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Fault current suppression method and system for double-electrical-port variable- flux motor, and medium

A technology of fault current and variable magnetic flux, applied in the control system, current controller, AC motor control and other directions, can solve the problem of reducing the effect of fault current, excessive short-circuit current, high back electromotive force of permanent magnet synchronous machine, etc.

Active Publication Date: 2021-06-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the winding structure of the motor needs to be adjusted in order to continue to use the winding to apply a weak magnetic current to complete the demagnetization after the armature winding fault occurs, thereby reducing the effect of the fault current
[0005] In view of the above-mentioned related technologies, the inventor believes that there is a problem of excessively high counter electromotive force and excessive short-circuit current after a short-circuit fault occurs in the permanent magnet synchronous machine. Therefore, it is necessary to propose a technical solution to improve the above-mentioned technical problems

Method used

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  • Fault current suppression method and system for double-electrical-port variable- flux motor, and medium
  • Fault current suppression method and system for double-electrical-port variable- flux motor, and medium
  • Fault current suppression method and system for double-electrical-port variable- flux motor, and medium

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Embodiment 1

[0040] refer to figure 1, The double-winding variable flux memory motor has a stator with 48 slots and a rotor with 8 poles. It includes a stator core 1, a stator armature winding 2, a rotor core 3, and a demagnetizable permanent magnet 4. The rotor core 3 is located at the bottom of the stator core 1. internal. Both the stator core 1 and the rotor core 3 can be made of laminated silicon steel sheets; the stator armature winding 2 is placed on the stator core 1 , and the demagnetizable permanent magnet 4 is placed on the rotor core 3 . In this embodiment, the stator armature winding 2 is a double three-phase AC winding, that is, two sets of three-phase armature windings, and a total of twenty-four armature coils are formed, that is, each set of three-phase armature windings includes twelve armature windings. Armature coil, wherein each phase armature winding includes four armature coils, specifically, the first armature winding includes 2A-1 phase, 2B-1 phase, 2C-1 phase; the...

Embodiment 2

[0047] The variable flux memory motor system, the main structure of the motor includes a stator core 1, a variable flux permanent magnet placed on the stator core 1; an AC armature winding placed on the stator core 1; a DC pulse current winding placed on the stator core 1; Rotor core 3. When the motor is running normally, the armature winding is loaded with a periodic sinusoidal current, and a stable torque is output to complete the electromechanical energy conversion. At this time, the DC pulse current winding does not work. When a short-circuit fault occurs in the AC armature winding of the motor or the corresponding three-phase inverter fails, a demagnetizing DC current pulse is actively loaded on the dedicated DC pulse current winding to weaken the magnetic field strength of the demagnetizable permanent magnet, thereby reducing the electric current. The magnitude of the counter electromotive force and the magnitude of the short-circuit current induced on the pivot winding....

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Abstract

The invention provides a fault current suppression method and system for a double-electrical-port variable-flux motor and a medium, and the double-electrical-port variable-flux memory motor comprises a stator core and a three-phase AC armature winding disposed on the stator core. The three-phase alternating-current armature winding comprises a first armature winding, a second armature winding, a rotor iron core and a demagnetized permanent magnet placed on the rotor iron core, and the two sets of armature windings of the motor are independently controlled; and the electric machine is driven by a controller comprising three-phase inverters including a first inverter and a second inverter, the first inverter being electrically connected to the first armature winding and the second inverter being electrically connected to the second armature winding. Under the condition that a motor system breaks down, the residual healthy alternating-current armature winding and the inverter are reasonably controlled, the fault back electromotive force is reduced, and the fault current is restrained; and the method is suitable for occasions with high fault tolerance requirements, and application objects include but are not limited to high-reliability vehicle driving motors, high-power marine driving motors and high-capacity wind driven generators.

Description

technical field [0001] The present invention relates to the technical field of manufacturing and control methods of permanent magnet synchronous motors, in particular to a fault current suppression method, system and medium of double electric port variable flux motors. Background technique [0002] A permanent magnet synchronous motor generally includes a stator core, a stator armature winding, a rotor core, and a demagnetizable permanent magnet. Due to the use of high energy product permanent magnets as the excitation source, permanent magnet synchronous motors have the advantages of high efficiency, high power density, high power factor, etc., and have become an important research content of high-performance motor drive systems. However, the excitation source of a permanent magnet synchronous motor is generally a permanent magnet with constant flux. Due to electromagnetic induction, the permanent magnetic field synchronously rotating with the rotor will generate an alterna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/28H02P25/03
CPCH02P6/28H02P25/03
Inventor 华浩王勇周子成
Owner SHANGHAI JIAO TONG UNIV
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