["Comparison" from the "three-in-one" driving assembly based on the motor to see the gap between domestic and foreign] With the continuous development of new energy automotive technology, component integration design has become an inevitable trend. Through integrated design, on the one hand, the assembly of the main engine plant can be simplified and the product qualification rate can be improved; on the other hand, the number of suppliers can be reduced on a large scale, and lightening and cost saving can also be achieved.
In terms of electric drive technology, there is currently a "2 in 1 (motor + reducer)" program, representing the model is the Chevrolet Bolt; "three in one (motor + reducer + motor controller)" program, representing the model is Tesla series.
There are also "all-in-one (including the motor + reducer, motor controller, charger, a branch converter, high voltage distribution box, part of the vehicle controller)" program, on behalf of the BMW i3 models.
On the whole, most companies can only implement the "two in one" electric drive assembly program, but industry experts predict that in the next few years, the three-in-one electric drive assembly program will become the mainstream. In the long run, motors, reducers, motor controllers, high-voltage distribution boxes, DC/DC, DC/AC, and chargers will all be integrated into one large powertrain.
According to the senior electric vehicle network, most domestic motors and electric control companies are currently undergoing a transition from a single product supplier to a powertrain provider of “motor + electronic control + reducer,†but most are still in the R&D and testing stages. . Among them, companies including Chang'an Automobile, Dayang Electric, and Jingjin Electric have developed a three-in-one electric drive assembly program, which is expected to be implemented in volume production in 2019 at the earliest.
Different from the simple "triple play" electric drive scheme of domestic companies, Bosch, BorgWarner, ZF and other international component giants will implement components such as motors, electronic controls, speed reducers and power electronics modules. Combining with traditional axles to form a highly integrated electric drive axle product, the entire electric drive assembly system has the advantages of lower cost, smaller size and higher efficiency.
It is understood that the traditional axle is a mechanical product, but due to the integration of the motor and the electronic control part, the difficulty factor of the electric drive axle has risen linearly, involving a wider technical range and higher technical requirements. At this stage, although most of the company's electric drive axle scheme has not yet been implemented on a large scale, the electric drive axle products represented by BorgWarner and GKN have been successfully applied.
Next, take a look at the "triple play" electric drive assembly scheme launched by domestic and foreign companies.
Domestic articles
â— Dongfeng Dana
At present, Dongfeng Dana introduces pure electric drive axles with "four-in-one" structure characteristics for 6-8 tons of pure electric city logistics trucks, 8 meters of pure electric city buses, and 7 meters of pure electric tourist buses.
It is understood that the electric drive axle integrates motors, gearboxes, transmission shafts, differentials, etc., with high transmission efficiency, small size and other characteristics. Among them, the maximum motor power is 150KW, the maximum torque is 635Nm, and the maximum speed is 8000rpm.
Product advantages: Compared to ordinary transmission systems, the electric drive axle greatly reduces the system space and facilitates the layout of vehicles. Among them, the newly-developed electric drive axle has an overall weight reduction of over 30KG, a 20% increase in cooling capacity, and the ability to extend cruising range.
Application: Dongfeng Dana's pure electric drive axle has been tested on Dongfeng Xiangyang Wagon, Dongfeng Commercial Vehicle and Dongfeng Special Steam.
â— BYD
BYD has designed the three-in-one electric drive assembly system by integrating the motor, reducer, and electric control. It has many advantages such as high degree of integration, low IGBT loss, high efficiency area, etc., meeting the requirements of A00, A0, A, and B levels. Such as the need for acceleration and climbing of cars.
It is reported that BYD has released the “e platform†covering three-in-one electric drive assemblies with high-speed integration of electric motors, electronic controls, and transmissions, as well as three-in-one high-voltage systems such as DC-DCs, chargers, and distribution boxes. Among them, BYD's three-in-one electric drive assembly system, the motor speed reached 14000rpm.
Product advantages: The total efficiency of the drive assembly is 88%, the maximum efficiency is 91.9%, the weight is reduced by 35%, the power density is increased by 40%, and the motor cost is reduced by 40%.
Application: It is understood that BYD EV360 is the first pure electric vehicle under BYD's “e platformâ€. This vehicle is a pure electric small SUV with peak motor power of 160 kW and peak torque of 310N·M.
â—Ocean Electric
Ocean Electric's three-in-one electric drive system adopts integrated design of motor, electric control (with DC-DC) and reducer, and has many advantages such as strong EMC capability and excellent NVH performance. The power range covers 75-120KW.
Foreign articles
Compared with domestic manufacturers, foreign manufacturers are more advanced in the integrated design of electric drive systems and have been applied in some models. Specifically, the electric drive assembly products introduced by foreign manufacturers have higher integration, smaller size, and higher efficiency.
â— Bosch eAxle electric drive axle
â— GKN (GKN) electric drive axle
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