The growth of mobility; electrical represented the opportunity for many companies to present new solutions and carry out new research projects. Hitachi , for example, through the joint venture Hitachi Astemo (Advanced Sustainable Technologies for Mobility), has developed a very compact electric motor which can & ograve; be integrated directly into a wheel. The theoretical advantages of this technology are different. For example, by removing the engine from the car platform, you are going to save space that can be used. be used to install a larger capacity battery.
However, this solution has always had the disadvantage of being heavy. A problem since the engine is placed directly inside the wheels. The solution developed by Hitachi Astemo tries to solve this problem. The engine & egrave; still under development and therefore not many details have been communicated. However, the solution implemented by the company provides for a system that combines motor, inverter and brake .
In this way & egrave; it was possible to integrate everything easily inside the wheel. According to the company, yes & egrave; obtained a power/weight ratio of 2.5 kW/kg. It is worth noting that the prototype wheel is; 19-inch. The engine, on the other hand, delivers 60 kW of power with 960 Nm of torque. You can use 2 or 4 of these units & agrave; on vehicles. In this way & egrave; It is also possible to have four-wheel drive, as well as more performance; high.
The absence of the transmission components, according to the company, allows to reduce energy losses by 30% , to the benefit of autonomy. The manufacturer then explains that to improve the performance of the motor and to keep the overall size, the magnets have been positioned in what is; called a & quot; array Halbach & quot; which is explained like this:
an array in which the N pole orientation of each magnet is rotated 90 degrees to create a high density magnetic flux; on each of the magnetic poles of a motor.
A lot of attention & egrave; was also lent to cooling . For this & egrave; A solution has been devised that provides that the cooling oil circulates between the various parts, cooling the power semiconductors and then being sent to the motor to directly cool the coils. This particular powertrain is expected to be used on the range of mobility products in the future; electric by Hitachi Astemo.
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