Torque ripple suppression method of brushless direct current motor

Abstract

The invention provides a torque ripple suppression method of a brushless direct current motor. The torque ripple suppression method is used for performing direct torque control of the brushless direct current motor which is combined with discrete type space voltage vector modulation. The torque ripple suppression method comprises the following steps of step 1, detecting counter electromotive force of the brushless direct current motor; step 2, establishing a composite state of an inverter switch and a direct torque control sector system; and step 3, establishing selection of basic voltage space vectors in a system sector to achieve torque ripple suppression. The torque ripple suppression method of the brushless direct current motor has the advantages of being rapid in dynamic response, enabling a structure to be simple, having good suppression effect on torque ripple, greatly improving the performance of the direct torque control of the brushless direct current motor and broadening the applications.

Description

technical field [0001] The invention relates to the field of brushless DC motors, in particular to a method for direct torque control of brushless DC motors using discrete voltage space vector modulation. The method combines the sectoral characteristics of brushless DC motors and specifically designs multi-level Vector modulation, so as to reasonably increase the number of basic vectors participating in the modulation, and perform control vector synthesis to obtain the best control vector to suppress the torque ripple generated by direct torque control. Background technique [0002] The brushless DC motor is composed of the motor body and the driver. It has a simple and compact structure. There is no brush part of the traditional motor. The rotor part uses permanent magnet materials, and the current through the corresponding sequence of the stator winding can make the rotor rotate forward or reverse. The brushless DC motor has high efficiency, large high-efficiency area, hig...

AI Technical Summary

Problems solved by technology

Place the off-phase voltage on the z-axis perpendicular to the abc plane, so that the voltage vector and the stator flux linkage run in three-dimensional space, thereby controlling the operation of the motor. This control method does not require rotor position information and is easy to implement sensorless control, but this This control method is relatively complex and difficult to implement, especially when using MCU, the calculation is complex, the hardware and software requirements of the digital control system are strict, and industrial applications are difficult

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