TOP1 LIN Stepper Motor Driver Solution
The stepper motor drive system consists of a stepper motor and a stepper motor driver. The performance of the stepper motor drive system depends not only on the performance of the stepper motor itself, but also on the advantages and disadvantages of the stepper motor driver. At the same time, the research on stepper motor driver and the research of stepper motor are almost synchronous, so stepper motor driver has an important position in the automotive power system.
The main function of the stepper motor driver subdivision is to improve the accuracy of the stepper motor. There are some drivers in China that use “smoothing†to replace subdivisions, some of which are also called subdivisions, but this is not a true subdivision and is essentially different.
1. "Smoothing" does not precisely control the phase current of the motor, but only slows the rate of change of the current, so "smoothing" does not produce microsteps, and subdivided microsteps can be used for precise positioning.
2. When the phase current of the motor is smoothed, it will cause the motor torque to drop, and the subdivision control will not cause the motor torque to drop. On the contrary, the torque will increase.
Key advantages of drive segmentation
The low frequency oscillation of the motor is completely eliminated. Low-frequency oscillation is an inherent characteristic of stepper motors (especially reactive motors), and subdivision is the only way to eliminate it. If the stepper motor sometimes works in the resonance zone (such as arcing), the subdivision drive is the only one. s Choice. The output torque of the motor is increased. Especially for a three-phase reactive motor, the torque is increased by about 30-40% compared to when it is not subdivided. Improve the resolution of the motor. Since the step angle is reduced and the uniformity of the step is improved, it is self-evident that "increasing the resolution of the motor".
LIN Stepper Motor Driver Solutions
The higher the subdivision of the stepper motor driver, the higher the accuracy of the stepper motor?
This is a wrong concept. For example, the stepping motor driver can be divided into 60,000 pulses and one revolution, and the stepping motor can not distinguish this precision. When the driver is set to 60,000 pulses/rev, the stepper motor driver accepts several pulses. Stepper motor takes one step, which does not improve the accuracy of the stepper motor.
The subdivision technology of the stepping motor is essentially an electronic damping technology. Its main purpose is to reduce or eliminate the low frequency vibration of the stepping motor. Improving the running accuracy of the motor is only an incidental function of the subdivision technology. The actual step angle at which the motor is running after subdivision is a fraction of the base step angle.
Infineon: Automotive electric power steering system
Modern automotive technology pursues three goals of high efficiency, high comfort and high safety. As one of the most important subsystems of automobiles, the development of steering systems has also been striving to achieve these goals. Compared with the traditional hydraulic power steering system (HPS), the electric power steering system (EPS) can save fuel consumption by about 3% to 5%. It has the advantages of compact structure, energy saving, safety and comfort, and is the development direction of the automobile power steering system.
As the world's second largest supplier of automotive semiconductors, Infineon has been developing new products to adapt to the development of electric power steering systems. This paper first introduces the market analysis of steering system and the classification of EPS and its basic functions. Then, based on this, it introduces Infineon's solutions for EPS systems based on two different motors and their products. Finally, this paper analyzes two EPSs. New directions and solutions and new product technologies that Infineon will adopt.
1. Steering system market analysis
In the development of the car, the steering body has gone through four stages: from the simple mechanical Steering (MS) to the Hydraulic Power Steering (HPS), and then the electro-hydraulic boost Electric Powered Hydraulic Steering (EHPS), and Electric Power Steering (EPS) is currently widely used.
Compared with the traditional hydraulic power steering system, the electric power steering system has the following advantages:
1) Low energy consumption: EPS does not have a steering pump, and the motor only provides power when steering, so power consumption and fuel consumption can be minimized. Compared with the hydraulic power steering system, it can save 3% to 5% of fuel, so the fuel economy has been greatly improved.
2) Good road feel: EPS can provide the best force under various driving conditions and reduce the disturbance to the steering system caused by road unevenness. And because the EPS system uses a rigid connection inside, the hysteresis characteristics of the system can be controlled by software, so there is a good road feel.
3) Convenient installation: EPS eliminates parts such as oil pumps, belts, seals, hydraulic hoses, hydraulic oil and seals, and its motor and speed reduction mechanism are mounted on the steering column or in the steering gear, thus making the entire steering system Light weight, compact structure and easy installation.
4) Good return performance: The EPS structure is simple and accurate, the internal resistance is small, the return performance is good, and it can be compensated by software, so that the optimal steering return characteristics can be obtained, and the steering stability of the vehicle can be improved.
5) Wide application range: EPS can be adapted to various automobiles, and is currently mainly used for cars and light trucks. For new energy vehicles, especially pure electric vehicles, the EPS system is the best choice.
6) Complete vehicle network construction: EPS has CAN/LIN network interface, which can be combined with other electronic control systems of automobiles, such as active suspension, brake anti-lock (ABS) and driver assistance system, etc., sharing its electronic devices. The ability to implement more complex functions, such as the ultimate goal of automotive intelligence: driverless.
Table 1 below shows the prediction of the global steering system by the world-famous consulting firm Strategy AnalyTIcs. It can be seen that EPS will occupy more than 50% of the market.
Table 1: 2007-2018 global steering system market forecast (million sets)
In terms of sub-regions, EPS has been used mainly in Europe, America and Japan. However, starting in 2015, China will surpass Europe, America and Japan to become the world's largest EPS market. See table 2 below.
Table 2: 2007-2017 global steering system market sub-regional forecast (million sets)
In terms of sub-models, all general-purpose passenger cars can use EPS, with an average annual growth rate of 15% from 2007 to 2017. However, due to the rapid growth in demand for EPS for large cars and light trucks, Table 3 shows from C The share of small cars below the grade dropped from 86% in 2007 to 66% in 2018.
Table 3: 2007-2018 Global Steering System Market Model Forecast (Million Sets)
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