Permanent-magnet brushless DC motor with self-noise immunity rotation velocity control circuit

Abstract

The invention discloses a permanent magnet brushless DC motor provided with a self anti-interference speed control circuit. The structure of the invention comprises a stator, a rotor and the speed control circuit, wherein, the speed control circuit consists of a tachogenerator, an A/D converting circuit, a digital pulse-width modulation circuit, a logic time delay circuit, a power amplifier drive circuit, an inverter circuit and a digital control circuit; the input end of the digital control circuit is orderly connected with the A/D converting circuit and the tachogenerator in series, and then to the rotor end of the permanent magnet brushless DC motor; the output end of the digital control circuit is orderly connected with digital pulse-width modulation circuit, the logic time delay circuit, the power amplifier drive circuit and the inverter circuit in series, and then to the stator end of the permanent magnet brushless DC motor. The invention has the advantages that: the invention can estimate external disturbance and compensate through feedback, reduce the effect of the external disturbance to the permanent magnet brushless DC motor, improve the dynamic performance of the motor, and reinforce the stability and reliability.

Description

Technical field: [0001] The invention relates to a permanent magnet brushless DC motor, in particular to a permanent magnet brushless DC motor with an automatic disturbance rejection speed control circuit. Background technique: [0002] With the rapid development of power electronics technology, microelectronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet brushless DC motors have been rapidly promoted. Due to its small size, good performance, simple structure, high reliability, and large output torque, permanent magnet brushless DC motors have received extensive attention. The speed control system is one of the main devices to ensure that the brushless DC motor runs at a predetermined speed. [0003] FIG. 1 is a connection block diagram of a speed control circuit of a permanent magnet brushless DC motor in the prior art. [0004] As shown in Figure 1, the prior art permanent magnet brushless DC motor speed control circui...

AI Technical Summary

Problems solved by technology

[0005] The proportional, integral and differential controller 7 of the above-mentioned prior art permanent magnet brushless DC motor speed control circuit adopts a single-chip microcomputer to realize the above-mentioned algorithm, and its defect is: the disturbance resistance to the permanent magnet brushless DC motor 8 is poor, so that the permanent magnet has no The brushed DC motor cannot recover to the rated speed after a large disturbance

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