A torque controller suitable for electric vehicles

Abstract

A torque controller suitable for electric vehicles is studied. The controller ensures an induction motor generates the motor torque efficiently, stably, and accurately. The torque control system feeds back an assumed motor torque calculated using the secondary magnetic flux and the torque current detected from current sensors of the primary currents. The motor torque is controlled by using the torque current reference determined from the generated secondary magnetic flux and the magnetizing current reference. The magnetizing current reference is determined on the basis of the torque current reference so that the motor torque generation efficiency always becomes the maximum. The magnetizing current regulator is operated according to the magnetizing current reference. This ensures the motor generates the motor torque stably even in transient states. Fundamental performance characteristics, such as response, accuracy, and efficiency of the motor torque are verified by simulation and experiments. The torque controller is judged suitable for the drive system of electric vehicles.

A control scheme with energy saving and dc-link disturbance rejection for electric vehicles

“…Equation (1) states that the rotor flux depends only on i sd , whereas (2) shows that the torque is proportional to the product of the rotor flux and the current i sq .…”

“…In literature it is possible to find papers focused on the specific problems of EVs or on the optimization of general-purpose control schemes but suitable also for EVs. In the first case, the contributions are mainly about energy-saving control strategy, that can give remarkable results provided that the motor parameters are known with sufficient accuracy [2]- [3]. In the second case, the control schemes are usually aimed to achieve the maximum torque capability of the machine over the whole flux weakening region [4]- [7].…”

Research on low-speed gearless permanent magnet synchronous motor for elevator drive

“…Then, electromagnetic power in phase A is e, (t)i, (t) = P,, + P2 cos (2colt) (3) +P4 cos(4w1t) + P6cos(6w1t) + By the same token, electromagnetic power of phase B and C is e_B (t) iB (t) = P,, + P2cos 2cot t-2 T) +P4 cos 4 olt --2 2 ) (4) +P6 cos (6 (colt --2 T ))+**-…”

“…Variable-poles two-speed AC motor, VVVF controlled DC motor and disc-type PMSM drive system has presented tradition-breaking improvement compare with hydraulic system [3], [4]. Nonetheless, in electric drive system, the perfect performance of lower-speed gearless PMSM is incomparable.…”

Induction Motor Speed Control with Fast Response using the Levenberg Marquardt method for Electric Cars

“…By using the advance technology of power electronics and electric control, the task for complicated control can be implemented. To do this job, the induction motor is made linear by operating the method of Field Oriented Control [2] [3].…”