How to choose between induction and synchronous motors

Audi has spent a lot of time building up its electric drive system, which we have introduced before. Today, we will continue to share Audi’s choice of motors.

● The system output of the Q6 e-tron is 285 kW (combined power consumption kWh/100 km: 19.4-17.0 (WLTP))

● The SQ6 e-tron has a system output of up to 380 kW (combined kWh/100 km power consumption: 18.4-17.5 (WLTP))

The front and rear are equipped with induction motors and permanent magnet synchronous motors, as well as an innovative kinetic energy recovery system. It should be noted that there are actually several different configurations included here.

01 Powertrain Configuration Combination

The Q6 e-tron series uses a combination of a front induction motor and a rear permanent magnet synchronous motor, providing the vehicle with strong power output and excellent cruising range.

The front induction motor is used as additional power and plays an important role in acceleration, multi-terrain mode and dynamic sports mode, while the rear permanent magnet synchronous motor drives the vehicle most of the time. The permanent magnet synchronous motor has constant output efficiency and higher energy utilization, while the induction motor has high peak torque and good sustainability.

On the PPE platform, this front and rear motor combination becomes more flexible. Different models of front induction motors and rear motors can provide different power and performance according to the vehicle model.

The maximum power of the PSM permanent magnet synchronous motor reaches 280kW, it is equipped with an 800V electronic control system and weighs only 118.5kg.

The advanced cooling and lubrication system achieves direct oil cooling of the stator and winding ends, high energy density direct oil cooling of the rotor midsection, requires almost no rare earths, and uses dry sump lubrication and an electric oil pump to achieve low friction and high efficiency.

By optimizing the cooling oil flow of the rear axle electric drive unit, the cruising range can be increased by 5 km. At the same time, wet or dry sump lubrication, acoustic design and measures (such as segmented rotor/skewed double-layer winding) are used to reduce the amplitude of spatial harmonics, as well as optimizing the gear teeth and bearing structure to make them insensitive to the production environment. The structural optimization of the sound transmission path is achieved through the casting of the motor bracket.

The ASM induction motor has a maximum power of 140kW, is also equipped with an 800V electronic control system, and weighs 87.5kg.

The motors have identical internal dimensions, allowing their internal components to be molded once and used in multiple configurations, speeding up production schedules and reducing costs.

02 Braking Energy Recovery System

In addition to optimizing the motor itself, Audi has also made major upgrades to the kinetic energy recovery system. The latest kinetic energy recovery system supports a maximum power output of 220kW and can recover kinetic energy on the front and rear axles separately. Under different working conditions, kinetic energy recovery will be adaptively distributed to maximize energy utilization and driving comfort.

For example, in daily highway driving, the permanent magnet synchronous motor on the rear axle is mainly responsible for kinetic energy recovery, and when more kinetic energy recovery is needed, the front and rear axles will adjust adaptively. This innovative front and rear axle distribution kinetic energy recovery system makes driving smoother and safer, and can better predict the sliding distance, reducing the possibility of motion sickness for passengers.

summary

In general, the latest technical specifications of the Audi Q6 e-tron series demonstrate the latest progress in electric vehicle technology. Through the induction motor and permanent magnet synchronous motor equipped at the front and rear, as well as the innovative kinetic energy recovery system, Audi provides users with a more efficient, environmentally friendly and comfortable driving experience.

Compared with the first generation, the new car's energy consumption is reduced by 30%, system performance is improved by 33%, and it also supports more software-defined car possibilities and reduces the weight of the vehicle. These innovative technologies not only improve the performance of the vehicle, but also bring users a more intelligent and convenient driving experience.