Permanent magnet synchronous motor permanent magnet temperature and magnetic field real-time on-line detection device and application

Abstract

A permanent magnet synchronous motor permanent magnet temperature and magnetic field real-time on-line detection device and application thereof are disclosed. The device comprises: a sensor unit including an FPC board and a plurality of temperature sensors and a plurality of magnetic field sensors arranged on the FPC board, the position where the permanent magnet is connected with the rotor core is slotted along the axial direction of the rotor core, and the FPC board is fixed in the slot, a plurality of temperature sensors and a plurality of magnetic field sensors are respectively distributedalong the axial direction of the rotor core and are in contact with the permanent magnet; The signal acquisition and processing unit is fixed on the motor shaft, receives and processes the electric signal of the sensor unit, and wirelessly transmits the data to the upper computer. Compared with the prior art, the invention solves the problems of the installation of the sensor on the rotor and thedata transmission under the electromagnetic environment, as well as the measurement of the temperature and the magnetic field distribution of the permanent magnet, and realizes the continuous measurement of the temperature and the magnetic field distribution on the surface of the permanent magnet by the multi-sensors under various online working conditions of the permanent magnet motor.

Description

technical field [0001] The invention relates to the technical field of motor heat and magnetic field detection, in particular to a real-time on-line detection device for permanent magnet temperature and magnetic field of a permanent magnet synchronous motor. Background technique [0002] Changes in temperature and external magnetic field will cause changes in the magnetic properties of permanent magnets. High-density permanent magnet motors are small in size, strong in armature reaction, and high in heat flux, which makes the permanent magnets in the motor have the risk of irreversible demagnetization, especially NdFeB permanent magnet materials. , the Curie temperature is relatively low, and irreversible demagnetization may occur under the action of high temperature and armature reaction. Therefore, mastering the temperature distribution and magnetic properties of permanent magnets in various operating conditions of permanent magnet motors is of great value to ensure safe a...

AI Technical Summary

Problems solved by technology

Contact measurement must solve the transmission of temperature data in the rotating state. It is connected by a special measurement slip ring. The disadvantage is that it increases the complexity of manufacturing, and the slip ring is prone to signal instability due to mechanical movement and poor contact of carbon brushes.

Non-contact measurement mainly includes photoelectric temperature measurement method and infrared temperature measurement method. This type of measurement method needs to install temperature-sensitive elements on the part where the stator faces the rotor, and requires a certain installation space. It is not suitable for high-density permanent magnet motors with small and medium power vehicles.

At the same time, the temperature and external magnetic field conditions of the permanent magnet are unevenly distributed in the axial direction, and the temperature and magnetic field distribution of the permanent magnet cannot be obtained only through the shaft end or a measuring point in the middle.

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