A METHOD OF ECONOMICAL CONTROL OF A SYNCHRONOUS MOTOR WITHOUT A ROTOR POSITION SENSOR

Ivan V. Viktorov, Vladimir M. Nikitin

DOI: 10.47026/1810-1909-2021-1-36-46

Key words

frequency converter, synchronous machine, load angle, vector diagram, motor power factor, electromagnetic torque, overload capability, dynamic stability.

Annotation

The article considers a method of economical speed control of synchronous motor with permanent magnet excitation using autonomous voltage inverter. The method provides stable (without tilting) rotation of the rotor without using the rotor position sensor signals. An algorithm, which realizes minimal losses in the machine and in the inverter, is proposed.

The assumption of insignificant influence of voltage drop in stator winding active resistance on processes in synchronous machine accepted in the analysis is confirmed by parameters of real motors from 7DVM series and results of the experiment. It is shown that the mode with cosφ = 1 differs little from the generally accepted mode with load angle θ = φ. The results of experimental verification of the method in electric drive with 7DVM250 motor of 150 kW power are presented, which showed high dynamic stability of the system in a wide range of speeds and loads and while maintaining the most economical energy exchange between the motor and inverter (that is with cosφ = 1).

References

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3. Viktorov I.V., Nikitin V.M. Sposob upravleniya sinkhronnym elektrodvigatelem [Method of control of a synchronous electric motor]. Patent RF, no. 2724603, 2020.
4. Mishchenko V.A., Mishchenko N.I., Mishchenko A.V. Sposob vektornogo upravleniya sin-khronnym dvigatelem s postoyannymi magnitami na rotore i elektroprivod dlya osushchestvleniya etogo sposoba [Vector control method of the synchronous motor with permanent magnets on the rotor and electric drive for the method implementation]. Patent RF, no. 2141719, 1998.
5. Khachaturov D.V. Sposob upravleniya sinkhronnym elektrodvigatelem na postoyannykh magnitakh [Method of control of synchronous motor on permanent magnets]. Patent RF, no. 2683586.

Information about the authors

Ivan V. Viktorov – 1^st Category Software Engineer, Department of Electric Drive and Converting Equipment, ChEAZ JSC, Russia, Cheboksary (cheaz@cheaz.ru).

Vladimir M. Nikitin – Candidate of Technical Sciences, Deputy Head of the Department of Electric Drive and Converting Equipment, ChEAZ JSC, Russia, Cheboksary (cheaz@cheaz.ru).

For citations

Viktorov I.V., Nikitin V.M. A METHOD OF ECONOMICAL CONTROL OF A SYNCHRONOUS MOTOR WITHOUT A ROTOR POSITION SENSOR. Vestnik Chuvashskogo universiteta, 2021, no. 1, pp. 36–46. DOI: 10.47026/1810-1909-2021-1-36-46 (in Russian).

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