Motor technology improves direction
After studying the technological evolution trend of the motor in the past 20 years, we found that the motor technology still has a large room for further improvement. First look at the thickness of the steel for the movement. Regarding the stator and the rotor, the first is composed of a thin layer of electromagnetic steel. In 1997, the first generation of the Toyota Prius used a 0.35mm steel layer, which was subsequently reduced to 0.3mm, and recently dropped to 0.25mm in 2016. In general, the increase in the number of layers of thin steel can add motor power and also help to control the temperature of the motor.
Now, making thin steel is a major technical problem in the industry. The first difficulty is to control the rebound in the die casting and the consistency of the steel sheet material. From the current situation, the rotary forging technology will become more and more the mainstream production method in the industry because of its advantages in cost and production power.
Secondly, in terms of winding density, the amount of winding in the stator as a whole is an important factor in determining the power of the motor. The resolution of the amount of winding is mainly the number of turns of the copper wire around the movement in a limited space. In terms of technology, the use of inserters is now due to the suitability of high-power stators, and there is a tendency to become a standard in the industry.
In terms of coil type, there are two types of square and round. The mainstream manufacturers now use circular, but the square technology is gradually replacing the circle to become the general direction of the industry because of its high space utilization rate, while Toyota and Honda are now Square winding technology has been selected in batches. Other manufacturers here, Yaskawa Electric has begun to develop electronic winding technology, with the intention of improving control and power.
Finally, in terms of the cooling system, the split motor and the inverter are two parts: the motor, because the magnetic force of the permanent magnet motor is weakened as the temperature of the motor increases, so the power of the cooling system is crucial for the high-power operation of the motor.
From the trend of technological evolution, the mainstream cooling technology has now evolved from air-cooled and water-cooled to the current stage of oil cooling. The primary technical means is to immerse the motor in the oil cooling chamber to reach the purpose of cooling. Although some experts believe that the conflict with oil will reduce the power of the motor, but in all aspects of the situation, oil cooling is still the most effective form of cooling under current technical conditions.
In terms of inverters, the cooling system is also important for the performance of the inverter. Nissan recently announced that in the new 2017 model of the wind, relying on improving the inverter cooling system, the output power of the motor is increased from 80kw to 110kw, while the motor is other. Some are the same as the previous generation.
This shows the importance of the inverter cooling system. Although the use of silicon carbide will increase the heat resistance and pressure resistance of the motor, its high cost may be difficult to come in the short term.
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