Hak-Jun Lee and Seung-Ki Sul Power Electronics Laboratory

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Presentation transcript:

Control Strategy for an Interior Permanent Magnet Synchronous Motor : A Survey Hak-Jun Lee and Seung-Ki Sul Power Electronics Laboratory Seoul National University, Korea Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Contents Introduction Basic Study for the Control Strategy Recent Study for the Control Strategy Torque Control Strategy of an IPMSM Considering the Flux Variation of the Permanent Magnet Novel Flux-Weakening Control of an IPMSM for Quasi Six-Step Operation Future Work for the Control Strategy Conclusions Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Introduction IPMSM High Efficiency High Power Density Wide Flux-Weakening Region  Too Complex To Control !! Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Basic Study Mathematical Model Voltage Equation Torque Equation Torque due to Flux of PM Reluctance Torque Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Basic Study Operation Region Current Limit Circle Voltage Limit Ellipse MTPA Maximum Torque Per Ampere MFPT Minimum Flux Per Torque Current Increasing Flux Increasing Current Increasing Flux Increasing Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Basic Study Flux-Weakening Operation For Extended Torque Control Capability Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Basic Study Control Diagram Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (1) Torque Variation due to Temperature Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (1) Changing of the Current Ref. MTPA, MFPT and Torque Curve is changed Without temperature compensate algorithm, real torque will be reduced at higher temperature Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (1) Interpolation of the Current ref. Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (1) Control Diagram Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

 Torque error is reduced Recent Study (1) Experimental Result Motor at 70 [℃], Ref. table at 30 [℃]  Proposed method  Torque error is reduced Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (2) Problem of the Basic Study Voltage Limitation Less Torque than Six-Step Operation Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (2) Problem due to the Changing Voltage Limitation Confliction between the anti-windup and flux-weakening control Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (2) Control Diagram No Anti-Windup Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Recent Study (2) Experimental Result The Capability curve represents larger torque than basic method Quasi six-step operation and the current regulation are worked simultaneously Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Future Work Defects of the control method Hard to set the gains of the closed-loop controller Hard to make the Lookup tables Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Conclusions Basic Study for the Control of IPMSM IPMSM are widely used due to their wide flux-weakening region Basic Study was presented which has the ability to control the output torque precisely over a wide speed region Recent Study for the Control of IPMSM Torque varies with the temperature, so the control method was presented considering the flux variation of IPMSM There is confliction between the anti-windup and flux-weakening control, so the control method was presented for the quasi six-step operation Future Work for the Control of IPMSM Because it is hard to set the gains of the closed-loop controller and to make pre-calculated lookup table, future work will be the control algorithm for the IPMSM without any tables Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr

Thank You For Your Attention Power Electronics Laboratory, Seoul National University http://eepel.snu.ac.kr