A method for diagnosing demagnetization faults of permanent magnet synchronous motors
A permanent magnet synchronous motor and fault diagnosis technology, which is applied in the direction of motor generator testing, etc., to achieve accurate positioning and improve accuracy
Active Publication Date: 2020-09-22
HENAN POLYTECHNIC UNIV +1
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Problems solved by technology
[0014] In order to solve the problems existing in the existing demagnetization fault diagnosis technology, the present invention provides a method for detection of demagnetization fault, demagnetization pattern recognition, demagnetization degree evaluation and demagnetization magnetic pole positioning of a permanent magnet synchronous motor, which can overcome the existing demagnetization diagnosis method It is not affected by operating conditions and motor structure. It can not only detect demagnetization faults, identify the degree of demagnetization, but also distinguish between uniform demagnetization and partial demagnetization. precision
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[0043] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, and the present invention is not limited thereto.
[0044] The embodiment of the present invention is completed by a direct-drive permanent magnet synchronous motor, and the first six blocks are selected as test poles, and its basic parameters are shown in Table 1.
[0045] Table 1 Basic parameters of the sample motor
[0046]
[0047] Such as figure 1 As shown, a method for diagnosing a demagnetization fault of a permanent magnet synchronous motor in this embodiment includes the following steps:
[0048] Step (1) Establish a sample library of motor fault feature quantities
[0049] First, number the poles of the sample motor in sequence, such as figure 2 shown in . In this embodiment, the fi...
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The invention discloses a demagnetization fault diagnosis method for a permanent magnet synchronous motor. The method comprises the following steps: establishing a sample library by carrying out different types of demagnetization fault experiments, extracting a counter electromotive force of a coil element, solving a counter electromotive force after a demagnetization fault as well as a residual error of a counter electromotive force under health condition as fault characteristic quantities, and establishing a demagnetization fault characteristic quantity sample library and an energy section library through correlation formula transformation. A counter electromotive force signal of a coil is acquired in real time, according to amplitude of a counter electromotive force residual error signal, a correlation coefficient method is utilized for analyzing correlation of a measured fault characteristic quantity with each fault characteristic quantity in a lookup table, by virtue of energy ofthe counter electromotive force residual error signal and by combining an analysis result of a correlation coefficient, the demagnetization fault and demagnetization degree can be diagnosed, and uniform demagnetization and local demagnetization can be distinguished; meanwhile, a magnetic pole in fault can be rapidly and accurately located when a motor is in a local demagnetization fault, so that accuracy for diagnosing the demagnetization fault of a permanent magnet synchronous motor is effectively improved.
Description
technical field [0001] The invention relates to the field of motor fault diagnosis, in particular to methods for demagnetization fault detection, demagnetization pattern recognition, demagnetization degree evaluation and demagnetization pole positioning of permanent magnet synchronous motors. Background technique [0002] Due to its high power density, high efficiency, and high reliability, permanent magnet synchronous motors have been widely used in industrial servo drives, robots, aerospace, new energy vehicles, and new energy power generation. However, the stability of permanent magnet materials is easily affected by factors such as operating temperature, armature reaction, manufacturing defects, and natural life. The loss of magnetic force leads to a decrease or distortion of the magnetic induction intensity amplitude, resulting in partial demagnetization or uniform demagnetization failure of permanent magnets. When the permanent magnet has an irreversible demagnetizatio...
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IPC IPC(8): G01R31/34
CPCG01R31/34
Inventor 高彩霞吕珂封海潮聂言杰司纪凯李应生朱瑞卿许胜军
Owner HENAN POLYTECHNIC UNIV