Develop energy-saving and powerful DCT systems and drive motors utilizing DCT technology
The development trend of the automotive industry is to save energy or reduce environmental burden. In this trend, the electrification of automobiles is developing rapidly. At the same time as the electrification of power steering systems, oil pumps, and other components, new ways of power transmission have also been introduced for the core components of automobiles.
In the transmission system, the Dual Clutch Transmission (DCT) has attracted people's attention. DCT has odd/even segments, dual system clutches and gears, and interactively connects the dual systems. In order to perform upshifts and downshifts, the time required for transmission is extremely short, and like traditional AT (Automatic Transmission), there is no torque converter caused loss, which has the characteristic of significantly reducing fuel consumption. In the trend of increasing energy efficiency and reducing environmental load in user awareness and the automotive industry, not only cars, large buses, trucks, etc. have adopted DCT, but also two wheeled motor vehicles, enabling its rapid popularization.
DCT relies on a motor to drive the oil pump, which can be divided into an electric oil pressure type that uses an electromagnetic directional control valve to switch oil pressure and a pure electric method that directly uses a motor to drive the driving point. The former has cost advantages, while the latter has advantages in efficiency and responsiveness. However, in the pure electric mode, four motors are installed around the clutch gears to drive two clutches and two shifts. In a limited space like the engine compartment, miniaturization and high output of the motors are necessary conditions. In addition, when the clutch is closed, the motor always maintains current activity, causing the motor to generate heat. Additionally, the engine also conducts heat transfer, making it easy for the temperature to rise. Therefore, heat dissipation measures need to be taken.
To reduce motor heating, it is necessary to wrap the copper wire of the group as much as possible. Moreover, high output is related to the number of coil winding. Therefore, the DCT motor adopts a segmented iron core to maximize the utilization of space between the iron cores. In addition, on the basis of considering heat dissipation design, a compact electronic circuit installation method has been achieved as much as possible, and great efforts have been made in selecting grease, which can ensure smooth operation from low temperature to high temperature areas. Not only that, in addition to heat dissipation, it is also necessary to ensure the vibration resistance, waterproofing, rust prevention and other functions required in automotive applications. In the future, our company will analyze the developing demand for electrification in the automotive industry while developing products with stronger performance and cost advantages, and expand our business to include motors that support idle stop beyond DCT.