Low-cost detection system and method of winding current of switching reluctance motor

Abstract

The invention discloses a low-cost detection system and method of winding current of a switching reluctance motor. The low-cost detection system comprises a switching reluctance motor, an improved asymmetric semi-bridge converter, a rotor position detection device, a current sensor and a controller; different working modes, caused by the fact that conducting ranges are different, of the winding current of two adjacent phases of stators are analyzed; conditions that the winding current of the two adjacent phases of stators has an overlapping interval and does not have the overlapping interval are discussed, and an improved asymmetric semi-bridge converter topology is provided; and the quantity of electronic devices is reduced, and the winding current of each phase of the stator can be reconstructed through only one current sensor without any voltage loss. According to the low-cost detection system and method, the volume and cost of a motor system are reduced, the system is more compact, and the reliability of the motor performance is extremely improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a low-cost switched reluctance motor winding current detection system and a method thereof. Background technique [0002] With the increasing energy crisis and environmental pollution, the research on electric vehicles has gained vitality and has become one of the hot spots in the development of the automotive industry worldwide. Electric vehicles do not use gasoline as direct fuel, have high energy utilization efficiency, low environmental pollution, and have the advantages of high efficiency and low emissions. At the same time, the torque response of electric vehicles is fast, the acceleration is fast, and it is easy to realize four-wheel independent drive and four-wheel steering. It can also realize regenerative braking and energy recovery. The safety and reliability of electric vehicle braking are high, and are widely recognized by domestic and foreign scholars. s...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of increased system volume, increased cost and reduced system reliability caused by multiple current sensors in a multi-phase switched reluctance motor system, the present invention provides a low-cost switched reluctance motor winding current detection system and The method is appropriately improved on the basis of the traditional asymmetrical half bridge, while reducing the number of electronic devices, only one current sensor is needed to sample the bus current, and then combined with the judgment of the conduction interval of the stator winding of each phase, the present invention is used The proposed new current reconstruction scheme realizes the decomposition of the bus current and achieves the purpose of reconstructing the current of each phase

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