Signal injection-based online estimation method for temperature of stator winding of PMSM

Abstract

The invention discloses a signal injection-based online estimation method for temperature of a stator winding of a PMSM, relates to the technical field of motors and aims at solving the problem that the utilization rate of a drive motor is limited to a certain extent by a traditional method for cooling the drive motor. According to the main points of the technical scheme, the method comprises thefollowing steps of building of a PMSM mathematical model; a signal injection strategy, injecting a DC voltage signal into the built PMSM mathematical model; vector control, carrying out vector controlon the injected DC voltage signal to obtain a phase voltage DC component UDC and a phase current DC component IDC; DC component extraction, extracting the phase voltage DC component UDC and the phasecurrent DC component IDC; stator resistor calculation, calculating a resistance value RS of a stator resistor; and temperature estimation, calculating a temperature value TS of the stator winding according to the calculated resistance value RS of the stator resistor. The signal injection-based online estimation method has the effects that the warming condition of the drive motor is accurately andefficiently monitored and the utilization rate of the drive motor is improved.

Description

technical field [0001] The invention relates to the technical field of motors, more specifically, it relates to an online estimation method for PMSM stator winding temperature based on signal injection. Background technique [0002] As the core component of the electric drive system and an important power output source, the drive motor is an important part of the electric vehicle. On the one hand, the motor output and regenerative power required by electric vehicles continue to increase to meet the needs of different models in different working conditions; Dimensional development. Among them, the permanent magnet synchronous motor (PMSM) has many advantages such as small size, light weight, high efficiency, wide speed range, high power density, and fast dynamic response. It is especially suitable for electric vehicles and their drive systems, and has become the current research and application hotspots. [0003] The operating conditions of electric vehicles are complex, a...

AI Technical Summary

Problems solved by technology

[0004] The traditional method of cooling the drive motor reduces the damage of the stator winding by high temperature to a certain extent, but also limits the utilization of the drive motor to a certain extent

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