and one phase is lost on the input side, if the six-phase is not considered in the establishment of the mathematical model of the two-motor series drive system and the construction of the fault-tolerant direct torque control strategy The lack of phase winding contribution in the motor, which leads to the destruction of the symmetric characteristics of the original six-phase motor stator winding, makes it impossible to find a set of effective coordinate transformations to decouple the six-phase motor and the three-phase motor with one missing phase. In the end, the remaining five healthy inverter bridge arm output voltage vectors cannot be used to realize the electromagnetic...

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Abstract

The invention relates to a fault-tolerant direct torque control method of a series motor driving system having an input lack of a phase. The fault-tolerant direct torque control method is particularly applied to a six-phase permanent-magnet synchronous motor of which power is supplied by a single inverter and which is connected in series with a three-phase permanent-magnet synchronous motor driving system, and aims to achieve decoupling control on instantaneous electromagnetic torques of two motors by using remaining five-phase inversion bridge when an input end of the dual-motor series driving system is lack of a phase, so that the reliability of the series driving system is improved.

Description

technical field [0001] The invention relates to a single-inverter power supply six-phase permanent magnet synchronous motor connected in series with a three-phase permanent magnet synchronous motor drive system input one-phase fault-tolerant direct torque control method. Background technique [0002] With the rapid development of key areas such as aerospace propulsion systems, ship-wide electric propulsion, electric locomotive traction, and electric / hybrid fuel vehicle drives, there are more stringent requirements for the weight and volume of the transmission system, such as lightweight, high power density, low Cost-effective electric drive system will be an important development direction. The series drive system composed of multiple motors powered by a single inverter is an important research direction. Compared with the three-phase drive system with inverter-motor one-to-one power supply, the advantage is that the number of inverter bridge arms is reduced. ; Through a se...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30H02P21/14H02P21/20H02P29/028
CPCH02P21/14
Inventor 周扬忠黄志坡闫震王祖靖钟天云
Owner FUZHOU UNIV
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