Three-phase three-wire system switched reluctance motor driving system, control method and application

Abstract

The invention belongs to the technical field of magneto-electro-mechanical integration based on power electronics and microcomputer control technologies, and discloses a three-phase three-wire systemswitched reluctance motor driving system, a control method and an application. A switched reluctance motor stator is arranged, the switched reluctance motor stator is provided with n stator salient poles, and each salient pole is wound with an independent salient pole coil; the three-phase full-bridge power conversion circuit consists of six switching tubes and is connected with a direct-current power supply; and the controller is used for controlling the six switching tubes in the three-phase full-bridge power conversion circuit to be switched on or off. The system is advantaged in that a three-phase full-bridge type power conversion circuit topological structure composed of six switching tubes is adopted, motor windings are connected in a star-shaped or triangular connection mode according to a certain magnetic pole sequence, and three connecting wires are led out. Compared with a structure adopting 12 switching tubes, power elements are reduced by one time, and production cost is reduced; the system is compatible with a conventional industrial universal three-phase three-wire wiring method, and greatly improves universality and usability.

Description

technical field [0001] The invention belongs to the technical field of magnetomechanical integration based on power electronics and microcomputer control technology, and in particular relates to a three-phase three-wire switched reluctance motor drive system, a control method and an application. Background technique [0002] At present, switched reluctance motors are widely recognized by the industry due to their high reliability, good energy-saving effect, and relatively low motor cost. For the topological structure of the power conversion circuit of the switched reluctance motor driver, an asymmetric bridge power conversion circuit is currently used for current conversion. The controller needs to use 12 switching tubes to independently control the three-phase windings of the motor. This control method needs to use more power components, which increases the manufacturing cost. In this control method, the two ends of each phase winding need to be connected to the driver at...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing switched reluctance motor driver power conversion circuit needs to use more power components, which increases the manufacturing cost

[0005] (2) The existing switched reluctance motor driver power conversion circuit is not compatible with the 3-phase 3-wire wiring method commonly used in the industry, and the versatility is not good

[0006] (3) Due to the independent control of the phase windings, a large radial force will be generated at the moment of excitation shutdown, which will increase the noise of the motor

[0007] The difficulty in solving the above problems and defects is: because the flux linkage of the switched reluctance motor is highly nonlinear, the characteristics of the flux linkage will change greatly with different excitation methods. The windings are excited to generate torque at the same time. It is necessary to analyze the flux linkage formed by the two-phase winding. The flux linkage characteristics have changed greatly compared with the single-phase excitation control mode of 6-wire control. The controller software needs to match the flux linkage characteristics to achieve better working condition

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