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A NOVEL APPROACH FOR FLUX WEAKENING SPEED CONTROL OF IPMSM DRIVES
Abstract
This paper presents a simplified algorithm for the speed control of an interior permanent magnet synchronous motor (IPMSM) above the base speed using flux-weakening method. Non-linear expressions of d-axis and q-axis currents have been derived and subsequently incorporated in the control algorithm in a practical form for the flux weakening strategy to operate the IPMSM above the base speed. In real-time implementation, derived non- linear expressions of d-axis and q-axis current can not be incorporated because of the calculation burden of the digital signal processor (DSP). In order to overcome this problem, simplified expressions of d-axis and q-axis currents have been derived using curve fitting method and used in the laboratory implementation. The efficacy of the proposed system is confirmed by simulation and successful implementation in the laboratory using DSP board DS1102 for a 1 hp IPMSM.
... A PI-based controller has been used [12]. Hossain et al. (2004) have reported simplified algorithm for flux-weakening speed control of IPMSM drives above the base speed. They presented the new approach for operating the IPMSM above the base speed. ...
... They simplified expressions of í µí±-axis and í µí±-axis currents by using curve fitting method. The control algorithm for IPMSM drive system is efficient enough to operate in unload and full loading conditions [13]. Uddin and Abera (2009) have developed a model based efficiency optimization control algorithm for vector-controlled IPMSM variable speed drive. ...
... drive has not been tested for variable speed operations [11]. Hoque et al. (2002) have proposed a vector control strategy based on maximum torque per ampere (MTPA) scheme for the IPMSM drive. They obtained the í µí±-axis command current from í µí±-axis command current by use of a Taylor series expansion. A PI-based controller has been used [12]. Hossain et al. (2004) have reported simplified algorithm for flux-weakening speed control of IPMSM drives above the base speed. They presented the new approach for operating the IPMSM above the base speed. They have been derived and incorporated nonlinear expressions of í µí±-axis and í µí±-axis currents in a practical form for the flux-weakening strategy ...
Interior permanent magnet motor (IPMSM) was used as air conditioner compressor to reduce the power consumption and improve the performance of the system. Two control methods including maximum torque per ampere (MTPA) and flux-weakening methods were employed to increase the speed range of the air conditioner compressor. The present study adapted the flux weakening algorithm technique which can be used for constant torque and constant power regions. Results indicated that the operation speed range of the IPMSM may increase significantly by using the proposed flux weakening algorithm.
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