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1. 发明授权

US4734634A Method and system for reconnecting inverter to rotating motors 失效
标题翻译：将变频器重新连接到旋转电机的方法和系统
公开(公告)号：US4734634A
公开(公告)日：1988-03-29
申请号：US938321
申请日：1986-11-28
申请人： Yasutami Kito , Kuniake Yasukawa
发明人： Yasutami Kito , Kuniake Yasukawa
IPC分类号： H02P1/30 , H02P3/18
CPC分类号： H02P29/025 , H02P1/30
摘要： When an inverter is disconnected from a rotating motor due to power failure or motor accident, it is necessary to connect the inverter power again to the rotating motor by the inertia force in order to keep the motor rotating. To achieve the above reconnection, the inverter is controlled in accordance with open-loop control method, without use of any motor speed detecting means, thus improving control response speed. In reconnection, the inverter is started at a frequency higher than the rotating motor speed and at a voltage lower than the rated value; when a predetermined time has elapsed after the starting voltage was applied to the motor, only the frequency is decreased; when inverter driving current drops below a predetermined value, the frequency is held and only the voltage is increased until the voltage-to-frequency ratio reaches a predetermined value.
摘要翻译：当变频器由于电源故障或电机故障而与旋转电机断开连接时，需要通过惯性力将变频器的电源再次连接到旋转电机，以保持电机的旋转。为了实现上述重新连接，逆变器根据开环控制方式进行控制，不使用任何电机速度检测装置，从而提高控制响应速度。在重新连接时，逆变器以比旋转电动机速度高的频率和低于额定值的电压起动; 当在起动电压施加到电动机之后经过预定时间时，仅频率降低; 当变频器驱动电流下降到预定值以下时，保持频率，并且只有电压增加直到电压 - 频率比达到预定值。

2. 发明授权

US4607205A Method and system for reconnecting inverter to rotating motors 失效
标题翻译：将变频器重新连接到旋转电机的方法和系统
公开(公告)号：US4607205A
公开(公告)日：1986-08-19
申请号：US661309
申请日：1984-10-16
申请人： Yasutami Kito , Kuniake Yasukawa
发明人： Yasutami Kito , Kuniake Yasukawa
IPC分类号： H02P3/18 , H02P1/26 , H02P1/30 , H02P23/06 , H02P27/06 , H02P27/08
CPC分类号： H02P27/08 , H02M7/53875 , H02P1/30 , H02P23/06 , H02P1/029
摘要： When an inverter is disconnected from a rotating motor due to power failure or motor accident, it is necessary to connect the inverter power again to the motor rotating by the inertia force in order to keep the motor rotating. To achieve the above reconnection, the inverter is controlled in accordance with the open-loop control method, without use of any motor speed detecting means, thus improving control response speed. In reconnection, the inverter is started at a frequency higher than the rotating motor speed and at a voltage lower than the rated value; only the frequency is decreased gradually but increased gradually again when the detected motor driving current reaches zero or the motor regenerated current starts flowing; and the voltage is raised when the detected motor regenerated current reaches its maximum value.
摘要翻译：当变频器由于电源故障或电机故障而与旋转电机断开连接时，需要再次将变频器的电源连接到通过惯性力旋转的电机，以保持电机的旋转。为了实现上述重新连接，逆变器根据开环控制方式进行控制，不使用任何电动机速度检测装置，从而提高控制响应速度。在重新连接时，逆变器以比旋转电动机速度高的频率和低于额定值的电压起动; 当检测到的电动机驱动电流达到零或电动机再生电流开始流动时，只有频率逐渐减小，但再次逐渐增加; 当检测到的电动机再生电流达到最大值时，电压升高。

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