Australia's Evans Electric has recently developed a direct-drive (without propeller shaft) electric vehicle. The car is modified with a Mitsubishi EVO four-door sedan with a maximum output of 800 hp/600 kW and a maximum output torque of 1250 Nm. According to Che Yunnet quoted on August 12, Evans Electric said: "At first glance, this kind of torque data is already very incredible. The auto industry's standard method for assessing torque is to quote torque data at the flywheel instead of Torque data on the tires, taking the performance of the Tesla Model S as an example, the torque of the drive motor is 600 Nm, and the single-speed reduction ratio is 9.73: 1. According to this ratio, the total torque of the tire is 5,828. Niu M (minus drive loss).Evans Electric's motor drives the tire directly, the motor rotates at the same speed as the tire, and instead of using a mechanical reduction gear, an 8-pole stator winding structure is chosen for the electric drive. Compared with mechanical transmissions, the structure of the direct drive is much simpler - the motor of the direct drive directly drives the tire. Take the Mitsubishi EVO3 electric vehicle as an example. Each 19-inch wheel has a built-in motor. Each wheel is directly driven by a built-in motor. The transmission has no gears and no transmission mechanism. According to the news report of Evans Electric, the electric direct drive has other advantages. The device improves the conversion efficiency of mechanical energy. Through the regenerative braking system, it can convert more mechanical energy into electrical energy. Mitsubishi EVO has the highest conversion efficiency. 85%. The Mitsubishi EVO can use an electromagnetic brake system that does not use friction to brake. It is worth noting that the efficiency of friction brakes is not high, because during the braking process, the kinetic energy of the car's progress is converted into useless heat and wasted: "Evans Electric's wheel hub motors allow non-contact electromagnetic brake systems to replace hydraulic friction brake systems. In fact, hydraulic friction brake systems have appeared to be a lot longer in today's electric/hybrid vehicles. With a built-in tire motor, the braking force of the car can give the car more than -1.0G acceleration!" Impressively, both the safety features of the drivetrain and the dynamics of the car can be customized and upgraded through software functions - these features include anti-lock braking, stability control, traction control, brake direction control, Active brake efficiency balance, vector torque, smart cruise control, emergency brake assist function and anti-collision function. When these technologies are combined with in-wheel motor technology, the performance of the vehicle's active yaw control function can be improved. Different from the currently used vehicle stability control system (this system is only activated in an emergency situation), the active yaw control function is always on standby, and it can actively adjust the car under-steering and over-steering during cornering to fine-tune Improve the speed and safety of car turning. Evans Electric said that after a long period of validation testing and research and development in power electronics technology, Evans Electric began discussions with the first suppliers about cooperation or empowering them to conduct commercial production. Preparations for the final runway test of the direct drive system are also being carried out in an orderly manner. The runway test will be conducted in Bathurst in October and Evans Electric’s direct drive system will perform 1,000 tests on the runway. It will appear on the market in 2014.
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