A split-phase winding of a permanent magnet brushless motor and its control method

Abstract

The invention discloses a split-phase winding of a permanent-magnet brushless motor and a control method of the split-phase winding, belonging to the technical field of combination of a mechanical body and a control fork of the motor. The split-phase winding is formed by splitting phases of integer-groove windings of which the groove quantity of each pole and each phase is more than or equal to 2 and extracting a group of coils in each phase distribution coil of the motor for many times phase by phase, no less than two inverter are respectively accessed to many sets of motor windings with same quantity and independent to one another, each inverter can separately control each independent set of motor winding according to a certain rule, and the flexibility of control and algorithm is achieved, and meanwhile, fault-tolerant of the motor winding during open circuit or short circuit is achieved; and on the condition of control current, the harmonic component entering a rotor is substantially reduced.

Description

technical field [0001] The invention discloses a split-phase winding of a permanent magnet brushless motor and a control method thereof, and belongs to the technical field of cross-combination of the mechanical body and control of the motor. Background technique [0002] Currently widely used AC synchronous motors or asynchronous motors generally have only one set of star-connected or delta-connected motor windings, and the inside of the motor windings can be one or more branches. When a local short circuit or open circuit occurs due to aging and other reasons, the motor is in a fault state, and in most cases the output drops sharply, and even serious accidents occur. A motor with a single set of windings electrically connected generally cannot guarantee a reduced required output, and it is difficult to guarantee the minimum task requirements under fault conditions. [0003] Existing motors with multiple sets of independent windings often use the following methods to achiev...

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Problems solved by technology

[0004] However, if multiple motor stator cores (including windings) share one rotor, since the multiple stator cores are independent, the space for the connecting wires at the ends of the windings will occupy more space in the axial direction of the motor, and the power density of the motor will be greatly reduced.

[0005] Although the previous single-stator multi-winding fault-tolerant motor has various forms, in essence, the position layout and winding method of its multiple sets of windings are to ensure that the windings are not coupled or less coupled to each other, so the motor needs Provide more tooth and yoke space to provide independent magnetic circuits, in order to achieve fault-tolerant operation, the volume and weight of the motor need to be greatly increased

[0006] The reported single-stator multi-winding fault-tolerant motor has a fractional number of slots per pole and a large number of rotor poles, and is driven and controlled by a sine wave, which cannot achieve the effect of independent control after the winding space is split. In specific applications, especially high-speed motors There are limitations in the application

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