A method for initial magnetic pole position identification and disconnection detection of permanent magnet synchronous motor

Abstract

The invention discloses a method for identifying the initial magnetic pole position and detecting wire breakage of a permanent magnet synchronous motor. An incremental encoder with UVW magnetic pole signals is installed coaxially with the rotor of the permanent magnet synchronous motor, and outputs U, V and W signals to select module, and output A, B, Z three-phase differential signals to MAX14891E module, MAX14891E module converts A, B, Z three-phase differential signals into three-phase single-ended signals DA, DB, DZ output to PFGA module, and outputs three The open-circuit and short-circuit fault detection results FLT_A, FLT_B and FLT_Z of the differential signal are sent to the gating module, and the gating module selectively outputs U, V, W signals and the open-circuit and short-circuit fault detection results FLT_A, FLT_B, FLT_Z to the PFGA module, and the FPGA module The initial position of the rotor of the permanent magnet synchronous motor is located, and the real-time speed and direction of the permanent magnet synchronous motor are analyzed. The invention realizes the initial magnetic pole position identification and disconnection detection functions of the permanent magnet synchronous motor, and relieves the feedback circuit of the permanent magnet synchronous motor. The problem of consuming more FPGA external interface.

Description

technical field [0001] The invention relates to the field of servo control of a permanent magnet synchronous motor, in particular to a method for identifying the initial magnetic pole position and detecting wire breakage of the permanent magnet synchronous motor. Background technique [0002] With the continuous progress of science and technology and the rapid development of power electronics technology, permanent magnet synchronous motors are widely used in various applications requiring high response, high precision and wide speed regulation due to their high efficiency, high power density and low loss. High-performance servo control systems, such as robots, turntables, electric vehicles and other fields. In order to realize the control of a high-performance servo system, the position of the motor rotor needs to be detected for field orientation and speed control. Incremental encoder with UVW magnetic pole signal is a sensor that converts rotational displacement into digi...

AI Technical Summary

Problems solved by technology

[0003] In the control occasion where the incremental encoder is used as the feedback loop, the disconnection of phase A, phase B or phase Z may cause control difficulties or even control errors, which may cause mechanical damage or casualties in severe cases. Line detection is very important for servo control system

Images