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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...
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...
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,...
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...
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...
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...
Vacuum cleaner motors need to be capable of providing high power and high efficiency during high-speed (e.g. 50,000 r/min) operations. Because of this, interior permanent magnet synchronous motors (IPMSM), while highly efficient under general operating conditions, are not normally considered suitable for use in vacuum cleaners because of their tendency to suffer from severe iron loss during high speed...
The linear motor is a direct-drive structure, which means that no mechanism for thrust expansion, such as a gear mechanism, can be applied. In a linear electromagnetic actuator, the thrust follows the iBl rule, and so the magnetic flux density of the winding space or the magneto-motive force (mmf) of the armature winding must be large to obtain the large thrust. If the mmf is designed to be large,...
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