Field weakening strategy in a wide speed range of induction motors for electric vehicles based on maximum torque control

2014 ◽  
Author(s):  
Yifei Xu ◽  
Chuanwen Shen ◽  
Haohao Hui ◽  
Zhe Huang
Keyword(s):  
Electric Vehicles ◽  
Induction Motors ◽  
Torque Control ◽  
Maximum Torque ◽  
Field Weakening ◽  
Speed Range ◽  
Wide Speed Range

Research on Control Strategy for Traction Motor in Electric Drive

2012 ◽  
Vol 209-211 ◽  
pp. 2108-2112
Author(s):  
Nan Ming Yan ◽  
Nian Yu Li ◽  
Yu Nan Zhang
Keyword(s):  
Control System ◽  
Control Algorithm ◽  
System Modeling ◽  
Permanent Magnet Synchronous Motor ◽  
Drive System ◽  
Matlab Simulation ◽  
Maximum Torque ◽  
Field Weakening ◽  
Speed Range ◽  
Wide Speed Range

Abstract. Besides different field-weakening control algorithm during accelerating and decelerating process of permanent magnet synchronous motor, the control system proposed in this paper also combined Maximum torque/ampere control with field-weakening control methods. It not only satisfied the large torque and wide speed range requirement which was put on drive system by vehicle, but also improved the reliability of drive system. Modeling and simulation work of the drive system are also done with MATLAB, simulation results proved that the control system proposed in this paper is effective.

scholarly journals Generic loss minimization for nonlinear synchronous machines by analytical computation of optimal reference currents considering copper and iron losses

2020 ◽  
Author(s):  
Christoph Hackl ◽  
Julian Kullick ◽  
Niklas Monzen
Keyword(s):  
Optimal Operation ◽  
Torque Control ◽  
Synchronous Machines ◽  
Unified Theory ◽  
Loss Minimization ◽  
Maximum Torque ◽  
Field Weakening ◽  
Iron Losses ◽  
Highly Nonlinear ◽  
Smooth Transitions

The unified theory (introduced in [1]), which allows<br>to analytically solve the optimal feedforward torque control<br>(OFTC) problem of anisotropic synchronous machines (SM),<br>is extended by considering all relevant machine nonlinearities<br>and copper and iron losses and, thus, minimizing the overall<br>(steady-state) losses in the machine. Instead of the well known maximum torque per current (MTPC) operation strategy, maximum torque per losses (MTPL) is realized. The unified theory for the derivation of the analytical solution is briefly recapitulated. Moreover, current and speed dependent iron losses, as well as, magnetic saturation and cross-coupling effects are considered. The resulting nonlinear optimization problem is solved via online linearization of the relevant expressions. The linearization is exemplified for flux linkages and machine torque. The presented decision tree guarantees an optimal operation management and smooth transitions between all operation strategies such as MTPL, field weakening (FW), maximum current (MC) and maximum torque per voltage (MTPV). Finally, the extended unified theory is validated for a real, highly nonlinear SM.

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