Field-Oriented Control(FOC): Learning and Matching

Discover the power of Field-Oriented Control (FOC) in motor technology! Dive into intelligent algorithms, self-learning motor matching, and precision PID simulation for optimal performance.

The advancement of BLDC motor technology is closely linked to the use of FOC (Field Oriented Control). FOC emerging as a hot topic in the field of motor control thanks to its intelligent algorithms and self-learning motor matching capabilities. This article introduces the key features of FOC technology, ranging from intelligent algorithms to automatic PID configuration and precision PID simulation algorithms, presenting a brief overview for the readers.

I. Overview of FOC Technology

FOC technology is an electromagnetic field-oriented control method aimed at enhancing the efficiency and performance of motors. Its core concept involves adjusting the motor current to align the electromagnetic field direction with the rotor axis, achieving precise motor control.

II. Intelligent Algorithms and Self-Learning Motor Matching

1. Entrance of Intelligent Algorithms:

FOC technology introduces intelligent algorithms that, by measuring the motor's state (such as current and position), adjust the motor's input intelligently to achieve better performance, simplifying and enhancing motor tuning. Notably, CJC's FOC technology can automatically match motors within a mere 10 seconds, adapting to different motor parameters through methods like line sequence (power, Hall, encoder), and phase learning.

2. Flexibility of Self-Learning Motor Matching:

FOC technology offers two modes of motor matching: sensorless (without feedback) and sensored (with feedback). In sensorless matching(a method of driving a motor without using a position sensor), users can connect the motor freely, avoiding damage caused by incorrect wiring. In other words, sensorless matching means that users do not need to pay too much attention to the problem of line sequence when connecting the motor, and the system will automatically adapt. This mode provides convenience to customers and reduces the potential risk of damage due to wiring errors. Instead, the motor's back electromotive force (EMF) is used to estimate the rotor position. This method has the advantage of being simpler and less expensive than using a position sensor. In sensored matching, FOC technology automatically configures Proportional-Integral-Derivative (PID) parameters, offering users a convenient and quick tuning experience while enhancing motor efficiency by optimizing control parameters based on real-time feedback.

III. Importance of Precision PID Simulation Algorithm

1. Auto-generating Optimal PID Parameters:

High bandwidth, fast response, stable and reliable

(only takes 0.08 seconds to respond from 0 to full speed step

FOC technology introduces a precision PID simulation algorithm capable of simulating different motor operating conditions and load situations, automatically generating optimal PID parameters. This means the system can evaluate various parameter combinations in a simulated environment to find the most suitable control parameters for the motor.

2. Visualization of PID Control Parameters:

Through FOC technology and the use of precise PID simulation algorithms, the visualization of PID control parameters is achieved. While FOC technology itself does not directly provide the visualization of PID parameters, CJC uses tools that enable users to monitor and analyze the motor's status graphically, including the impact of PID control parameters. This allows customers to intuitively monitor and analyze the motor's control status, providing a visual reference for debugging.

IV. Advantages and Future Applications of FOC Technology

CJC's comprehensive technical foundation of FOC technology makes it widely applicable in various types of motors, including single/dual/three-resistor motors. Its adaptability and flexibility stem from its weak magnetic control characteristics, effectively controlling the motor even in low-speed or light-load conditions, ensuring outstanding performance. This increases the applicability of the motor under different working conditions.

The all-encompassing FOC technology, with its intelligent algorithms, self-learning motor matching, and precision PID simulation algorithms, reshapes motor control and provides unmatched efficiency and ease of tuning.

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