Abstract
Monitoring of rotor temperature in permanent magnet synchronous machines (PMSM) is of great importance as high temperature could cause partial or even irreversible demagnetisation of the permanent magnets (PMs). Rotor temperature measurement unfortunately is particularly difficult in practice, since it is difficult to access temperature sensors on a rotating shaft. Nevertheless, rotor temperature can be obtained indirectly with the information of rotor magnet flux linkage, as PM remanence decreases with rotor temperature. Here, a simple and relatively accurate method for online estimation of PM flux linkage is presented, based on the measurement of current response to the standard space-vector pulse width modulation (SV-PWM). This method uses the already-existing PWM voltage as the excitation signal in order to avoid any form of signal injection which produces undesirable disturbance to the system. Knowledge of machine parameters, such as inductances which may vary due to saturation, is not required. The proposed methodology has been verified in real-time simulation.
Highlights
Permanent magnet synchronous machines (PMSMs) are widely popular in servo and traction applications due to their high torque and power density
The use of rotor flux linkage model-based observer is proposed in [2,3,4,5] using the fact that (NeFeB) permanent magnets (PMs) loses 0.11–0.12% remanence per one degree Celsius temperature rise
By utilising a zero-voltage injection scheme, flux linkage is directly determined with the measurement of the average value of the voltage commands which are the output of current loop PI controllers of the standard fieldoriented control at different rotor speed [7]
Summary
Permanent magnet synchronous machines (PMSMs) are widely popular in servo and traction applications due to their high torque and power density. The use of rotor flux linkage model-based observer is proposed in [2,3,4,5] using the fact that (NeFeB) PM loses 0.11–0.12% remanence per one degree Celsius temperature rise This method is difficult to apply practically, because of the necessity of a precise modelling for motor and inverter — the model-related errors otherwise will be misinterpreted as temperature changes. By utilising a zero-voltage injection scheme, flux linkage is directly determined with the measurement of the average value of the voltage commands which are the output of current loop PI controllers of the standard fieldoriented control at different rotor speed [7] In both methods, the dq-axis inductance terms are cancelled during the derivation of the methods, resulting in a parameter-independent estimation. The estimation errors in different operating conditions are evaluated and shown to be relatively small
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