Variable structure driving topology

Abstract

A variable structure driving topology comprises an H bridge set (40), a power switch set (50) and a power set (60). Assuming that the phase number of an open winding motor is 3*N+3, wherein N is larger than or equal to 1, the power set (60) comprises N+1 direct-current power sources (61), and each direct-current power source (61) is provided with a positive output terminal and a negative output terminal; the power switch set (50) comprises 4N+4 power switches (51); the H bridge set (40) comprises 4*(3*N+3) power tubes (41) which form 3*N+3 H bridges (42); a left bridge arm and a right bridge arm of each H bridge are distinguished with the open winding motor as the boundary, each bridge arm is formed by series connection of drain electrodes and source electrodes of two power tubes, and binding posts (43) are arranged between the drain electrodes and the source electrodes and connected with terminals of windings of the open winding motor; the three H bridges connected with the three-phase winding terminal of the open winding motor form a set, and the power of the three H bridges is supplied by the same direct-current power source.

Description

technical field [0001] The invention relates to the field of motor drive control, in particular to a variable structure drive topology. Background technique [0002] In the motor drive, the topology of the driver generally adopts a three-phase full-bridge structure, that is, six power tubes form three bridge arms, and the middle point of each bridge arm is connected to each phase winding terminal of the motor. The advantage of this topology is that the number of power devices is small, the volume is small, and the cost is low, but its disadvantages are also very obvious. Only one of the power tubes fails, and due to the constraint that the sum of the three-phase currents is zero, the other five power tubes Tubes will not work properly, so this topology is inflexible and cannot be reconfigured after a failure. [0003] In open winding motor drives, the driver generally adopts an independent H-bridge structure, that is, the two terminals of each phase winding are all led out ...

AI Technical Summary

Problems solved by technology

Although this independent H-bridge structure overcomes the shortcomings of the three-phase full-bridge structure, it has certain flexibility and can perform fault reconstruction, but its structure is fixed and cannot better meet the wide range of use of the motor system. Requirements, such as high speed, low speed, light load, heavy load, fault and other working conditions

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