In addition to drive motors and battery systems, strong magnets are also widely used in various auxiliary systems of new energy vehicles, such as electric power steering (EPS) systems, regenerative braking systems, air conditioning compressors and sensors. These auxiliary systems are crucial to improving driving comfort, safety and energy efficiency. This section will elaborate on the application of strong magnets in these auxiliary systems, analyzing their technical roles, performance advantages and application effects, and revealing the important role of strong magnets in improving the overall performance of NEVs.

In electric power steering (EPS) systems, strong magnets are the core material of the steering assist motor, which directly determines the steering feel and response speed. The EPS system uses an electric motor to provide steering assistance, which has the advantages of energy saving, environmental protection and precise control compared with the traditional hydraulic power steering system. The key requirement for the EPS motor is to have high torque density and compact structure, because the installation space of the steering system is limited. Strong magnets, especially NdFeB magnets, have the characteristics of high magnetic strength and small volume, which can meet the requirements of EPS motors. The high magnetic energy product of NdFeB magnets enables the EPS motor to generate large assist torque in a small volume, improving the steering lightness and responsiveness . At the same time, the excellent dynamic performance of strong magnets ensures that the EPS system can quickly adjust the assist torque according to the vehicle's speed and steering angle, providing the driver with a smooth and natural steering feel. For example, the EPS system of a certain mainstream NEV model uses NdFeB magnets with a magnetic energy product of 50 MGOe. The steering assist motor has a volume of only 0.8 L, but the maximum assist torque reaches 15 N·m. The steering response time is less than 0.1 seconds, which significantly improves the driving safety and comfort.

In regenerative braking systems, strong magnets play an important role in improving energy recovery efficiency and braking performance. Regenerative braking is a key technology for NEVs to improve energy utilization efficiency. It converts the kinetic energy of the vehicle during braking into electrical energy and stores it in the battery, thereby extending the vehicle's续航 mileage . The core component of the regenerative braking system is the electric motor (which also serves as a generator during braking). Strong magnets in the motor ensure that the motor can quickly switch between driving and generating states, and efficiently convert kinetic energy into electrical energy. During braking, the magnetic field generated by the strong magnets interacts with the stator windings to generate a reverse torque, which realizes the braking effect while generating electricity. The high magnetic strength of strong magnets enables the motor to generate a large braking torque in a short time, ensuring the braking safety and stability of the vehicle . Test data shows that the regenerative braking system using NdFeB magnets can recover 30%-40% of the kinetic energy during braking, which can increase the vehicle's续航 mileage by 15%-20%. In addition, the use of strong magnets also makes the regenerative braking system have the advantages of low noise and long service life, reducing the maintenance cost of the system.

In air conditioning compressors and other auxiliary motors, strong magnets are used to improve energy efficiency and reduce noise. The air conditioning system is an important auxiliary system that affects the comfort of NEVs, but it also consumes a lot of battery energy. The air conditioning compressor motor using strong magnets has higher energy efficiency and smaller volume. The high magnetic energy product of NdFeB magnets enables the compressor motor to achieve higher power density, reducing energy consumption while ensuring cooling capacity. For example, the variable frequency air conditioning compressor using NdFeB magnets has an energy efficiency ratio (COP) of more than 4.0, which is 20% higher than that of traditional compressors. At the same time, the compact structure of the motor reduces the installation space and weight of the compressor, which is conducive to the lightweight of the vehicle. In addition, the smooth operation of the motor with strong magnets also reduces the noise of the air conditioning system, improving the driving comfort.

Strong magnets are also widely used in various sensors of NEVs, such as speed sensors, position sensors and pressure sensors. These sensors are distributed in various systems of the vehicle, providing accurate data support for vehicle control. For example, the speed sensor uses the magnetic field generated by strong magnets to detect the speed of the vehicle; the position sensor uses strong magnets to determine the position of the motor rotor, ensuring the accurate control of the motor. The high stability and reliability of strong magnets ensure that these sensors can work accurately in harsh environments such as high temperature, vibration and humidity. The use of high-precision sensors based on strong magnets improves the control accuracy and safety of the vehicle. For example, the rotor position sensor of the drive motor using NdFeB magnets has a position detection accuracy of 0.1°, which ensures the smooth operation of the motor and reduces energy loss.

In addition to the above systems, strong magnets are also used in the manufacturing process of NEV components to ensure product quality. For example, in the production of motor cores, silicon steel sheets will generate iron filings during the stamping and lamination process. If these iron filings are mixed into the core, it will increase the eddy current loss of the core, cause overheating and reduce motor efficiency . Strong magnetic rods made of NdFeB magnets are installed at the discharge port of the silicon steel sheet processing equipment. These magnetic rods have a magnetic field strength of more than 8000 Gauss, which can easily absorb micron-level iron filings . A well-known NEV motor manufacturer reduced the motor failure rate by 70% after using strong magnetic rods, significantly improving product stability and reducing after-sales maintenance costs . Similarly, in the production of enameled wires for motor windings, strong magnetic rods are used to remove iron impurities generated by mold wear, avoiding insulation layer damage caused by impurities and preventing winding short circuits .

In summary, strong magnets are widely used in various auxiliary systems of new energy vehicles, playing an important role in improving driving comfort, safety and energy efficiency. With the continuous improvement of NEV technology, the application of strong magnets in auxiliary systems will be more in-depth and extensive. The industry needs to further optimize the performance of strong magnets and reduce costs to better meet the development needs of the NEV industry.