Double salient-pole motor drive power tube fault diagnosis method

A double-salient motor and diagnosis method technology, which is applied in the direction of motor generator testing, instrumentation, and electrical measurement, can solve the problems of increased hardware cost, complexity, and rapidity not as good as the first category, so as to prevent motor failure and improve reliability effect

Inactive Publication Date: 2007-11-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

In many literatures, there have been researches on the fault diagnosis of power tubes of full-bridge converters, which can be roughly divided into two types. One is to realize fault diagnosis by detecting the voltage change of the lower tube of the bridge arm. This method is simple and fast, but it needs Adding three additional voltage sensors increases hardware cost and complexity; the other is to compare the sampled operating current value wi

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  • Double salient-pole motor drive power tube fault diagnosis method
  • Double salient-pole motor drive power tube fault diagnosis method
  • Double salient-pole motor drive power tube fault diagnosis method

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Embodiment Construction

[0023] The conduction logic of the power tube of the main power circuit of the doubly salient pole motor is the first and sixth power switch tube T 1 T 6 →Third and second power switch tube T 3 T 2 → Fifth and fourth power switch tube T 5 T 4 →The first and sixth power switch tubes T 1 T 6 →..., that is, in each state, one bridge arm upper tube and the other bridge arm lower tube and the corresponding two-phase motor windings are connected in series, and the control methods of the two power tubes working at any time can be divided into single-cutting There are two kinds of pipes (cutting the upper pipe or cutting the lower pipe) and cutting double pipes. With the first and sixth power switch tubes T 1 T 6 Turn on logic and cut-off transistors in the first power switch tube T 1 For example, at this time the first power switch tube T 1 The corresponding current situation when on and off is shown in Figure 2. It can be seen that under each conduction logic, two-phase mo...

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Abstract

The invention relates to a diagnosis method for power transistor of doubly salient motor driver, belonging to the fault diagnosis method for power device in motor driving system. In the method three-phase current sensor is set on three-phase bridge arm; while three-phase current is measured the measurement for current signal of current reflowing is added; after current reflowing signal is treated digitally and driving signal of power transistor is combined on-line fault measurement and diagnosis for main power circuit are realized. The invention is provided with simple realization and good rapidity. Not only open fault of power transistor can be diagnosed quickly but also it can play a better protecting effect for bridge-arm direct phenomenon maybe generated by short circuit of power transistor. At the same time it provides a feasible method for fault diagnosis of motor driving system based on full-bridge converter.

Description

1. Technical field [0001] The invention relates to a fault diagnosis method for a power tube of a double salient motor driver. 2. Background technology [0002] The doubly salient pole motor is composed of permanent magnets or field windings embedded in the stator of the switched reluctance motor. It has the advantages of simple structure, flexible control, high power density and good high-speed performance. In the entire motor drive system, the power device of the main power converter is the weak link most prone to failure. After the failure, the motor will work in an unbalanced state, which will not only have a certain impact on the stability of the entire system, but also may burn the motor. series of serious consequences. Therefore, the real-time online fault detection and diagnosis of the main power converter becomes the key to improve the reliability of the whole system. [0003] The main power circuit of the doubly salient motor is similar to other brushless machine...

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Application Information

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IPC IPC(8): G01R31/34G01R31/06
Inventor 尹航周波魏佳丹胡朝燕
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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