Adaptive Flux-Weakening Controller for Interior Permanent Magnet Synchronous Motor Drives

Abstract

Voltage feedback flux-weakening control scheme for vector-controlled interior permanent magnet synchronous motor drive systems is considered in this paper. The voltage controller is based on the difference between the amplitude of the reference voltage space vector and a proper limit value, related to the feeding inverter limitations, and adopts the phase angle of reference current space vector as the control variable. A novel theoretical analysis of the dynamics of the voltage control loop is carried out by considering nonlinear effects and discrete-time implementation issues as well. The design of the controller can therefore be optimized for each operating condition by an adaptive approach, allowing to define stability properties and to maximize bandwidth of the voltage control loop. Maximization of the dynamical performances provides the main advantage of the proposal, that is, allows a lower voltage (control) margin to be considered with respect to standard approaches, leading to a higher torque and system efficiency and/or a reduced value of the dc bus capacitance. A motor drive system for home appliances is considered as a test bench to prove the effectiveness and importance of the proposal. © 2014 IEEE

PM-Assisted Synchronous Reluctance Machine Flux Weakening Control for EV and HEV Applications

“…The d-and q-axis currents are coupled in the MTPV region, being the trajectory calculation a complex task. In [40], an optimized field weakening strategy is proposed, where either i * d or the phase angle of the reference current Γ * are the voltage loop control actions. The corresponding transfer function is defined, allowing the precise design and adjustment of the voltage control loop.…”

Fuzzy Maximum Torque per Ampere and Maximum Torque per Voltage Control of Interior Permanent Magnet Synchronous Motor Drive

“…(1) It has been widely applied in servo control systems. In addition, applications requiring a wide constant power speed range such as automotive traction, spindle drives, and certain home appliances (2)(3)(4)(5) favor an interior permanent magnet synchronous motor (IPMSM) as the machine of choice.…”

“…(6) The optimized control of the maximum torque per ampere (MTPA) of IPM motors can be achieved by the proper selection of the current space vector as a function of torque operating condition, often aiming at the maximization of the ratio between the produced torque and the current amplitude. Maximum efficiency control can, in fact, be one of the most attractive criteria, particularly in those applications where machine efficiency is crucial owing to a limited power source (e.g., the battery in automotive applications (5) ). Mathematical and graphical analyses of the constant-torque and constant-current loci provide a means of selecting the optimum current space vector, requiring exact knowledge of motor parameters, particularly direct and quadrature flux characteristics.…”

Flux weakening control of permanent magnet machine based aircraft electric starter-generator

“…Among them is the voltage magnitude control strategy [6], [8]-[ [9]], where the reference flux current is directly controlled by the voltage controller while the torque current reference dynamically limited in order to satisfy the current limit Imax. The voltage controller is applied to provide the phase angle of the PMM reference current vector [11], however it is designed for motoring mode only. Another FW voltage control approach is presented in [7], [12]: here the voltage angle is determined by a single current controller, while the voltage magnitude is set to the maximum output value from the converter.…”

“…In [12], modifications to this control are proposed to achieve smooth transition. However, the focus of [7][8][9][10][11][12] was on motoring mode. This paper reports a detailed analysis and control design of FW control for PMM-based starter-generator addressing both generating and motoring modes.…”