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A Torque Compensation Method Considering Temperature Variation of SPMSM

  • Jung, Tae-Uk (Department of Electrical Engineering, Kyungnam University) ;
  • Park, Chang-Seok (Department of Electrical Engineering, Kyungnam University)
  • Received : 2017.05.02
  • Accepted : 2017.08.14
  • Published : 2018.01.01

Abstract

This paper analyzed the effect of temperature on the permanent magnet flux and output torque. The major parameter which will impact the torque control accuracy of a surface mounted permanent magnet motor is the variation of the permanent magnet temperature. In addition, the temperature variation of the permanent magnet will also influence the maximum torque per ampere of the motor. To analyze the effect of temperature on the permanent magnet, the rotor of the motor was directly heated to measure the temperature and the permanent magnet flux was measured. As a result, the output torque of the motor decreases as the temperature of the rotor permanent magnet increases. Therefore, this paper proposes a technique to compensate the phase current of the motor by estimating permanent magnet flux, and it is proved through theoretical basis and several experiments.

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Fig. 1. B-H curves of the NP-8R 6kOe bonded NdFebmagnet

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Fig. 2. Demagnetization ratio curves of the NP-8R 6kOebonded NdFeb magnet according to temperature

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Fig. 3. MTPA curve of SPMSM

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Fig. 4. Magnetic flux linkage observer

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Fig. 5. Block diagram of the proposed torque compensation algorithm

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Fig. 6. Frequency response characteristics of flux observer

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Fig. 7. Experimental Measurement of the Permanent-Magnet (PM) Temperature of the Test SPMSM

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Fig. 8. Variation of BEMF by temperature

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Fig. 9. Experimental test setup

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Fig. 10. Output waveform with variable torque load atroom temperature. (A) load torque : 10[mNm], (B)load torque : 127[mNm]

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Fig. 11. Output waveform with variable torque load at100[¡ÆC]. (A) load torque : 10[mNm], (B) loadtorque : 127[mNm]

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Fig. 12. Output waveform with variable torque load at100[¡ÆC]. (A) load torque : 10[mNm], (B) loadtorque : 127[mNm]

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Fig. 13. Output waveform of motor performance tester. (A)22 [¡ÆC], (B) 100 [¡ÆC], and (C) (A) vs. (B)

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Fig. 14. Output waveform of motor performance tester at100[¡ÆC]

Table 1. The properties of a SPMSM drive parameter

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Acknowledgement

Supported by : Kyungnam University

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