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In automotive applications, motors are required to have high power, high efficiency, and small size. Therefore, in hybrid electric vehicle (HEV) and electric vehicle (EV) applications, interior permanent-magnet synchronous motors (IPMSMs) have been frequency used. Electrical steel sheets, which can be designed with various properties, are often used for iron core. The operating characteristics of...
Permanent magnet synchronous motors (PMSMs) possess many good characteristics, such as high efficiency and high torque density. In this study, a design assist system of PMSMs is proposed. This system uses motor parameters and a magnetic equivalent circuit to design a PMSM that satisfies the demanded output characteristics. This paper describes the outline of the design assist system. The system is...
High power density and high efficiency are prime requirements of motors intended for automotive applications. Therefore, interior permanent magnet synchronous motors (IPMSMs) are commonly used in hybrid electric vehicles and electric vehicles. It is known that the arrangement of magnets is a significant factor with respect to the performance of an IPMSM. In this paper, three motors with different...
Interior permanent magnet synchronous motors (IPMSMs) that employ rare-earth magnets are high-performance motors and are used in many applications. However, it is desirable to reduce the number of rare-earth magnets used in IPMSMs because of the high cost. If a non-rare earth magnet is used in IPMSMs with concentrated windings, the motor generates reluctance torque principally; however, this reluctance...
This paper proposes a novel control method for an interior permanent magnet synchronous motor in the flux-weakening region. The proposed method consists of a maximum torque per flux (MTPF) control, and an efficient flux-weakening control under a light load. In order to simplify the MTPF control, a method for approximating the MTPF curve is proposed. In the flux-weakening control, more efficient control...
High power density is required for motors intended for automotive applications. Therefore, interior permanent magnet synchronous motors (IPMSMs) are commonly used in hybrid electric vehicles and electric vehicles. It is known that the characteristics of the magnetic materials are a significant factor with respect to the performance of the IPMSM, and the magnet is particularly important. In addition,...
In motor drive systems, the most suitable gains change according to the operating state. As such, in order to achieve a high-performance control, the gains of the current and speed controller must be tuned according to the operating state. In this study, we propose an auto-tuning method for a current and speed controller based on the parameter identification. First, the resistance, including the on-resistance...
This paper proposes an interior permanent magnet synchronous motor drive system based on direct torque control of the overmodulation region of an inverter. It is important to operate in the overmodulation region to maximize the motor output power. An overmodulation pulse width modulation (PWM) drive and a square-wave drive are used for high-power operation because of the high voltage utilization of...
Wave energy is a clean and renewable energy resource, and various wave power generation systems are being studied. A direct-link wave power generation system has high power. However, its output fluctuates because the rotational speed of the generator depends on the wave motion. In this paper, a flywheel energy storage system is used to level the power fluctuations. Specifically, the design of the...
This study evaluates the power characteristics of a novel permanent magnet flux switching generator (PMFSG) for a low-speed wind turbine. The PMFSG is an outer-rotor type generator. An induced voltage is generated by the change in the magnetic flux flow when the relative position of the teeth changes. The 2-D finite element method (2D-FEM) is used to analyze the PMFSG. The results reveal that the...
A reduction in the use of rare-earth elements in permanent magnets (PMs) is desirable though motors using such rare earth PMs deliver high performance. In order to obtain high torque and high power without rare-earth PMs, a permanent magnet assisted synchronous reluctance motor (PMASynRM) with a ferrite magnet and a three-dimensional (3-D) air-gap structure has been developed. In this paper, the 3-D...
The present paper introduces new current profiles for torque ripple reduction of the SRM. A reduction method using the ideal current profile for instantaneous flat torque has been proposed. The problem with this method is that, as the rotation speed increases, the real current cannot keep up with the reference for the requirement of a high di/dt. This results in increasing torque ripple in the high-speed...
This paper proposes a control method suitable for limited armature voltage and current in a permanent-magnet synchronous motor drive system based on direct torque control. First, this paper proposes torque-limiting and flux-weakening control that is suitable for a direct torque control based motor drive system. The proposed method utilizes a mathematical model in a rotating reference frame synchronized...
This paper proposes a method for improving the performance of a position sensorless control system for an interior permanent magnet synchronous motor in the low-speed region. Accurate values of motor parameters are required for the model-based position sensorless control. In the case of extreme temperature variation and low-speed operation in particular, motor parameter error affects the accuracy...
High efficiency motors driven at high speed are required in various applications. However, these motors suffer from excessive iron loss in the high-speed region. A number of structures have already been suggested for high speed drive. In this research, the motor with the concentrated winding stator and the motor with the slot-less stator are compared with respect to high speed drive characteristics...
The importance of reducing the amount of rare earth materials, used in high-performance permanent magnets (PMs) has been established. However, the performance of such motors will not be easy to match without the use of rare earth materials. Although the torque characteristic of the motor can be improved by shortening the air gap length of the motor, there is a mechanical limitation on the gap length...
The objective of this paper is to determine a suitable rotor structure with high-power performance for a small-scale wind power permanent magnet synchronous generator (PMSG). Five types of rotor structures are considered: a surface-mounted permanent magnet (SPM), an inset PM, a tangentially-magnetized interior permanent magnet (IPM), a radially-magnetized IPM, and a V-shaped IPM. All have magnets...
This paper describes a position sensorless drive system for the PMSM. The inverter is controlled using the over-modulation range at high speed in order to increase the torque and output power at high speed and to expand the operating range. The position and speed are estimated based on the estimation of an extended electromotive force in the rotating frame. In this paper, a sensorless control method...
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