Description: 无刷直流电机无位置传感器控制技术的研究(博士论文)无刷直流电动机利用电子换相代替机械换相，不但具有直流电动机的调速性能，而且体积小、效率高，在许多领域已得到了广泛应用。采用无位置传感器控制技术之后，不但克服了外置式位置传感器的诸多弊病，而且进一步拓宽了无刷直流电机的应用领域。目前，无刷直流电机无位置传感器控制已成为无刷直流电机控制技术的发展方向。 本文纵观了无刷直流电动机的兴起、发展与现状，概括了无刷直流电动机无位置传感器控制技术的现有水平及存在的问题，以研制、开发全直流变转速空调产品为依托，从理论和实践两个方面对这些问题展开了较为全面的研究和讨论。 (1)针对反电动势过零点检测方法和换相点检测方法中存在的不足，分别提出了“延迟90°-α换相”和“超前60°-γ换相”的方法。同时，本文提出的软件、硬件相结合的换相原理突破了单纯依靠硬件电路换相的局限性，拓宽了系统的调速范围，提高了系统的稳定性和可靠性。 (2)本文详细阐述了无刷直流电机控制系统中的换相转矩脉动问题，分析了造成换相转矩脉动的原因，通过理论推导，创造性地给出抑制换相转矩脉动的方法，并利用计算机仿真手段及实验对这种换相转矩脉动抑制方法进行了验证。-R&D on Sensorless Control Technology for Brushless DC Motor Brushless DC motor with permanent magnet excitation, in which electrical commutator is used instead of mechanical, has the same good characteristics of speed control as traditional DC motor. Brushless DC motors have found wide application due to their high power density and ease of control. Moreover, the machines have high efficiency over wide speed range. Platform: |
Size: 4206592 |
Author: |
Hits:
Description: 无叶电机 方案，可识别电机异常，过载，输入电源异常等，并在故障发生后进行相应的保护。如果可能，还可在异常恢复后，重新恢复工作。同时，还可增加红外遥控，数码管显示，液晶显示等人机交互界面。可实现自然风，定时功能，预约，智能控制等功能。
主要应用的无叶风扇参数：
输入电压：220AC
电机：310VDC，8200RPM，45W、直流无刷无传感器控制方案
为精确控制电机转速，通常需要在直流无刷电机上增加位置传感器（例如：霍尔传感器）。控制器根据传感的信号，进行相应的控制，以平稳驱动电机运行。同时，可根据外部电位器、键盘、温度传感器等输入设备，调节电机的转速，达到更加舒适，更加节能的目的。同时，控制器在识别到传感器损坏后，可自动切换为无传感器方式运行，更加安全可靠。
泽兆科技是富士通代理商并专注于无刷电机驱动开发，0755-29364006-Sensorless brushless DC control scheme
Two leaf motor motor program can identify abnormal motor, overload, input power anomalies, and failure to carry out appropriate protection. If possible, also in abnormal recovery and resumed work. The same time, you can increase the infrared remote control, digital display, LCD, interactive interface. Can achieve the natural wind, timer function, make an appointment, intelligent control and other functions.
No leaves fans parameter:
Input voltage: 220AC
Motor: 310VDC, 8200RPM, 45W, DC brushless sensorless control scheme
Usually increase in the brushless DC motor for precise control of motor speed, position sensor (for example: Hall sensors). The controller according to the sensor signal, the corresponding control run as smooth drive motor. At the same time, according to an external potentiometer, keyboard, temperature sensors and other input devices, adjust the motor speed to achieve a more comfortable, more energy-efficient purpos Platform: |
Size: 151552 |
Author: |
Hits:
Description: Direct Torque and Indirect Flux Control
of Brushless DC MotorAbstract—Inthis paper, the position-sensorless direct torque and
indirect flux control of brushless dc (BLDC) motor with nonsinusoidal
back electromotive force (EMF) has been extensively investigated.
In the literature, several methods have been proposed for
BLDC motor drives to obtain optimum current and torque control
with minimum torque pulsations. Most methods are complicated
and do not consider the stator flux linkage control, therefore, possible
high-speed operations are not feasible Platform: |
Size: 322560 |
Author:md adil |
Hits:
Description: 无刷直流电动机利用电子换相代替机械换相，不但具有直流电动机的调速性能，而且体积小、效率高，在许多领域已得到了广泛应用。采用无位置传感器控制技术之后，不但克服了外置式位置传感器的诸多弊病，而且进一步拓宽了无刷直流电机的应用领域。目前，无刷直流电机无位置传感器控制已成为无刷直流电机控制技术的发展方向。 本文纵观了无刷直流电动机的兴起、发展与现状，概括了无刷直流电动机无位置传感器控制技术的现有水平及存在的问题，以研制、开发全直流变转速空调产品为依托，从理论和实践两个方面对这些问题展开了较为全面的研究和讨论。 (1)针对反电动势过零点检测方法和换相点检测方法中存在的不足，分别提出了“延迟90°-α换相”和“超前60°-γ换相”的方法。同时，本文提出的软件、硬件相结合的换相原理突破了单纯依靠硬件电路换相的局限性，拓宽了系统的调速范围，提高了系统的稳定性和可靠性。 (2)本文详细阐述了无刷直流电机控制系统中的换相转矩脉动问题，分析了造成换相转矩脉动的原因，通过理论推导，创造性地给出抑制换相转矩脉动的方法，并利用计算机仿真手段及实验对这种换相转矩脉动抑制方法进行了验证。-Brushless DC motor with permanent magnet excitation, in which electrical commutator is used instead of mechanical, has the same good characteristics of speed control as traditional DC motor. Brushless DC motors have found wide application due to their high power density and ease of control. Moreover, the machines have high efficiency over wide speed range. Platform: |
Size: 3854336 |
Author:wangfan |
Hits:
Description: We propose a position sensorless control scheme for a four-switch, three-phase brushless DC motor drive, based on
the zero crossing point detection of phase back-EMF voltages using newly defined error functions (EFs). The commutation instants
are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than phase or line
voltages so that the sensorless control can work at a lower speed range. Moreover, EFs have smooth transitions around zero
voltage level that reduces the commutation errors. EFs are derived the filtered terminal voltages vao and vbo of two low-pass
filters, which are used to eliminate high frequency noises for calculation of the average terminal voltages. The feasibility of the
proposed sensorless control is demonstrated by simulation and experimental results.-We propose a position sensorless control scheme for a four-switch, three-phase brushless DC motor drive, based on
the zero crossing point detection of phase back-EMF voltages using newly defined error functions (EFs). The commutation instants
are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than phase or line
voltages so that the sensorless control can work at a lower speed range. Moreover, EFs have smooth transitions around zero
voltage level that reduces the commutation errors. EFs are derived the filtered terminal voltages vao and vbo of two low-pass
filters, which are used to eliminate high frequency noises for calculation of the average terminal voltages. The feasibility of the
proposed sensorless control is demonstrated by simulation and experimental results. Platform: |
Size: 413696 |
Author:ali |
Hits:
Description: Robust sensorless commutation control.
External speed reference.
Overcurrent detection/protection.
Basic speed controller included.
Full source code in C.
Source code can be adapted to a new motor by changing parameters.
Several I/O pins/peripherals not used for motor control. Can be used for other
purposes, such as status LEDs, communication or user input.
Works without modification on the pin and source code compatible devices
ATmega48, ATmega88 and ATmega168.(This application note describes how to
implement sensorless commutation control
of a 3-phase brushless DC (BLDC) motor with the low cost ATmega48
microcontroller. A general solution, suitable for most 3-phase BLDC motors on the
market is presented. The full source code is
written in the C language, no assembly
is required. Adaptation to different motors
is done through the setting of parameters
in the source code.) Platform: |
Size: 82944 |
Author:maria123456
|
Hits:
Search - speed control for sensorless brushless motor