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Magnet Temperature Estimation in Surface PM Machines During Six-Step Operation

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5 Author(s)
Reigosa, D.D. ; Dept. of Electr., Comput., & Syst. Eng., Univ. of Oviedo, Gijon, Spain ; Briz, F. ; Degner, M.W. ; Garcia, P.
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This paper presents a method for estimating the magnet temperature in surface permanent-magnet (PM) synchronous machines during six-step operation. Six-step operation allows the maximum available dc-bus voltage to be applied to a machine, which maximizes its torque and speed range. This can be of importance in electric traction applications, including railway as well as electric and hybrid electric vehicles. However, six-step operation produces current harmonics that induce additional losses in the PMs and can therefore increase their temperature. An increase of magnet temperature can result in a reduced torque capability and eventually in a risk of demagnetization if excessive values are reached, with real-time rotor magnet temperature monitoring being therefore advisable. Six-step operation provides opportunities for rotor temperature monitoring from the electrical terminal variables (voltages and currents) of the motor. To achieve this goal, the rotor high-frequency resistance is measured using the harmonic voltages and currents due to six-step operation, from which the magnet temperature can be estimated.

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Industry Applications, IEEE Transactions on  (Volume:48 ,  Issue: 6 )