Online optimized stator flux reference approximation for maximum torque per ampere operation of interior permanent magnet machine drive under direct torque control
Online optimized stator flux reference approximation for maximum torque per ampere operation of interior permanent magnet machine drive under direct torque control
- Author(s): K.D. Hoang ; Z.Q. Zhu ; M. Foster
- DOI: 10.1049/cp.2012.0266
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- Author(s): K.D. Hoang ; Z.Q. Zhu ; M. Foster Source: 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012), 2012 page ()
- Conference: 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)
- DOI: 10.1049/cp.2012.0266
- ISBN: 978-1-84919-616-1
- Location: Bristol, UK
- Conference date: 27-29 March 2012
- Format: PDF
This paper presents an online optimized stator flux reference approximation scheme for application of direct torque control (DTC) technique to interior permanent magnet (IPM) brushless AC (BLAC) drives with maximum torque per ampere (MTPA) operation. It is found that by considering dq-axis stator flux components instead of stator flux magnitude, straightforward mathematical functions for computing stator flux reference from the relevant torque reference to achieve MTPA operation can be derived. It is also demonstrated that by properly selecting initial value for approximating the proposed stator flux equation utilizing the Newton-Raphson method, a high degree of accuracy can be obtained utilizing only one computing step. It is shown that MTPA operation can be achieved for a DTC-based IPM BLAC drive using the proposed stator flux reference approximation scheme. Simulation results confirm validity of the proposed method. (6 pages)
Inspec keywords: electric drives; torque control; AC machines; Newton-Raphson method; machine control; permanent magnet machines; brushless machines
Subjects: Control of electric power systems; Mechanical variables control; Linear machines; Interpolation and function approximation (numerical analysis); Interpolation and function approximation (numerical analysis); a.c. machines; Drives
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