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三相磁场定向控制FOC

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磁场定向控制(FOC)即矢量控制,是一种利用两个正交分量对三相交流感应电动机驱动定子进行变频控制的技术。一种定义定子产生的磁通量,另一种对应由电机转速决定的转矩,而电机转速由转子位置决定。
磁场定向控制FOC
磁场定向控制(FOC)
我们提供全系列的功率半导体元件和集成电路,包括分立式IGBT和功率MOSFET、以及电源模块智能电源模块(IPM)、高压栅极驱动器和功能强大的STM32微控制器,这些都是实现高效变频驱动(VFD)电机控制时所需要的。

为了帮助缩短和简化设计周期,我们提供完整的硬件生态系统 — 评估板和参考设计 — 以及各种固件和软件库。

    • 它们通常使用比例积分(PI)控制器,将电流分量与参考值进行比较,而不是使用脉宽调制(PWM)。这使得电动马达在全速范围内平稳运行,并在零速度下产生最大扭矩。磁场定向控制的另一个优点是可实现电机的快速加速和减速,对高性能电机进行更精确的控制。 随着用于FOC的空间矢量控制算法得到更有效的实现,低成本微控制器具有更强的处理能力,该技术亦可用于性能较低的感应电机驱动。随着控制器性能的提高,该技术有望取代标量电压/频率控制算法。
    • 传统的直接磁场定向控制(DFOC)算法在转矩控制方面的精度高于标量算法,但需要用于转子速度控制和磁通量的传感器为FOC算法提供数据。这种算法还在动态响应和对电机参数测量的依赖性方面面临挑战。 相反,间接磁场定向控制(IFOC)方法估计转子磁场通量的相位角,不需要额外的传感器,但增加了控制系统的复杂性和计算时间。
    • 完全取代FOC电机控制器中的传感器可以降低交流感应电机的成本并提高可靠性,但也增加了控制器的复杂性和成本。为了取代传感器,与转子速度有关的信息是通过电机端子从定子绕组的电压和电流中提取的。这些信息随后反馈到电机的电流控制元件。 利用寄生效应可以准确地确定低速时的动态性能和静态转速。可使用性能评测工具确定特定系统设计的性能,以构建一个可用于无传感器电机控制的模型。

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Our products and solutions

We offer the entire range of power semiconductors and ICs including discrete IGBTs and power MOSFETs as well as power modules and intelligent power modules (IPM), high-voltage gate drivers and powerful STM32 microcontrollers needed to implement high-efficiency variable-frequency drive (VFD) motor control. To help reduce and simplify the design cycle, we offer a complete ecosystem of hardware – evaluation boards and reference designs – as well as firmware and software libraries.

Advantages of Field-Oriented Control

Advantages of Field-Oriented Control

These typically use proportional-integral (PI) controllers where the current components are compared to reference values, rather than using pulse width modulation (PWM). This allows electric motors to operate smoothly over the full speed range and generate full torque at zero speed. Another benefit of field-oriented control is that it can deliver fast acceleration and deceleration of the motor, giving more accurate control in high performance motors. 

As the space vector control algorithms used for FOC are implemented more efficiently and low-cost microcontrollers have more processing power, the technique can be used for lower performance induction motor drives. As the performance of the controllers increases, the technique is expected to replace scalar volts/hertz control algorithms.

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Direct and Indirect Field-Oriented Control

Conventional direct field-oriented control (DFOC) algorithms provide more precision for torque control than scalar schemes, but require sensors for the speed control of the rotor and the magnetic flux to provide the data for the FOC algorithms. They also face challenges in the dynamic response and the dependence on measuring the parameters in the motor. 

Instead an indirect field-oriented control (IFOC) method estimates the phase angle of the rotor magnetic field flux, eliminating the need for additional sensors but adding to the complexity and the computation time of the control system.

Sensorless field-oriented control

Replacing the sensors entirely in an FOC motor controller reduces the cost and increases the reliability of an AC induction motor, but also increases the complexity and cost of the controller. To replace the sensor, the information on the rotor speed is extracted from the voltages and currents in the stator windings via the motor terminals. This is then fed back into the current control of the motor. 

The dynamic performance and steady-state speed can be determined accurately at low speeds using the parasitic effects. Profiling tools can be used to determine the performance of particular system designs to build a model that can be used for sensorless motor control. 

Applications 

FOC can be used across AC induction motors and brushless (BLDC) motors to improve the control and accuracy of the motors for a wide range of applications from pumps and fans to conveyors, particularly in industrial automation where long-term reliability is essential.

Picture Solution
Compact reference design for battery-operated brushless power tools (36V-72V)
SL-PTOOL2V1
批量生产
Compact reference design for battery-operated brushless power tools (36V-72V)
SL-PTOOL2V1
批量生产

All tools & software

    • 产品型号
      状态
      描述
      类型
      供应商

      STSW-POWERSTUDIO

      批量生产

      功率器件的ST PowerStudio动态电热模拟软件

      评估工具软件 ST
      STSW-POWERSTUDIO

      描述:

      功率器件的ST PowerStudio动态电热模拟软件
    • 产品型号
      状态
      描述
      类型
      供应商

      STSW-STM32100

      NRND

      STM32 PMSM FOC软件开发套件 - MC库(UM1052)

      STM32 固件 ST
      STSW-STM32100

      描述:

      STM32 PMSM FOC软件开发套件 - MC库(UM1052)

      X-CUBE-MCSDK

      批量生产

      STM32电机控制软件开发套件(MCSDK)

      STM32Cube扩展包 ST
      X-CUBE-MCSDK

      描述:

      STM32电机控制软件开发套件(MCSDK)

      X-CUBE-SPN11

      批量生产

      STM32Cube的低压三相无刷DC电机驱动器软件扩展

      STM32Cube扩展包 ST
      X-CUBE-SPN11

      描述:

      STM32Cube的低压三相无刷DC电机驱动器软件扩展

      X-CUBE-SPN16

      批量生产

      STM32Cube的三相电机驱动器软件扩展

      STM32Cube扩展包 ST
      X-CUBE-SPN16

      描述:

      STM32Cube的三相电机驱动器软件扩展

      X-CUBE-SPN17

      批量生产

      STM32Cube的低压三相无刷DC电机驱动器软件扩展

      STM32Cube扩展包 ST
      X-CUBE-SPN17

      描述:

      STM32Cube的低压三相无刷DC电机驱动器软件扩展

      X-CUBE-SPN7

      批量生产

      STM32Cube的三相无刷DC电机驱动器软件扩展

      STM32Cube扩展包 ST
      X-CUBE-SPN7

      描述:

      STM32Cube的三相无刷DC电机驱动器软件扩展

      X-CUBE-SPN8

      批量生产

      STM32Cube的低压BLDC电机驱动器软件扩展

      STM32Cube扩展包 ST
      X-CUBE-SPN8

      描述:

      STM32Cube的低压BLDC电机驱动器软件扩展