Switched reluctance motor system based on bus current sampling and winding current obtaining method thereof

Abstract

The invention discloses a switched reluctance motor system based on bus current sampling. The switched reluctance motor system comprises a switched reluctance motor, a power converter, a rotating speed detecting device, current sensors and a controller. The phase current of the SRM system is analyzed, the influence on the phase current waveform by different open sections is discussed, and the phase current overlapping and non-overlapping conditions in a current chopping section are analyzed. According to the phase current overlapping condition, high-frequency impulses are injected into all under-phase tubes in an overlapping section, A / D sampling is triggered at the pulse low level to discompose the direct-current bus current, the injection high-frequency impulse frequency and the A / D sampling frequency are highly synchronous, information of all the open sections is combined, phase currents in all the phase conducting sections can be effectively rebuilt, the use quantity of the sensors is reduced, the system cost and size are greatly reduced, the switched reluctance motor system is more compact, and the problem that as gains of the single current sensors of all the phases are unequal, voltage drop is unbalanced is solved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a switched reluctance motor system based on bus current sampling and a winding current acquisition method thereof. Background technique [0002] Switched Reluctance Motor (SRM) is a micro motor developed in the 1980s. As a new type of speed control system with simple structure, good robustness and low price, it has attracted the attention of electrical appliances in various countries soon after it came out. The widespread attention of the transmission industry has become one of the most popular speed-adjusting motors in the 1980s. After the 1990s, it has gradually formed a development trend that emphasizes both theoretical research and practical application. In recent decades, with the rapid development of electronics and microelectronics, switched reluctance motor has become a new type of controllable AC speed regulation system. Such as figure 1 As shown, the system...

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Problems solved by technology

The commonly used method is to place a current sensor on each phase winding for current sampling to obtain a more accurate sampling current (such as Figure 8 As shown), in a multi-phase switched reluctance motor, this will inevitably lead to an increase in the number of current sensors, system volume and system cost, and will also lead to problems such as unbalanced voltage drop caused by unequal gains of individual current sensors in each phase

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