What I have heard before is the concept of battery energy density. What does the power density of the motor mean? The ratio of the maximum power of the motor to the mass or volume of the motor. Under the same power condition, the higher the mass power density, the lighter the motor will be, which is beneficial to the weight reduction of the whole vehicle. The increase of volume power density is beneficial to the spatial layout of vehicles, which can provide more seating space for vehicles, or more motors can be arranged to achieve the ultimate performance. Of course, smaller and stronger motors have more room for imagination, such as robot driving, flying cars, hub motors and so on.
At present, the mass power density of mainstream motors in the industry is about 6kW/kg. Before quark electric drive, the peak of motor power density belongs to Lucid on the other side of the ocean. The 499kW motor only weighs 74kg, and the power density reaches 7kW/kg. I was surprised when I saw Lucid's compact motor.
But compared with the quark electric drive released this time, the technology has risen to a higher level. When the peak power reaches 260kW, the single motor weight of the quark electric drive product released this time is only 2 1.5kg, and the mass specific energy density reaches an astonishing 1.2 kW/kg. No wonder the official chip 28nm process suddenly jumped to the 3nm era to make an analogy.
Although there is no ink propaganda, the volume power density of quark motor is also excellent. Thanks to its patented X-PIN flexible flat cable stator technology and carbon fiber high-speed rotor technology, the electric drive power has increased by more than 30% when the volume is reduced by 25%. The product mentioned at the press conference has a stator winding diameter of 180mm and a length of 109mm, and its volume is only 2.55L If calculated according to this volume, its volume power density exceeds 100kW/L, which is twice the target value of 50kW/L mentioned by DOE in the technical index plan of electric control of new energy automobile motors in 2025.
Of course, the stator winding of the motor is composed of shell, water channel, bearing and so on. Which will be bigger, the actual volume power density will definitely be smaller, but it is enough surprise.
Quark motor not only makes the motor smaller and lighter, but also greatly improves its efficiency. The peak efficiency is 98.5%, and the working condition efficiency (high probability CLTC working condition) is 97.5%. The realization of high energy efficiency benefits from the development of new stator core material and its batch preparation technology-"nanocrystalline-amorphous" alloy.
The molten metal is cooled at the rate of 654.38 00000 ℃/s, which destroys the crystal structure inside the metal. After heat treatment, "nanocrystalline-amorphous" is formed, which has the microscopic characteristics of disordered arrangement of atoms, no grains and no grain boundaries. The iron loss of this material is lower than that of silicon steel sheet used for ordinary iron core, because the iron loss caused by magnetic field alternation, that is, the loss caused by magnetic field alternation, is reduced by 50%.
It should be noted that quark electric drive is not the name of a certain motor, but a new generation of high-performance integrated electric drive technology group of Egyptian security, which can be understood as a platform. The motor power of the platform covers 70-320kW. In addition to the "nanocrystalline-amorphous" iron core mentioned above, X-PIN flat wire winding and carbon fiber high-speed rotor technology bring higher slot fullness and higher rotating speed (gossip shows that it is 2 1000rpm).
Another killer of motor efficiency, copper loss, energy loss caused by current heating in wires, Ian also brought a solution: efficient silicon carbide controller. Its full-power working voltage reaches 900V, and the efficiency is as high as 99.8% only as a controller. Aian is also deeply involved in the construction of SiC industrial chain and develops its own packaging design. Breakthroughs have been made in four directions: chip layout, current sharing consistency, reducing chip switching delay and design of laminated power supply circuit. At the same time, combined with the innovation of all-silver precision low-temperature sintering process, the circuit inductance of SiC module is reduced by more than 50%, the thermal resistance is reduced by about 25%, the chip current capacity is increased by more than 10%, and the power cycle life is increased by about 100%.
Aian Hyper GT will be the first product of quark electric drive, and Hyper SSR will be equipped with three quark electric drives, thus entering the club of 1 s, with an acceleration of 100 kilometers 1.9 seconds.
The author of this article is Route 64, a kicker.
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