A Practical Torque Estimation Method for Interior Permanent Magnet Synchronous Machine in Electric Vehicles

<div><p>The torque output accuracy of the IPMSM in electric vehicles using a state of the art MTPA strategy highly depends on the accuracy of machine parameters, thus, a torque estimation method is necessary for the safety of the vehicle. In this paper, a torque estimation method based on flux estimator with a modified low pass filter is presented. Moreover, by taking into account the non-ideal characteristic of the inverter, the torque estimation accuracy is improved significantly. The effectiveness of the proposed method is demonstrated through MATLAB/Simulink simulation and experiment.</p></div

Specifications of IPMSM.

<p>Specifications of IPMSM.</p

Experimental Setup.

<p>Experimental Setup.</p

Flux Estimator with Compensated MLPF.

<p>Flux Estimator with Compensated MLPF.</p

Experimental Results.

<p>Experimental Results.</p

Torque Estimation Results at 600rpm with a Measured Torque of 100Nm.

<p>Torque Estimation Results at 600rpm with a Measured Torque of 100Nm.</p

Proposed Torque Estimator with Reference Voltage Correction and Compensated MLPF.

<p>Proposed Torque Estimator with Reference Voltage Correction and Compensated MLPF.</p

Torque Estimation Results with the Reference Current iq* = 200A and the Reference Current id* = 0A at 600rpm.

<p>Torque Estimation Results with the Reference Current </p><p></p><p></p><p></p><p><mi>i</mi><mi>q</mi><mo>*</mo></p><p></p><p></p><p></p> = 200A and the Reference Current <p></p><p></p><p></p><p><mi>i</mi><mi>d</mi><mo>*</mo></p><p></p><p></p><p></p> = 0A at 600rpm.<p></p

Torque Estimation Results at 2000rpm with a Measured Torque of 50Nm.

<p>Torque Estimation Results at 2000rpm with a Measured Torque of 50Nm.</p

Torque Estimation Method with Pure Integrator.

<p>Torque Estimation Method with Pure Integrator.</p