Gu-Bae Kang

Development of eco-friendly vehicles have risen in importance due to fossil fuel depletion and the strengthened globalized emission control regulatory requirements. A lot of automotive companies have already developed and launched various types of eco-friendly vehicles which include hybrid vehicles (HEVs) or electric vehicles (EVs) to reduce fuel c...

Most eco-friendly cars can adopt the concept of an integrated battery charger (IBC), which uses currently available motor drive systems. The IBC has a lot of strong points such as low cost and minimum space for the high voltage battery charger. On the other hand, it also has some defects caused by its structure. In this paper, the shortcomings of t...

An inverter control apparatus is provided that offers a ‘soft turn off’ to a gate operation of the inverter so as to securely protect the IGBT. In particular, an inverter control system according to the present invention may include a gate operating portion that controls turn on/off of an IGBT and forcibly turns off the IGBT if a short circuit or a...

Integrated battery charger (IBC), which uses the already available propulsion system, has a lot of advantages such as low cost and minimum space for the high voltage battery charger. However, it needs to compensate some defects caused by it's structure. In this paper, shortcomings of the conventional IBC for PHEVs with interior permanent magnet mot...

This paper studies battery charging methods using existing motor inductance and 3-phase inverters without an additional charger to charge the battery of Plug-in Hybrid Electric Vehicles (PHEVs). As inverter switch control and motor coil used as the energy storage device for boosting make the system the boost converter, the additional charger is eli...

This paper studies battery charging methods utilizing the already available power electronics systems in plug-in hybrid electric vehicles (PHEVs) without an additional charger for charging the battery of PHEVs. Because inverter switch control and motor coils, which are used as the energy storage device for boosting, make the system the boost conver...

Due to aging of a battery over life-time, the rated power and nominal energy capacity will be reduced compared with the initial rated power and capacity. These result in influences on the vehicle driving performance and fuel economy. To monitor and diagnose the aging of the battery, in this paper, the method of predicting the available rated power...

Automotive inverters may require current sensors for motor torque control, especially, in applications of hybrid electric vehicles or fuel cell vehicles. In this paper, to achieve a compact, integrated and low cost current sensor, a hall current sensor without magnetic core is introduced for integrating an automotive inverter. The compactness of th...

A lumped parameter model of Li-ion battery in hybrid electric vehicle(HEV) is constructed and system parameters are identified by using recursive least square estimation for different C-rates, SOCs and temperatures. The system characteristics of pole and zero in the frequency domain are analyzed with the parameters obtained from different condition...

In this paper, an estimation method of initial angle as well as motor parameters of an interior permanent magnet (IPM) synchronous motor is proposed at standstill without any extra hardware. By using low-pass filtering of the absolute values of the alternating currents and voltages, an initial rotor angle is detected based on voltages and currents...

In a hybrid electric vehicle (HEV), an interior permanent magnet (Nd-Fe-B) synchronous motor is widely used. However, the flux density of the Nd-Fe-B magnet is sensitive to the temperature variation. Particularly, in a HEV, the heat coming from internal combustion engine causes high temperature rise of the motor. It degrades the flux density and ou...

Linear induction motors (LIMs) are characterized by a large air gap and, as a result, large leakage inductances. Moreover, due to its unslotted structure and the absence of end rings in the secondary part, the primary leakage inductance is much larger than the secondary leakage inductance. Such differences prevent us from using parameter estimation...

An attractive force reducing strategy of LIM is proposed. The attractive force creates undesired power low, bending of the guide way, and severe tire wear. To reduce these defects, the motor flux must be reduced. In this paper, firstly, we simplify the attractive force relation with the application of a secondary flux reference control scheme. Then...

To increase fault tolerance, a double winding linear induction motor (LIM) is proposed for personal rapid transit (PRT) system. In the double winding LIM, two sets of windings are wound in a single yoke, and each of them are controlled by separate inverters. Therefore, the flux continuity must be provided in the region where the two windings are ov...

In the personal rapid transit (PRT) system, a double winding linear induction motor (LIM) is used for the purpose of redundancy. In a double winding LIM, two sets of windings are wound in a single yoke, and each of them are controlled by separate inverters. If the flux reference frames that reside in the two inverters are not identical, then abrupt...

Linear induction motors (LIM) are characterized by a large air gap and, as a result, large leakage inductances. Especially, the primary leakage inductance is higher than the secondary leakage inductance. Such a difference prevents the use of a conventional parameter estimation method developed for rotary motors. A parameter estimation scheme for a...