A permanent magnet synchronous motor with a disc type double redundancy structure and its control method

Abstract

The invention discloses a disc-type dual-redundancy structure permanent magnet synchronous motor, which comprises a shell body, a motor shaft, a first end part rotor, a first stator, an intermediate rotor, a second stator and a second end part rotor, wherein the shell body comprises an upper end cover, a lower end cover, a first side end cover and a second side end cover; the first end part rotor and the second end part rotor are of the same structure, and each comprise an end part permanent magnet mounting frame, a plurality of end part permanent magnets and a magnetic yoke; the intermediate rotor comprises an intermediate permanent magnet mounting frame, a plurality of intermediate permanent magnets and an intermediate permanent magnet pressing plate; and the first stator and the second stator are of the same structure, and each comprise a stator disc, a coil winding and a plurality of stator disc pressing plates. The invention further discloses a control method of the disc-type dual-redundancy structure permanent magnet synchronous motor. The disc-type dual-redundancy structure permanent magnet synchronous motor is novel and reasonable in design and convenient in implementation, reduces iron loss, improves efficiency, is low in vibration noise, eliminates the cogging effect, is high in operating reliability, has wide application prospect, and has high popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a permanent magnet synchronous motor with a disc-type double redundancy structure and a control method thereof. Background technique [0002] In traditional motors, the magnetic field of the motor is generated by current. In order to reduce the reluctance of the magnetic circuit, the stator and rotor cores are made of laminated silicon steel sheets, which are heavy (the core weighs about 60% of the total weight), large in size, and loss Large (core loss accounts for 20% to 30% of the total loss), large vibration and noise (core teeth and slots are the main source of noise), low efficiency, large moment of inertia, slow response speed, and when the motor is running, due to the gear The groove effect will produce electromagnetic torque ripple. In addition, the traditional motor has only one set of windings. When the motor winding has a short circuit or phase loss fault,...

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Problems solved by technology

[0005] a) Series redundancy structure: The driving subsystem composed of two independent permanent magnet synchronous motors is a typical series redundancy structure. The structure of the motor in this redundancy mode is exactly the same as that of a single motor. Completely isolated, there is no electromagnetic coupling in redundant control, so the control strategy is simple; but this redundant system has a large volume and weight, and the long-axis connection mode between redundant motors is very easy to amplify torque disputes, resulting in shaft distortion and deformed, even broken

[0006] b) Parallel redundancy structure: The electrical dual redundancy steering gear actuation system designed by Shuangxia Niu et al. adopts a classic parallel redundancy structure. The two sets of windings are driven and controlled by independent circuits. When a channel fails , the other channel continues to work; but there is electromagnetic coupling between the two sets of windings, which increases the complexity of the control, and more importantly, when a channel fails, it is difficult for the system to isolate it

[0007] c) Fault-tolerant redundancy structure: Nicola Bianchi et al. proposed a new multi-stage double-redundancy motor structure. The stator is divided into two parts: the outer stator and the inner stator. The outer stator adopts fractional slot concentrated winding to reduce the number of slots and the stator yoke Weight, the inner stator adopts a salient pole structure to increase the winding space of the winding; the permanent magnet synchronous motor with this structure is suitable for low-speed high-torque systems, which can improve the flexibility of system control and the fault-tolerant performance of the motor, but the structure of the motor is complex , difficult to process

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