On-line diagnosis method for turn-to-turn short circuit fault of double redundancy permanent magnet synchronous motor coil

A permanent magnet synchronous, short-circuit fault technology, applied in the control of generators, motor control, motor generator control, etc.

Active Publication Date: 2018-09-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the very fast adjustment of the current regulator, there is almost no difference between the current of the normal set and the faulty set of the double redundant permanent magnet synchronous motor when an inter-turn short circuit occurs. Many diagnostic methods that use current as the fault feature are not suitable for each phase winding. No Electromagnetic Coupling Low Thermal Coupling Double Redundancy Permanent Magnet Synchronous Motor

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  • On-line diagnosis method for turn-to-turn short circuit fault of double redundancy permanent magnet synchronous motor coil
  • On-line diagnosis method for turn-to-turn short circuit fault of double redundancy permanent magnet synchronous motor coil
  • On-line diagnosis method for turn-to-turn short circuit fault of double redundancy permanent magnet synchronous motor coil

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Embodiment Construction

[0053] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0054] Depend on figure 1 The cross-sectional view and partial enlarged view of the double-redundancy permanent magnet synchronous motor with no electromagnetic coupling between the windings of each phase and low thermal coupling can be seen. The motor adopts 12-slot and 10-pole fractional-slot double-layer concentrated winding, which conforms to Z=2p+2 (Z is the number of slots, p is the number of pole pairs) The number of slot poles is matched, and there is no interlinkage between the armature reaction magnetic fields of each phase winding. The difference from the traditional motor is that this motor adds a small tooth 30 at the common slot of the adjacent phase windings to provide a channel for the leakage flux, which greatly reduces the mutual leakage inductance of the slots, and can be approximated as the slot leakage of the adjacent t...

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Abstract

The invention discloses an on-line diagnosis method for a turn-to-turn short circuit fault of a non-electromagnetic coupling low-thermal coupling double redundancy permanent magnet synchronous motor coil among each winding based on an instantaneous power principle. When a coil turn-to-turn short circuit of a certain set of three-phase winding occurs, corresponding equivalent resistance, equivalentinductance and equivalent induction electromotive force of the phase where the fault coil is located change, fault winding parameters are differed from normal three-phase winding parameters when 3/2static coordinate system switching is conducted, currents of the two three-phase winding are almost the same, and therefore the situation where instantaneous active power or instantaneous reactive power is consumed by the fault three-phase winding is differed from the normal three-phase winding. According to the method, the motor is in a braking state or an electric state, the absolute value and the average value of the difference of the instantaneous active power or the difference of the instantaneous reactive power of the two windings, whether the absolute value or the average value is positive or negative and the forward or reverse rotation state of a motor within the latest limited sampling control periods are calculated in real time to judge coil turn-to-turn short circuit fault occurs on which three-phase winding on line.

Description

technical field [0001] The invention belongs to the field of motor fault diagnosis, and in particular relates to an online diagnosis method for inter-turn short-circuit faults of double-redundancy permanent magnet synchronous motor coils based on instantaneous power theory. Background technique [0002] Permanent magnet synchronous motors have the advantages of reliable operation, simple structure, high power factor and high efficiency, but in aviation, national defense and military fields that require high reliability operation, traditional permanent magnet synchronous motors cannot meet certain performance indicators. In order to meet the requirements of high reliability, the R&D personnel applied the idea of ​​redundancy to the motor and designed a double-redundancy permanent magnet motor. [0003] The double-redundant permanent magnet synchronous motor without electromagnetic coupling between the windings of each phase involved in the present invention eliminates the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P25/022H02P29/024H02P29/028
CPCH02P21/50H02P25/024H02P29/027H02P29/032
Inventor 陈益广赵晓斌沈勇环
Owner TIANJIN UNIV
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