Motor drive device and phase loss detection method and system thereof

Abstract

The invention, which belongs to the motor control field, especially relates to a motor drive device, and a lack-phase detection method and system. According to the method and the system, after a motor is started by a drive unit, phase currents of the motor are obtained; when one certain phase current is zero, according to the load feature of a fan, values of constants k1 and k2 are obtained by calculation based on relations between the motor torque and the rotating speed n, the current I, and the output power P and the like; the values of the constants k1 and k2 are compared with preset value taking intervals; and if the k1 or k2 is not in the corresponding preset value taking interval, the lack-phase mode of the motor is determined. Therefore, with the method and system, the result is mainly relied on the load feature of the fan; less components and parts are used; the determination process is simple and can be implemented easily; and the accuracy and reliability are high. Correspondingly, when the motor drive device uses the lack-phase detection method and system, the power supply of the motor can be detected in real time, thereby effectively guaranteeing secure operation of the motor and avoiding accidents like motor burning.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a motor drive device and a phase loss detection method and system thereof. Background technique [0002] Phase loss of three-phase or other multi-phase AC motors means that the AC power loaded on the AC motor lacks one or more phases. Phase loss can be divided into main phase loss and Hall phase loss. When a three-phase or other multi-phase motor lacks a phase, the electronic current increases sharply, and the magnetic field is severely uneven, which manifests as the motor jitters and cannot rotate normally, or the rotation is weak, the load performance of the motor decreases and the noise is loud. What's more serious is that it will lead to a short circuit of the motor, and then burn the motor due to excessive current and excessive heat generation of the motor. [0003] Therefore, no matter in the starting or running process of the AC motor, it is necessary to detect th...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is firstly to provide a motor phase loss detection method and system to solve the technical problems in the prior art that the phase loss detection method is complicated, the system structure is complicated, the cost is high, or the accuracy is not high

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