Fault diagnosis method of fault-tolerant servo motor drive system
A servo motor and drive system technology, applied in the field of motors, can solve the problems of a large number of sensors, complex system design, and many electrical equipment, etc., to achieve the effect of strong fault tolerance, simple operation, and short diagnosis time.
Inactive Publication Date: 2020-05-01
南京众科汇电气科技有限公司
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Therefore, common open-circuit fault diagnosis methods often have false alarm problems under different load and speed conditions
At the same time, it also has disadvantages such as long diagnosis time, a large number of sensors, and a large number of electrical equipment, which will inevitably lead to more complex system design
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[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without making creative efforts belong to the protection scope of the present invention.
[0025] Step 1: First build a fault-tolerant servo motor drive system. The fault-tolerant servo motor drive system consists of a double-winding fault-tolerant servo motor, two sets of inverters, two sets of speed PI controllers, two sets of current PI controllers, and a high-frequency Signal injection module, a high-frequency response signal extraction module and an open-circuit fault detection and processor, the double-winding fault-tolerant servo motor includes a twelve-slot stator and a ten-pole...
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The invention discloses a fault diagnosis method of a fault-tolerant servo motor drive system. The fault diagnosis method specifically comprises the following steps of step 1, constructing the fault-tolerant servo motor drive system; step 2, acquiring current of each phase of two sets of armature windings, obtaining a high-frequency current signal of each phase through a filter, and then injectinga high-frequency square wave current signal into d axes of the two sets of armature windings to obtain q-axis high-frequency voltage response; step 3, performing amplitude extraction on the q-axis high-frequency voltage response, and substituting the amplitude into a calculation formula to calculate an average absolute value of a high-frequency response signal; and step 4, performing fault diagnosis and fault location on a motor power tube according to an open-circuit fault diagnosis and fault positioning criterion of a power tube of the fault-tolerant servo motor drive system. The fault diagnosis method of the fault-tolerant servo motor drive system provided by the invention is simple and feasible, high in reliability and short in fault diagnosis time, can accurately and effectively detect and locate open circuit faults of the power tube in the fault-tolerant servo motor drive system, and improves the stability and robustness of the motor drive system.
Description
technical field [0001] The invention relates to the field of motors, in particular to a method for diagnosing an open-circuit fault of a power tube of a fault-tolerant servo motor. Background technique [0002] With the development of multi-electric, all-electric aircraft and hybrid and pure electric vehicles, the motor drive system has ushered in new development opportunities and challenges. In addition to requiring high power density and high efficiency, it also needs to have high output performance and high reliability. performance, which has become the key to the motor drive system. In the 1990s, the emergence of fault-tolerant servo motors and their control systems improved the safety and reliability of the system, and have now been applied to the aviation field. However, affected by electromagnetic interference, insulation aging, poor contact and other factors, some electrical faults often occur in the motor and power tube in the drive system, which can generally be a...
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IPC IPC(8): G01R31/34G01R31/26G01R31/54
CPCG01R31/2642G01R31/34
Inventor 李洁高宇飞蒋雪峰夏玲芳曹超
Owner 南京众科汇电气科技有限公司