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Film‐type shape‐configurable speakers with tunable sound directivity are in high demand for wearable electronics. Flexible, thin thermoacoustic (TA) loudspeakers—which are free from bulky vibrating diaphragms—show promise in this regard. However, configuring thin TA loudspeakers into arbitrary shapes is challenging because of their low sound pressure level (SPL) under mechanical deformations and low...
This paper proposes control method of Differential Discharge Handling (DDH) modules with state of charge(SOC) balancing between battery modules in Electric Vehicle (EV) system. The DDH modules are composed of battery modules and converter modules. To achieve high efficiency, the diode is replaced by MOSFET to use the synchronous boost converter. In order to reduce the ripple of input/output voltage...
In the EV system operating regenerative mode without bi-directional DC-DC converter, 3-phase PWM inverter should charge the battery. At this time, regenerative torque reference for braking has to output torque reference in order to charge the battery. This paper proposed the regenerative control method controlling the voltage and current of battery through the regenerative power control at regenerative...
FCEV (Fuel cell electric vehicle) is provided with energy for operating the motor from the fuel cell. But fuel cell is impossible to be charged at the regenerative mode and also, it has slow dynamic characteristics. So, additional battery is essential as an auxiliary power source in FCEV system. The output current of the VSI (Voltage Source Inverter) is distorted due to the dead-time and the delay...
This paper presents the control methods of torque when interior mounted permanent magnet synchronous motor (IPMSM) for electric vehicle is in regenerative mode. The current control of IPMSM is generally performed by the Lockup-table to output the most suitable current order which is to make the unit torque like maximum torque per ampere (MTPA). At the electric vehicle system, the regenerative control...
This paper presents a motion control method of 6WD/6WS (6-wheel-drive and 6-wheel-steering) vehicle using optimum tire force distribution method. When we make used of independent driving and steering system, the motion control performance of the 6WD/6WS vehicle can be improved. For example, vehicle's maneuverability is more improved at low speed and vehicle's stability is also improved at high speed...
Skid-steered vehicles are favored for military use in off-road operations because of their high maneuverability and mobility on extreme terrains and obstacles. There is a trend towards transforming steered tracked vehicles to skid-steered wheel vehicles for high speed at the expense of reduced mobility. Skid-steered vehicles turn by generating different longitudinal forces at the tires due to the...
This paper proposes a controller to compensate the DC-link voltage unbalance in the BLDC motor drive system based on the four-switch and half-bridge boost converter. In this paper, we can see that the proposed feedforward controller is useful for control of the neutral point voltage unbalance. The comparative experimental results show that the system became more robust by the feed-forward control...
The drum washing machine needs high torque than the other types of washing machine because of the large load torque variation. Therefore, in this paper, we applied a interior permanent magnet synchronous motor (IPMSM) to the drum washing machine system. However, IPMSM operate at lower output torque than the other permanent magnet synchronous motor (PMSM) when the motor control is performed by the...
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