开关磁阻电机在抽油机、龙门刨床等需要正反转切换的场合下,若导通与关断相绕组选择不合适,不仅无法正常切换,而且有可能因为电流过大,损坏功率器件。针对该问题,给出了基于DSP控制的开关磁阻电机正反转切换的设计方案,分析了正反转中G...开关磁阻电机在抽油机、龙门刨床等需要正反转切换的场合下,若导通与关断相绕组选择不合适,不仅无法正常切换,而且有可能因为电流过大,损坏功率器件。针对该问题,给出了基于DSP控制的开关磁阻电机正反转切换的设计方案,分析了正反转中GPIO位置检测和CAP捕获模块中位置逻辑信号的不同。通过光电开关管传来的6路位置信号,结合PWM斩波技术,进行相应相绕组的通电、断电操作,不仅能使开关磁阻电机转子在任意位置具有自起能力,而且在给出正反转切换指令后,通过改变PWM占空比,从而可以调节正反转切换的快速性。以一台3 k W 12/8开关磁阻电机为研究对象,通过实验验证了方法的有效性和可靠性。展开更多
Theory has it that increasing the step length improves the accuracy of a method. In order to affirm this we increased the step length of the concept in [1] by one to get k = 5. The technique of collocation and interpo...Theory has it that increasing the step length improves the accuracy of a method. In order to affirm this we increased the step length of the concept in [1] by one to get k = 5. The technique of collocation and interpolation of the power series approximate solution at some selected grid points is considered so as to generate continuous linear multistep methods with constant step sizes. Two, three and four interpolation points are considered to generate the continuous predictor-corrector methods which are implemented in block method respectively. The proposed methods when tested on some numerical examples performed more efficiently than those of [1]. Interestingly the concept of self starting [2] and that of constant order are reaffirmed in our new methods.展开更多
文摘开关磁阻电机在抽油机、龙门刨床等需要正反转切换的场合下,若导通与关断相绕组选择不合适,不仅无法正常切换,而且有可能因为电流过大,损坏功率器件。针对该问题,给出了基于DSP控制的开关磁阻电机正反转切换的设计方案,分析了正反转中GPIO位置检测和CAP捕获模块中位置逻辑信号的不同。通过光电开关管传来的6路位置信号,结合PWM斩波技术,进行相应相绕组的通电、断电操作,不仅能使开关磁阻电机转子在任意位置具有自起能力,而且在给出正反转切换指令后,通过改变PWM占空比,从而可以调节正反转切换的快速性。以一台3 k W 12/8开关磁阻电机为研究对象,通过实验验证了方法的有效性和可靠性。
文摘Theory has it that increasing the step length improves the accuracy of a method. In order to affirm this we increased the step length of the concept in [1] by one to get k = 5. The technique of collocation and interpolation of the power series approximate solution at some selected grid points is considered so as to generate continuous linear multistep methods with constant step sizes. Two, three and four interpolation points are considered to generate the continuous predictor-corrector methods which are implemented in block method respectively. The proposed methods when tested on some numerical examples performed more efficiently than those of [1]. Interestingly the concept of self starting [2] and that of constant order are reaffirmed in our new methods.
