Double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method

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

Active Publication Date: 2018-02-27
TIANJIN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

The existing method is difficult to realize the online diagnosis of which set of three-phase windings has a short-circuit fault between coil turns when there is no electromagnetic coupling between each phase winding and low thermal coupling.

Method used

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  • Double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method
  • Double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method
  • Double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method

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Embodiment Construction

[0045] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] Depend on figure 1 The cross-sectional view of the double-redundancy permanent magnet synchronous motor with no electromagnetic coupling and low thermal coupling among the phase windings shows that the motor is evolved from the traditional 12-slot 10-pole three-phase fractional-slot concentrated winding permanent magnet synchronous motor. On the permanent magnet synchronous motor stator, a small tooth 40 ( figure 1 The reference numeral 50 in the middle is a large tooth), so that the coil sides in the small slots on both sides of the small tooth 40 belong to windings of different phases, the slot leakage magnetic flux of the coil is closed by the small tooth 40, and there is almost no electromagnetic coupling between the two adjacent phase windings 20 ; The mutual inductance between each phase winding is almost zero, without electro...

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Abstract

The invention discloses a double-redundancy permanent magnet synchronous motor coil inter-turn short-circuit online detection method. The method is based on the principle that the impedance of a residual normal winding where a fault exists is reduced during inter-turn short-circuit of a coil, that is, when a motor works under a double-redundancy operation mode, if the inter-turn short-circuit happens to the coil, the equivalent resistance and inductance parameters in a Park equation of a winding where the fault exists have certain reduction, and currents of the two windings are basically the same, so that direct-axis voltages of the two windings have a certain deviation. By means of the plus or minus average value and the absolute value of the difference between the direct-axis given voltages of the two windings of first several DSPs in each PWM sampling control period, and motor operation state judgment made through the rotation direction of a motor permanent magnet rotor and the plusor minus quadrature-axis given current, to which three-phase winding the coil inter-turn short-circuit fault happens is online diagnosed between different phases of windings under the double-redundancy operation mode of an electromagnetic-coupling-free low-thermal coupling double-redundancy permanent magnet synchronous motor.

Description

technical field [0001] The invention belongs to the field of electrical engineering. Aiming at the problem of on-line diagnosis of inter-turn short-circuit faults of permanent magnet synchronous motor coils without electromagnetic coupling between windings of each phase and low thermal coupling with double redundancy, a method based on the current operating state of the motor and the current two sets of winding direct axes are proposed. Given the positive and negative values ​​of the average value of the voltage difference and the absolute value, online diagnosis of no electromagnetic coupling between the windings of each phase, low thermal coupling, double redundancy, permanent magnet synchronous motor, which set of three-phase windings has coils during double redundancy operation Method for turn-to-turn short circuit fault. Background technique [0002] Permanent magnet synchronous motor has the advantages of high power density, high operating efficiency, simple structure,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 陈益广陈雪敏沈勇环张博
Owner TIANJIN UNIV
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