AC motor control device and control method

Abstract

The invention provides an AC motor control device and a control method. The device comprises a phase sequence matching determination part, a shaft multiple detection part and a normality/anomaly detection part, wherein in first determination processes, the phase sequence matching determination part determines whether an instruction rotating direction provided by an AC motor operation instruction is consistent with a detection rotating direction obtained according to output signals of a rotating voltage transformer; in second determination processes, when that the instruction rotating direction is consistent with the detection rotating direction is determined, whether the instruction rotating direction is consistent with an actual rotating direction is determined; when that the instruction rotating direction is consistent with the actual rotating direction is determined, a shaft multiple is detected according to the output signals of the rotating voltage transformer; the normality/anomaly detection part, according to the determination results of the phase sequence matching determination part, detects the phase sequence of voltage applied on the AC motor or output wire distribution of the rotating voltage transformer are normal/abnormal; in third determination processes, the normality/anomaly detection part determines whether the shaft multiple detected by the shaft multiple detection part is matched with a magnetic pole number of the AC motor.

Description

technical field [0001] The invention relates to a control device for variable-speed operation of an AC motor by using information fed back by a rotation angle detection sensor such as a resolver. More specifically, it relates to a device capable of judging whether the rotation direction of the AC motor detected by the rotation angle sensor, the actual rotation direction, the rotation direction of the operation instruction, and the direction desired by the user are consistent, and detecting the phase of the voltage applied to the AC motor. The sequence and the wiring of the output line of the rotation speed sensor are normal / abnormal AC motor control device and control method. Background technique [0002] As a rotation angle sensor of an AC motor, a pulse encoder or a resolver is commonly used. A pulse encoder generally outputs pulses of phase A, phase B, and phase Z. Since the A-phase pulse and the B-phase pulse have a 90-degree phase difference, the rising and falling ti...

AI Technical Summary

Problems solved by technology

[0005] In the case of vector control of an AC motor using a rotation angle sensor, if the U, V, and W phase wiring (voltage phase sequence) of the power line of the three-phase AC voltage is applied to the AC motor, or the output line of the rotation angle sensor ( If the wiring of the output line) is wrong, for example, the rotation speed detected by the rotation angle sensor will become a negative number relative to the actual rotation speed, resulting in failure to control and causing the motor to lose control

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