Switch reluctance motor system based on double-bus split current sampling

Abstract

The invention discloses a switch reluctance motor system based on double-bus split current sampling. On the basis of a traditional asymmetric half-bridge converter, an upper bus and a lower bus are split and connected, and two current sensors are adopted to respectively detect the current information of the upper bus and the current information of the lower bus. One bus current comprises current information of two phases, and the other bus current comprises current information of the other two phases. By combining the turn-on interval information of each phase winding, the excitation current in each phase conduction interval can be effectively obtained, and therefore current control is carried out. The excitation current of each phase winding in the turn-on interval can be detected by onlytwo current sensors, and the number of current sensors traditionally used is reduced by one half. According to the scheme, pulse injection is not needed for each phase and extra hardware equipment isnot needed. The excitation current of each phase can be obtained directly according to the double-bus sampling current and the turn-on information of each phase. The method is simple and reliable andis easy to implement.

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 double-bus split current sampling. Background technique [0002] The switched reluctance motor is a new type of motor. Compared with the traditional AC motor, it has a series of advantages such as simple and firm structure, large starting torque, wide speed range, high efficiency, and good high-speed performance. There is no winding on the rotor of the motor, and there is a concentrated winding on the stator. The stator and rotor are all made of silicon steel sheets. Compared with traditional permanent magnet motors, switched reluctance motors can maintain high performance at very high speeds. Therefore, the switched reluctance motor is a very competitive motor that can be widely used in industries. Such as figure 1 As shown, the switched reluctance motor system is composed of a switched reluctance motor, a power converter...

AI Technical Summary

Problems solved by technology

For multi-phase switched reluctance motors, it will inevitably lead to an increase in the number of current sensors, system volume and system cost

At the same time, if only one bus current sensor is used for phase current reconstruction, high-frequency pulse injection must be used, which will inevitably lead to a series of negative effects such as voltage loss, current distortion, and efficiency reduction.

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