Improved Torque Ripple Minimization Technique With Enhanced Efficiency for Surface- Mounted PMSM Drives

Abstract

This paper proposes an improved torque ripple minimization (TRM) method using modelbased loss minimization (LM) control to reduce the torque ripples and enhance the efficiency for surfacemounted permanent magnet synchronous motor (SPMSM) drives. The conventional SPMSM drives usually achieve the maximum torque per ampere (MTPA) control by applying the zero d-axis current (ZDC) and ignore an actual core loss resistance in the controller design. Unlike the conventional MTPA method, the proposed TRM selects the appropriate d-axis current value by making the derivative of the electromagnetic torque equal to zero in the SPMSM drives. Consequently, the proposed method can improve the torque ripples and efficiency compared to the conventional MTPA. Using the proportional-integral (PI) controllers, comparative experimental verifications between the proposed model-based TRM, the conventional modelbased MTPA, and the conventional model-based LM are performed through a prototype SPMSM drive with a TI TMS320F28335 digital signal processor (DSP). INDEX TERMS Core loss resistance, maximum torque per ampere (MTPA), model-based loss minimization (LM) control, surface-mounted permanent magnet synchronous motor (SPMSM), torque ripple minimization (TRM).

In-wheel, outer rotor, permanent magnet synchronous motor design with improved torque density for electric vehicle applications

“…In high performance applications as in the case of EVs, the generated torque of PMSM should be with minimum torque ripple [31]. Torque ripple causes undesirable acoustic noises, mechanical vibrations, and shaft failure [2]. Cogging torque and the total harmonic distortion (THD) of the induced EMF are the main reasons of torque ripple [32].…”

A Practical Disturbance Rejection Control Scheme for Permanent Magnet Synchronous Motors

“…In numerous publications, such as [14,15,20,22,25,31,32], the total disturbance z in (3) only has two terms: T vs and T l , where T vs is given as a linear functions of rotor speed with a known negative coefficient. Such modeling has two main problems: (1) It is impractical to model the T vs and determine its coefficient(s); and (2) Other disturbances such as T f r and T f lux are omitted, which is not reflected the real practice.…”

“…Thanks to its advantages including its high efficiency, compact size, high torqueto-current ratio, high reliability, and recent advancements in permanent magnet (PM) materials, permanent magnet synchronous motors (PMSMs) have become increasingly popular among other types of AC drives [1][2][3][4][5]. Three classes of PMs such as alnico (alloy of aluminum, nickel, cobalt, iron, and other elements), ferrites, and rare-earth elements (neodymium-iron-boron (NedFeB), samarium-cobalt (SmCo)) are utilized in electrical drives [6,7].…”

Operation Efficiency Optimization for Permanent Magnet Synchronous Motor Based on Improved Particle Swarm Optimization

“…The motor as the main power output sources of EVs is the link between the energy storage system [3][4][5] and the wheels, can effectively increase the endurance mileage of EVs in a single charge as choosing the appropriate motor and improving the operating efficiency of the motor [6]. The permanent magnet synchronous motor (PMSM) due to its high efficiency, simple structure, reliable operation, and small size [7] is always selected as the power output machine for EVs [8]. Generally, there are two methods to improve the operating efficiency of PMSM.…”